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pent haus garden room kit contents laid out ready to build

August 11 2026

First-Time Buyer’s Guide to Self-Build Garden Room Kits

penthaus Blog Post examples of a Garden Room, Garden Home Office, Garden Room Ideas, Garden Room Inspiration, Garden Room Interior, Garden room interior examples, home gym, home office, Insulated Garden Office, Multifunctional Garden Room, Should I build a Garden Office?

Choosing a kit to construct your garden room for the very first time can be quite thrilling, but at the same time, it can also be quite daunting because of the wide range of possibilities in the market. Each decision that you make, right from building techniques to insulation level and cost, will influence the performance of your garden room. There are some important things to know before purchasing your kit.

How to self-build your own dream Garden Room

Start by Understanding the Different Kit Types

All garden room kit models are not made equal. First off, you need to make a comparison of how the structures are constructed since this affects their durability, insulation, assembling process, and maintenance.

1. Compare the Main Construction Options

A log cabin kit gives you a traditional look, and it can be easily assembled because of the use of interconnected timber blocks. However, it will need frequent maintenance to ensure the wood remains safe from weathering.

SIP kits will give you great insulating properties, and they will suit your needs in case you want the garden room to be used during all seasons. It is simple to put them together because they are both light and strong.

Timber frame kits provide you with much more flexibility but also mean additional work, such as insulating, making it waterproof, and covering the exterior.

If you are considering DIY garden rooms in the UK, then this will be the best way to choose the proper construction style.

Know Exactly What’s Included

A garden room kit may appear affordable until you discover that several essential components are sold separately. Always review the specification before making a purchase.

2. Check the Complete Kit Contents

The supplier may supply all the required materials for the construction of the basic structure or just the framework. The materials should contain:

Windows and external doors
Roofing materials
Floor system and structural supports
Internal insulation
Exterior cladding
Fixings and assembly instructions

This will make it much easier to compare prices when dealing with different suppliers.

Focus on Year-Round Comfort

If you are planning on making use of your garden room for more than an occasional purpose, insulation needs to be high up on the list.

3. Prioritise Insulation and Glazing

This insulation keeps the garden room warm in any season and saves the costs of heating for the future. It is important to make sure whether the insulation is already included in the package or not, and whether it should be purchased additionally.

The installation of double-glazed glass is no less important. The glazed windows make your room more energy-efficient, make you live without outside noise, and keep the room at one temperature.

Don’t Overlook the Foundation

Even the best quality garden room kit will work poorly when it is installed on the wrong base.

4. Choose the Right Foundation

The foundation must be even, firm, and proper for your particular garden circumstances. The different types of foundations include concrete slabs, ground screws, or piles, based on where you decide to erect the structure.

Ground screws are normally installed more quickly than concrete slabs, although concrete is usually more suitable for large structures. It is very important to choose the right foundation from the start to avoid future structural shifting.

Understand Planning Requirements Early

Many buyers assume planning permission is always necessary, but that’s not always the case.

5. Check Local Building Requirements

Many garden rooms fall within permitted development rules if they meet specific height and usage limits. However, requirements can vary depending on your property and intended use.

Before buying the kit, make sure that the proposed construction meets the local requirements. This will help save your time in case of delays in the process of construction.

4.2m x 3.0m ToughFrame Pro Building Pent Haus Garden Room clad in ToughWood 'Cedar'

Budget Beyond the Purchase Price

The kit cost does not cover the whole budget required for the project.

6. Plan for Hidden Expenses

First-time buyers should also budget for additional costs such as the following:

Electrical installation
Foundation preparation
Interior finishes
Lighting and heating
Delivery charges
Professional assistance where needed

Looking at these costs in advance is much more realistic when it comes to gauging your total cost.

When you are looking at different garden rooms for self-build in the UK, going beyond the price tag can sometimes help you find out which one will give you better value for your money.

Be Honest About Your DIY Experience

The garden room kits are easy to assemble at home, but not every kit requires the same level of skill.

7. Assess the Assembly Process

While some prefabricated kits come with precut components that are well labeled to make installation easy, other kits need some carpentry expertise. Large panels of walls and roofs, as well as windows, may be heavy too, and working with one or two assistants is more efficient and safer. Reading up on the assembly instructions before purchasing will give you an accurate idea of what needs to be done.

Compare Supplier Support and Warranty

The quality of customer support can be just as valuable as the quality of the materials.

8. Look Beyond the Product

Select a supplier who will give you proper installation instructions, good customer service, and a warranty on the structures. Reading independent customer reviews will assist you in determining the level of support that a supplier offers customers after delivery.

A supplier who will guide you well through the entire process ends up creating a more enjoyable experience for you as a new customer.

Read our 5 star Trustpilot Reviews

Make Your First Purchase with Confidence

Deciding on which garden room kit you want to choose should go beyond price. Factors such as construction process, insulation, supplied materials, need for foundations, building laws, and costs of the whole construction project will play an important part in helping you make an educated decision. Evaluating all these factors is crucial for choosing the right garden room kit for yourself.

In selecting between various suppliers, take into consideration such aspects as build quality, specification, installation support, warranties, and long-lasting performance.

There is no better supplier than Pent Haus because our products meet a wide variety of requirements.

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July 7 2026

Can You Use A Garden Room All Year Round?

It’s a question we get asked a lot – can you use a garden room all year round? After all, you want to make sure that your investment is going to be worth it, especially if you’re opting to use your garden room every day as an office or studio.

The fantastic news is that the answer is a resounding yes! With careful consideration around insulation, heaters, ventilation and glazing, you can definitely have an all-season garden room that’s available for use 365 days of the year.

Summer: making the most of the light – without overheating

Ensuring your garden room can be used on hot days is a must, especially with climate change elevating UK summer temperatures. This is where you need to consider glazing, shading options and air flow around the room to avoid your garden room becoming a large greenhouse that’s too hot to enjoy properly.

Some thoughtful design touches will really make a difference. Think about the position of your windows – ensure there’s a cross-ventilation so hot air can escape, and if possible, make them north rather than south facing. If they are south facing, consider adding a roof overhang, canopy or larch batten sunshades. For solar control, blinds or curtains will help block out the sun on super hot days. Reflective solar film is also an option.

Managing moisture levels is key. This is particularly important if you’re using your garden room as a gym or exercise space, or plan to install a bathroom. Ensure your garden room includes trickle vents on windows and/or doors and if this isn’t enough to control moisture levels, you might want to consider a fan, either a simple extractor fan or a single room heat recovery fan that helps with temperature levels. A dehumidifier is also an option.

Also, that insulation you added to your garden room so you can use it in the winter? It will also help external heat from coming in, making it more bearable on super hot days.

Start designing your garden room

Winter: the real test of insulation and heating

Winter is the season when your garden room is really put to the test – after all, no one wants to be shivering while working, or unable to access the room for three months of the year.

So, are garden rooms warm in winter? The answer lies in heating and insulation – without these, your garden room just turns into a glorified shed!

The good news is that garden rooms come with a variety of heating options. Electric radiators are always a popular choice, with a wall-mounted version offering neatness and preserving precious floor space.

Another option is an infrared panel heater. Rather than heating the air, this radiates warmth directly to people and objects. The advantage for a garden room is that infrared panel heaters don’t take up much space, can be easily controlled and work well in a small area. You can mount them on the ceiling, too, which also helps free up floor and wall space. Or for the ultimate in luxury, you could consider underfloor heating.

Any type of heating needs to be considered when designing your garden room, and ensuring that the right electrics have been installed to support it.

Working in tandem with your heater is the need to have proper insulation, to keep that precious heat inside the garden room. And insulation isn’t just for the walls – don’t forget to include the ceiling and the floor. The added bonus is that decent insulation will help with moisture levels too, which will play a big part in preserving the fabric of your garden room.

Decent glazing is also important to keep heat inside. Double or triple glazing will ensure heat stays where it needs to be, rather than leaking through the glass.

4.8m x 3.2m Signature SIPs Pent Haus Garden Room in ToughWood 'Silver Birch'

Spring and Autumn: weather proofing and ventilation

The shoulder seasons of Spring and Autumn can also bring their challenges for garden rooms. Sunshine and rain require ventilation management, which is where those trickle vents come into play.

As the cooler weather and autumnal rains come in, making sure the outside is properly weather proofed will help your garden room maintain its appearance as well as being warm and dry inside. Depending on the material of your garden room panels, you may need to weatherproof it each year with an oil or a stain, or opt for a material that’s resistant to heat and water, such as the ToughWoodⓇ that Pent Haus garden rooms are clad in.

Plan your dream garden room with our online design tool.

What To Look For When Choosing A Year-Round Garden Room

Insulation rating

Insulation will help keep your garden room warm in winter as well as cool in summer, so it’s vital your year-round garden room has it. Check the specification of the insulation and whether it’s enough for the temperature range you experience.

Glazing specification

The thickness of your windows and doors will play an important part in helping use your garden room year round. We advise double glazing as a minimum to ensure heat is retained, with the added bonus that it will block out any external sounds such as traffic.

Heating

Heating is a must in the UK climate if you want to use your garden room year-round. You’ll therefore need to make sure you put in the right electrics to support the type of heating you want, as well as everything else you need power for. Our Garden Rooms Electric Guide has lots of practical information on everything you need to know about installing electrics.

Roofing

You’ll need to make sure the roof on your garden room can cope with all the rain the UK climate throws at it! Think about the pitch, the materials and the drainage.

Warranty

Check whether your garden room comes with a warranty to cover any damage to the fabric of the building, whether this is from the weather or any other wear and tear.

Garden Rooms Built for Every Season

If you’re looking for a garden room that you can enjoy come rain, sunshine or snow, we offer an extensive range of ready-to-go kits as well as custom-made garden rooms.

All of our all-season garden rooms come with uPVC double glazing as standard, plus a 10 year structural warranty. Our ToughFrame™, ToughFrame Pro™ & SignatureSIPs™ kits all offer highly efficient thermal values and exceptional strength, making our garden rooms warm in the winter and cool in the summer. Premium insulation in walls, floor and ceiling comes as standard in our ToughFrame Pro™ & SignatureSIPs™ kits.

The roofs of our garden rooms are also insulated, with a slight slope from front to back, allowing water to run off efficiently to the rear guttering system and downpipe. We provide 4” wide guttering as standard to manage the flow of water from the roof and away from your garden room.

Our patented SignatureSIPs™ kit features pre-cut wiring channels that are concealed within the walls and ceiling for high-speed electrics – perfect for adding heating to your garden room.

If this sounds like the kind of year-round garden room you’re after, please get in touch to discuss your requirements!

Signature SIPS Pent Haus Garden Room BBQ Social Gathering

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5.4m x 3m Building - ToughFrame Pro Pent Haus Garden Room in ToughWood 'Granite'

July 6 2026

How Much Does A Garden Room Cost In The UK?

Search “how much does a garden room cost” and you will find a wide range of figures, often with very little explanation of what sits behind them. One site quotes £10,000, another says £50,000, and you are left none the wiser about where your project might actually land.

The honest answer is that garden room costs vary considerably. Size, specification, materials, and what you choose to include all have a significant bearing on the final figure. What matters is understanding what drives those differences, so you can compare options properly and budget with confidence.

This guide breaks it down clearly, with no vague ranges and no small print.

Garden Room Costs At A Glance

Pent Haus garden rooms start from £6,129.47 for a kit, with the total cost depending on the size, structure type, and any additional options you choose to include.

To give you a useful starting point, here is how the main variables break down:

Structure type: Pent Haus kits are available in three structure types:

ToughFrame
ToughFrame Pro
SignatureSIPs

Each offers different levels of specification and thermal performance to suit different budgets and requirements.

Size: Rooms are available across a range of depths (2.6m, 3.2m, and 3.8m) and widths (3m, 3.6m, 4.2m, 4.8m, and 5.4m), giving you a broad choice of footprints depending on your garden and intended use.

Optional extras: Foundations, electrics, internal panelling, and flooring are available as add-ons, so you only pay for what you need.

Browse our Project Gallery to see how our SignatureSIPs, ToughFrame Pro, and ToughFrame garden rooms look in real gardens.

Size: How Dimensions Affect The Overall Cost

As a general rule, the larger the room, the higher the cost. Size also determines how useful the space actually is day to day, so it is worth thinking carefully about what you genuinely need rather than defaulting to the smallest option to keep costs down.

A compact room at 2.6m x 3m works well as a focused home office or a quiet retreat. Step up to a 3.8m x 4.8m or larger and you have a space that can comfortably serve as a studio, gym, treatment room, or multi-purpose room that earns its keep in multiple ways.

One practical note for ToughFrame builds: the depth is reduced by 20cm compared to the stated dimensions, which is worth factoring in when planning your layout.

4.8m x 4.4m Signature SIPs Pent Haus Garden Office & Gym in ToughWood 'Granite'

Spec and Materials: Where The Real Cost Differences Live

Not all garden rooms are built the same way, and the specification of the structure is where the most significant cost differences tend to sit. It is also where the most important differences in quality are found.

Pent Haus kits are constructed using ToughWood, a sustainably sourced wood composite manufactured from wood strands compressed under extremely high pressure. It looks like timber but has none of the maintenance drawbacks of natural wood; no warping, no rotting, and no need for regular treatment. It is also a more ecologically responsible choice than PVC or composite cladding.

All three Pent Haus structure types offer strong thermal values and solid sound insulation. The SignatureSIPs kit goes a step further, featuring pre-cut concealed wiring channels within the walls and ceiling for a smooth interior finish and straightforward electrical installation.

On the roof, all kits come with highly durable EPDM rubber covering and a rear guttering system as standard.

If you have any questions, please take the time to read through our FAQs, designed to answer any queries you may have.

The Extras People Forget To Budget For

The kit price is your starting point, not your finishing point. Most buyers will also need to budget for some or all of the following:

Foundation pack, from £450. Every garden room needs a solid, level base. Pent Haus offers a foundation pack to take the guesswork out of it.

Electrical pack, from £310. If you are using your garden room as a home office, gym, or studio, you will almost certainly want power and lighting. This is rarely something to skimp on.

Internal panel pack, from £660. Pent Haus kits come ready for you to finish internally, with CNC-cut tongue and groove wood panelling available primed and ready to paint.

Flooring, from £234. A finished floor makes a significant difference to how the space feels and functions day to day.

Is A Garden Room Worth The Money?

It depends on what you are comparing it to.

Against renting a desk in a coworking space, a garden room typically pays for itself within a few years. Against the cost of a traditional extension, a garden room delivers a comparable quality of usable space at a fraction of the outlay and in a fraction of the time.

The key word throughout is quality. A poorly specified garden room that is cold in winter, damp by autumn, and tired within a few years will not deliver that return. A well-built one, specified properly from the start, will.

3.6m x 3.8m Signature SIPs Pent Haus Garden Room in ToughWood 'Weathered Oak'

Get A No-Surprises Quote From Pent Haus

Garden rooms start from £6,129.47, with a full range of sizes, structure types, and optional extras to suit your space and your budget. No hidden costs, no vague estimates; just a clear price for a well-built room you will use every day.

Self Build Kits

For those who prefer complete control over their project without the delay of traditional quoting, our online configurator allows you to design and cost your space in real time.

This tool provides a clear path to customisation; you can tailor the layout of doors and windows, choose your preferred cladding shade, and select a roof style, with the price updating instantly as you make each decision.

The tool also includes essential add-ons such as foundation kits, electrical installations, internal wood panelling, and oak laminate flooring, ensuring your budget accounts for a finished space.

Starting from £6,129.47, final costs scale transparently based on your chosen dimensions and specification. Once your configuration is complete, you can save your quote for later or schedule a consultation for expert advice before proceeding.

Completed Installed Kit

If you want to take the guesswork out of the design process, Pent Haus offers a range of pre-designed, ready-to-go garden room kits that you can purchase straight away; with only a small deposit required upfront.

Each kit includes doors and windows as standard, so you know exactly what you’re getting before you buy. It’s a great option if you want a clear, fixed cost without going through a full bespoke design process.

Delivery Cost

Another essential element of your budget is delivery. Pent Haus maintains a transparent, location-based approach to transport fees, ensuring there are no surprises at checkout. For much of England and Wales, delivery is completely free. We recommend reviewing the delivery rate map early on to identify your specific zone and lock in an accurate final figure.

4.2m x 3.8m ToughFrame Pent Haus Garden Room in ToughWood 'Cedar'

At Pent Haus, we build garden rooms designed to be used every day, in every season. If you are ready to explore what is possible for your space, please contact us! We would love to help.

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June 30 2026

The Garden Oasis Office: A Bespoke 2m x 3m Workspace

penthaus Case Study DIY Garden Room, Garden Room, Garden Room Ideas, Self-Build Garden Room

The Garden Oasis Office: A Bespoke 2m x 3m Workspace

Having recently relocated to care for her mother, Gemma needed more than just a place to put a desk. She needed a dedicated office retreat—a quiet, private sanctuary steps from the main house where she could focus on work while remaining close to family.

To maximise her compact outdoor space, we designed and built a bespoke 2m x 3m Signature SIPs Garden Studio. It proves that you don’t need a massive garden to create a highly functional, premium workspace.

Video Walkthrough: Step Inside Gemma’s Studio

See how the compact design looks in reality, explore the premium finishes, and hear more about the build process in our project showcase video:

👉 Watch the Full Garden Tour on YouTube

The Design: Maximising Light in a Compact Footprint

When working with a 2m x 3m footprint, smart architectural choices make all the difference. We focused on flooding the room with natural light to make the space feel open, airy, and inviting:

Upgraded Glazing: We installed sleek 1.8m French doors, custom-upgraded with dual 400mm side windows to capture every drop of daylight.
Premium Exterior: The studio is clad in our signature ToughWood ‘Cedar’. It delivers the striking, warm look of natural timber but offers long-lasting durability with virtually zero maintenance.
Modern Accents: The roof trimmings, window frames, and doors are finished in a contemporary Anthracite Grey, creating a sharp, stylish contrast against the cedar.

The Tech: Fully Equipped for Seamless Remote Work

A true garden office needs to perform just like a premium indoor room. We fully kitted out the Astana to ensure Gemma had commercial-grade connectivity and comfort:

Hardwired Connectivity: To guarantee uninterrupted Zoom calls and lightning-fast speeds, we ran a dedicated Cat 5 internet cable directly from the studio to the main house router.
Abundant Power: Four strategically placed double plug sockets ensure all computer hardware, monitors, and chargers are easily accommodated without messy extension cords.
Climate Control: To make it a true 365-day space, we installed luxury electric underfloor heating controlled by a precise digital thermostat.
Ambience: A stylish architectural up/down exterior light was added, providing both safety and a beautiful evening glow after dusk.

The Result: A Perfect Work-Life Balance

By taking her work out of the spare bedroom and into the garden, Gemma achieved the clear boundary she desperately needed. The Pent Haus has provided her with the peace, quiet, and independence to succeed at work, while flawlessly supporting her family life.

Project Specifications

Feature	Details
Model & Dimensions	Signature SIPs studio with Astana roof (2m x 3m)
Glazing Upgrade	1.8m French Doors + twin 400mm side windows
Heating	Digital Electric Underfloor Heating
Connectivity	Direct Cat 5 Data Cable Line

Ready to create your own dream garden room?

Visit our website for design inspiration, pricing, and to start your project consultation!

Start creating

June 30 2026

The Ultimate Work-From-Home & Weekend Entertaining Hub

penthaus Case Study DIY Garden Room, Garden Room, Garden Room Ideas, Self-Build Garden Room

The Ultimate Work-From-Home & Weekend Entertaining Hub

When our client, Kirk, approached us, he had a classic modern dilemma: he needed a dedicated, quiet space to work from home, a vibrant zone for weekend entertaining, and a hidden spot to tuck away garden clutter. The catch? It all had to fit beautifully into his existing outdoor setup, complementing his hot tub and alfresco dining area.

Our solution was a bespoke, dual-purpose 5.4m x 3m Signature SIPs Garden Room that seamlessly bridges the gap between productivity and relaxation.

The Exterior: Premium Style Meets Seamless Integration

To ensure the new building felt like a natural extension of the garden rather than an afterthought, we focused heavily on material matching and architectural details:

The Cladding: Finished in durable ToughWood with a rich Cedar finish, perfectly mirroring the existing timber features of the garden.
The Overhang: Features three integrated LED downlighters, casting a warm glow over the deck and ensuring the space is safe and welcoming across all seasons.
The Contrast: All doors and windows feature a modern Anthracite Grey exterior to contrast with the warm cedar, opening up to clean, bright white interiors.

The Layout: Three Rooms in One

The magic of this build is how much functionality is packed into a 16.2-square-meter footprint. By splitting the floor plan, we created distinct zones that cater to every hour of the day.

1. The Light-Filled Garden Office & Games Lounge

Striking the right balance between natural and artificial light is crucial for a comfortable workspace.

Daylight: A stunning 2.4m Bi-fold door completely opens up the front of the room to the dining patio, while a side 600mm full-length picture window frames views of the garden.
Lighting & Power: Inside, dimmable LED spotlights let Kirk shift the mood from bright “work mode” to relaxed “evening lounge mode.” Four double plug sockets were strategically placed in the corners to allow total flexibility for desk and media layouts.
Comfort: A wall-mounted heater keeps the space cosy 365 days a year—complete with a dedicated spot for the family dog!

2. The Hidden Storage Vault

To keep the main entertaining area completely clutter-free, we integrated a clever storage section on the side. Accessed via a solid 800mm secure door, this separate zone features its own internal power point—ideal for keeping garden tools, cushions, and utilities organised but instantly accessible.

The Finishes

Inside, the room boasts a crisp, contemporary aesthetic designed to maximise the feeling of space:

Premium wood-panelled walls finished with two coats of clean white emulsion.
Hard-wearing, stylish laminate flooring designed to withstand high foot traffic from both the garden and the hot tub area.

Project Specifications

Feature	Details
Dimensions	5.4m x 3m (Main room + integrated storage)
Model & Style	Abri with integrated roof overhang
Glazing	2.4m Bi-fold doors + 600mm side picture window
Exterior Finish	ToughWood Cladding in Natural Cedar

Ready to create your own dream garden room?

Visit our website for design inspiration, pricing, and to start your project consultation!

Start creating

Drone footage of Pent Haus garden room in large garden with house

June 29 2026

Garden Room Vs. Extension: Which Adds More Value To Your Home?

Everything You Need To Know…

A self-build garden room is an easy, budget friendly, and beautiful way to expand your living space. Whether you’re creating a home office, a home gym, guest room, or a creative studio it’s a great way to reach the full potential of your outdoor space. Our wide range of self-build garden rooms are easy and quick to assemble thanks to our easy installation panel design, and are fully insulated garden rooms, meaning you can use them all year round. Plus, usually you don’t need planning permission so you could have your dream garden room in less than 4 weeks!

Adding electricity to your garden room can give you limitless possibilities for your space, but it’s important to understand what you need and spend some time planning.

The Cost Comparison

A traditional single-storey extension in the UK typically costs anywhere between £30,000 and £80,000, depending on size, location, and specification. In London and the South East, that figure can climb even higher. This is before you factor in architect fees, structural surveys, planning applications, and the inevitable contingency budget for what gets uncovered once the builders are in.

A garden room, by comparison, typically sits between £6,000 and £40,000 for a quality, fully insulated build with electrics included. At Pent Haus, our rooms are designed and built to a specification which means they work as intended all year round, not just in the summer months.

The Hidden Costs Of An Extension

The headline build cost is only part of pricing up an extension. Most homeowners going through an extension project will also need to budget for:

Planning permission applications (typically £200 to £500, plus the time and uncertainty that comes with waiting for approval)
Architect or architectural designer fees, which can add 10-15% on top of the build cost
Temporary accommodation or storage if the work affects a significant part of the home
Redecoration and finishing once the builders have left, which is rarely included in the original quote.

What’s Included with a Garden Room

A garden room installation is a far more contained process. There are no structural surveys, no party wall agreements, and in most cases no planning permission required at all. The price you are quoted is much closer to the price you pay.

It is also worth noting that a garden room does not eat into your existing living space during the build. Pent Haus installations are completed within a matter of days, with minimal disruption to daily life.

If you have any questions, please take the time to read through our FAQs, designed to answer any queries you may have.

How Long Does Each One Take To Build?

A typical single-storey extension will take anywhere between three and six months from breaking ground to completion. Factor in the time spent finding and appointing an architect, waiting for planning permission, getting quotes from builders, and you are realistically looking at the best part of a year from decision to completion. That is assuming everything runs to schedule!.

The Reality Of Living Through An Extension

It is worth being honest about what that timeline actually looks like from the inside. For several months, your home becomes a building site. If the work is significant enough, some families choose to move out temporarily, which adds cost and disruption on top of everything else.

4.8m x 2.4m ToughFrame Pent Haus Garden Room Office Doors Open next to house

How Long Does A Garden Room Take?

A Pent Haus garden room follows a very different timeline. Once your order is confirmed and the base is prepared, most installations are completed in 3 days. The structure arrives ready to build, and by the end of the week you have a finished, usable space.

From your initial enquiry to the moment you unlock the door for the first time, the typical Pent Haus journey takes around four to eight weeks. There is no planning permission delay to wait on in most cases, and no sequence of different contractors to coordinate.

Want some inspiration? Check out our garden room ideas!

Planning Permission Questions

For a lot of people, planning permission is the part of any building project that feels the most out of their hands. You submit an application, and then you wait (sometimes for weeks) to find out whether you can proceed. For extensions, that uncertainty is almost always part of the process.

Extensions and Planning Permission

The majority of single-storey extensions require full planning permission, particularly if they extend beyond the rear of the property by more than three metres for a terraced or semi-detached home, or four metres for a detached. Larger projects, side extensions, and anything that affects the roofline will almost certainly need an application regardless of property type.

While the process itself is not complicated, it takes time and carries no guarantees. Local authorities can request amendments, impose conditions, or in some cases refuse permission.

Garden Rooms and Permitted Development

Our garden rooms are designed with permitted development rules built into the process from the start. We have a full guide to planning permission that walks through exactly what applies to your situation, so you are never left guessing.

4.2m x 3.8m Signature SIPs Pent Haus Garden Room in ToughWood 'Granite'

Which Adds More Value to Your Property?

A well-built extension will almost always add value to a property. Adding a bedroom, a larger kitchen, or a dedicated living space increases the functional footprint of the house in a way that estate agents and buyers understand clearly. For that reason, extensions have traditionally been seen as the safer bet when it comes to return on investment.

However, the picture has shifted.

What the Numbers Say

Property experts generally agree that a well-built, high-quality garden room will significantly contribute to your home’s value. Estimates vary by location and specification, but a well-designed, fully insulated garden room can typically increase property value by between 5% and 15%.

On a £300,000 property, that is a potential uplift of £15,000 to £45,000.

Where The Garden Room Holds Its Own

The key advantage is the ratio of cost to return. A full extension might add more in absolute terms, but at a build cost of £30,000 to £80,000 plus fees, the margin is considerably tighter. A quality garden room delivers a meaningful uplift at a fraction of the outlay.

It is also worth considering how buyers view a finished, usable outbuilding. A dedicated home office, studio, or gym is no longer a novelty. For buyers who are working remotely, it can be a genuine deciding factor.

As we cover in more detail in our guide to garden rooms and property value, the return is not guaranteed and will always depend on build quality and location.

If you want to add a genuinely usable, year-round space without the cost, the disruption, or the planning uncertainty that comes with an extension, a garden room is hard to beat. Faster to build, simpler to approve, and with a return on investment that stacks up well against the alternative.

At Pent Haus, we build garden rooms designed to be used every day, in every season. If you are ready to explore what is possible for your space, please contact us! We would love to help.

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April 21 2026

Pent Haus Kits Compared: Signature SIPs vs ToughFrame Pro & ToughFrame

penthaus Blog Post all year round garden room, customising your garden room, Designing a Garden Room, DIY Garden Room, Dream Garden Room, Garden design, Garden Home Office, Garden Room, Garden Room Benefits, Garden Room Ideas, Garden Room Kit, home gym, home office, Self-Build Garden Room, yoga studio

Building a garden room is an exciting investment, but with various technical options available, it can be tricky to decide which structure fits your needs. At Penthaus, we offer three distinct building systems designed to suit every budget, use case, and skill level.

If you aren’t sure whether to go with our Signature SIPS, ToughFrame Pro, or the standard ToughFrame, this guide will help you make the right choice.

Signature SIPS: The Ultimate All-Season Room

Best for: Year-round luxury, home offices, and high-end guest accommodation.

Our flagship system, the Signature SIPS, is the pinnacle of garden room engineering. Our high-performance Structural Insulated Panels (SIPs) use a modern construction method that offers outstanding insulation, strength, and durability. This means your space stays comfortable year-round, with lower energy costs and minimal maintenance.

SIPs also allow for a quicker, cleaner build—so you get lasting quality without the disruption. It’s a smart, future-proof choice that reflects our commitment to efficient, reliable craftsmanship.

What it is: A complete “envelope” system. The walls, floor, and roof are pre-bonded into solid, super-insulated panels, creating an incredibly rigid and thermally efficient structure.
Why choose it: It is the fastest route to a completed room (often built in just 1-3 days) and offers the highest energy efficiency for true year-round comfort. A key highlight is our unique concealed wiring system, which is hidden inside the wall panels for a sleek, seamless interior finish with no unsightly trunking.
The Vibe: Premium, ultra-efficient, and effortless.
The Spec: 100mm walls with 70mm EPS insulation, 100mm insulation in floor & ceiling, EPDM rubber roof, ToughWood cladding

Find out more about our rooms and how they can be customised

ToughFrame Pro: The All-In-One Insulated Solution

Best for: Home gyms, workshops, and comfortable garden retreats.

If you value the traditional strength of a timber frame but want the convenience of an all-inclusive insulation package, ToughFrame Pro is the ideal balance.

What it is: A traditional, heavy-duty timber frame kit that comes fully equipped with high-quality PIR insulation for the walls, floor, and roof.
Why choose it: It is a robust, “all-in-one” solution. You get the peace of mind that comes with a professional-grade timber build, with all necessary thermal components included. You don’t need to source extra materials; it arrives ready to be finished into a warm, durable space.
The Vibe: Solid, reliable, and ready-to-go for all-weather use.
The Spec: 4 to 5 day build time, 60mm PIR insultation in the walls, 70mm EPS insultation in the floor & ceiling, EPDM rubber roof & ToughWood external cladding

💡 See the Difference in Detail

Reading about structures is one thing—seeing them transformed into beautiful spaces is another. Take a look at our [Project Gallery] to see how our Signature SIPs, ToughFrame Pro, and ToughFrame buildings look in real-world garden settings.

ToughFrame: The Structural Shell

Best for: Budget-conscious DIYers, seasonal hobby rooms, and premium garden storage.

The ToughFrame Garden Room is our most affordable ‘blank canvas’ model, supplied as a high-quality structural shell without insulation or internal wall finishes. Designed as a versatile and budget-conscious kit, it provides a strong, weather-resistant timber frame and exterior composite cladding, offering a solid foundation for a variety of uses.

While this model is not supplied with insulation or interior linings, it’s fully customisable—allowing customers to add their own insulation, plasterboard, or panel systems at a later stage if desired. The ToughFrame gives you a reliable and economical starting point for creating your own functional garden building. Engineered for strength and long-term durability, the ToughFrame is the perfect entry-level garden room solution, ready for personalisation to suit your needs and budget.

What it is: The “bones and skin” of your garden room. You receive our professional-grade timber frame and weather-tight exterior cladding, but the building is provided without internal insulation or linings.
Why choose it: It is our most affordable entry point. It is perfect if you are working to a specific budget, if you want to source and install your own bespoke insulation, or if you simply need a high-quality weather-tight space for seasonal use (like a summerhouse) or secure storage.
The Vibe: Flexible, cost-effective, and perfect for the hands-on project manager.
The Spec: 4 to 5 day build time, EPDM rubber roof & ToughWood external cladding

Need Guidance on Your Project? Even if you are taking the DIY route with our ToughFrame, you don’t have to navigate the planning alone. We offer expert Design Consultations to discuss your ideas, technical requirements, and how to ensure your structure is perfectly set up for your own finishing touches.
Book now>>

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Quick Comparison Summary

Feature	Signature SIPS	ToughFrame Pro	ToughFrame
Structure Type	Pre-bonded SIPS Panels	Insulated Timber Frame	Structural Timber Shell
Insulation	EPS Included	PIR Included	None (Shell only)
Wiring	Concealed channels (Internal)	No hidden channels	No hidden channels
Build speed	Fastest – 1 to 3 days	Moderate – 4 to 5 days	Moderate – 4 to 5 days
Best for	Offices / Multi-use rooms	Offices / Multi-use rooms	DIY project / Workshop

Design your dream room with our configurator here and make a Garden Room unique to you in 3 minutes!

Still Unsure?

If you are still debating which option is the right fit, ask yourself these three questions:

How will I use it? If you plan to work from it daily in the middle of winter, opt for Signature SIPs. If it’s for a gym or a hobby workshop, ToughFrame Pro is likely your best match.
Am I a DIYer? If you enjoy the hands-on process of lining and insulating a room, the ToughFrame is your best friend. If you want it built and ready to move into, choose Signature SIPS.
What is my timeline? If you need the project completed as quickly as possible with minimal disruption, the pre-bonded nature of Signature SIPS is specifically designed to save you time on site.

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Pent Haus factory with production lead finishing ToughWood

February 24 2026

Meet the Makers: A Behind-the-Scenes Tour of Our Mid-Wales Factory

There’s a specific sound that defines the Pent Haus workshop in Mid-Wales: the rhythmic hum of a CNC machine precision-cutting components for our structural insulated panel (SIP), followed by the quiet, focused scratch of a carpenter’s pencil.

While many garden room companies are simply “middlemen” shipping in flat-packs from overseas, we do things differently. We build your Pent Haus right here in the heart of Wales. Today, we’re taking you off the showroom floor and into the sawdust to meet the people making it happen.

Precision Meets Process: The CNC Revolution

“People often ask why our kits fit together so quickly,” says Kacper, our Production Lead. “The secret is in the millimetre.”

In our factory, every SIP panel and ToughWood board is cut using state-of-the-art CNC technology. This isn’t just about speed; it’s about eliminating the human error that leads to draughty corners or sticking doors. When a customer receives their delivery, they aren’t just getting wood—they’re getting an engineered puzzle where every piece is guaranteed to align.

Why do we insist on a 1±mm tolerance? Because a garden room that fits perfectly on Day 1 is guaranteed to stay weatherproof for 10 years. Precision in our factory means no draughts in your office.

Pent Haus production lead at one of the machines

The “Secret Sauce” in the SIPs

Our workshop team takes particular pride in the bonding process. Unlike cheaper alternatives that use basic adhesives, our panels are high-pressure bonded to ensure they never delaminate.

“I’ve seen traditional timber rooms warp after one wet Welsh winter,” notes Aleks, our operations lead. “But when I see a Pent Haus leave this factory, I know that the structural integrity is locked in. It’s built to handle the British climate, period.”

Check out our Customer Gallery to see how these Welsh-made studios look in real gardens.

Sustainability: More Than a Buzzword

In Mid-Wales, we live and work surrounded by nature, so keeping our footprint small isn’t just a policy—it’s a lifestyle.

We’ve optimised our cutting patterns to ensure we have minimal timber waste.

What do we do with the off-cuts? We don’t send them to a landfill. Our team sorts the timber waste to be used as carbon-neutral biofuel, helping heat local spaces during the winter months. When you buy a Pent Haus, you’re supporting a circular economy that starts in the Welsh hills.

Our ToughWood cladding isn’t just low-maintenance; it’s PEFC certified & PVC free. By choosing materials that don’t require chemical staining every year, you’re preventing harmful runoff into your garden’s soil.
Find out more>>

A Day in the Life at Our Mid-Wales Factory

To give you a better look at how your garden room comes to life, we’re taking you through a typical day on the factory floor—from the first cup of tea to the final package being strapped down for delivery.

07:00 AM – The Morning Briefing & Material Check

The day starts at the “Build Board.” Aleks, our Purchasing & Operations lead, reviews the day’s custom orders. Because every Pent Haus is customised by the customer, no two days are the same.

For our production team, the first task is preparation.

“Starting early is essential,” says Aleks. “We have a team meeting to review the day’s plan, discuss goals, identify priority custom orders, and any changes in plans or procedures and ensure all preparations are in place.”

Safety is our foundation; before a single machine hums to life, the team is geared up in PPE (Personal Protective Equipment). In our factory, safety and quality are inseparable.

The “Millimetre-Perfect” Cut

Our team then commences operating machinery, assembling, and preparing garden rooms orders and performing quality checks.

The factory splits into its two specialist zones. The first is Machinery. This is where the “bones” of your Pent Haus are born.

Timber Cut to Size: We source high-grade FSC certified timber, which is immediately processed to the exact dimensions required for your specific build.

The CNC Cut: Our joists and panels are processed using CNC (Computer Numerical Control) technology.

“People ask why our kits fit like Lego,” says our CNC operator Dariusz. “It’s because the machine doesn’t have ‘off days.’ Every interlocking joint is engineered to a fraction of a millimetre, ensuring your build is airtight and structural.”

Our commitment to precision goes deeper than the surface; four of our core machines were designed and built in-house by our own engineers. By creating our own custom-tooled machinery, we’ve eliminated the limitations of standard equipment, allowing us to achieve structural tolerances and interlocking fits that simply aren’t possible anywhere else.

Design your dream room with our configurator here and make a Garden Room unique to you in 3 minutes!

The Cladding & “ToughWood” Treatment

After lunch, the focus shifts to the exterior which is pressed and bonded together to the garden room walls. This is where the ToughWood cladding is prepared, cut and painted.

The team hand-selects the boards to ensure the grain looks uniform. “It’s the most visual part of the build,” says Aleks. “We want the customer to see their garden room and be hit by the quality of the cladding immediately.”

Following order specifications the team set to work on painting the ToughWood cladding to the customers colour choice and place the boards in our drying area.

ToughWood panels drying ahead of bonding

Curious about the texture of our hand-finished ToughWood? Find a showroom to feel the quality before you commit to a build.

Find a stockist>>

Quality checks & Waste Management

As the day winds down, our Quality Check protocol begins. Before any Pent Haus leaves our Mid-Wales gates, it undergoes a final, multi-point quality check to ensure a “zero-defect” arrival. We manually verify dimensional accuracy, inspect the thermal bonding of every SIP panel, and hand-check the ToughWood cladding for grain consistency & paint coverage. Finally, we perform a weighted inventory of all components and seals before safely and securely packing the components securely into their delivery trailer. It’s a rigorous process designed to ensure that when your trailer arrives, every piece is seasoned for the UK climate and ready to click perfectly into place.

Ready for the Road

By evening, a complete, insulated, and weatherproof Pent Haus is packed and ready to ship. It’s a long day, but there’s a massive sense of pride in knowing that in just a few days, this delivery will become someone’s new home office, gym, or sanctuary.

Want to see the faces and the philosophy behind the brand? Read Our Full Story and Discover the Pent Haus Mission →

Problem-Solving in Real-Time

No factory is a vacuum. A typical day involves constant problem-solving & learning. Whether it’s adapting to a new process or production demand or addressing a machine breakdown, our team thrives on the challenge.

“Our routine varies depending on the day’s hurdles,” notes the production team. “But that’s where the expertise shows—addressing a deadline or a technical change without letting a single delivery date slip.”

The final push

Before the lights go out, the workshop is swept, and timber off-cuts are sorted for our Zero-Waste biofuel program. When that truck leaves our Mid-Wales gates, it carries the hard work, safety-first mindset, and Welsh pride of the people who built it.

From Our Workshop to Your Garden

Every Pent Haus starts with a conversation in Mid-Wales and ends as a sanctuary in your garden. Our factory floor is just one part of the journey—a journey fueled by a passion for British manufacturing and sustainable design

Ready to see what our makers can build for you? Configure Your Custom Garden Room with our 3D Tool →

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January 20 2026

Beyond the Slab: Choosing the Right Foundation for Your Garden Room

penthaus Blog Post all year round garden room, brick slip cladding, composite cladding, Designing a Garden Room, DIY Garden Room, Dream Garden Room, Foundation, Garden design, Garden Home Office, Garden Room, Garden Room Add Value, Garden Room Benefits, Garden Room Ideas, Garden Room Kit, home gym, home office, Insulated garden rooms, Self-Build Garden Room, wood composite cladding, yoga studio

You’ve envisioned the perfect garden room – a tranquil office, a vibrant art studio, or a cosy hideaway. But before the walls go up, there’s a crucial decision to make: the foundation. Often overlooked, the foundation is the bedrock of your entire project, influencing its longevity, cost, and even planning compliance.

In this guide, we’ll reveal the common foundation systems for garden rooms, compare their pros and cons, and introduce you to a groundbreaking alternative: The Pent Haus Foundation System.

💡 Better by Design: Why excavate when you can adapt? The Pent Haus Foundation system is compatible with sloped and uneven terrains, offering a faster, cleaner, and more sustainable alternative to concrete slabs. Get a free design consultation

Understanding Your Options: A Look at Common Garden Room Foundations

Here’s a breakdown of the most widely used foundation types for garden buildings:

1. Concrete Slab Foundation

The Traditional Workhorse

How it Works: A large, flat concrete slab is poured directly onto a prepared ground. It’s robust, provides a solid base, and is a common choice for larger, heavier structures.
Pros: Very strong, provides an even floor, good thermal mass (if insulated).
Cons:
- High Cost & Labour: Requires significant excavation, formwork, professional concrete pouring, and specialised equipment (mixers, pump trucks).
- Long Cure Time: Can take 1 to 2 weeks to fully cure, delaying the entire build.
- Messy & Disruptive: Concrete delivery and pouring are messy, requiring extensive site preparation and clean-up.
- Limited on Slopes: Difficult and expensive to lay on uneven or sloped ground, requiring extensive levelling.
- Damp Risk: Can be prone to rising damp if not properly insulated and protected, leading to condensation inside the garden room.

Pent Haus garden room on slope with views of the sea

2. Paving Slab Foundation

The DIY-Friendly Option

How it Works: Individual paving slabs are laid on a bed of sand or gravel, often with a weed membrane. Best suited for smaller, lighter sheds or storage units.
Pros: Low cost, DIY-friendly, relatively quick to install.
Cons:
- Limited Strength: Not suitable for heavier, insulated garden rooms or those with complex internal layouts.
- Uneven Settlement: Prone to movement and uneven settlement over time, especially on softer ground.
- Damp & Pests: Offers no protection against rising damp and creates easy access for pests underneath.
- Poor Insulation: Provides no thermal barrier, leading to a cold floor.

Avoiding the 2.5m planning trap – some foundation systems raise your floor height so much that you’ll need a planning application. Our low-profile system is specifically engineered to keep you compliant under Permitted Development whilst still providing a 2.2m internal height in our SIPS kits. Read Our Guide to Planning Permission →

Want to start designing your dream garden room? Try our online building tool now, and get a FREE instant quote! >>

3. Ground Screw Foundation

The “No Dig” Solution

How it Works: Large steel screws are drilled deep into the ground, providing sturdy anchor points for a timber frame to be built upon.
Pros: Fast installation, minimal excavation, suitable for uneven ground and tricky access.
Cons:
- Specialist Equipment: Requires specialist drilling machinery and skilled operators, adding to cost.
- Height Issues: Can elevate the structure, sometimes pushing the building over the crucial 2.5m Permitted Development height limit, leading to planning application requirements.
- Cost: Can be more expensive than other options, particularly for numerous screws.
- Avoid “Blind Drilling” Costs: Ground screws can fail when they hit hidden rocks or rubble deep underground. Our system is more adaptable to varied soil conditions, ensuring a level base without the risk of expensive “drilling refusal.”

Granite Pent Haus garden room on uneven ground with decking

Taking the Self-Build Route? Building your own garden room is a rewarding project, but can get complicated. Our system is designed specifically for self-builders—no heavy machinery, no concrete mixers, and no specialist skills required. Just standard tools and a solid plan. Read our Guide to Self Build Garden Rooms→

Introducing the Pent Haus Foundation System: A Smarter Way to Build

At Pent Haus, we saw the limitations of existing foundation systems and engineered a better way. Our unique foundation combines innovation, efficiency, and compliance to provide the perfect base for your garden room.

Here’s what makes the Pent Haus Foundation System stand out:

Rapid Installation & Zero Cure Time:

Time is your most valuable asset. While traditional concrete slabs can take days or even weeks to fully cure, the Pent Haus system is ready for construction almost immediately. Finish your project weeks ahead of schedule.

Cost-Effective Engineering:

We’ve stripped away the overheads. By reducing on-site labor hours and eliminating the need for expensive materials or heavy machinery, we provide a premium foundation that respects your budget.

No Specialist Equipment Required:

Forget the logistical headache of concrete pump trucks, mixers, or heavy excavators. Our system is designed for manual assembly with standard tools, keeping your site clean, quiet, and accessible.

Versatile for Any Terrain:

Don’t let a sloped or uneven garden dictate your build. Our system is naturally adaptable to a wide variety of ground types and inclines, requiring significantly less excavation and site leveling than traditional methods.

Low-Profile & Planning-Friendly:

Maximum space, minimum hassle. Our ultra-low-profile design ensures your studio stays under the 2.5m height limit, allowing you to enjoy the benefits of an elevated, breathable foundation without the need for a planning application. This is a critical advantage over other systems like that can raise your structure too high.

Watch how easy the Pent Haus foundation system is to assemble

How the Pent Haus System Works: The 4-Step Build

Our process is designed for simplicity, speed, and lasting quality:

1.Composite Foundation Posts:

We install heavy-duty composite posts directly into the ground with a postcrete set. This provides a rock-solid, rot-proof anchor.

2. The Stainless Steel Frame:

A precision-engineered stainless steel frame is bolted onto the posts. This lifts the entire studio off the ground, creating a permanent air gap that keeps your floor joists dry and well-ventilated for decades. This breathable space eliminates the risk of rising damp and condensation.

3. No-Mess Assembly:

Forget the logistical challenges of a traditional cement foundation or specialist ground screw machinery. There’s no need for heavy cement mixers, concrete pump trucks, or bulky delivery vehicles that can damage your site or struggle with narrow access. The Pent Haus system is assembled on-site using standard tools, keeping your workspace clean, quiet, and easy to manage.

4. Immediate, Compliant Build:

On average postcrete will be dry in about 1 or 2 hours, enough to take a light strain and adjustments which means you can start the next stage of a Pent Haus build – laying the floor – the same day. Because our system is so low-profile, you get the benefits of an elevated, damp-proof structure while staying safely within the 2.5m height restriction—a crucial aspect for permitted development. Whilst still retaining a 2.206m head room internally with our Signature SIPs models and 2.195m with our ToughFrame structure.

Pent Haus Garden Room unique foundation pack

Browse our collection of completed builds and see the quality for yourself. View Our Project Gallery →

The Pent Haus Difference: Why We Outperform

Feature	Concrete Slab	Paving Slabs	Ground Screws	Pent Haus System
Installation Speed	Slow (cure time)	Fast (small)	Fast	Very Fast
Cost	Medium-High	Low	Medium-High	Cost-Effective
Specialist Equipment	Yes (heavy)	No	Yes (drilling)	No
Slopes/Uneven Ground	Difficult/Costly	Unsuitable	Good	Excellent
Site Mess	High	Low	Low	Very Low

Get a Custom Foundation Quote – Ready to start your build? Use our quick quote tool to get an estimate for a Pent Haus Foundation tailored to your specific garden dimensions. [Get My Instant Quote →]

Why Pent Haus Garden Rooms Are the Best Choice

At Pent Haus, we take pride in offering garden rooms that combine style, affordability, simplicity, and sustainability. Our self-build garden rooms are budget-friendly and simple to install, so you can enjoy your dream space sooner. With ToughWood™ cladding and sustainable materials, you get a low-maintenance, environmentally responsible option that will stand the test of time.

You could have your dream office space, art studio, or home gym within 5 weeks!

With flexible customisation options and no need for planning permission in many cases, Pent Haus garden rooms offer a hassle-free solution to creating additional living space. Plus, our rooms are designed for year-round use, thanks to their efficient thermal properties and soundproofing.

Ready to start designing? It just takes 3 minutes to design your dream garden room!

Click here to build your dream garden room >>

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January 14 2026

Creating a Tranquil Treatment Studio: Katie’s Massage Therapy Garden Room

penthaus Case Study DIY Garden Room, Garden Room, Garden Room Ideas, Self-Build Garden Room

Creating a Tranquil Treatment Studio:
Katie’s Massage Therapy Garden Room

When Manchester-based massage therapist Katie outgrew her home workspace, she needed a professional, calm environment to welcome her clients. Despite not being a DIY expert, Katie achieved a high-end result by pairing a Pent Haus kit with a local carpenter. By using our online design tool and expert consultations, she created a bespoke studio tailored to her exact space. Watch the video to see why her builder—a first-time Pent Haus installer—was blown away by the build quality, and how the maintenance-free cladding and premium insulation provided Katie with the perfect year-round sanctuary for her business.

Ready to create your own dream garden room?

Visit our website for design inspiration, pricing, and to start your project consultation!

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