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A timber frame garden room kit gives you a warm, well-built space in your garden without the guesswork of a DIY project or the long wait of a full building contract. Whether you need a garden office, a studio, a home gym, or an additional space for the family, a bespoke kit manufactured to your exact specifications removes the uncertainty of the build.
At Cornish Frame Company, we design and manufacture every kit in our workshop in mid-Cornwall, then supply it ready for a fast, weather-tight installation. You get a structure built for Cornwall's climate, insulated for year-round use, and finished with materials chosen to suit your property and your budget. |
What is a Timber Frame Garden Room Kit?
This kind of kit is a complete structure, designed around your garden and manufactured in a controlled workshop environment before it reaches your property. Unlike generic DIY garden room kits bought online, every Cornish Frame Company kit starts with your own drawings and dimensions, so the frame fits your plot rather than the other way round. We have designed and manufactured frames for gardens across the UK with over thirty years' industry experience, from compact garden offices to larger timber-frame garden rooms.
Because the frame, walls, roof, and floor are built off-site in a our workshop, quality remains consistent, and on-site installation is much quicker than traditional construction. A garden office kit is often the simplest way to add dedicated office space without extending the main house itself. You end up with a garden room built to the same standard as our self-build timber frames and house extensions, just on a smaller scale.
Because the frame, walls, roof, and floor are built off-site in a our workshop, quality remains consistent, and on-site installation is much quicker than traditional construction. A garden office kit is often the simplest way to add dedicated office space without extending the main house itself. You end up with a garden room built to the same standard as our self-build timber frames and house extensions, just on a smaller scale.
What's Included in Our Garden Room KitEvery kit is built to your specifications, so the exact contents may vary. Here's what a typical Cornish Frame Company garden room kit includes:
Timber frame structure Precision-manufactured frame in structural-grade timber, engineered to your drawings Insulation High-performance rigid PIR insulation for walls, floors, and roofs for year-round use, with a full range of thickness options Roof covering Choice of EPDM rubber roofing, a sedum living roof, or a traditional tiled finish Windows and doors Double glazing throughout, with bifold, French or single doors to suit your layout Cladding A range of external finishes, including British cedar and other sustainably sourced materials Floor Insulated, damp-proof floor built to sit level and stay dry all year Electrics and finishing First fix electrics, plastering and internal finishing available on request |
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Why Choose a Bespoke Kit Over DIY Garden Room KitsOff-the-shelf DIY garden room kits can look like the cheaper, quicker option, but they are built to a fixed size and a fixed specification. If your garden is an awkward shape, has slopes, or sits close to a boundary, a standard kit may simply not fit, and forcing one to work can slow the whole build down.
A bespoke garden room kit is designed around your garden, your intended use and your local planning position from the outset. Every kit is built around your property, not picked from a standard range, so it arrives ready to fit with no reworking needed. If you would rather install the kit yourself, we can supply the frame only, so you still get precision-manufactured components without a full installation service. |
What a Garden Room Can Be Used For
Most customers come to us with a fairly clear idea of what they want the extra space for, even if they are not yet sure how to get there. A garden room kit can be designed around any of the following, and plenty more besides. Whatever you choose, our timber-frame garden rooms are designed to suit how you actually want to use the space.
● A quiet office, away from household distractions and close enough for an easy commute across the garden.
● A fully equipped home gym, so a long day at work does not mean skipping a workout
● An art or photography studio, with natural light positioned exactly where you need it to create the right mood
● A dedicated space for crafting, woodworking or another hobby that has outgrown the house
● A relaxing garden annexe or summer house — the perfect way to unwind after a demanding day
● Practical storage, or a garden room that doubles as a workshop
Whether it's your first garden build or your fifth, our team is happy to talk things through and offer honest guidance before any design work begins, so together we can create a plan that genuinely suits your garden.
● A quiet office, away from household distractions and close enough for an easy commute across the garden.
● A fully equipped home gym, so a long day at work does not mean skipping a workout
● An art or photography studio, with natural light positioned exactly where you need it to create the right mood
● A dedicated space for crafting, woodworking or another hobby that has outgrown the house
● A relaxing garden annexe or summer house — the perfect way to unwind after a demanding day
● Practical storage, or a garden room that doubles as a workshop
Whether it's your first garden build or your fifth, our team is happy to talk things through and offer honest guidance before any design work begins, so together we can create a plan that genuinely suits your garden.
Start Designing Your Garden RoomIf you have an idea of how you want to use your garden room, whether as a garden office or something else entirely, we would like to hear about it, regardless of where you are in the build process. Call us on 07777 758367 or send us a message via our contact page, and we will discuss your options, your site, and what is realistic for your price range.
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Our Process: From Drawings to InstallationEvery project follows the same clear path, whatever the size or complexity of your build. Here is how a typical build progresses, from first enquiry to finished room.
Enquiry and Consultation We start by talking through your ideas, site and budget to understand exactly what you need. This helps us shape a solution that fits your space and your goals from the outset. Design and Drawings We agree on the size, layout and specification with you before manufacture begins. Every detail is confirmed on paper first, so there are no surprises once production starts. Manufacture Your kit is built at our workshop in mid-Cornwall, to your confirmed drawings. Skilled craftsmanship and careful quality checks ensure every component is ready for a smooth installation. Foundation Preparation We help you choose the right base for your site, taking ground conditions and access into account. Getting this stage right lays the groundwork for a stable, long-lasting structure. Installation Our team fits your kit on site with precision and care. We work efficiently to minimise disruption while making sure every element is properly secured and aligned. Finishing We complete the cladding, glazing and internal details to get your space ready to use. This final stage brings everything together, leaving you with a polished, functional result. |
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Benefits of a Bespoke Garden Room
A garden room kit can add valuable space without the disruption of a full extension, and often at a lower overall cost. Our frames are manufactured off-site, so quality remains consistent from the workshop to your garden, regardless of the scale of your build.
Here is what a bespoke kit typically offers, and why build quality matters over time:
A garden office you can use in January as comfortably as in July is worth more than one that only earns its keep for half the year. Unwinding after a long day is easier when your garden room feels like a genuine extension of how you live, not just a shed with a window. It is one of the simplest ways to create extra space you will use every day.
Here is what a bespoke kit typically offers, and why build quality matters over time:
- Fast installation once your base is ready, often a matter of days rather than weeks
- Insulated to stay comfortable through winter and summer alike, whatever the season
- Precision manufactured away from the elements, for consistent quality and a tighter fit on site
- Natural light with windows and doors positioned to suit your garden and neighbours
- Extra usable space that can enhance your property for the whole family, often at a lower cost than a full house extension
- High-quality, sustainably sourced materials, with structural-grade timber used throughout
- Oak frame options for a more traditional, characterful finish
A garden office you can use in January as comfortably as in July is worth more than one that only earns its keep for half the year. Unwinding after a long day is easier when your garden room feels like a genuine extension of how you live, not just a shed with a window. It is one of the simplest ways to create extra space you will use every day.
Areas we deliver to
Our timber frame kits are manufactured in Cornwall and delivered across the country.
We regularly deliver to:
We regularly deliver to:
- South West: Cornwall, Devon, Somerset, Dorset, and Wiltshire
- South East: Hampshire, Sussex, Surrey, Kent, and Berkshire
- Wales: South Wales and the West Wales coastline
- Midlands and North: project-dependent, please get in touch for delivery costs
Planning Permission, Building Regulations and Fire Safety
Most garden rooms do not require planning permission and fall under permitted development rights, provided they meet certain height and size restrictions. Planning permission may be required in conservation areas, or where a garden room sits close to a boundary or is intended for a use beyond ancillary garden space.
Rules on this vary by region in the UK, so it is always worth checking with your local planning authority before construction begins. We can offer general guidance based on our experience across Cornwall, though final confirmation should come from your local council. You can read further guidance on the Planning Portal. Getting this right early helps avoid delays once your build begins.
All of our garden room kits are designed and manufactured to comply with current UK building regulations, covering structural performance, insulation, and fire safety, so your finished room meets the required standards.
Rules on this vary by region in the UK, so it is always worth checking with your local planning authority before construction begins. We can offer general guidance based on our experience across Cornwall, though final confirmation should come from your local council. You can read further guidance on the Planning Portal. Getting this right early helps avoid delays once your build begins.
All of our garden room kits are designed and manufactured to comply with current UK building regulations, covering structural performance, insulation, and fire safety, so your finished room meets the required standards.
Foundations and Installation
A solid, level base is essential for installation, and this is usually arranged before your garden room kit arrives on site. Foundation options include concrete slabs or ground screws, and the right choice depends on your ground conditions, drainage and the size of the room. Foundation type is crucial for preventing movement and damp problems once the room is complete, keeping your build sound for years to come.
Because your kit includes pre-cut materials and detailed instructions, on-site work is usually straightforward once the base is ready. Getting the foundation right keeps your build on schedule once installation begins. We can supply your kit as a manufacturer-only package for your own installer or builder, or handle full installation as part of a complete project, depending on how much support you would like from us throughout the process.
Because your kit includes pre-cut materials and detailed instructions, on-site work is usually straightforward once the base is ready. Getting the foundation right keeps your build on schedule once installation begins. We can supply your kit as a manufacturer-only package for your own installer or builder, or handle full installation as part of a complete project, depending on how much support you would like from us throughout the process.
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faq'sDo garden rooms require planning permission?
In most cases, no. Most garden rooms fall under permitted development rights, provided they meet height and size limits and are not positioned in front of the main elevation of the house. Planning permission may still be required in conservation areas or on designated land, so it is worth checking with your local planning authority before you commit to a design. Get in touch to discuss your project. How do bespoke garden room kits differ from DIY garden room kits?
DIY garden room kits are usually sold in fixed sizes, with a limited choice of layout or finish. A kit from Cornish Frame Company is manufactured to your own drawings, so the size, glazing, cladding and internal layout are all designed around your site and how you plan to use the space. This keeps your build accurate from the first drawing to the final fix. What insulation do you use for year-round use?
We typically specify high-performance rigid PIR insulation boards or sheep's wool panels for the floor, walls and roof, depending on your budget and preferences. A well-insulated timber frame efficiently regulates interior temperatures, reducing the energy needed to heat or cool the room throughout the year. Do your garden room kits meet building regulations?
Yes, every kit we design and manufacture complies with current UK building regulations, covering structural performance, insulation and fire safety. Depending on the size and intended use of your garden room, formal approval may or may not be required, and we can talk you through what is likely to be needed for your project. What is the best timber for a garden room kit?
Timber quality matters for a garden room kit. For the structural frame, C16 or C24 treated softwood offers strength and reliability at a sensible cost. For cladding, many customers choose cedar for its natural weathering and low maintenance, as well as other sustainably sourced materials. Can I choose an oak frame instead of a standard timber frame?
Yes, if you prefer the character of exposed oak, we can design your garden room around an oak frame rather than a standard treated softwood structure. This tends to suit larger annexes or garden buildings where the frame itself is part of the finished look. Our oak frame page has more detail on this option, or you can ask our team directly when you get in touch. How do you handle fire safety in a timber frame extension?
Fire safety is considered throughout the design to meet current Building Regulations. This includes fire resistance for walls near boundaries, suitable escape routes and careful detailing where the extension connects to the existing building. Any specific fire safety requirements for your project will be considered during the design process. |
