Design and build your own bespoke garden room

We design our bespoke garden rooms to suit the individual needs and requirements of each client, ensuring that each one is unique.

We have carefully detailed our design and build process below, along with some examples of our bespoke garden rooms. For more details on each of the different garden rooms we offer, please visit the Our Products page, or get in touch with us to find out more.

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  • Small modern wooden house with a covered porch, large windows, and a glass door, set against green trees.
  • A small wooden extension with large glass doors and windows is built onto the side of a house with a shingled roof. The area around the extension is a mix of gravel and grass, with construction materials on the ground. In the background, there are hills and some open fields under a partly cloudy sky.
  • Outdoor wooden patio with beige cushioned sofa and armchair, small glass-topped table, potted plants, and a wooden privacy wall, under cloudy sky.
  • A modern wooden house with large glass sliding doors and a covered terrace, surrounded by trees.
  • A wooden gazebo with a sloped roof and black metal railing surrounds an above-ground swimming pool, located in a backyard with green trees and a wooden fence.
  • A backyard garden with a small wooden house, surrounded by green plants, shrubs, and colorful potted flowers, under a blue sky with some clouds.
  • Snow-covered house with wooden exterior, windows with snow on the sills, surrounded by snow-laden bushes and trees. The sky is cloudy with patches of light.
  • A small wooden shed with black-framed glass doors and windows, built on a wooden deck, situated in a backyard with grass and a large tree nearby.
  • A backyard scene with a stone wall, a raised deck with steps, decorative statues, potted plants, and a gravel pathway, under a blue sky with some clouds.
  • Small wooden house with large windows, built on a brick foundation, with a wooden deck in a garden with grass.
  • A small modern backyard shed with brown wooden siding, large glass double doors, and a big window, surrounded by green trees and a fenced yard, with a wooden deck and steps leading up to the entrance.
  • A small wooden house with a dark gray sloped roof, a sliding glass door on the front, a small horizontal window on the side, surrounded by green trees, with a wooden deck and steps, and a decorative plant pot outside.

Design & Build


With 20 years of experience in building timber kit houses, we have ensured that we construct our bespoke garden rooms to the highest standard, tailoring them to meet your needs at very competitive prices.

We manufacture our bespoke garden rooms to the same meticulous quality and standards as a modern timber-framed house. They are designed and built to ensure excellence in every aspect.

  • Garden rooms are designed to breathe. The structure is made using pressure treated timbers, sheeted in 9mm OSB board and then wrapped in a breathable water resistant membrane. This membrane acts as a water resistant barrier to help allow the structure to breathe and prevent condensation. We then form a 50mm cavity by using 38 x 50mm pressure treated timbers at 600mm centres wrapped in a DPC (damp proof course) then clad with Western Red Cedar as standard. Although other cladding options are available.

  • Once the structure is built, we move it onto your site. Customers can either build their own foundations or we can build it for them. A modern option we provide is to install a ground screw foundation rather than a concrete base. A ground screw foundation provides a solid base without any digging and is mess-free. Unlike our competitors we fit a galvanised steel base under the floor cassette, ensuring you have no unwelcome visitors. 

  • Once the structural kit is assembled, we fit the insulated composite metal roof, UPVC double glazed windows & doors and gutters, finishing with the exterior cladding & then we move inside.

    The structural kit is the skeleton structure of your bespoke garden room and is built in the same way as timber kit houses. We use our house building knowledge & skills to give you a super-insulated comfortable space you can use all year round.

  • We offer a wide selection of cladding materials, and the final choice is completely up to you. Whether you prefer natural timber finishes or modern composite options, we can supply a range of styles to suit your project. Popular choices include Western Red Cedar, Cedral cladding, Pine tongue & groove, Pine shiplap, and various treated timbers.

    Each material has its own look and maintenance requirements, and we’re happy to guide you through the options so you can choose the finish that best fits your design and budget.

  • To create a natural flow from your garden room to your garden, why not choose aluminium bi-fold doors & windows or uPVC French doors and windows? The colour choices are fantastic and give you either the contemporary or traditional look you want.

  • Our fully qualified electrician then wires the garden room to include your required sockets & lighting and also fits the consumer unit which will be connected to your house power supply once the internal space is completed.

  • We fully insulate the floor and all walls to ensure it meets the latest regulations. The insulated composite roof also adds to the insulation values & utilising maximum insulation ensures each garden room we manufacture remains warm in winter yet cool in summer, making them suitable for all year round use, not just the summer!

  • Once the insulation is completed, we fit the moisture-resistant floorboards and the foil-backed plasterboard to the walls. The foil-backed plasterboard reflects heat back into the building. We then ames tape all the joints, allow them to dry and then return the next day to paint the first coat on the walls.

    The joiners then return to fit the skirtings and windowsills and the electrician also returns to second fix all the sockets and lights. The painters then return to final coat all walls, skirtings and windowsills.

The Complete Package!

On-site installation from foundations to the finished interior. We design, manufacture and build our garden rooms, so whatever space you have, we are able to design your garden room to suit. Our design service is there to help you choose the ideal size, layout and position for your garden room.

All our prices include the complete package – off-site construction, on-site installation by our own fully trained professional installation team. Each high-quality garden room is installed at your home with the minimum of disruption, typically within 7–10 working days and normally without the need for planning permission. Our Express Rooms can even be installed in under 48 hours. From foundations to finished interior, our construction methods provide the complete package at a fixed price.

More Inspiration

A small wooden garden shed with sliding glass doors and a window, set on a wooden deck, with gardening tools and colorful flowers nearby, under a bright blue sky.
A small wooden house with large window on a lakeside property, surrounded by gravel and potted plants, with water and trees in the background under a partly cloudy sky.
Outdoor deck with patio furniture, including a glass-top table, wicker chairs, and an outdoor hot tub under a wooden overhang, with a partly cloudy sky above.
A small wooden house on a raised deck surrounded by trees and greenery, with large glass doors and windows.

express rooms

A modern, small building with glass double doors and two potted plants outside, situated in an outdoor area with a grassy field and trees in the background.

Their unique channel installation method eliminates the need for a timber or steel frame substructure, the speed of build means the Garden Room can be installed within 2 days, creating a watertight building whatever the weather.

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Log cabins

A small wooden house with large windows and a glass doorway is situated on the edge of a body of water, with trees in the background and a cloudy sky overhead, and the house is reflected in the water.

Bertsch‑Holzbau cabins use precision‑machined, interlocking log construction for a stable, high‑quality build. Their pre‑cut components allow for smooth, efficient assembly, creating a solid, weather‑resistant structure once installed on a suitable foundation.

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