A stable, durable foundation is key for any garden structure. We recommend using ground screws—galvanized steel posts screwed directly into the soil. The length of the screw will vary depending on the terrain type. In most cases, a meter-long screw will suffice. This no-dig method enables fast, uncomplicated installation, even on rough terrain and sloping sites, without disturbing the surroundings. Ground screws provide a reliable, long-lasting, and eco-conscious foundation solution. The result is a stable base that supports your new garden room while preserving your garden.

Ground screws offer many advantages:

• Convenience: Installation is possible year-round, regardless of weather conditions. The process is rapid and, for most buildings, takes only a few hours. Once the installation is complete, the building work can begin immediately.
• Damp-proofing: In most gardens, the building will be elevated 5-10 cm off the ground, preventing dampness and decay and prolonging its lifespan. 
• No need for excavation or levelling:  This makes them ideal for remote, small, or eco-sensitive areas. Ground screws can be installed anywhere, including water-based environments. An interesting example is this garden room project we completed by using 8 m long screws, installed directly in the water. 
• Eco-friendly: Unlike traditional concrete laying methods, ground screws can be installed with minimal disturbance to the surrounding landscape. Furthermore, if they ever need to be removed, no permanent trace will be left behind.

We will construct the structural framework of your garden building using innovative structural insulated panels (SIPs). These prefabricated boards sandwich rigid insulation between two layers of structural OSB board. 

The floors, walls, and ceilings in your new garden building will be made with SIPs, effectively enveloping the building in one continuous blanket of insulation. This minimizes any thermal bridging and allows the structure to retain heat in winter and stay cooler in summer without heavy energy consumption.

All our mobile homes sit on a pressure-treated timber frame sealed with bitumen paint, for extra protection from moisture and added stability.

Some of the benefits of using SIPs for your project, as opposed to traditional building methods include:

• Faster assembly: Depending on the size, the shell of your garden building, will be up in 2 to 7 working days.
• Energy efficiency: Our standard 100mm thick SIP panels contain 75 mm of insulation material, giving far better thermal performance than comparable products. The thicker the SIP panel, the better the U-value of your garden building. A 250 mm SIP panel will give you a U-value of 0.1, very close to passive house standards.
• No access limitations: Having the panels pre-manufactured and assembling them on site means that difficult garden access is not a problem and we can build unique structures in areas that might otherwise cause a real issue.
• Durability: SIPs provide a very robust structural integrity. All of our garden buildings come with a 10-year structural warranty for complete peace of mind.

The roof will be constructed using a minimum of 125 mm thick structural insulated panels (SIPs) which will be covered with an ethylene propylene diene monomer (EPDM) rubber membrane. This durable, superior-quality material has a 25-year warranty for the roof’s waterproof seal. For flat roof buildings, at the design stage, we will account for a slight tilt in the roof to facilitate water drainage. This tilt will not be visible from the inside, as we will install a suspended aluminium grid ceiling system. This allows us to:

• Conceal all cables neatly and create secure electrical connections
• Install flush ceiling lights
• Ensure the interior ceiling is level, despite the exterior slope

Adding a skylight is a popular choice that many of our clients opt for. We install skylights in a way that enables rapid rainwater drainage, prolonging their lifespan. As a finishing touch, we can also help with sourcing and installing standard or motorized blind options.

Additionally, we offer a “green roof” option – a layer of Sedum Modular Roof Tray

or meadow vegetation installed atop the EPDM membrane. This is aesthetically pleasing, encourages wildlife, and provides extra insulation.

Your garden building floor is constructed from sturdy, structural insulated panels (SIPs) to create a warm interior space. We install strong chipboards atop the SIP panels, for added support, followed by your choice of flooring coverings. All of our garden-building designs come with Howden’s commercial-grade laminate flooring. The organic textures and variation in the laminate planks will add character and a natural look to any new space. Choose yours from our Flooring Selection. 

Additionally, we offer a variety of flooring alternatives to suit your needs. More information is included here.

The insulated SIP substrate offers a flat, stable base that supports any flooring type without moisture or cold transmission. If you choose to add underfloor heating, we can accommodate the supply and installation. We have experience with both electric and hydronic systems and can advise on the best option for your new space.

We install vertical timber battens directly to the SIP walls, creating channels to neatly conceal pipes and cables, providing a smooth, seamless, and safe finish. We then apply your choice of wall and ceiling coverings. The most popular choice for most clients is white-painted plasterboard, but we also offer plywood and grooved MDF as standard options. To personalise your space further, we can help suggest, source, and install many different finishes, including different paint options, wallpaper, acoustic panels, and more. If heavy equipment or items need to be wall-mounted, we can reinforce the interior walls during construction to provide adequate support.