Garden Room Specifications

Foundations & Groundworks

The foundation transfers the building's load into the ground and keeps it level for its lifetime. Getting it wrong shows up later as doors that stick, floors that move and cladding that opens up at the joints.

Ground screws are a common solution: quick to install, minimally disruptive to the garden and well suited to many sites. Concrete bases suit other situations, particularly where loading, levels or ground conditions call for them. Site preparation covers clearing the area, establishing levels, identifying underground services and dealing with drainage or soft ground before anything is set.

The choice is made after the site survey. Any company specifying a foundation type before seeing your garden is guessing.

Structural Frame

Above the foundation sits a structural timber frame engineered for the spans, openings and loads involved. Large glazed openings remove structure from a wall, so the frame has to be designed around them rather than adjusted on site.

Frame quality determines squareness, long-term door and window operation, how cladding sits and the building's durability. It is the least visible part of the finished room and one of the most important.

Insulation

Insulation is applied to the floor, the walls and the roof. Together with double glazing and controlled ventilation, it is what allows a garden room to be used through winter without excessive heating, and helps limit overheating in summer.

Thermal performance also affects running cost. A well-insulated room reaches temperature faster and holds it longer, which matters if you are heating the space every working morning from October to March.

Roofing

Contemporary garden rooms typically use a flat roof with a designed fall and an EPDM membrane covering, which provides a durable, seamless weatherproof layer. Guttering takes water clear of the building and away from the base, which protects both the cladding and the ground around the foundation.

Roof build-up combines structure, insulation, the weatherproof layer and the edge detailing — fascias, trims and drips — that stops water tracking back into the construction.

External Cladding

Cladding defines how the building looks and how much maintenance it needs. Where offered for your project, options can include cedar, Thermowood and composite boards.

• Cedar — a naturally durable timber that silvers over time unless treated to retain its tone.
• Thermowood — heat-treated timber with improved stability and durability compared with untreated softwood.
• Composite boards — hold colour with minimal maintenance, useful on exposed or coastal sites.

Exposure matters: an estuary-facing garden near Southend weathers differently from a sheltered plot in Epping, and cladding and fixings are chosen accordingly.

Windows & Doors

Glazing is specified as double glazed units within frames chosen for thermal performance and durability. Where applicable, aluminium and uPVC systems are both available, and the door configuration is chosen to suit the elevation and how you use the room.

• Sliding doors — a large glazed area with a fixed and moving panel; they need no swing space, which suits smaller gardens.
• Bi-fold doors — open almost the full width of the elevation, ideal for social and entertainment rooms.
• French doors — a good fit for narrower elevations and more compact buildings.

More glass means more daylight and more solar gain, so glazing extent is balanced against wall space, shading and how the room is used.

Electrical Installation

The electrical design is set before construction so cabling is run at first fix. Where applicable, an installation can include a supply from the house, a consumer unit in the garden room, socket positions matched to your furniture layout, separate lighting circuits, external lighting and data provision.

Electrical work is carried out in accordance with the applicable regulations, and the scope for your build is confirmed in the quotation.

Heating & Cooling

Heating is sized to the room's volume, glazed area and use pattern. Options can include electric panel heaters, electric underfloor heating, and air conditioning units that provide both heating and cooling.

Ventilation is specified alongside heating rather than separately. A well-sealed room needs a controlled way to manage moisture, particularly in gyms and rooms used by several people at once.

Internal Finishes

The interior is finished to a domestic standard: wall linings that can be plastered and decorated, skirting, and a floor finish chosen for the use — engineered timber or vinyl for offices and studios, rubber for gyms, and cleanable surfaces for salons and treatment rooms.

Storage and joinery are considered at the same time, because built-in solutions almost always use a compact footprint better than free-standing furniture.