The Evolution Insulated Garden Room with pressure-treated cladding, double glazing and a fully insulated roof, walls and floor.
The Pressure Treated Evolution Insulated Garden Room is a fully insulated garden room built from pressure-treated secret nail vertical cladding for a strong, weather-resistant finish. A timber door and double glazed windows combine with 90mm insulated walls to keep it warm year-round, while the smooth primed interior gives a ready-to-decorate finish. Pre-assembled modular panels make for a straightforward build, complete with an EPDM rubber roof and a 25-year anti-rot guarantee* for lasting peace of mind.
Prices as per the live configurator. Paint/trim swatch colours are indicative approximations.
For a stronger and longer lasting building with engineered vertical interlocking cladding.
2m internal eaves, fully insulated walls and a smooth primed interior surface, ready to paint, furnish and use from day one.
A fully insulated garden room with a pressure-treated timber frame, combining long-term weather protection with year-round thermal comfort.
Pressure-treated against fungal decay and rot, painting required annually.
11mm tongue and groove roof boards with multi-foil insulation and EPDM rubber weatherproof covering.
Flatpacked and fits through a standard UK door with all fixings included.
No hidden extras and no surprise add-ons. Your Garden Office arrives complete — every panel, fixing and fitting ready to go.
Factory-applied before it leaves us, at no extra cost.
Insulated walls, floor and roof keep the interior comfortable in all seasons.
Wide UPVC double doors for easy access and a more open, welcoming entrance.
Double glazed windows and doors as standard for better insulation and a quieter interior.
90mm wall build-up delivers excellent thermal performance and a solid, substantial feel.
Pressure-treated against fungal decay and rot. Painting required annually.
Stage-by-stage illustrated instructions with all fixings included.
We offer free UK delivery on selected postcodes.
The Evolution is insulated in the walls, floor and roof with high-performance multi-foil insulation. Its layered design traps heat in the cold months and reflects it in summer, achieving U-values comparable to 120mm of glass wool, in a far slimmer profile that leaves more room inside. An EPDM rubber roof is included as standard for long-lasting, maintenance-free weather protection.
16mm pressure-treated boards are fixed with a secret-nail profile, so each board is held by a hidden fixing in the tongue and the face is left completely clean, no exposed nail heads. The boards are positioned vertically down the building giving it a contemporary look. Treated annually, it holds both its finish and its shape for years.
Each panel is built on a 27x44mm structural timber frame and clad in 16mm secret-nail vertical boards, fixed without exposed fixings for a clean, contemporary finish. The cladding is pressure-treated against fungal decay and rot, and should be painted or treated annually to maintain the anti-rot guarantee and keep the building in the best condition.
Arrives as pre-assembled modular panels in sections small enough to fit through a standard door. Stage-by-stage illustrated instructions and every fixing and fitting included in the same delivery.
Add assembly at checkout →
Choose 11mm or 19mm tongue and groove floor to suit how you plan to use the building.
Multiple sizes from compact to large.
Upgrade to UPVC doors and windows with a choice of white or graphite.
Add guttering to manage rainwater runoff and protect the base of your building.
High-quality paint supplied in a tub. Apply after assembly to colour and protect the timber.
Optional timber base frame for use on firm, level ground if you don't have an existing concrete or paved base.
Turn the bottom of your garden into a private, professional workspace, quiet, insulated and distraction-free. Just as at home as a gym, studio, hobby room or therapy space.
| Overall Width | 253 cm |
| Overall Depth | 229.2 cm |
| Total Wall Thickness (incl. insulation) | 80 mm |
| Width (internal) | 229 cm |
| Depth (internal) | 174.3 cm |
| Eaves Height (inc. floor) | 230.7 cm |
| Eaves Height (excl. floor) | 218.2 cm |
| Ridge Height (inc. floor) | 240.2 cm |
| Ridge Height (excl. floor) | 227.7 cm |
| Eaves Height (internal) | 204.4 cm |
| Ridge Height (internal) | 212.4 cm |
| Door Height | 180 cm |
| Door Width | 73 cm |
| Door Opening (H × W) | H180 × W73 cm |
| Glazing Thickness | 4–20–4 mm |
| Frame Thickness (H × W) | 2.7 × 4.4 cm |
| Overall Floor Size (W × D) | 249 × 194.3 cm |
| Base Size | 244 × 189.3 cm |
| Cladding | 9mm LP Strongcore composite |
| Floor material | Tongue & groove |
| Roof material | Galvanised steel & foam insulation |
| Roof covering | Galvanised steel |
| Glazing | Double glazing |
| Building type | Garden room |
| Windows | 4 |
| Roof style | Pent |
| Cladding style | Composite board |
| Locking system | UPVC multi-point |
| U-value, metal roof | 0.49 W/(m²·K) |
| U-value, walls & floor | 0.31 W/(m²·K) |
| Pre-assembled panels | Yes |
| Interchangeable windows | No |
| Fixtures & fittings | Yes |
Free delivery to selected postcodes, and Made in Britain.
"Genuinely warm in winter — I work in here every day now. Build quality is excellent."
"Panels went together far faster than I expected. The composite finish looks premium."
"From order to install was seamless. The team kept me informed the whole way."
British-made garden buildings, designed and built in Nottinghamshire.
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