A premium Grandmaster summerhouse with long double doors, double glazing as standard, extra tall eaves and 36 sizes from 8x8 to 24x14.
The Diplomat Classic is a pressure-treated summerhouse with a traditional apex roof and extra tall, long double doors for easy access. Side-hung opening windows and double glazing are included as standard, with an extra strong double-sided roof truss for durability. Available in 36 sizes from 8x8 up to 24x14, there's a Diplomat to suit almost any garden.
Prices as per the live configurator. Paint/trim swatch colours are indicative approximations.
For a stronger and longer lasting building with engineered interlocking cladding.
Taller than standard doors for easier access and double glazing throughout.
High eaves and ridge make the interior feel like a proper room, not a garden shed.
Pressure-treated against fungal decay and rot, painting required annually.
Traditional apex roof with green mineral felt as standard.
Flatpacked and fits through a standard UK door with all fixings included.
No hidden extras and no surprise add-ons. Your Summerhouse arrives complete — every panel, fixing and fitting ready to go.
Factory-applied before it leaves us, at no extra cost.
Upgrade from 11mm to 16mm tongue and groove shiplap for an even stronger wall.
Tongue-and-groove floor and roof for a solid, tight build.
Double glazed windows and doors included as standard.
Every fixing and fitting included as standard, with premium quality throughout.
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 Diplomat is the classic Grandmaster summerhouse — long double doors, double glazing as standard, 2m eaves, side-hung opening windows as standard and 36 sizes from 8×8 to 24×14. Works as a garden retreat, office, gym or entertaining space.
Every Grandmaster panel is built on 27x44mm framing with key supports doubled to 54mm, giving the building a rigidity you can feel. Pressure-treated 11mm shiplap cladding with a 16mm upgrade option, an 11mm T&G roof on heavy-duty purlins and mineral felt covering as standard, backed by a 25-year anti-rot guarantee*. Built properly and treated annually, this is a building that will give you years of enjoyment.
27x44mm panel framing with key supports doubled to 54mm, plus an extra strong double-sided roof truss. Pressure-treated 11mm shiplap with a 16mm upgrade option, green mineral felt as standard and a 25-year anti-rot guarantee*.
Your Summerhouse arrives as pre-assembled, pre-insulated panels — designed to fit through a standard UK doorway and slot together with far fewer parts than a traditional log cabin. A quicker, simpler build, whether you do it yourself or bring in help.
Every building includes clear, step-by-step illustrated instructions. We recommend two people with basic DIY know-how — or add our assembly service at checkout and we'll handle it for you.
Add assembly at checkout →
Choose 11mm or 19mm tongue and groove floor to suit how you plan to use the building.
Choose 11mm tongue and groove shiplap as standard, or upgrade to 16mm for a more substantial build.
Green mineral felt as standard. Upgrade to EPDM rubber roof for longer protection.
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.
Built around how you use it, with options to make it exactly right.
| 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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