Heavy Duty Summerhouses | Project Timber™
FACTORY DIRECT — best price guaranteed, straight from the maker. 20% OFF the Hobbyist range — code SEPT20 applied automatically. GRANDMASTER — 16mm cladding upgrade & double glazing as standard. FREE DELIVERY on selected postcodes* — on our own vehicles, direct to you. 25-YEAR ANTI-ROT GUARANTEE* — on every pressure-treated building we make.
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Heavy Duty Summerhouses

10 products
Grandmaster Diplomat "Classic" G1000 Summerhouse - 11mm Pressure Treated Tongue and Groove

Grandmaster Diplomat "Classic" G1000 Summerhouse - 11mm Pressure Treated Tongue and Groove

From £1,961
35 sizes: from 8ft × 8ft to 24ft × 14ft
Grandmaster Diplomat "Classic" G1000 Summerhouse - Offset Door - 11mm Pressure Treated Tongue and Groove

Grandmaster Diplomat "Classic" G1000 Summerhouse - Offset Door - 11mm Pressure Treated Tongue and Groove

From £1,961
35 sizes: from 8ft × 8ft to 24ft × 14ft
Grandmaster Clockhouse Classic G1000 Summerhouse - 11mm Pressure Treated Tongue and Groove

Grandmaster Clockhouse Classic G1000 Summerhouse - 11mm Pressure Treated Tongue and Groove

From £2,349
27 sizes: from 8ft × 10ft to 24ft × 14ft
Grandmaster Fusion "Classic" G1000 Summerhouse with Side Shed - 11mm Pressure Treated Tongue and Groove

Grandmaster Fusion "Classic" G1000 Summerhouse with Side Shed - 11mm Pressure Treated Tongue and Groove

From £2,517
25 sizes: from 12ft × 8ft to 24ft × 14ft
Grandmaster Diplomat "Classic" G1000 Summerhouse - Long Window - 11mm Pressure Treated Tongue and Groove

Grandmaster Diplomat "Classic" G1000 Summerhouse - Long Window - 11mm Pressure Treated Tongue and Groove

From £2,011
36 sizes: from 8ft × 8ft to 24ft × 14ft
Grandmaster Duke "Classic" G1000 Summerhouse - 11mm Pressure Treated Tongue and Groove

Grandmaster Duke "Classic" G1000 Summerhouse - 11mm Pressure Treated Tongue and Groove

From £2,211
11 sizes: from 8ft × 10ft to 20ft × 12ft
Grandmaster Alpine G1000 Summerhouse Cabin - 11mm Pressure Treated Tongue and Groove

Grandmaster Alpine G1000 Summerhouse Cabin - 11mm Pressure Treated Tongue and Groove

From £5,456
8 sizes: from 16ft × 9ft to 20ft × 16ft
Grandmaster Alpine G1000 Summerhouse Cabin - Plain Side - 11mm Pressure Treated Tongue and Groove

Grandmaster Alpine G1000 Summerhouse Cabin - Plain Side - 11mm Pressure Treated Tongue and Groove

From £5,456
8 sizes: from 16ft × 9ft to 20ft × 16ft
Grandmaster Alpine G1000 Summerhouse Cabin - Long Windows - 11mm Pressure Treated Tongue and Groove

Grandmaster Alpine G1000 Summerhouse Cabin - Long Windows - 11mm Pressure Treated Tongue and Groove

From £5,607
8 sizes: from 16ft × 9ft to 20ft × 16ft
Grandmaster Diplomat Pavilion G1000 Summerhouse - 11mm Pressure Treated Tongue and Groove

Grandmaster Diplomat Pavilion G1000 Summerhouse - 11mm Pressure Treated Tongue and Groove

From £10,337
7 sizes: from 12ft × 16ft to 20ft × 16ft
Showing all 10 products
Made in Britain Free delivery (selected postcodes)* Up to 25-year anti-rot guarantee*