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Duke Grandmaster Summerhouse

Duke Grandmaster Summerhouse
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  • UK Made

11mm Tongue & Groove Shiplap Cladding | Double Door | Solid T&G Floor & Roof | UK Manufactured

What's Included

Side Windows for Wider Views of Your Garden

Side Windows for Wider Views of Your Garden

Contemporary Apex Roof Allows for Maximum Headroom

Contemporary Apex Roof Allows for Maximum Headroom

Weather Resistant Shiplap Cladding Construction

Weather Resistant Shiplap Cladding Construction

Wide Opening Double Doors for Easy Entry

Wide Opening Double Doors for Easy Entry

Better Protection and Headroom

Better Protection and Headroom

Pre-Assembled Panels for Effortless Construction

Pre-Assembled Panels for Effortless Construction

Pressure Treatment Available For a One Off Treatment

Pressure Treatment Available For a One Off Treatment

Traditional Alpine Design

Traditional Alpine Design


Weather Resistant T&G Shiplap Cladding

Weather Resistant T&G Shiplap Cladding


Door and Window Glazing Options

Door and Window Glazing Options


Apex Design Summerhouse

Apex Design Summerhouse

If you’re looking for a summerhouse to relax or work in, the Duke Grandmaster is a great choice. The building has a traditional apex design which complements any garden style.

It comes with a choice of window and floor options to suit your style and particular needs. Fully opening windows and stronger and taller doors provide easy access to the summerhouse and the building comes in a range of sizes to choose from.

Door and Window Glazing Options

This summerhouse comes with two, opening, single glazed windows as standard. Choose from Modern or Georgian windows to suit a contemporary or traditional style.

The summerhouse doors are fully braced for increased strength. For more headroom, the doors are designed to be extra high and they open fully for comfortable access.

Door and Window Glazing Options
Strong Shiplap Cladding

Strong Shiplap Cladding

The Duke Grandmaster is constructed using a strong, T&G shiplap cladding. Our shiplap panels keep rainwater and harsh weather from entering the building. This construction allows the panels to interlock, leaving no space for water to penetrate.

An 11mm shiplap cladding is used as standard for this building.You can also upgrade to the cladding to a 16mm shiplap for a stronger, more durable build.

Pressure Treatment Option

We offer the summerhouse in pressure treated for ultimate strength and durability. Pressure treatmenting works by penetrating the wood with treatment, leaving you with a building that is well protected from the elements.

Pressure treatment is great for anyone looking for a low maintenance building as the summerhouse won’t require any treatment at home.

Pressure Treatment Option
Floor Options

Floor Options

We offer a range of floor options to suit your needs. The 11mm T&G floor is included as standard with the Duke Grandmaster. This floor is suitable for domestic use only.

If you upgrade to a 19mm T&G floor, this will provide a stronger and more durable floor for the summerhouse. You can also opt for our premium 28mm T&G for heavy duty use.

Roof Option

The summerhouse is supplied with an 11mm boarded T&G roof. This includes roof purlins included as standard.

The extra strong double sided roof trusses which come with the summerhouse roof, also provide extra support and maximise the roof strength.

Roof Option
Roof Cover Options

Roof Cover Options

We recommend roof cover with every building as this provides valuable protection from the elements. Black Mineral Felt is included as standard with the Duke Grandmaster. This provides a standard level of protection for the summerhouse.

You can also upgrade to Roof Tiles for a more stylish finish and extra protection from the weather. Choose from Black, Grey or Green roof tiles if you choose to upgrade.

Dimensions 8 x 10 8 x 8 10 x 8 10 x 10 12 x 8 12 x 10 16 x 8 16 x 10 12 x 12 20 x 10 16 x 12 20 x 12
Width 318.7cm 267.2cm 267.2cm 318.7cm 267.2cm 318.7cm 267.2cm 318.7cm 381.7cm 318.7cm 381.7cm 381.7cm
Depth 243cm 243cm 301.6cm 301.6cm 360.2cm 360.2cm 477.4cm 477.4cm 360.2cm 594.6cm 477.4cm 594.6cm
Width (Internal) 304.6cm 246cm 246cm 304.6cm 246cm 304.6cm 246cm 304.6cm 360.4cm 304.6cm 360.4cm 360.4cm
Depth (Internal) 225.8cm 225.8cm 284.4cm 284.4cm 343cm 343cm 460.2cm 460.2cm 343cm 577.4cm 460.2cm 577.4cm
Ridge Height (Inc Floor) 247cm 246.6cm 246.6cm 247cm 246.6cm 247cm 246.6cm 247cm 247cm 247cm 247cm 247cm
Eaves Height (Inc Floor) 206.1cm 206.1cm 206.1cm 206.1cm 206.1cm 206.1cm 206.1cm 206.1cm 206.1cm 206.1cm 206.1cm 206.1cm
Ridge Height (Internal) 237.7cm 234.9cm 234.9cm 237.7cm 234.9cm 237.7cm 234.9cm 237.7cm 237.7cm 237.7cm 237.7cm 237.7cm
Eaves Height (Internal) 200.4cm 200.4cm 200.4cm 200.4cm 200.4cm 200.4cm 200.4cm 200.4cm 200.4cm 200.4cm 200.4cm 200.4cm
Ridge Height (Excl Floor) 243.2cm 242.8cm 242.8cm 243.2cm 242.8cm 243.2cm 242.8cm 243.2cm 243.2cm 243.2cm 243.2cm 243.2cm
Eaves Height (Excl Floor) 202.3cm 202.3cm 202.3cm 202.3cm 202.3cm 202.3cm 202.3cm 202.3cm 202.3cm 202.3cm 202.3cm 202.3cm
Door Opening Size (w x h) 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm 155.8cm x 187.7cm
Door Width 77.4cm 77.4cm 77.4cm 77.4cm 77.4cm 77.4cm 77.4cm 77.4cm 77.4cm 77.4cm 77.4cm 77.4cm
Door Height 187cm 187cm 187cm 187cm 187cm 187cm 187cm 187cm 187cm 187cm 187cm 187cm
Window Dimensions 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm 65.6cm x 121.1cm
Frame Thickness (w x d) 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm 4.4cm x 2.7cm
Materials 8 x 10 8 x 8 10 x 8 10 x 10 12 x 8 12 x 10 16 x 8 16 x 10 12 x 12 20 x 10 16 x 12 20 x 12
Material Graded European Softwood Graded European Softwood Graded European Softwood Graded European Softwood Graded European Softwood Graded European Softwood Graded European Softwood Graded European Softwood Graded European Softwood Graded European Softwood Graded European Softwood Graded European Softwood
Glazing Material Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene Styrene
Floor Material Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional
Roof Material Tongue & Groove Tongue & Groove Tongue & Groove Tongue & Groove Tongue & Groove Tongue & Groove Tongue & Groove Tongue & Groove Tongue & Groove Tongue & Groove Tongue & Groove Tongue & Groove
Roof Covering Material Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional
Features 8 x 10 8 x 8 10 x 8 10 x 10 12 x 8 12 x 10 16 x 8 16 x 10 12 x 12 20 x 10 16 x 12 20 x 12
Door Style Double Doors Double Doors Double Doors Double Doors Double Doors Double Doors Double Doors Double Doors Double Doors Double Doors Double Doors Double Doors
Windows 2 opening windows 2 opening windows 2 opening windows 2 opening windows 2 opening windows 2 opening windows 2 opening windows 2 opening windows 2 opening windows 2 opening windows 2 opening windows 2 opening windows
Shed Type Summer House Summer House Summer House Summer House Summer House Summer House Summer House Summer House Summer House Summer House Summer House Summer House
Roof Style Apex Apex Apex Apex Apex Apex Apex Apex Apex Apex Apex Apex
Cladding Style Shiplap Shiplap Shiplap Shiplap Shiplap Shiplap Shiplap Shiplap Shiplap Shiplap Shiplap Shiplap
Pre-Assembled Side Panels Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Factory Basecoat Treatment Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional Optional
Supplied with Fixtures and Fittings Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes
Please Note: This product has been designed as an affordable solution to most popular light domestic uses. All products supplied self assembly flat packed unless otherwise stated.

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