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50 years experience
Manufactured in Great Britain
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Grandmaster Extra Heavy Duty and Tall Workshop Shed

Free Anti-Rot Treatment - Guaranteed for 15 years*
  • Extra STRONG
  • EXTRA TALL
  • UK Manufactured By Us
  • Multiple Design Options
  • Fully Pressure Treated*
  • Free UK Delivery*

From £55.17 / month

I Choose your treatment

  • Standard Dip Treatment
  • FREE PRESSURE TREATMENT
    WORTH
In stock
Mortice lock and lockable windows
Extra tall inside
Stronger and taller double doors
16mm cladding upgrade
15 year anti rot guarantee
Fully opening windows

Disclaimer : Painted buildings are for illustration purposes only. All buildings are in their standard or pressure treated colour upon delivery. A distance of 1m must be kept between the boundary and your building to allow access for annual treatment and to comply with the anti-rot guarantee*.

Grandmaster Extra Heavy Duty and Tall Workshop Shed Features

High quality materials

We only use the very best materials for our garden buildings.

15 year anti-rot guarantee*

Our buildings are pressure treated as standard, giving your building extra protection from rot and decay.

Longer lasting

Our shiplap tongue and groove cladding is specially designed to give your building extra weather protection

Thicker and doubled-up framing

Made with extra thick 44mm framing to give your building increased strength and rigidity.

Extra tall interior

Our grandmaster range gives you a generous 2m internal eaves height so that you have more useable space.

Small opening windows for added privacy

Small opening windows give you added privacy and also extra ventilation.

Fully braced doors

Our tall and wide double doors allow for better access and better security with our thicker timber bracing.

Pent style contemporary roof

A flat contemporary roof gives your building a modern look.

Heavy duty tongue and groove roof construction

Our pent roof is made from heavy duty purlins and tongue and groove cladding for a stronger and longer lasting roof.

Upgrade

Tongue and groove flooring thicknesses available

Upgrade to a thicker floor for everyday use and to store those heavier items.

Optional

multiple sizes available

For heavy-duty storage or a heavy-duty workshop, you can choose the size that's best for you.

Pre-assembled Panels that fit through your door

Our buildings come flat packed using pre-assembled panels, which are easier to lift and also fit through your door.

Optional

Mineral felt included as standard. Upgrade to rubber roof

For the ultimate weather protection choose our heavy-duty rubber roof for protection that lasts up to 50 years.

All fixings and instructions included

Our simple stage by stage instructions makes assembly easy with all fixings provided.

Select Size
Select Measurements
Metric
Imperial
Overall Dimensions
Overall Width
Value
Overall Depth
Value
Width Internal
Value
Depth Internal
Value
Eaves & Ridge
Eaves Height Inc. Floor
Value
Eaves Height Excl. Floor
Value
Ridge Height Inc. Floor
Value
Ridge Height Excl. Floor
Value
Eaves Height Internal
Value
Ridge Height Internal
Value
Features
Windows
Value
Shed Type
Value
Project Timber Range
Value
Roof Style
Value
Fixtures & Fittings
Value
Cladding Style
Value
Locking System
Value
Interchangeable Windows
Value
Basecoat Treatment
Value
Pre-Assembled Side Panels
Value
Select options
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  • Size
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  • Wall Thickness
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  • Floor
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  • Guttering Option
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  • Roof Cover
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  • Paint Colour
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  • Colour Trim
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  • Silicone Gun
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  • Laminate Floor
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  • Building Assembly Service
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