– Attractive Shiplap Cladding
– Multi-Location Windows & Double Doors
– Base Coat Treated
– FSC Certified Timber
– Traditional, high quality build
– Felt, Fixings and Fitting Instructions Included
– Manufactured In Britain
– Self Assembly Required

Shire Mammoth Heavy Duty Pine Shiplap Timber Workshop 10×20 (Pine Log Optional) (Made To Order)



100000 in stock

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Wood Type * 

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Felt Tiles * 

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All Shire Timber Sheds and Products are made to order and have a delivery lead time of up to 18 weeks.

All Shire Timber Sheds and Products marked EXPRESS 14 DAYS will be delivered typically within 2 to 3 weeks.
Shire Timber Products would like to apologize for an inconvenience caused.
All installations with Shire Garden Buildings is currently suspended. Please do not select this option.

Delivery Options

Please take a look at the delivery options for your area HERE

Shire Mammoth Heavy Duty Pine Shiplap Timber Workshop 10×20

(Pine Log Optional) 

This extremely sturdy British Workshop from Shire is traditionally manufactured from high grade FSC Certified timber. The ledged and braced double doors are standard and can be fitted in any panel. The 3″ x 2″ framing and fully braced panels make the Mammoth one of the strongest Workshops available. The roof and walls are constructed using 12mm shiplap with a heavy duty 16mm tongue and groove floor with 3″ x 2″ floor joists. Felt, fixing kit and instructions are all supplied.

The Mammoth Workshop is true to its name in both build and size. The range extends from the smallest, but still sizeable 10×10 to the absolutely epic 30×12 model.  Each Mammoth Workshop is made to order by the factory, just for you. The modular nature of the side panels allows you to decide where the doors and windows are positioned in order to make best use of your garden and the available light. Double door access allows plenty of space to enter and exit with whatever you need. There is plenty of space for a workbench or two and still more than enough room for storage and to walk around. Constructed entirely from tongue and groove cladding to the walls, floor and even the roof on a super-heavy 44x70mm robust framework for increased strength. Mineralized felt is supplied to cover the roof and full instructions, fixtures and fittings are provided as standard. 


Cladding (mm)12x120mm Shiplap Tongue & Groove 114mm face
Framework Size (mm)44×70
Floor Material16x160mm Buffalo T&G 139mm face
Roof Material12x120mm Matching T&G 114mm face
Door TypeDouble Joinery
Door HandleRim Lock
Window Type2 opening
Window QTYvaries – see images
RangeProfessional Range
Door Height (ft)5’11”
Door Height (mm)1805
Door Width (ft)4’8”
Door Width (mm)1424
Floor Bearers (mm)70×45
Floor Bearers Pressure Treatedno
Glazing Materialglass
Window Height (Ft)2’9”
Window Height (mm)847
Window Width (ft)4’1”
Window Width (mm)1018


This item is delivered flat packed and comes with all necessary instructions.

Warranty Information

This item comes with a 12 month manufacturer’s warranty for your complete peace of mind.

A factory applied coat treatment is applied to the product.




Base Size (front x Side) - cm

Deliver Time (working Days)

Guarantee (years)

Main Door Opening Size (height x width) Wall Height (cm)

Overall Height Wall Height (cm)

Panel Thickness (mm)

2nd Door Opening Size (height x width) Main Door Opening Size (height x width) Wall Height (cm)


Wall Height (cm)