Grandmaster “Heavy Duty” Apex Workshop – Windowless – Pressure Treated

8 x 8
10 x 8
12 x 8
14 x 8
16 x 8
18 x 8
20 x 8
22 x 8
24 x 8
8 x 10
10 x 10
12 x 10
14 x 10
16 x 10
18 x 10
20 x 10
22 x 10
24 x 10
8 x 12
10 x 12
12 x 12
14 x 12
16 x 12
18 x 12
20 x 12
22 x 12
24 x 12
8 x 14
10 x 14
12 x 14
14 x 14
16 x 14
18 x 14
20 x 14
22 x 14
24 x 14

Delivery from,   Wed 7th June

The size you have selected is



In Stock


High Quality Materials

Thicker & doubled up timber framing with shiplap construction.

25 year Anti Rot Guarantee*

Pressure treated to protect against fungal decay and rot.

Fits through a standard door

Modular sections that fit through your door and make assembly easier.

What’s included?

  • All fixings and fittings
  • Easy to follow instructions
  • Pre-assembled panels, roof and floor
  • Extra high ridge and eaves height
  • Signature mineral felt
  • 15 year guarantee* with pressure treated panels

We do the hard work for you

Grandmaster comes with pre-assembled panels which we build in house and check before it’s delivered to your door. Making the installation of Grandmaster easier for you or your installer, whilst saving you time and money.

Alongside this we have created a set of easy to follow instructions which are sent out with every building, making your Grandmaster experience a pleasant one.

Hand Crafted

Grandmaster is built by our fully trained product assembly team using hand-selected graded scandinavian slow grown timber at our facility in Nottinghamshire, in the cusp of Sherwood Forest.

All of products are picked, checked and packed for delivery making sure everything meets our high standards.

Build Grandmaster to your specification

The Grandmaster is built up of modular panels. Meaning that you can customise your building to your needs. Choose from base-coated or pressure treated finish which comes with a 15 year anti-rot guarantee*. Upgrades from external cladding thickness (11mm or 16mm) to flooring thickness (11mm, 19mm, or 28mm) providing a stronger base for heavier applications. For extra protection we can upgrade you to a rubber roof protecting your outdoor building for up to 50 years.

Choose from one of the sizes we offer. Our Pressure Treated Traditional Windowless Apex Grandmaster Workshop Shed comes with the following as standard –




High quality materials

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




15 year anti-rot guarantee*

Peace of mind that your building will stand proud for years.




Longer lasting

Our buildings are designed to last.




Thicker and doubled up framing

27mm x 44mm panel framing – thicker than standard. Key supports are doubled up to 54mm for extra support.




Fully braced doors

  • Open fully for extra comfort
  • Extra high for more headroom
  • Fully braced for increased strength




Mortice lock and lockable windows

Extra high security with a three lever lock to keep your belongings safe.




Extra tall interior

  • 2.3m ridge height for 8ft range
  • 2.4m ridge height for 10ft / 12ft
  • Room for taller items
  • A comfortable space for all day use




Extra strong, double sided roof trusses

Extra support to maximise the roof strength.



Easy and strong tongue and groove construction

Our shiplap panels keep rainwater and other harsh elements from entering the building. This is primarily due to its construction where the panels closely interlock, leaving no space for water penetration and weather damage.



11mm shiplap

Tongue & groove


16mm shiplap

Tongue & groove




Roof cover

A choice of roof covers for your preference and budget



Mineral felt


Black roof tiles


Grey roof tiles


Green roof tiles