Workshop Shed | Pressure Treated Traditional Windowed Offset
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FREE NEXT DAY DELIVERY
on selected postcodes*
15-YEAR ANTI-ROT GUARANTEE
Terms and conditions apply
FREE PRESSURE TREATMENT
on selected products*
0% APR
with £0 deposit

Disclaimer : Painted buildings are for illustration purposes only. All buildings are in their standard or pressure treated colour upon delivery where the colour may vary from those shown. Adequate distance must be kept between the boundary and your building to allow access to apply the annual treatment to comply with the anti-rot guarantee*.

What our customers say

  • James, Merseyside
    "Fantastic communication and great service. Excellent quality shed. Would highly recommend."
FREE NEXT DAY OR PICK A DATE DELIVERY ON CHECKOUT

Grandmaster “Heavy Duty” D1000 Workshop – Offset Doors – Pressure Treated

View Windowless Version

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*
  • Shatter Resistant Styrene Glazing
  • Upgrade to Glass Double Glazing
  • Assembly time is 4x faster than a log cabin!

£4,899
£4,409
For 10% discount use code SPRING10

1 Choose your treatment

  • Standard Dip Treatment
  • FREE PRESSURE TREATMENT
    WORTH £490
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

2 Choose your size

  • 8ft x 8ft pressure treated traditional windowed offset grandmaster workshop
    8 x 8
    + £0
    £1,599 £1,439
  • 8ft x 10ft pressure treated traditional windowed offset grandmaster workshop
    8 x 10
    + £150
    £1,749 £1,574
  • 10ft x 8ft pressure treated traditional windowed offset grandmaster workshop
    10 x 8
    + £415
    £1,749 £1,574
  • 12ft x 8ft pressure treated traditional windowed offset grandmaster workshop
    12 x 8
    + £445
    £1,899 £1,709
  • 10ft x 10ft pressure treated traditional windowed offset grandmaster workshop
    10 x 10
    + £665
    £1,999 £1,799
  • 8 x 12
    + £500
    £2,099 £1,889
  • 12ft x 10ft pressure treated traditional windowed offset grandmaster workshop
    12 x 10
    + £865
    £2,199 £1,979
  • 14ft x 8ft pressure treated traditional windowed offset grandmaster workshop
    14 x 8
    + £1077
    £2,199 £1,979
  • 8 x 14
    + £800
    £2,399 £2,159
  • 10 x 12
    + £1065
    £2,399 £2,159
  • 14ft x 10ft pressure treated traditional windowed offset grandmaster workshop
    14 x 10
    + £1277
    £2,399 £2,159
  • 16ft x 8ft pressure treated traditional windowed offset grandmaster workshop
    16 x 8
    + £1277
    £2,399 £2,159
  • 18ft x 8ft pressure treated traditional windowed offset grandmaster workshop
    18 x 8
    + £1477
    £2,599 £2,339
  • 16ft x 10ft pressure treated traditional windowed offset grandmaster workshop
    16 x 10
    + £1527
    £2,649 £2,384
  • 12 x 12
    + £1365
    £2,699 £2,429
  • 10 x 14
    + £1465
    £2,799 £2,519
  • 20ft x 8ft pressure treated traditional windowed offset grandmaster workshop
    20 x 8
    + £1677
    £2,799 £2,519
  • 18ft x 10ft pressure treated traditional windowed offset grandmaster workshop
    18 x 10
    + £1777
    £2,899 £2,609
  • 14 x 12
    + £1877
    £2,999 £2,699
  • 22ft x 8ft pressure treated traditional windowed offset grandmaster workshop
    22 x 8
    + £1877
    £2,999 £2,699
  • 12 x 14
    + £1765
    £3,099 £2,789
  • 20ft x 10ft pressure treated traditional windowed offset grandmaster workshop
    20 x 10
    + £1977
    £3,099 £2,789
  • 16ft x 12ft pressure treated traditional windowed offset grandmaster workshop
    16 x 12
    + £2077
    £3,199 £2,879
  • 24ft x 8ft pressure treated traditional windowed offset grandmaster workshop
    24 x 8
    + £2077
    £3,199 £2,879
  • 22ft x 10ft pressure treated traditional windowed offset grandmaster workshop
    22 x 10
    + £2177
    £3,299 £2,969
  • 14 x 14
    + £2377
    £3,499 £3,149
  • 18 x 12
    + £2377
    £3,499 £3,149
  • 24ft x 10ft pressure treated traditional windowed offset grandmaster workshop
    24 x 10
    + £2377
    £3,499 £3,149
  • 20ft x 12ft pressure treated traditional windowed offset grandmaster workshop
    20 x 12
    + £2577
    £3,699 £3,329
  • 16ft x 14ft pressure treated traditional windowed offset grandmaster workshop
    16 x 14
    + £2677
    £3,799 £3,419
  • 22 x 12
    + £2877
    £3,999 £3,599
  • 18 x 14
    + £2977
    £4,099 £3,689
  • 24 x 12
    + £3177
    £4,299 £3,869
  • 20ft x 14ft pressure treated traditional windowed offset grandmaster workshop
    20 x 14
    + £3227
    £4,349 £3,914
  • 22 x 14
    + £3477
    £4,599 £4,139
  • 24 x 14
    + £3777
    £4,899 £4,409

24 x 14

24ft x 14ft pressure treated traditional windowed offset grandmaster workshop
£4,899

4 Choose your window fixings

Please note: UPVC will increase the lead time of the building. Please contact us before placing your order.

Details

X

  • Economy Fixings

    Our economy silver fixings are butt hinges that are suitable for our single styrene glazing option. The opening windows are top hung where they also come with silver casement stays as standard.

  • Premium Fixings

    Our premium brass hinges are more heavy-duty and can easily support the weight of our double glazed windows and doors. They are also supplied with brass casement stays. You can still choose to have our brass fixings with our styrene glazed windows and doors if you are looking for a more premium finish.

  • UPVC Fixings

    Our UPVC fixings are only available with our UPVC window option. Please select the UPVC Fixings to select our UPVC options in our three colour choices.

  • Standard Fixings
    £0
  • Premium Fixings
    £105 With Discount-10% £95
  • UPVC Fixings
    £120 With Discount-10% £108

5 Choose your window and glazing material

Please Note: Our Styrene Standard Modern Single Glazed windows are for seasonal use. Should you want to use your garden building all year round, please upgrade to our Toughened Glass Premium Modern Double Glazed windows.

Please note: UPVC will increase the lead time of the building. Please contact us before placing your order.

Details watch

X

  • UPVC Green

    Upgrade to UPVC Green for better security and a more premium look to your building.

  • UPVC Brown

    Upgrade to UPVC Brown for better security and a more premium look to your building.

  • UPVC White

    Upgrade to UPVC White for better security and a more premium look to your building.

  • UPVC Grey

    Upgrade to UPVC Grey for better security and a more premium look to your building.

  • Standard Modern Single Glazed
    £0
  • Premium Modern Double Glazed
    £405 With Discount-10% £365
  • UPVC White - with Glass Double Glazed Window
    £2,221 With Discount-10% £1,999
  • UPVC Green - with Glass Double Glazed Window
    £2,910 With Discount-10% £2,619
  • UPVC Grey - with Glass Double Glazed Window
    £2,910 With Discount-10% £2,619

6 Choose your floor

Details watch

X

  • Video

  • 11mm Floor

    Pressure treated 11mm tongue and groove Floor Boards. Standard option.

  • 19mm Floor

    Pressure Treated 19mm tongue and groove floor boards - select this option for medium use, if you intend on having furniture in the building and using occasionally.

  • 28mm Floor

    Pressure Treated 28mm tongue and groove floor boards. Select this option for Heavy use. This may include Gym/ heavy furniture use or heavy all year round use.

  • 11mm Floor
    £0
  • 19mm Floor
    £579 With Discount-10% £521
  • 28mm Floor
    £1,144 With Discount-10% £1,030

7 Choose your insulation

X

  • Insulation

    Our Insulation Option comes with all the parts you need to install insulation on your building's internal walls, roof and floor. We supply the parts as a kit that requires assembly with stage by stage assembly instructions.

    The building's walls, roof and floor are lined with our high-performance multi-foil insulation which is specially designed to lock in the air between the cavity inside the walls of your building. The trapped air creates a barrier between the outside temperature and the inside temperature.

    The multi-foil insulation is also a low profile which saves space inside your building so you can have a larger useable space inside. We also provide our primed and beaded smooth to the touch internal cladding giving the inside of your building a premium finish.

    The following parts are supplied in the Insulation Kit:

    • Primed and beaded MDF internal wall cladding panels
    • High-performance multi-foil insulation rolls
    • Timber wall and roof battens
    • Knife and sealing tape
    • Staple gun

  • none
    £0
  • Insulation
    £4,795 With Discount-10% £4,316

none

Product placeholder image
£0

8 Choose your roof cover

Details watch

X

  • Video

  • Mineral Felt

    Standard with all buildings.

  • Black Felt Tiles

    Select these to improve the aesthetic of your building. Available in black, Grey and Green.

  • Grey Felt Tiles

    Select these to improve the aesthetic of your building. Available in black, Grey and Green.

  • Green Felt Tiles

    Select these to improve the aesthetic of your building. Available in black, Grey and Green.

  • Rubber Roof

    Select this option for full lifetime (20 Year) protection. Saving time and money replacing standard felt.

  • Mineral Felt
    £0
  • Black Felt Tiles
    £385 With Discount-10% £347
  • Green Felt Tiles
    £385 With Discount-10% £347
  • Grey Felt Tiles
    £385 With Discount-10% £347
  • Rubber Roof
    £1,879 With Discount-10% £1,691

9 Choose your guttering

Details watch

X

  • Video

  • Guttering

    Adding guttering to your building is a great way to help reduce any water run-off down the sides of your building. This can help prevent any moisture ingress and any water pooling around your building, especially in particularly damp or exposed areas. You can also use your guttering to collect rainwater with a water butt, which is ideal if you have a lot of plants and need a lot of water during the dryer summer months.

    Our guttering option on an Apex roof building gives you guttering for both sides, whereas on a pent building you will only require guttering for the back of your building due to the mono-pitched roof.

  • None
    £0
  • Guttering
    £323 With Discount-10% £291

10 Choose your paint colour

Details watch

X

  • Doormouse

    Doormouse Paint

  • Doulting Stone

    Doulting Stone Paint

  • Foxwhelp Red

    Foxwhelp Red Paint

  • Goblin Blue

    Goblin Blue Paint

  • Moreland Green

    Moreland Green Paint

  • Rock Rose

    Rock Rose Paint

  • Sedge Green

    Sedge Green Paint

  • None
    £0
  • Doormouse Grey
    £326 With Discount-10% £293
  • Doulting Stone
    £326 With Discount-10% £293
  • Foxwhelp Red
    £326 With Discount-10% £293
  • Goblin Blue
    £326 With Discount-10% £293
  • Moorland Green
    £326 With Discount-10% £293
  • Sedge Green
    £326 With Discount-10% £293
  • Anthracite Grey
    £326 With Discount-10% £293

11 Choose your colour trim

Details watch

X

  • Swan White

    Swan White Trim Paint

  • Chantry Cream

    Chantry Cream Trim Paint

  • None
    £0
  • Swan White
    £63 With Discount-10% £57
  • Chantry Cream
    £63 With Discount-10% £57

12 Choose your laminate floor

Details

X

  • Laminated Floor Trend Oak Grey

    Choose from our laminated flooring options giving your buildings floor a clean and smooth surface and for a more professional look.

  • Laminated Floor Summer Oak Brown

    Our Laminated flooring comes in packs of 2.39m lengths along with underlay.

  • None
    £0
  • Laminated Floor - Trend Oak Grey
    £1,716 With Discount-10% £1,544
  • Laminated Floor - Summer Oak Brown
    £1,716 With Discount-10% £1,544

13 Choose your base

X

  • No Base

    Your building comes without a base as standard, where you will need to construct one from your own materials.

  • Project Timber Base

    The timber base we supply is made from pressure treated timber. It is made to measure to perfectly fit your building size.

    Some assembly is required and solid ground in the build area. Please ensure there is at least 1m clearance from any boundary on all sides.

  • None
    £0
  • Base
    £1,815 With Discount-10% £1,634

14 Choose your building assembly service

Details

X

  • Assembly Team

  • Assembly Service Postcodes

    We are currently only able to offer the service to limited postcodes – The postcodes for Assembly are AL, B, BB, BD, BL, BR, CB, CH, CM, CO, CR, CV, CW, DA, DE, DH, DL, DN, DY, E, EN, GU, HA, HD, HG, HR, HP, HU, HX, IG, IP, KT, L, LE, LN, LU, M, ME, MK, N, NE, NG, NN, NR, NW, OL, OX, PE, PR, RG, RH, RM, S, SG, SK, SL, SM, SN, SR, SS, ST, SW, TF, TS, TW, UB, W, WA, WD, WF, WN, WR, WS and YO. If you are outside the above postcodes we may be able to assemble at an extra charge.

    Call us for more information.

  • None
    £0
  • Building Assembly Service
    £3,020 With Discount-10% £2,718

£4,899

  • Wall Thickness, Window Fixings, Window and Glazing Material, Floor, Roof Cover, Guttering, Paint Colour, Colour Trim → Please choose an option.

Available for delivery in 5-10 working days.

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*.

High Quality Materials

Thicker & doubled up timber framing with shiplap construction.

15 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.

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.

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.

Free Delivery

Free Delivery

On selected postcodes

30 Days Returns

30 Days Returns

no-hassle returns

Made in our facility in Nottinghamshire

Made in our facility in Nottinghamshire

in the cusp of Sherwood Forest

5

Roof cover

A choice of roof covers for your preference and budget

Included
 

Mineral felt

Upgrade

Black roof tiles

Upgrade

Grey roof tiles

Upgrade

Green roof tiles

Pressure Treated Traditional Windowed Offset Grandmaster Workshop Shed

Pressure Treated Traditional Windowed Offset Grandmaster Workshop Shed

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.

    Select options
    SCROLL UP TO SEE YOUR BUILDING
    • Size
      Please Select..
    • Wall Thickness
      Please Select..
    • Window Fixings
      Please Select..
    • Window and Glazing Material
      Please Select..
    • Floor
      Please Select..
    • Insulation
      Please Select..
    • Roof Cover
      Please Select..
    • Guttering
      Please Select..
    • Paint Colour
      Please Select..
    • Colour Trim
      Please Select..
    • Laminate Floor
      Please Select..
    • Base
      Please Select..
    • Building Assembly Service
      Please Select..
            
    

            
    
                   
                
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                                                PRICE
                                                                                                                                                
                                                    
    £4,899
    
                                                
                        
    £4,409

    
                                                                                        
                
    
                
    Delivery from Tue 6 May*
         
                
                                
                                
                
                
                
                
                

                
            
    
        
    
    
    
    
    

    













		
	
    
		
	





     



   



    



    
    



        
    



            
    



                



            
    



            
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