Decking Calculator online

Use our Decking Calculator to help you determine how many deck boards, edge trims and accessories you need for your next project. Choose from our FSC-certified traditional timber decking, architectural timber decking or low-maintenance composite decking made from 95% recycled plastics.

Choose your shape:

Enter your dimensions:

a (m)

b (m)

c (m)

d (m)

e (m)

f (m)

g (m)

h (m)

We recommend having 10% wastage to allow for those awkward angles and to make sure you don't come up short

Wastage (%)

The gap allowance is the distance side by side between each board. This is a fixed value to allow for shrinkage between the seasons and is the gap you'll have once clips are assembled.

Gap allowance (mm)

Please select which type of board you want to use:

URBAN Composite Decking Boards

Select

IRO Timber Decking Boards

Select

Habitat+ Composite Decking Boards

Select

Smooth & Grooved Timber Decking Boards

Select

Please select the board colour/size

URBAN Composite Deck Board | 3.6m x 138mm x 22mm | Arran

Select

URBAN Composite Deck Board | 3.6m x 138mm x 22mm | Mull

Select

URBAN Composite Deck Board | 3.6m x 138mm x 22mm | Jura

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Charcoal

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Driftwood

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Mountain

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Dolphin

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Natural

Select

Habitat+ Composite Deck Board | 3.6m x 135mm x 22mm | Rydal

Select

Habitat+ Composite Deck Board | 3.6m x 135mm x 22mm | Grizedale

Select

Habitat+ Composite Deck Board | 3.6m x 135mm x 22mm | Bowness

Select

Timber Deck Board | 3.6m x 150mm x 32mm | Green Treated

Select

Timber Deck Board | 4.8m x 150mm x 32mm | Green Treated

Select

Please select which sides you would like to add skirting trim:

Select All Sides

Side A

Side B

Side C

Side D

Side E

Side F

Side G

Side H

URBAN Composite Skirting Trim | 2.4m x 100mm x 15mm | Arran

Select

URBAN Composite Skirting Trim | 2.4m x 100mm x 15mm | Jura

Select

URBAN Composite Skirting Trim | 2.4m x 100mm x 15mm | Mull

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Charcoal

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Dolphin

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Driftwood

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Mountain

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Natural

Select

Habitat+ Composite Skirting Trim | 2.4m x 100mm x 15mm | Grizedale

Select

Habitat+ Composite Skirting Trim | 2.4m x 100mm x 15mm | Rydal

Select

Habitat+ Composite Skirting Trim | 2.4m x 100mm x 15mm | Bowness

Select

Timber Deck Board | 3.6m x 150mm x 32mm | Green Treated

Select

Timber Deck Board | 4.8m x 150mm x 32mm | Green Treated

Select

Please select which sides you would like to edge:

Select All Sides

Side A

Side B

Side C

Side D

Side E

Side F

Side G

Side H

URBAN Composite Edge Board | 3.6m x 136mm x 22mm | Arran

Select

URBAN Composite Edge Board | 3.6m x 136mm x 22mm | Jura

Select

URBAN Composite Edge Board | 3.6m x 136mm x 22mm | Mull

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Charcoal | Edge Board

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Dolphin | Edge Board

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Driftwood | Edge Board

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Mountain | Edge Board

Select

IRO Timber Deck Board | 4.8m x 145mm x 28mm | Natural | Edge Board

Select

Habitat+ Composite Deck Board | 3.6m x 135mm x 22mm | Grizedale

Select

Habitat+ Composite Deck Board | 3.6m x 135mm x 22mm | Rydal

Select

Habitat+ Composite Deck Board | 3.6m x 135mm x 22mm | Bowness

Select

Smooth & Grooved Timber Edge Boards | 3.6m x 150mm x 32mm | Green Treated

Select

Smooth & Grooved Timber Edge Boards | 4.8m x 150mm x 32mm | Green Treated

Select

Please select if you require joists:

Easi Edge | C16 Graded Timber | 3.6m x 45mm x 145mm

Select

Easi Edge | C16 Graded Timber | 4.8m x 45mm x 145mm

Select

Kiln Dried C24 Timber | 3.6m x 47mm x 150mm | Treated Timber

Select

Kiln Dried C24 Timber | 4.8m x 47mm x 150mm | Treated Timber

Select

Easi Edge | C16 Graded Timber | 3.6m x 45mm x 145mm

Select

Easi Edge | C16 Graded Timber | 4.8m x 45mm x 145mm

Select

Kiln Dried C24 Timber | 3.6m x 47mm x 150mm | Treated Timber

Select

Kiln Dried C24 Timber | 4.8m x 47mm x 150mm | Treated Timber

Select

Easi Edge | C16 Graded Timber | 3.6m x 45mm x 145mm

Select

Easi Edge | C16 Graded Timber | 4.8m x 45mm x 145mm

Select

Kiln Dried C24 Timber | 3.6m x 47mm x 150mm | Treated Timber

Select

Kiln Dried C24 Timber | 4.8m x 47mm x 150mm | Treated Timber

Select

Kiln Dried C24 Timber | 4.8m x 47mm x 150mm | Treated Timber

Select

Kiln Dried C24 Timber | 3.6m x 47mm x 150mm | Treated Timber

Select

Easi Edge | C16 Graded Timber | 3.6m x 45mm x 145mm

Select

Easi Edge | C16 Graded Timber | 4.8m x 45mm x 145mm

Select

In order to build your deck, you require the following extras. We have calculated how much of each product is required based on your deck size

Colour Matched Decking Screws | Arran | 25 Pack

£13.09 inc VAT

Colour Matched Decking Screws | Mull | 25 Pack

£9.99 inc VAT

Colour Matched Decking Screws | Jura | 25 Pack

£8.49 inc VAT

BSW Hidden Decking Clips | 100 Pack

£27.99 inc VAT

BSW Decking Starter Clips | 25 Pack

£28.65 inc VAT

C2 Decking Screws | 4.5mm x 65mm | 250 Pack | TIMco

£13.76 inc VAT

BSW Hidden Decking Clips | 100 Pack

£27.99 inc VAT

BSW Decking Starter Clips | 25 Pack

£28.65 inc VAT

Colour Matched Decking Screws | Arran | 25 Pack

£13.09 inc VAT

Colour Matched Decking Screws | Jura | 25 Pack

£8.49 inc VAT

Colour Matched Decking Screws | Mull | 25 Pack

£9.99 inc VAT

Selected shape and dimensions:

Surface area

Boards required

4m Structural Composite Joist

£ inc VAT

Total square meters:

m²

Linear meters:

Gap allowance:

The gap allowance is the distance side by side between each board. This is a fixed value to allow for shrinkage between the seasons and is the gap you'll have once clips are assembled.

Wastage:

We recommend having 10% wastage to allow for those awkward angles and to make sure you don't come up short

Total Cost:

£ inc VAT

Decking Calculator online

Shape and dimensions

Choose a board type

Choose a board colour/size

Skirting trim

Edge board

Joists

Required extras

Order summary

Total Cost:

Location

Opening Times

Useful Links

Categories