Enter your deck size and pick the board. You get boards, joists, posts, hangers, screws and membrane, ready to price.
Board width
Board length
Joist centres
Deck area
12.0 m²
Rows of boards
21
Boards (+10%)
26
Joists
11 at 400mm
Posts
12
Screws
2 boxes
Shopping list
26 x Treated Decking Board 144 x 28mm x 3.6m
15 x C24 Treated Carcassing 47 x 150mm x 3.0m
12 x Fence Post 100 x 100mm x 2.4m Treated
24 x Postcrete / Post Fix 20kg
3 x Joist Hangers 47 x 150mm (Pack of 10)
2 x Decking Screws Green 4.5 x 60mm (Box of 250)
1 x Weed Control Membrane 1.5m x 25m
Ground-level frame on posts about every 1.8 m, 5 mm board gaps, two screws per board at each joist. Raised decks over 600 mm need different framing — check with Building Control.
How it works
1Measure the length the boards will run and the width the joists will span.
2Pick your board width and length. Longer boards mean fewer joins.
3Choose joist centres: 400mm feels firmer, 600mm uses less timber.
4Add the shopping list to your materials list and compare prices.
Take your quantities across to Price Planter and compare them across UK builders' merchants — including whether splitting the order across two merchants works out cheaper.