Complete decking material list — joists, deck boards, posts, fixings and concrete — from the deck dimensions.
You get joist quantity and total length, the linear metres of decking boards, the number of support posts on a 1.5 m grid, the concrete for setting those posts, and an approximate screw count. Add joist hangers, a ledger board and post anchors to suit your design.
For most timber decking, joists at 400 mm centres are standard. Reduce to 300 mm if you lay boards diagonally or use thinner boards.
Plan for two screws at every point a board crosses a joist. Our estimate uses that rule — buy a little extra to be safe.
As a guide, set posts in holes about 600 mm deep with roughly 0.03 m³ of concrete each, deeper for tall or raised decks.
400 mm (16 in) centres is standard for most decking; 600 mm (24 in) can be used for thicker boards. Closer spacing gives a firmer, less bouncy deck.
Yes, allow about 10% for cuts and the occasional damaged board — more for diagonal or herringbone patterns.
Full material list for a timber shed — floor, framing, cladding, roof sheathing, felt and fixings — from the shed size and roof style.
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