Decking Project Estimator
Calculate decking boards, joists, posts, screws and ground preparation materials for a complete deck build.
Decking materials for a 3.6m by 2.4m deck
For a deck measuring 3.6 metres by 2.4 metres, this estimate recommends 19 boards (3.6m lengths) plus joists at 400mm centres, 150mm noggins, posts, screws, weed membrane and sub-base using the default 2026 UK assumptions shown below.
- Deck area8.64 m²
- Deck boards19 boards (3.6m lengths)
- Joists7 joists / 25.20 lm
- Noggins6 pieces (150mm timber)
- Posts6 posts
- Structural bolts12 bolts
- Decking screws262 screws
- Weed membrane9.50 m²
- Sub-base0.86 m³ / 1.56 tonnes
Results - Decking Project Estimator
- Deck area8.64 m²
- Deck boards19 boards (3.6m lengths)
- Joists7 joists / 25.20 lm
- Noggins6 pieces (150mm timber)
- Posts6 posts
- Structural bolts12 bolts
- Decking screws262 screws
- Weed membrane9.50 m²
- Sub-base0.86 m³ / 1.56 tonnes
How this decking estimator works
This estimator builds a practical bill of materials for a ground-level deck using common 2026 UK assumptions: decking laid over joists at 400mm centres, 150mm noggins, two structural bolts per post, plus weed membrane and sub-base for ground preparation. Pick a board length of 2.4m, 3.6m or 4.8m and choose a wastage allowance of 5%, 10% or 15% depending on how simple or complex your layout is.
Popular sizes
These decking presets cover the board-and-joist sizes people actually price up for garden platforms, seating areas and raised decks.
Garden decking searches usually revolve around standard entertainment areas, hot tub surrounds and raised seating platforms. Pages such as 2.4m × 1.8m, 3m × 1.8m, 2.4m × 2.4m, 3.6m × 1.8m create direct landing pages for board counts, joists, posts, screws and ground preparation materials.