This is a rough estimate to help you budget, not a quote. Real quantities depend on the layout, board direction and the joist spacing your boards need. Real prices depend on your site, access and design. For a fixed price, get a free on-site quote.
Each board covers its own width plus the gap beside it. A 90mm board with a 5mm gap covers 95mm, so a square metre of deck takes about 10.5 lineal metres of 90mm boards, or about 6.9 lineal metres of 140mm boards. The deck board estimator adds 10% for offcuts and waste, then divides by your board length to give a board count.
The joist count assumes boards run along the length of the deck, with joists running across it at typical centres: around 450mm for pine and hardwood, closer for composite, which is often 400mm or less depending on the brand. Bearers, piles and blocking are not included, because they depend on the deck height and span tables in NZS 3604.
The price uses the same indicative per-m² ranges as our deck cost guide, adjusted for height, plus balustrade per lineal metre and a range per flight of stairs. It does not include consent, removal of an old deck, or difficult sites.
This deck material estimator is for budgeting and DIY planning. If you want us to build it, we measure up on site and give you a fixed written price, so you are not relying on an estimate.
About 10.5 lineal metres of 90mm boards or about 6.9 lineal metres of 140mm boards per square metre, with a 5mm gap. Add around 10% for waste.
Commonly around 450mm centres for 32mm pine boards and many hardwoods, and closer for composite, often 400mm or less. Always follow the board manufacturer's spec.
It is a rough, deliberately wide guide based on typical NZ pricing. Your site, access, height and design can move the real price a long way. A site visit gives you a fixed price.
No. If your deck needs a building consent, drawings and council fees typically add around $1,500 to $4,000.
Free on-site quote. Fixed written price within 48 hours.
