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Free tool · NZ deck costsHow much will the deck cost? Priced by a real engine
A free NZ deck cost calculator that isn’t a flat $/m² guess: the figure comes from the same deck engine builders quote with, at your labour rate, including GST.
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NZ deck cost calculator
Pick the size, height and decking. The figure below comes from Toolie’s own deck engine — the one that prices real quotes in the app — not a flat per-square-metre rate. It builds the NZS 3604-style take-off (piles, bearers, joists, boards, fixings, balustrade and steps where they apply), adds NZ merchant prices, your labour rate, margin and GST.
Example, so you can see what you get: a 6 × 4 m deck, 600 mm high, treated pine, at $85/h comes to $10,884 including GST ($453 per m², about 47.5 labour hours). The calculator updates as you change the boxes above.
Estimate, not a quote. Sizes between the engine’s whole-metre steps are interpolated; in our spot checks against the engine’s own price for the exact size the result was usually within 2% and occasionally up to about 9% on small or awkward sizes, and a deck outside 3–12 m by 2–6 m is shown at the nearest size. Excludes consent, design and engineering fees, council charges, site clearing and difficult access.
What does a deck cost per m² in NZ?
There is no single rate, which is why a calculator that only multiplies area by a number is unreliable. Using the same engine, a 5 × 4 m deck comes out like this:
| Deck | Treated pine 140 × 32 | Kwila | Vitex | Composite |
|---|---|---|---|---|
| Ground level, free-standing | $511 | $636 | $690 | $632 |
| 600 mm high, fixed to the house | $489 | $615 | $668 | $611 |
| 1.2 m high, with steps | $852 | $975 | $1,029 | $971 |
| 2.4 m high (a first-floor-height deck) | $806 | $929 | $983 | $925 |
Read across and the decking you choose moves the price; read down and the height moves it more. A ground-level deck is a free-standing build, so it can price a little above a 600 mm deck fixed to the house. A deck 1.2 m or more above the ground needs a balustrade (NZBC F4 treats a fall of 1 m or more as a barrier job) and steps, and a high one needs more framing and bracing. A 6 × 4 m pine deck at 600 mm is about $10,884; the same deck in kwila is about $13,842, in composite about $13,806, and at 1.2 m with steps in pine about $18,528 (all including GST, at $85/h).
What is (and isn’t) in the number
- In: piles, bearers, joists, decking boards and fixings, balustrade above the barrier height, steps if you tick them, wastage, delivery, consumables, labour at your rate, margin, 3% contingency and GST. Material prices are the app’s default NZ merchant prices and move with your own price book in Toolie.
- Not in: building consent and design fees, engineering for a deck that needs it (for example an attached deck projecting more than 2 m from the house needs bracing checks under NZS 3604), site clearing, retaining, skirting and screening (the Design Studio prices skirting and access hatches), lighting, oiling or staining the boards, and anything specific to your site.
- Your rate matters: labour is more than a third of the price. Change the charge-out box to your own rate; the engine’s result is exactly linear in it.
Get the real price for your deck
A calculator can only guess the shape of your deck. In Toolie you can draw the deck to scale in the Design Studio, see it in 3D, and get the live price (and a quote on the job) from the same engine. Builders can quote a deck free in the no-sign-up demo, or read how deck design software and the 3D visualiser work.
See your deck in 3D
Draw it in the Design Studio or show it on the house with the 3D visualiser.
Common questions
How much does a deck cost in NZ?
From the Toolie deck engine at $85/h labour including GST: a 6 x 4 m treated-pine deck 600 mm high is about $10,884, the same deck in kwila about $13,842 and in composite about $13,806; at 1.2 m with steps in pine it is about $18,528. Height, decking, steps, balustrade and your labour rate all move it. Excludes consent and design fees.
Is this a quote?
No. It is an estimate interpolated between sizes the engine priced, with default NZ merchant prices. For a firm price, draw the deck in the Toolie Design Studio or run it through the Quote Builder, which uses your own price book, your site (wind zone, coastal) and your margin.
What does a 1.2 m high deck need?
A deck with a fall of 1 m or more is a barrier job under NZBC F4, so the price includes a balustrade, and higher decks need more framing and bracing. Toolie's Brain also raises a working-at-height task analysis for it.
Why is a ground-level deck not always the cheapest?
Because it is a different build: free-standing, with its own bearer and pile arrangement, rather than a 600 mm deck fixed to the house. The engine prices each one as built, so a small difference either way is normal.
Does the price include GST and consent?
It includes GST at 15% and a 3% contingency. It does not include building consent, design or engineering fees, or council charges.
Can I use my own labour rate?
Yes. Type your charge-out rate in dollars per hour excluding GST. Labour is a large part of a deck price, and the result moves in exact proportion to the rate.
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