Deck Cost Calculator
Instant indicative pricing for Australian decks, based on current Sydney-metro installed rates. Pick a material, set your size, and see the range — then see the actual deck on your own backyard photo.
Material
Deck size: 20 m²
Project
Indicative installed cost (Sydney metro)
$3,600 – $5,000
Based on $180–$250/m² including subframe
Decking cost FAQs
How much does decking cost per m² in Sydney?
Installed decking in Sydney metro typically runs $90–$150/m² for treated pine, $180–$250/m² for merbau, $190–$260/m² for spotted gum, and $200–$350/m² for composite boards, including the subframe. Elevated decks, complex sites and premium balustrades add to this.
How much does a 20m² merbau deck cost?
A straightforward 20m² merbau deck usually lands between $3,600 and $5,000 installed in Sydney metro. Add steps, balustrades or height and the range moves up.
Is restoring a deck cheaper than rebuilding?
Yes — professionally sanding and re-oiling an existing structurally sound deck typically costs 30–40% of a rebuild, because the boards and subframe stay.
How accurate is this calculator?
It uses current indicative Sydney-metro installed rates. Your site access, deck height, railing choice and design details all move the final price — treat it as a starting range and get builder quotes for a firm number.
Numbers are nice. Seeing it is better.
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Visualise It On My Photo →Related reading: How much does a deck cost in Sydney? · Merbau vs composite decking