How Much Does It Cost to Build a Deck in Australia? (2026 Prices)

Building a deck in Australia typically costs $200–$350 per m² for hardwood and $180–$280 per m² for treated pine, supplied and built. A typical 20 m² deck runs about $4,000–$7,000, while a large or elevated deck with a roof or stairs can be $15,000+. Timber species, height and substructure drive the price.

How much does a deck cost?

• Treated pine decking: $180–$280/m²
• Hardwood (merbau, spotted gum): $200–$350/m²
• Composite decking: $250–$420/m²
• Typical 20 m² deck: $4,000–$7,000
• Elevated deck, stairs or roof: add $3,000–$15,000+

What affects the price

• Timber species: treated pine is cheapest; hardwood and composite cost more but last longer.
• Height and substructure: a low ground-level deck is far cheaper than an elevated one needing tall posts, bearers and balustrade.
• Site access and ground: sloping or hard-to-reach yards add labour.
• Extras: stairs, balustrade, a roof or pergola, and finishing (oil/stain) all add up.
• Approvals: decks over a certain height need council approval and engineering.

How to get an accurate decking quote

Ask for the quote to specify the timber species and grade, the substructure, and whether stairs, balustrade and finishing are included — "merbau decking" and "treated pine" are very different prices. A carpenter using Insta Quotes can price the timber, substructure and labour to current Australian rates and send an itemised quote on-site.

Related guides

• How to Quote a Carpentry Job: Australian Carpenter's Pricing Guide
• How to Price a Job as a Tradie
• How to Write a Trade Quote in Australia

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