Cost Guide · 2026

Deck Cost Guide
Australia

What it costs to build a deck in Australia — by material, by size, and broken down so you can quote confidently.

MaterialSupply/m²Install/m²Total est./m²Lifespan
Treated pine (H3)$35–$55$60–$90$95–$14515–25 years
Merbau hardwood$65–$100$75–$95$140–$19525–40 years
Composite decking$90–$140$70–$90$160–$23025–30 years
Spotted gum$80–$120$80–$100$160–$22030–50 years

For a full interactive calculator, see the Deck Cost Calculator →

Skip the manual work

Quote deck jobs with accurate timber pricing in FMN.

Frequently asked questions

How much does it cost to build a deck per square metre in Australia?

Treated pine decks cost $95–$145/m² supplied and installed. Hardwood (merbau) runs $140–$195/m². Composite decking is $160–$230/m². Elevated decks with balustrades cost significantly more.

Do I need council approval to build a deck?

Most states exempt decks under 10m² from development approval. Over 10m² or elevated structures generally require a building permit or DA. Check with your local council before starting.