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Deck and Pergola Cost Guide, Australia 2026

Price ranges based on current Australian market rates. Actual costs depend on materials, site conditions, and your location.

Decking cost by material

Treated pine$200–$280/m²

Most affordable option. Needs periodic oiling and treatment to prevent rot.

Hardwood (Merbau)$300–$400/m²

Durable and attractive. A popular mid-range choice in Australia.

Composite$350–$600/m²

Low maintenance, no oiling needed. Higher upfront cost, lower long-term cost.

Typical total project costs

Small deck (10–20m²)$3,500–$6,000

Ground-level, treated pine, basic design.

Mid-size deck (25–40m²)$5,000–$10,000

Hardwood or composite, some steps included.

Large deck (50m²+)$10,000–$20,000+

Premium materials, elevated with balustrades, complex design.

Pergola (freestanding)$8,000–$20,000

Timber or aluminium, open or roofed. Custom louvred roofs sit at the higher end.

What affects the price

  • ·Height from ground: Elevated decks need more complex footings and must have balustrades by code, adding $180–$320 per linear metre.
  • ·Roof type: An open pergola is the cheapest option. A pitched Colorbond roof adds cost, and motorised louvres sit at the top end.
  • ·Site conditions: Sloped ground or poor soil adds to footing costs. Rock removal is charged separately.
  • ·Council approval: Most structures over 10m² need a building permit. Permit costs vary by council but typically run $300–$1,500.
  • ·Location: NSW carpenter rates run $200–$210/hour versus $170–$180/hour in WA.

Common questions

Do I need council approval for a deck or pergola?

In most states, structures over 10m² or taller than 2.4m require a building permit. Thresholds vary by council. Always check before starting work — building without approval can result in orders to remove the structure.

What decking material is most popular in Australia?

Treated pine is still the most common choice due to its lower upfront cost. Composite has grown in popularity for its low maintenance. Merbau hardwood remains a go-to for homeowners after a natural, premium finish.

How long does a deck last?

Treated pine lasts 15–25 years with regular maintenance. Hardwood can last 25–40 years. Quality composite decking typically carries a 25-year manufacturer warranty and needs little beyond an occasional wash.

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