Building a deck? Timber choice is the biggest cost decision. Complete comparison of merbau, spotted gum, treated pine & composite — including installation labour and lifespan.
Decking Timber Costs (Material Only)
Treated Pine $55–$80/m²\nMerbau $85–$120/m²\nSpotted Gum $110–$150/m²\nBlackbutt $100–$140/m²\nComposite $140–$200/m²
Full Installation Costs (20m² Deck)
- Treated Pine: $3,500–$5,000
- Merbau: $5,500–$7,500 (best value)
- Spotted Gum: $7,000–$9,500 (premium)
- Composite: $8,500–$11,500
Lifespan & Best Value
Treated Pine: 15–20 yrs → $222/yr\nMerbau: 25–35 yrs → $217/yr\nSpotted Gum: 40–50 yrs → $178/yr ← BEST VALUE
Our Recommendation
Merbau for most homeowners — best all-round value. Spotted Gum if you want the best long-term investment. Treated Pine for budget or investment properties.
🧮 Calculator
Use our Decking Calculator to estimate materials and cost.