Decking Cost Perth — 2026 Timber & Composite Price Guide
Everything you need to budget for a new deck in Perth, from material costs to installation and ongoing maintenance.
Decking Cost by Material
Installed prices per square metre including subframe, fixings, and standard finishing for Perth residential projects in 2026.
| Material | Cost per m² | Maintenance | Lifespan |
|---|---|---|---|
| Treated Pine | $300 -- $400 | High (annual oil) | 10--20 years |
| Merbau | $400 -- $550 | Medium (annual oil) | 25--40 years |
| Jarrah | $450 -- $600 | Medium (annual oil) | 30--40 years |
| Spotted Gum | $400 -- $550 | Medium (annual oil) | 25--40 years |
| Standard Composite | $350 -- $550 | Very low (wash only) | 25--50 years |
| Premium Composite | $550 -- $800 | Very low (wash only) | 25--50 years |
Additional Decking Costs
The per-square-metre rates above cover basic deck construction. The following extras are common additions:
- Stairs: $300 -- $800 per set depending on height and material
- Balustrades: $150 -- $400 per lineal metre (glass, wire, or timber)
- Built-in seating: $200 -- $500 per lineal metre
- Elevated deck (over 500mm): Add 20--40% for additional subframe and engineering
- Demolition of old deck: $30 -- $60/m² including disposal
- Annual timber oiling: $5 -- $15/m² (DIY) or $15 -- $30/m² (professional)
Perth Decking Considerations
Perth's climate presents specific considerations for decking that affect both material choice and cost:
- Extreme UV exposure:Perth receives some of Australia's highest UV levels. Timber decks need quality UV-rated oil applied annually. Composite boards with UV-stabilised caps perform best long-term.
- Heat retention: Dark-coloured composite decking can become uncomfortably hot underfoot in Perth summers. Lighter colours or capped composites with heat-reduction technology are worth the premium.
- Termite protection: Perth has active termite populations. Steel subframes add 10--15% cost but eliminate termite risk entirely. Alternatively, chemical barriers and termite-resistant timber species (like jarrah) provide protection.
- Sandy soil footings: Deck posts in Perth sandy soil may require deeper concrete footings than clay-based soils, though excavation is easier and faster.
Disclaimer: All prices are indicative for the Perth metro area in 2026. Actual costs depend on site conditions, deck specifications, and contractor rates. Always obtain multiple written quotes.
Frequently Asked Questions
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