Composite Decking Cost Calculator
Estimate the cost of a composite (wood-plastic) deck in Australia. Enter the deck size and height, then choose the board tier and extras.
Your composite decking details
Your estimate sits within the typical range.
Composite costs more than timber upfront but needs no oiling or staining, over 10 to 15 years it usually works out cheaper to own.
Where the money goes
Estimated breakdown for your configuration
💰 Ways to save
- Keep the deck shape simple and rectangular, angles and curves waste boards and add labour.
- A ground-level deck avoids the cost of a tall sub-frame, balustrade and steps.
or from $36/week over 5 years , indicative finance
How we estimate this
Composite decking in Australia typically costs $250 to $480 per square metre supplied and installed in 2026, so a 20m² deck lands around $5,000 to $9,500. Board tier, deck height and extras like railings drive the range.
Pricing reviewed: October 2026.
Doing more than just composite decking?
Build a combined estimate across every part of your project in one place.
Pricing reviewed October 2026. Indicative Australian costs, not a quote.
Understanding composite decking costs in Australia
Composite decking in Australia typically costs $250 to $480 per square metre supplied and installed in 2026, so a 20m² deck lands around $5,000 to $9,500. Board tier, deck height and extras like railings drive the range.
Composite costs more than timber to install but needs no sanding, oiling or staining, so over its life it is usually cheaper to own and far lower maintenance.
Frequently asked questions
How much does composite decking cost per m² in Australia?
Typically $250 to $480 per square metre supplied and installed in 2026, depending on board tier and deck height. A raised deck costs more due to the larger sub-frame.
Is composite decking cheaper than timber?
It costs more upfront but needs no oiling or staining, so over 10 to 15 years composite is usually cheaper to own than timber once maintenance is counted.
Are you a outdoor / landscaping business?
Everyone on this page is working out what composite decking costs because they are ready to hire. Put your business right beneath the calculator, in your state, so you are who they find. From $50/mo.