Decking Cost Calculator & Price Guide
Use this decking cost calculator to estimate what you might pay for a new deck or a refresh of an existing one in Australia. Typical pricing starts from $55/m² for a clean and oil restoration and goes up to $440/m² for premium composite decking installation, making it easier to compare timber decking cost, composite decking cost and deck restoration cost in AUD.
Estimate decking cost
Rough guide based on Australian averages. Toggle restore vs new install, then refine by finish, material and extras. Real quotes vary by site access, structure and contractor.
Set to 0 to exclude. Balustrade count is linear metres.
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Decking Price Breakdown
Typical job based on 30 m². Prices are supply-and-install midpoints — actual quotes will vary.
| Type | Cost per m² | Typical 30 m² job |
|---|---|---|
| Clean & oil | $55 | $1,650 |
| Sand & restain | $90 | $2,700 |
| Partial board replace + restain | $150 | $4,500 |
| Softwood (treated pine) (timber) | $240 | $7,200 |
| Hardwood (timber) | $375 | $11,250 |
| Standard composite (composite) | $330 | $9,900 |
| Premium composite (composite) | $440 | $13,200 |
What Affects Decking Cost?
- Project type: restoration or new installation: The biggest cost difference is whether you are restoring an existing deck or building a new one. Restoration starts at $55/m² for clean and oil, while new installations begin at $240/m² for softwood timber and can reach $440/m² for premium composite.
- Decking material and finish level: Material choice has a major impact on decking cost per m2. Treated pine timber is priced at $240/m², hardwood at $375/m², standard composite at $330/m² and premium composite at $440/m², while restoration scope ranges from light cleaning through to board replacement and restaining.
- Repairs to existing decking: If you are restoring rather than replacing, repair needs can raise the cost to restore a deck. Where repairs are required, add $30/m² on top of the selected restoration finish rate.
- Extras like stairs, balustrades and screening: Optional features can increase the total quote beyond the base deck area. Stairs add $2,000, privacy screening adds $1,200, and balustrade is priced at $180.
Decking Cost - Frequently Asked Questions
The calculator uses a per-square-metre rate based on the type of job you choose: restoration, new timber installation or new composite installation. Rates range from $55/m² for a basic clean and oil up to $440/m² for premium composite supply and install, with a displayed estimate range of ±15% around the midpoint. Minimum charges apply at $1,200 for restoration jobs and $5,000 for new installs when the calculated amount is lower.
For a 30 m² deck, clean and oil comes to $1,650 at $55/m², sand and restain comes to $2,700 at $90/m², and partial board replace plus restain comes to $4,500 at $150/m². If the deck also needs repairs, add $30/m², which would add $900 to a 30 m² restoration job. These figures are before optional extras such as stairs, balustrade or privacy screening.
Yes — start with the restoration finish rate, then add $30/m² if repairs are needed. For example, a 30 m² sand and restain job is $2,700, and with repairs it becomes $3,600. A 30 m² partial board replace and restain job is $4,500 before any optional add-ons.
Timber decking installation cost depends on the species selected. Treated pine softwood is $240/m² supplied and installed, while hardwood such as merbau or similar is $375/m². On a typical 30 m² deck, that works out to $7,200 for softwood or $11,250 for hardwood, before extras.
Composite decking cost per m2 starts at $330/m² for standard composite and rises to $440/m² for premium composite. For a 30 m² project, that means a composite decking installation cost of $9,900 for standard boards or $13,200 for premium boards. These prices cover supply and installation.
Common add-ons include stairs at $2,000, privacy screening at $1,200 and balustrade at $180. These are added on top of the base deck price, whether you are estimating timber decking cost, composite decking cost or deck restoration cost. They can make a noticeable difference to the final total, especially on larger or more complex projects.
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