How much does deck building & repair cost in Australia?
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Key takeaways
- Most deck building & repair jobs in Australia land between A$300–A$28,000 — known locally as timber decking (decks and pergolas).
- Deck building is licensed residential building work in most Australian states once the value passes the state threshold (from $3,300 in QLD). Balustrades are mandatory above 1m fall height under the NCC, and bushfire-prone areas impose BAL-rated material restrictions.
- Prices below are researched national ranges, updated July 2026 — not quotes.
Deck Building & Repair prices by job size in Australia
| Job size | Low | Typical | High |
|---|---|---|---|
| Repair and re-oil Replace boards, re-fix balustrade, sand and oil | A$300 | A$800 | A$1,500 |
| Small deck (15m²) Low-set treated pine or Merbau deck | A$4,000 | A$7,500 | A$12,000 |
| Large or elevated deck 30m²+ hardwood or composite deck with balustrade and stairs | A$10,000 | A$17,000 | A$28,000 |
Per-unit rates
| Unit | Low | Typical | High |
|---|---|---|---|
| per m² (installed, treated pine) | A$200 | A$320 | A$500 |
What affects the price
- Job size and scope — bigger or more complex jobs move you up the ranges above.
- Access and condition — hard-to-reach areas, older properties or neglected maintenance add labour time.
- Materials and quality level — where materials are involved, the grade you choose often matters more than labour.
- Urgency — same-day or out-of-hours work usually carries a premium.
- Where you live — large metros in Australia typically run above the national range; smaller towns below it.
How to save
- Get at least three quotes and compare like-for-like scopes, not just totals.
- Be flexible on timing — off-peak slots are often cheaper.
- Bundle related tasks into one visit to spread call-out costs.
- Agree the scope in writing up front to avoid change-order surprises.
How to hire a deck building & repair pro in Australia
- Check state licensing: in NSW a contractor licence is required for residential building work over $5,000; in QLD a QBCC licence applies over $3,300; in VIC registered building practitioners are required for major domestic work
- Ask whether a building permit/development approval is needed — decks above ~1m or attached to the dwelling usually require one
- Confirm termite management: H3-treated pine or naturally durable hardwood for framing
- Get board species in writing (treated pine, Merbau, Spotted Gum, composite) — prices differ sharply
- Ask for home warranty insurance where the job value triggers it (e.g. over $20,000 in NSW/VIC)
- Request photos and addresses of decks built 3+ years ago
Red flags
- Unlicensed for a job over the state licence threshold
- No termite protection strategy for posts and framing
- Quotes 'Merbau' without a per-lineal-metre board spec
- Deposit demanded above the state cap (e.g. 10% in NSW for jobs over $20k)
- No mention of balustrade requirements for decks over 1m
How Handld researches prices
These are researched estimates, not quotes and not our transaction data. We compile ranges from published sources — national statistics, trade bodies and incumbent cost guides — normalise them to AUD, and adjust city pages by a population-based cost tier. Last updated July 2026. Basis: hipages decking cost guide; ServiceSeeking price reports.
Frequently asked questions
Composite vs timber decking — which is cheaper long-term?
Timber is cheaper to install but needs sanding, staining or oiling every 1-3 years. Composite costs 50-100% more upfront but only needs washing. Over 10-15 years the totals often converge, so the decision usually comes down to upfront budget and how much maintenance you will actually do.
How often should a timber deck be stained or oiled?
Every 12-24 months for oil finishes and 2-4 years for film-forming stains, depending on sun exposure. Re-coating on schedule is the single biggest factor in how long the boards last.
How much does it cost to build a deck?
Deck cost is driven by area, height off the ground, and material. Ground-level softwood decks are the cheapest; elevated decks need engineered footings and balustrades, and composite or hardwood boards can double the board cost. Most quotes are priced per square metre or square foot, with stairs, balustrades and lighting as line items.
Can an old deck be repaired instead of replaced?
If the frame (joists, bearers, posts) is sound, boards and balustrades can be replaced individually and the structure re-stained for a fraction of a rebuild. If posts are rotting at the base or the ledger connection to the house is corroded, replacement is usually safer and not much more expensive than piecemeal repair.
What deck size do most homeowners build?
The most common residential decks fall between 12-25 m² (130-270 sq ft) — enough for a table, chairs and a grill. Costs do not scale perfectly with area: small decks carry fixed costs (access, footings, delivery), so price per square metre drops as size grows.
How long does a deck build take?
A simple ground-level deck takes 2-4 days. An elevated deck with footings, stairs and balustrades typically takes 1-2 weeks, plus any permit or inspection lead time before work can start.
Is Merbau still the default decking timber in Australia?
It remains the most-quoted hardwood because of durability and price, but sustainability concerns push many builders toward Spotted Gum, Blackbutt or composite. Expect treated pine to be cheapest, Merbau mid-range, and Australian hardwoods or premium composite 40-80% above Merbau.
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