A deck is one of the highest-value additions you can make to an Australian home. It extends the living space outdoors for most of the year, suits the indoor-outdoor lifestyle buyers love, and consistently ranks among the renovations with the strongest return on investment. But the question everyone asks first is the hardest to answer simply: how much does a deck actually cost?
The honest answer is that it depends enormously — on size, height off the ground, material, site access and whether you DIY or hire a tradie. A small treated-pine platform can cost a few thousand dollars; a large elevated hardwood entertainer with roofing can run into the tens of thousands. This 2026 guide breaks down realistic Australian cost ranges, what drives the price up or down, and how to budget wisely.
2026 Cost Ranges: What Australians Are Paying
All figures below are estimates for professionally installed decks in 2026, including materials and labour, and will vary by city, site conditions and finish level. Use them for budgeting, not quoting.
Treated Pine Decking
Treated pine is the budget workhorse: roughly $250–$400 per square metre installed for a straightforward ground-level deck. A 20 sqm pine deck therefore lands around $5,000–$8,000. Pine needs the most maintenance — restaining or oiling every 1–2 years — but the upfront saving is substantial.
Hardwood Decking
Australian hardwoods like spotted gum, blackbutt and merbau (imported) are the premium natural choice: roughly $400–$650 per square metre installed. That 20 sqm deck becomes $8,000–$13,000. Hardwood lasts decades, looks superb, and needs only periodic oiling to keep its colour — or can be left to silver off naturally.
Composite Decking
Composite boards (wood-plastic blends) sit in the middle to upper range: roughly $450–$700 per square metre installed. The selling point is near-zero maintenance — no staining, no splinters, no rot — and long warranties. Quality varies significantly between products, so buy from established suppliers and check the warranty terms carefully, particularly regarding fading in harsh Australian UV.
Materials vs Labour: Where the Money Goes
As a rough rule, materials account for 40–50% of a professionally built deck's cost and labour the rest. For a mid-range 20 sqm hardwood deck at $10,000, expect something like $4,000–$5,000 in timber, fasteners, stumps and concrete, and $5,000–$6,000 in labour.
Labour rates for deck builders and carpenters vary by state, with Sydney and Melbourne typically dearer than regional areas. Complex sites — steep blocks, poor access, rocky ground requiring deeper footings — push labour costs up because everything takes longer.
Factors That Push the Price Up
- Height off the ground. A low platform deck is simple; an elevated deck needing tall stumps, bracing and scaffolding costs far more per square metre.
- Stairs. Each set of stairs adds roughly $500–$2,000+ depending on width, height and material.
- Balustrades and handrails. Required by the Building Code for decks more than 1 metre above ground, adding $150–$400+ per linear metre depending on material — glass is the premium option.
- Roofing or pergola cover. A simple shade sail is a few hundred dollars; a proper insulated patio roof can add $5,000–$15,000+.
- Built-in extras. Bench seating, planter boxes, lighting and privacy screens all add cost — budget $500–$3,000+ per feature.
- Site access. If materials must be carried through the house or up steep slopes by hand, labour time balloons.
- Demolition. Removing an old deck typically adds $500–$2,000 for disposal.
- Soil and footing conditions. Reactive clay or rock can require deeper or engineered footings.
DIY vs Hiring a Tradie
A competent DIYer can save 40–50% by building a simple ground-level deck themselves — materials only for that 20 sqm pine deck might run $2,500–$4,000. But be realistic about the trade-offs. Decking looks simple and punishes mistakes: poor drainage design rots bearers, inadequate footings shift, and non-compliant balustrades or stairs create legal and safety liabilities.
Consider DIY only for low, simple decks if you have solid carpentry skills and the right tools. Hire a licensed builder or carpenter for elevated decks, anything requiring balustrades, structural work, or where council approval is involved. Always get at least three written quotes, check licences and insurance, and ask to see previous work.
Council Approval: Do You Need It?
Rules vary by council and state, but as a general guide: small, low decks (often under a certain height above ground and under a size threshold) may be exempt development, while larger, elevated or roofed structures typically need approval. Setback rules from boundaries also apply. The safe move is to check with your local council before committing — building without required approval can mean costly demolition orders. If your property is in a bushfire-prone area, additional construction standards apply to decks.
Ongoing Maintenance Costs
Do not forget the long game. Budget roughly:
- Treated pine: clean and re-oil or stain every 1–2 years — $200–$600 in materials each time for an average deck, or $800–$1,500+ professionally.
- Hardwood: oil every 1–3 years to maintain colour ($300–$800 DIY), or let it silver for free — purely cosmetic either way.
- Composite: occasional wash with soapy water — negligible cost, which is the whole point.
Over 15 years, a "cheap" pine deck's maintenance can narrow the gap with composite significantly. Run the lifetime numbers, not just the upfront quote.
Saving Money Without Cutting Corners
- Keep the design simple. Rectangles are cheaper than curves, angles and multiple levels.
- Build at ground level where possible. Every 100 mm of height adds stumps, bracing and cost.
- Choose standard board lengths to minimise waste and cutting.
- Time it right. Tradies are often quieter in winter — you may negotiate better rates outside the spring rush.
- Do the prep yourself. Clearing the site and handling demolition yourself can shave hundreds off the quote.
- Phase the project. Build the deck now, add the roof, lighting and screens later as budget allows.
Getting Quotes: What to Ask
When comparing quotes, make sure each one covers the same scope so you are comparing fairly. Ask every builder whether the price includes footings and concrete, demolition and rubbish removal, stairs and balustrades, and oiling or sealing of the finished deck. Check that they hold the appropriate licence for your state and carry public liability insurance. Be wary of any quote dramatically cheaper than the others — it usually means something important has been left out, or corners will be cut where you cannot see them, like footing depth or bearer spacing. A detailed written quote with a clear payment schedule is the mark of a professional.
The cheapest deck is rarely the cheapest over its lifetime. Price the materials, the maintenance and the years — then choose with open eyes.
Frequently Asked Questions
How much does a 20 sqm deck cost in Australia in 2026?
As a rough estimate: $5,000–$8,000 for treated pine, $8,000–$13,000 for hardwood, and $9,000–$14,000 for composite, professionally installed. Ground-level simple designs sit at the lower end; elevated decks with stairs and balustrades at the upper end.
Is composite decking worth it in Australia?
For many homeowners, yes — the near-zero maintenance and long warranties offset the higher upfront cost, especially in harsh UV and coastal conditions. Buy quality products from established suppliers and check fade warranties carefully.
Do I need council approval for a deck?
It depends on size, height and your local council's rules. Small low decks are often exempt; larger, elevated or roofed decks usually need approval. Always check with your council before building.
Can I build a deck myself to save money?
Yes for simple ground-level decks if you have good carpentry skills — you can save 40–50%. Hire a licensed professional for elevated decks, structural work, stairs and balustrades, and anything needing council approval.
What is the cheapest decking material?
Treated pine is the cheapest upfront, but factor in maintenance every 1–2 years. Over a 15-year life, the total cost gap between pine and low-maintenance options narrows considerably.
