A new deck is one of the most popular ways to add liveable outdoor space to an Australian home, and for good reason. It can turn an awkward backyard into an entertaining area, boost your home's appeal, and give you a spot to enjoy the sun without the cost of a full home extension. But the big question most homeowners ask first is simple: how much does it actually cost?
The honest answer is that deck costs in Australia vary enormously depending on size, height off the ground, decking material, and whether you're building on flat, easy-access ground or a tricky sloping block. This guide walks through realistic 2026 cost ranges to help you budget, but treat every figure here as a starting point for your own research rather than a fixed quote. Always get at least two or three written quotes from local, licensed tradies before committing to a project.
Most builders and decking companies price jobs by the square metre, which makes it a handy starting point for a rough budget. As a general guide, homeowners might expect somewhere in the vicinity of the following ranges, though your actual quote could sit outside these depending on your site and finish level.
These figures are indicative only and generally assumed to include labour and materials, but they can shift with site access, soil conditions, council requirements, and the tradie's location. Prices tend to run higher in and around major capital cities and in more remote regional areas where materials need to travel further.
The decking boards themselves are one of the biggest cost variables, and each material comes with its own trade-offs around price, appearance, and upkeep. Here's a general comparison to help you weigh up the options — treat these as broad indicative ranges rather than exact figures.
| Material | Approx. cost per sqm (supply only) | Pros | Cons |
| Treated pine | $40–$90 | Most affordable, widely available, easy to work with | Shorter lifespan, needs regular oiling/sealing, can warp over time |
| Merbau / hardwood | $70–$150 | Classic look, durable, popular Aussie choice | Can leach tannins early on, needs periodic oiling, price can fluctuate |
| Composite decking | $90–$180 | Low maintenance, resists rot and splintering, consistent colour | Higher upfront cost, can get hot underfoot in full sun |
| Modwood / wood-composite boards | $80–$160 | Made partly from recycled materials, low splinter risk, minimal upkeep | Similar heat retention to composite, limited colour range compared to timber |
These are supply costs for the boards only — labour, substructure (bearers and joists), and finishing generally add substantially on top, which is why the per-square-metre totals in the section above are usually much higher than board cost alone.
Putting a size against a dollar figure can make budgeting feel more real. These are rough, all-up examples based on the per-sqm ranges above — actual costs will vary depending on material choice, height, and site conditions.
Larger decks don't always cost proportionally more per square metre — sometimes the opposite, since fixed costs like site setup and access can be spread across more area. On the other hand, complex shapes, multiple levels, or built-in features like seating and planter boxes can push costs up regardless of overall size.
How high your deck sits above the ground has a major impact on price, mainly because of the substructure and safety requirements involved.
If your block slopes significantly, it's worth asking your builder or tradie early on whether a split-level design might actually work out more cost-effective than one large elevated platform.
Adding a roof or covered pergola-style structure over your deck turns it into a true year-round alfresco space, but it's also one of the bigger cost additions. A roofed or covered deck might add somewhere in the order of $150–$400+ per square metre on top of the base deck cost, depending on the roofing material (colorbond, polycarbonate, or a more elaborate insulated roof panel) and whether the structure needs to tie into your existing roofline.
Fully enclosing a deck with screens, louvres, or glass to create a semi-outdoor room pushes costs even higher again, and can start to approach the cost of a small home extension. If budget is tight, a simple shade sail or freestanding umbrella can offer some sun protection at a fraction of the cost while you save for a permanent roof later.
Whether you need council or building approval generally depends on your deck's height, size, and proximity to boundaries — rules vary by state, territory, and individual council, so it's worth checking with your local council or a licensed building certifier before you start.
Skipping required approvals can create real headaches down the track, including problems when selling the home, so it's generally worth factoring permit costs and timeframes into your overall budget from the start.
Building your own deck can save a meaningful chunk of money, since labour often makes up a large share of the total cost. A confident DIYer tackling a simple, low ground-level deck might save somewhere in the order of 30–50% compared with hiring a tradie, mainly on labour.
That said, DIY decking isn't for everyone. Getting footings, bearers, and joists right matters for safety and longevity, and anything elevated, close to boundaries, or requiring council sign-off often needs licensed trade involvement anyway. Many homeowners land on a middle ground — doing the demolition, site prep, or finishing (like oiling) themselves while leaving the structural carpentry to a qualified tradie.
If you do hire a professional, get multiple quotes, check licensing and insurance, and ask to see examples of previous decking work before signing off.
The cost of a deck doesn't stop once it's built — different materials come with different ongoing upkeep costs that are worth factoring into your decision.
Factoring a few hundred dollars a year into your household budget for deck upkeep is a reasonable habit, regardless of the material you choose.
If your dream deck is stretching the budget, there are several common ways Australian homeowners try to bring costs down without compromising too much on quality.
Whatever route you take, building in a contingency of around 10–15% on top of your budgeted cost is a sensible habit, since unexpected site issues (like rock or poor soil at footing depth) can add cost once work is underway.
Estimate your own deck with our renovation cost calculator before you commit to a design.
A deck or alfresco addition often needs a licensed carpenter or builder — browse local outdoor and decking tradies in our directory and read our guide to hiring a builder. If your deck is elevated or attached to the house, our guide to council approval explains when you will need a permit.
A small deck of around 12–15 square metres might cost somewhere in the range of $4,000 to $10,000 all up, depending on the decking material, height, and site access. Getting a few local quotes is the best way to pin down a realistic figure for your specific situation.
It depends on your priorities. Composite decking generally costs more upfront than treated pine, but it typically needs far less ongoing maintenance since it doesn't require regular oiling. Many homeowners find the lower long-term upkeep worth the higher initial spend, but timber still appeals for its natural look and often lower purchase price.
It depends on your deck's height, size, and location relative to your boundaries, and rules differ between states, territories, and individual councils. Many low, ground-level decks may not need formal approval in some areas, but elevated or larger decks generally do. It's best to check with your local council or a building certifier before starting work.
Yes, DIY decking is common for simple, low ground-level builds and can meaningfully cut labour costs. However, anything elevated, structurally complex, or requiring council approval often benefits from professional involvement to make sure footings, framing, and safety requirements are properly met.
Adding a roof or covered structure typically adds a further cost on top of the base deck price, often in the vicinity of $150–$400+ per square metre depending on the roofing material and design complexity. A simple shade sail can be a cheaper interim option if a full roof isn't in the budget yet.
Most timber decks, including merbau and treated pine, generally benefit from re-oiling or resealing roughly every one to two years to protect the timber and keep it looking its best. Costs for this vary depending on deck size and whether you DIY it or hire a professional.
