How Much Does Decking Cost In Australia?

Through Trade Heroes, we connect homeowners across Lake Macquarie, Latrobe Valley, Geraldton, Noosa, and every Australian capital with vetted decking experts who price transparently and build to last. The question that starts nearly every decking enquiry on our platform: how much does decking cost? For a standard 20 to 30 square metre deck using treated pine, expect to pay between $4,500 and $9,000 fully installed. Choose hardwood timber or composite decking and that figure climbs to $8,000 to $18,000 depending on deck size, design complexity, and site conditions. We compiled this guide from 14 months of real project data across our directory so you can set a realistic budget and compare quotes from decking experts who actually know what they are doing.

Average Decking Costs By Material

The material cost is the starting point for every decking project. Below are the decking costs our builder partners quote most often through Trade Heroes. All figures are per square metre and include supply of decking boards, joists, bearers, and basic fixings. Labour is quoted separately below.

• Basic treated pine decking: $120 to $200 per square metre installed. Treated pine is the cheapest decking material and the entry point for many homeowners building their first deck. It needs staining or oiling every 12 to 18 months to prevent greying and splintering, so annual maintenance costs add up over time. Expect a lifespan of 10 to 15 years if properly maintained.

• Hardwood timber decking (merbau, spotted gum, blackbutt): $250 to $450 per square metre installed. Australian hardwood timber decking is denser, more durable, and naturally resistant to termites and rot. Spotted gum in particular has become a favourite among architects and builders in coastal New South Wales for its grain character and long term durability. Hardwood is more labour intensive to install because the wood is harder to cut and pre-drilling is required for every screw.

• Composite decking: $280 to $500 per square metre installed. Made from a blend of timber fibre and recycled plastic, composite decking boards resist fading, warping, and insect damage without the need for staining or sealing. The composite decking cost is higher upfront, but maintenance costs over a 25-year lifespan are close to zero, making it a genuinely low maintenance option. Brands like Trex, ModWood, and NewTechWood dominate the Australian market.

For a typical 25 square metre deck area, these prices translate to $3,000 to $5,000 for basic treated pine decking materials alone, $6,250 to $11,250 for hardwood, or $7,000 to $12,500 for composite. Installation costs sit on top of these figures.

What Factors Affect The Overall Decking Cost?

Several factors determine where your quote lands. Some you control at the design stage. Others depend on your property and what the builder finds once work begins.

Deck Size And Design Complexity

Deck size is the primary cost driver. A simple rectangular platform attached to the back of the house is the fastest and cheapest shape to build. Decks larger than 40 square metres start attracting volume discounts on materials but also require more substructure engineering. Design complexity adds cost quickly. Curved edges, built-in seating, integrated planter boxes, and multiple levels all increase both the material and labour components. Multi level decks with stairs connecting different zones are among the most labour intensive builds we see on our platform. A two-tier deck with stairs in Lake Macquarie recently came in at $38,000 for 55 square metres in spotted gum, compared to $22,000 for a single-level build of the same area and timber species quoted by another contractor.

Site Conditions And Preparation

The ground beneath your new deck matters more than many homeowners expect. A flat, clear site with stable soil needs minimal preparation. Sloped blocks, rocky ground, or soft clay require additional excavation, retaining, or deeper footings to create a solid foundation. If the deck sits over a pool pump, hot water system, or stormwater pit, the builder needs to design access panels and work around existing services. Decking construction on elevated sites often requires steel posts and engineered connections rather than standard timber bearers, and that shift in structural approach can add 15% to 25% to the overall cost. One of our builders in Geraldton quoted a homeowner $4,200 in site preparation alone on a sloped coastal block where the rear of the property dropped 1.8 metres from the house to the fence line.

Labour Costs And Location

Labour costs typically account for 40% to 55% of the total cost on a decking installation. Rates vary based on your location and the complexity of the job. A deck builder in inner Melbourne or Sydney charges $60 to $95 per hour, while builders in regional areas like Latrobe Valley or Geraldton charge $45 to $70. Hardwood timber is more labour intensive to work with than treated pine or composite, which is partly why hardwood timber decking carries a higher installed price. For many homeowners, the labour component is where quotes diverge most, so requesting an itemised breakdown from each builder is essential for a fair comparison.

Council Approval And Permits

Not every deck needs council approval, but getting this wrong can be expensive. In most states, decks under 10 square metres and less than 600mm above ground level are exempt from building permits. Beyond those thresholds, you will need a building permit and potentially a building certifier to sign off on structural plans before decking construction begins. Some councils limit deck heights to 1 metre in certain zones, while other councils allow up to 1.5 metres before additional engineering is required. Your local council will confirm the specific rules for your property. In bushfire-prone areas across Victoria, South Australia, and parts of New South Wales, the deck material itself may need to meet BAL ratings, which can rule out basic treated pine decking and push the material choice toward hardwood or non-combustible composite options.

Additional Features That Affect Pricing

Beyond the core deck structure, several accessories and features can shift the overall budget considerably.

• Stairs: $150 to $400 per step depending on material and width. Multi level decks typically need at least one set of stairs connecting to the garden or pool area.

• Balustrades and handrails: $120 to $350 per lineal metre. Required on any deck more than 1 metre above ground, and compulsory around pool areas under AS1926 fencing regulations.

• Built-in seating or storage: $500 to $2,500 depending on length and complexity. Popular on entertaining decks where furniture would clutter the space.

• Lighting: $300 to $1,500 for recessed LED step lights or post-mounted fixtures. Adds ambience and safety to evening use.

• Pergola or shade structure: $3,000 to $12,000 depending on size and materials. Many homeowners in Noosa and northern Queensland bundle a shade structure with the decking installation to maximise usability during summer.

Each of these features should appear as a separate line item in your quote. If a builder rolls everything into a single lump sum, ask for a breakdown so you can see exactly where the money goes.

Comparing Popular Decking Materials

Choosing between popular decking materials comes down to how much you want to pay upfront versus how much you want to spend on maintenance over the deck's lifetime. Treated pine decking is the cheapest to install but demands regular oiling, and the wood degrades faster in exposed conditions. After 10 years, many homeowners end up replacing it entirely. Hardwood timber decking costs more but lasts 25 to 40 years when properly maintained with an annual oil application. The timber develops a silver-grey patina if left unsealed, which some owners prefer and others find frustrating.

Composite decking sits at the premium end on price but eliminates virtually all annual maintenance. No staining, no sanding, no sealing. You hose it down once a season and walk away. The trade-off is that composite can feel warmer underfoot in direct sun than timber, which matters in northern Australia where surface temperatures on dark-coloured composite boards can exceed 60 degrees Celsius on a February afternoon. If you are building a pool deck in Noosa or Townsville, lighter-coloured composite or hardwood is the safer material choice. For a side-by-side cost comparison using a decking calculator, most supply yards and manufacturers offer online tools where you enter your deck area and get an instant estimate for each material type.

Can You Save Money On Decking?

Yes, and the savings do not have to mean cutting corners. Here is what we recommend from the patterns we see across our directory.

• Choose treated pine for the substructure and hardwood or composite for the decking boards only. The substructure is hidden, so spending on premium wood underneath the surface adds cost without visual benefit.

• Keep the design simple. A single-level rectangular deck with no curves or built-in features is the most affordable to build and the fastest to install.

• Get multiple quotes through Trade Heroes and compare scope line by line. The cheapest quote is not always the best value if it omits items like flashings, sealant, or proper footings.

• Time your project for autumn or early winter when builders have more availability and offer cheaper rates on labour.

• Supply your own decking materials if you can source them at trade price, but confirm with your builder first. Some builders will not warranty work on owner-supplied timber.

Frequently Asked Questions

Below are the questions homeowners ask us most often when planning a decking project through Trade Heroes.

How Much Does A Deck Cost Per Square Metre?

Much does decking cost per square metre depends on your material choice. Expect to pay $120 to $200 per square metre for treated pine, $250 to $450 for hardwood, and $280 to $500 for composite decking. These figures include materials, labour, and standard site preparation. The overall decking cost rises with design complexity, stairs, balustrades, and difficult site conditions.

Do I Need Council Approval To Build A Deck?

In most states, decks under 10 square metres and less than 600mm above ground do not require a permit. Larger or elevated decks need a building permit and may require a building certifier. Councils limit deck heights differently depending on your zone, so check with your local council before committing to plans. Your builder should be familiar with the specific requirements in your area.

How Long Does A Timber Deck Last?

A treated pine deck lasts 10 to 15 years with regular maintenance. Hardwood timber decking lasts 25 to 40 years when properly maintained with annual oiling. Composite decking carries manufacturer warranties of 20 to 25 years and typically lasts longer with zero maintenance beyond occasional cleaning. The long term durability of any deck depends on the quality of the substructure, the fixings, and whether the wood or composite is appropriate for your climate.

Get Accurate Decking Quotes Through Trade Heroes

We are a directory of vetted, insured deck builders across every Australian state and regional area. Whether you need a simple treated pine platform in Latrobe Valley, a multi level spotted gum entertainer in Lake Macquarie, or a composite pool deck in Geraldton, Trade Heroes connects you with decking experts who understand your local council requirements and deliver results you can stand on for decades.

Request your free quotes today and get accurate pricing for your next concrete project or decking installation from builders who know the difference between a deck that lasts and one that does not. It takes less than two minutes to submit your project details and start receiving obligation-free quotes. You can find local decking specialists through Trade Heroes in Perth, Sydney, Adelaide, Melbourne, Hobart or Brisbane.