Timber vs Composite Decking in Sydney: Cost, Maintenance and Which One Suits Your Backyard

Every Sydney homeowner planning a deck runs into the same fork in the road: timber’s natural warmth and character, or composite’s low upkeep and long life. Both build a beautiful outdoor space, but they behave very differently in Sydney’s mix of harsh sun, humidity and the occasional heavy downpour, and they sit at different price points. This guide gives you a clear, honest comparison of cost and maintenance for Sydney conditions, so you can pick with confidence. A Bargain Gardener builds both, and the right choice is often part of a wider plan for landscaping your backyard rather than the deck alone.

Timber vs Composite Decking at a Glance

Before the detail, here is how the two stack up across the things that matter most for a Sydney deck. Treat the cost figures as typical Sydney ranges for 2026, supplied and installed, rather than a fixed quote, since every backyard and site is different.

What Timber Decking Costs and Involves in Sydney

Popular timber options (merbau, spotted gum, treated pine)

Timber gives you that unmistakable natural look, and the species you choose sets both the price and how it handles Sydney weather. Treated pine is the budget entry point, typically around $200 to $300 per square metre supplied and laid, and it does the job on a tight budget, though it is softer and needs diligent upkeep. Merbau is the most popular hardwood in Sydney, usually around $300 to $450 per square metre, prized for its rich reddish tone, natural durability and how well it takes oil. Spotted gum sits at the premium end, roughly $350 to $550 per square metre, and it is one of the hardest, most striking timbers going, which is why it is a favourite on the North Shore. All are figures to plan with, not fixed quotes, since access, deck height, stairs and balustrades all move the number.

Ongoing maintenance (oiling, sanding, sealing)

The trade-off with timber is upkeep, and in Sydney’s climate it is real work. UV, humidity and rain all take their toll, so a timber deck generally needs a clean and re-oil about once a year to hold its colour and protect the surface, often costing somewhere around $200 to $600 for the materials and a day’s work depending on the size. Skip it for too long and hardwood weathers to a silver-grey, and the surface can start to check and crack. Every few years, a light sand back before re-oiling brings it up beautifully. If you love the look and do not mind the annual ritual, timber rewards you. If that sounds like a chore, it is worth reading on.

What Composite Decking Costs and Involves in Sydney

Composite decking is made from a blend of recycled wood fibres and plastic, and it is built to remove the maintenance headache entirely. Upfront, it costs more, typically around $350 to $600 per square metre supplied and laid in Sydney, and premium boards sit higher again. Why the premium? You are paying for boards that will not rot, splinter or need oiling, and for a look that stays consistent for decades. Maintenance is close to zero: an occasional wash to keep it clean is about all it asks, with no sanding, oiling or sealing. That matters more in Sydney than many people realise, because our humidity and UV are exactly what wear timber down, and composite simply shrugs them off. Modern boards resist fading well, though colour can settle slightly in the first year. The one thing to plan for is heat, since composite can get noticeably hotter than timber in full Sydney summer sun, so lighter colours and some shade help on a north-facing yard. It is also worth choosing a quality capped board rather than the cheapest option, as budget composite can look artificial and fade unevenly. Over ten or fifteen years, the low upkeep is where composite earns its keep, and for busy households that would rather use the deck than maintain it, that is the whole point.

Which Decking Is Best for Sydney’s Climate?

The best material really depends on your yard and how you live. For a shaded courtyard, either works well, and timber’s cooler surface and warmth are lovely where heat is not an issue. For a full-sun, north-facing yard, timber stays cooler underfoot, while composite is fine if you choose a lighter colour and accept it warms up. Around a pool, both are used widely; slip resistance and a splinter-free surface matter, and composite’s low upkeep suits a wet zone that gets constant use. On a budget-driven project, treated pine or merbau timber gets you a great deck for less upfront, provided you are willing to keep up the oiling. For a long-term family home where you would rather not spend weekends maintaining a deck, composite’s set-and-forget nature usually wins over the life of the deck. If you plan to sell in a few years, a well-built deck of either material adds appeal, so the choice comes back to budget and upkeep rather than resale. If you are weighing timber against a hard surface instead, it is worth comparing your outdoor paving options too. Whichever way you lean, our licensed deck builders in Sydney can look at your site and recommend the right pick for how you will actually use the space.

Frequently Asked Questions

Is composite decking worth the extra cost in Sydney?

For many Sydney homeowners, yes. Composite costs more upfront but needs almost no maintenance, so over ten to fifteen years you save the time and money that timber’s annual oiling demands. If you value low upkeep and a consistent look, the higher initial price often pays off. If budget and natural character matter most, timber may suit you better.

How long does a timber deck last in Sydney’s weather?

With regular maintenance, a treated pine deck typically lasts around 15 to 20 years, while quality hardwoods like merbau and spotted gum can last 25 to 40 years or more. Sydney’s sun and humidity make annual oiling important, since a well-maintained hardwood deck lasts far longer than one that is neglected.

Does composite decking get too hot in the Sydney sun?

Composite can get hotter than timber in direct summer sun, especially darker boards. It is rarely a problem in shaded or part-shaded areas, and choosing a lighter colour helps a lot on a full-sun, north-facing yard. Some afternoon shade or a covered section keeps a composite deck comfortable underfoot through summer.

Do I need council approval to build a deck in Sydney?

It depends on the deck’s height and size. Some smaller, low decks can be built as exempt development, while larger or elevated decks often need approval. Rules vary between councils, so always check with your local council before you start, or ask your builder to confirm what applies to your specific project.

Choosing the right deck for your backyard

The timber-versus-composite decision comes down to a simple trade-off: timber for natural character and a lower upfront cost, composite for low maintenance and long-term value in Sydney’s climate. There is no wrong answer, only the one that fits your yard, budget and lifestyle. If you would like an honest recommendation and a firm price for your site, our licensed deck builders in Sydney are here to help. Get a free decking quote from A Bargain Gardener’s experienced Sydney team, and we will help you build a deck you will love for years.