Hardwood Decking Cost in Perth: Jarrah, Merbau, Spotted Gum & Blackbutt
Hardwood decking in Perth runs $315–$580/m² installed, but the species you pick swings both the price and the character of the deck. Jarrah is the local hero, merbau the value pick, spotted gum and blackbutt the durable all-rounders. Here's how they compare.
There's a reason hardwood still wins hearts in Perth despite the rise of composite: nothing else gives you that genuine grain, the warmth underfoot, and the way a good timber deck weathers into the house. The trade-off is maintenance — hardwood in the WA sun wants oiling once or twice a year — and the species you choose sets both the look and the budget. Below is a plain-English guide to the four timbers you'll actually be offered in Perth.
Hardwood cost by species
| Species | Character | Perth cost (supply + install, inc GST) |
|---|---|---|
| Merbau | Reddish-brown, stable, the value hardwood | $315–$580/m² |
| Jarrah | Deep red, WA-local, premium | Upper end of the hardwood band |
| Spotted gum | Blonde-to-brown, tough, great grain | Mid-to-upper hardwood band |
| Blackbutt | Pale, uniform, hard-wearing | Mid hardwood band |
The overall hardwood range for Perth is $315–$580/m² supply and install including subframe, GST included, re-verified against 90+ sources. Where a species sits inside that band depends on availability and board grade — jarrah, being the local premium timber, tends to sit near the top.
The species, one by one
Jarrah. The West Australian classic. Grown in the state's south-west, jarrah gives a deep red that ages to a rich, silvered patina and carries genuine local provenance — for a lot of Perth homeowners that alone makes it the pick. It's dense, durable and holds up to the sun, and it sits at the premium end of the hardwood range. If you want a deck that feels distinctly WA, jarrah is it.
Merbau. The value workhorse and the most commonly laid hardwood in Perth. Merbau is stable, reasonably priced, resists weather well and delivers a warm reddish-brown that most people love. It's the default recommendation when someone wants a real hardwood deck without stretching to premium species. One quirk: fresh merbau leaches tannins, so it can stain paving early on until it's sealed and settled.
Spotted gum. A tough Australian hardwood with striking grain and colour variation from blonde to chocolate. It's hard-wearing, takes oil well and gives a more characterful board than merbau. It sits mid-to-upper in the range and is a strong choice if you want visual interest.
Blackbutt. Paler and more uniform than the others, blackbutt is a hard, dependable timber that suits a lighter, more contemporary look. It's a solid mid-range option that runs a little cooler underfoot than the darker species thanks to its lighter tone.
The maintenance you're signing up for
This is the part to be honest with yourself about. A hardwood deck in Perth needs oiling once or twice a year to keep its colour and protect it from the sun — skip it and the timber greys and dries out. Expect $50–$100 in product if you do it yourself, or $26–$63/m² if a professional handles the sand-and-re-oil — call it $200–$500 a year on a typical deck. Done properly, that upkeep buys you real longevity: merbau, jarrah and spotted gum decks last 25–40+ years. It's a genuine ongoing commitment, and it's the main reason some Perth homeowners switch to composite. If you enjoy the ritual and want authentic timber, it's a fair trade.
Choosing your species
Pick jarrah for local provenance and a premium deep-red finish; merbau for the best balance of cost, stability and warmth; spotted gum for standout grain; blackbutt for a lighter, cooler, contemporary look. Whatever you choose, confirm the board grade and the subframe spec in the quote — the frame determines how long the deck lasts far more than the species on top. Get three like-for-like quotes on the same timber and the same substructure so the comparison is real.
Frequently asked questions
How much does a hardwood deck cost in Perth?
$315–$580/m² supply and install including the subframe, GST included. Merbau sits toward the value end, jarrah toward the premium end, with spotted gum and blackbutt in between.
Is jarrah more expensive than merbau?
Generally yes. Jarrah is WA's premium local hardwood and sits near the top of the range, while merbau is the value pick lower in the band. Both are durable, sun-tolerant hardwoods.
How often does a hardwood deck need oiling in Perth?
Once or twice a year to hold colour and resist the sun. Budget $50–$100 in product for DIY, or $26–$63/m² (roughly $200–$500 a year) for a professional sand-and-re-oil.
How long does a hardwood deck last?
Merbau, jarrah and spotted gum decks last 25–40+ years with regular oiling and a sound subframe. Neglect the maintenance and the lifespan drops considerably.
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