Composite Decking Sydney

A well-installed composite deck lasts 25–30 years, and premium capped boards are warranted well beyond that — Trex and TimberTech AZEK ranges carry 25–50 year warranties. The biggest factors are board quality, correct installation (ventilation and subframe spacing matter more than people think) and a rinse-down a couple of times a year. That’s it — no oiling, no sanding, no re-staining.

Most of our professionally built composite decks in Sydney come in between $950 and $1,365 per square metre fully installed, depending on the board, site access, deck height and detailing. Millboard sits at the premium end at around $338–$395 per square metre for the boards alone. For a quick estimate on your numbers, try our deck cost calculator, or book a free consultation and we’ll give you a fixed price for your site — no surprises.

For most Sydney homeowners, yes — if you plan to keep the deck more than about five years. Composite costs more upfront than treated pine or merbau, but a timber deck needs sanding, washing and oiling every year or two for its whole life. Over a 25-year lifespan, composite usually works out cheaper, and it looks the same in year ten as it did in year one. Where it’s not worth it: very short-term ownership, or if you specifically want the patina of real hardwood. We break the decision down fully in our guide to choosing the best composite decking.

It depends what you value. Composite wins on maintenance (a hose-down versus annual oiling), lifespan, colour consistency and warranties. Timber wins on upfront cost and the natural grain and feel of real wood — and species like ironbark and blackbutt are beautiful, bushfire-rated options. We build both, so we’ll give you a straight answer for your site rather than a sales pitch. See our timber decking range to compare.

Not upfront — good composite costs more per square metre than most timber. But remove the lifetime cost of sanding, acid-washing and oiling that comes with wood, add composite’s longer lifespan, and it’s usually the cheaper deck over the long run. If the upfront budget is tight, ask us about the Trex Select range (see the last question below).

It gets warm in direct summer sun — though not as hot as pavers, tiles or concrete. Darker boards absorb more heat than lighter ones. If heat matters for your site (north-facing, no shade, kids in bare feet), choose a lighter colour, consider the Trex Lineage or Select range, or a PVC board like TimberTech AZEK which runs cooler, or plan shade into the design — we build pergolas too.

Modern capped composite boards are engineered to hold their colour. The cap bonded around the board core blocks UV and moisture, and the ranges we install back this with fade-and-stain warranties of 25–50 years. Expect a slight, even weathering in the first few months as the board settles to its final colour — that’s normal and covered in the samples we show you.

Less so than timber. Quality composite boards have a textured, grooved cap designed for wet-weather traction, and unlike timber they don’t grow the mould and algae film that makes old wooden decks dangerous. Around pools we’ll steer you to the boards with the best wet-grip ratings and detail the drainage properly.

There’s no single winner — it depends on budget and look. As a rule of thumb from our installs: Trex is the best all-rounder for value and warranty; Millboard is the most convincing timber look and feel (it’s the one people can’t tell from wood); TimberTech AZEK is the pick for heat, coastal exposure and the longest warranties. We compare them side by side — with pricing — in our guide to choosing the best composite decking.

Five things separate a board you’ll love in year twenty from one you’ll regret in year five. Material composition — look for a fully capped board (the protective shell bonded around the core); capped PVC like TimberTech AZEK offers the best moisture and heat performance, while capped wood-composite like Trex balances cost and durability.

Colour and texture — order physical samples and look at them outside in your actual light; streaked, variegated boards hide wear and leaf stains far better than flat single colours.

Warranty  — the ranges we install carry 25–50 year fade-and-stain warranties, and the length is a good proxy for board quality; be wary of anything under 15 years.

Board stability — check the span rating and expansion behaviour, because a cheap board that sags between joists or gaps in summer will spoil the whole deck.

Price and budget — installed composite in Sydney runs $750–$1,365 per square metre, and the right question isn’t “what’s cheapest?” but “what does the deck cost per year of life?”

For the full breakdown, read our guide to choosing the best composite decking.

Often, yes. Trex is rated to BAL-29 and Millboard to BAL-19, which covers many bushfire-prone blocks around Sydney and the Southern Highlands. For ratings beyond BAL-29, we install Knotwood aluminium decking, which is non-combustible. Tell us your BAL rating and we’ll confirm which boards comply for your site.

The Trex Select range. It brings a fully installed Trex deck in from around $950 per square metre, in three SunComfortable™ colours — Malted Barley, Millstone and Whiskey Barrel. It’s the range we point people to when budget matters but the “no maintenance” promise still has to hold.