Choosing the right decking material for your Sydney backyard is one of the biggest decisions you’ll make for your outdoor space. With Sydney’s harsh UV, salt-laden coastal air, and unpredictable summer storms, the material you pick will determine how much maintenance your deck needs and how long it lasts. In this guide, we compare timber, composite, and concrete — the three most popular options for Sydney homes in 2026.
Timber Decking: The Traditional Choice
Timber remains the go-to for Sydney homeowners who want natural warmth and character. Hardwoods like spotted gum, merbau, and blackbutt are the most common picks, offering rich grain patterns and natural durability.
Pros: Natural beauty, can be sanded and re-oiled, adds value to period homes, lower upfront cost at around $440/m² for hardwood.
Cons: Requires annual oiling, susceptible to rot and termite damage, can splinter over time, fades without maintenance.
For coastal suburbs like Bondi or Coogee, hardwood decking performs well if maintained properly — but skip it if you want a set-and-forget deck.
Composite Decking: The Low-Maintenance Winner
Composite decking has surged in popularity across Sydney, and for good reason. Premium brands like Millboard offer engineered boards that resist fading, staining, and rot without ever needing oiling or painting. At $550/m² for composite or pool decking, it’s a higher upfront investment but pays off in reduced maintenance over 15-25 years.
Pros: Zero oiling or painting, mould and rot resistant, no splinters, consistent colour, excellent for pool surrounds, P5 anti-slip ratings available.
Cons: Higher upfront cost, can’t be sanded back like timber, hollow-core profiles need proper joist spacing (max 300mm centres).
For Sydney pool decks and coastal properties, composite is the clear winner. The salt air doesn’t affect it, and the anti-slip surface is essential around wet areas.
Concrete Decking: The Durable Alternative
Concrete is less common for raised decks but increasingly popular for ground-level patios and alfresco areas. Exposed aggregate and stamped concrete finishes can mimic timber textures while offering unmatched durability.
Pros: Virtually indestructible, zero maintenance beyond cleaning, fire-rated, excellent thermal mass for winter warmth.
Cons: Hard surface underfoot, can crack in expansive soil, limited to ground-level applications, can’t be used for elevated decks.
Concrete works well for flat Sydney blocks where you want seamless indoor-outdoor flow, but it’s not a substitute for a proper raised timber or composite deck.
Head-to-Head: Which Material for Your Sydney Suburb?
Coastal (Bondi, Coogee, Manly): Composite wins. Salt air destroys timber fasteners and accelerates timber degradation. Composite boards are impervious to salt corrosion.
Leafy Inner West (Ashfield, Burwood, Strathfield): Timber shines here. Sheltered backyards with established trees protect timber from harsh UV, and the natural grain complements heritage homes.
Western Sydney (Penrith, Blacktown, Castle Hill): Both work, but composite’s heat resistance gives it an edge in areas where summer temperatures regularly hit 40°C+.
North Shore (Chatswood, Lane Cove, Turramurra): Timber remains the prestige choice, particularly spotted gum and blackbutt for luxury renovations.
The Verdict
There’s no single “best” material — it depends on your budget, location, and how much maintenance you’re willing to do. If you want a deck that looks great for 20+ years with minimal upkeep, composite is the smartest investment for Sydney conditions. If you love the natural look and don’t mind annual maintenance, hardwood timber at $440/m² offers excellent value. And if you’re building a ground-level alfresco area, concrete is worth considering for its near-zero maintenance.
Still not sure which material suits your backyard? Our team at 5 Star Decking has been building decks across Sydney for over 15 years. We’re licensed NSW builders (Licence 395250C) and we work with all three materials. Get in touch for a free site visit and material recommendation tailored to your property.
