When it comes to building a new deck in Sydney, one of the biggest decisions you’ll face is the material: timber or composite? Both have loyal followings, and both have genuine advantages — but they’re not interchangeable. This guide breaks down the real differences so you can make the right choice for your budget, lifestyle, and long-term plans.
What’s the Difference?
Timber decking (like merbau, spotted gum, or blackbutt) is cut directly from hardwood logs. It’s 100% natural, looks warm and authentic, and has been the gold standard in Australia for decades.
Composite decking (like Modwood, Millboard, or Trex) is engineered from a mix of wood fibres and plastic polymers. It mimics timber’s appearance while offering lower maintenance and longer guaranteed life.
Neither is “better” — they’re just different. Let’s compare.
1. Cost: Initial Installation vs Long-Term Value
Timber
- Material cost: $60–$150 per linear metre (basic grades) to $150–$250/LM (premium hardwoods like merbau)
- Installation: $200–$400/m² (labour)
- Total for 50m² deck: $10,000–$20,000+
Composite
- Material cost: $120–$300 per linear metre
- Installation: $250–$500/m² (labour — slightly more complex)
- Total for 50m² deck: $15,000–$28,000+
Verdict: Timber is cheaper upfront. But don’t stop there.
Hidden costs over 10 years
Timber:
- Annual sanding/sealing: $800–$1,500
- Occasional board replacement: $300–$800/year
- Deeper maintenance: $10,000–$15,000 over the life of the deck
Composite:
- Minimal annual upkeep: $200–$500 (occasional cleaning, maybe a once-yearly seal refresh)
- Board replacement very rare (10–15 year warranty typical)
- Maintenance: $2,000–$3,000 over the life of the deck
Real cost over 15 years: Timber and composite often end up roughly equal — but timber requires hands-on work; composite just needs a hose-down.
2. Appearance & Aesthetics
Timber
- Pros: Warm, natural grain, authentic feel, ages beautifully (if maintained), works with any design style
- Cons: Colour fades over time without sealing, can look weathered or grey if neglected
Composite
- Pros: Consistent colour, doesn’t fade (holds colour for 15+ years), modern finish, zero grain variation
- Cons: Can look “plastic-y” to some, less warm than timber, uniform appearance might feel less organic
Verdict: If you want that classic timber warmth and don’t mind regular maintenance, timber wins. If you prefer a modern, low-maintenance look, composite is hard to beat.
3. Maintenance: Time, Money & Effort
This is where the two diverge most dramatically.
Timber decking requires:
- Annual sealing/oiling (typically every 12 months in Sydney’s UV and salt-air climate)
- Pressure washing every 2–3 years
- Sanding every 5–7 years (if stained)
- Spot repairs for rot, termite damage, or raised boards
- Constant vigilance: check for splits, loose boards, soft spots
Time commitment: 10–20 hours per year, plus $1,000–$1,500 annually.
Composite decking requires:
- Occasional rinsing with a hose (monthly is fine)
- Mild soap and water for stubborn stains
- That’s it.
Time commitment: 2–3 hours per year, ~$200 annually.
Verdict: Composite is a no-brainer if you value your weekends. Timber demands respect and attention.
4. Durability & Lifespan
Timber
- Lifespan: 15–25 years (hardwoods like merbau; softwoods like pine are 5–10 years)
- Risks: Rot, termites, cupping, splintering, UV damage
- Sydney factor: Salt air and intense UV shorten lifespan unless rigorously maintained
Composite
- Lifespan: 20–30 years (warranties often 10–15 years)
- Risks: Fading (minimal), staining (surface-level, easily cleaned), some softer composites can dent
- Sydney factor: Salt air doesn’t affect composite; UV resistance is built-in
Verdict: On paper, composite lasts longer. In reality, a well-maintained timber deck can outlast a neglected composite one. But composite is more forgiving.
5. Environmental Impact
Timber
- Pros: Renewable (if sourced sustainably), biodegradable, carbon-neutral over its lifetime
- Cons: Logging has environmental cost; not all timber is sustainably sourced
Composite
- Pros: Can use recycled plastic and wood waste, reduces new timber demand
- Cons: Plastic component means it won’t biodegrade; not recyclable at end of life
Verdict: Both have trade-offs. If sustainability matters, ask your builder about FSC-certified timber or recycled-content composites.
6. Resale Value & Perception
Sydney buyers tend to prefer authentic timber decks — they see it as premium and natural. A well-maintained merbau deck is a genuine selling point.
Composite is gaining acceptance but isn’t seen as premium yet. Some buyers view it as “fake wood,” though that’s changing.
Verdict: Timber has a slight edge for resale appeal in Sydney’s market.
So Which Should You Choose?
Choose timber if:
- You love the natural look and don’t mind regular maintenance
- You’re building a high-end home where authenticity matters
- You enjoy weekend DIY projects
- You plan to stay in the home long-term (10+ years)
- Your budget is tighter upfront
Choose composite if:
- You want a low-maintenance deck you can enjoy (not maintain)
- You prefer a modern, consistent aesthetic
- You live in a harsh climate (coastal areas, high UV zones)
- You prefer not to think about your deck after it’s built
- You’re willing to pay more upfront for peace of mind
2026 Sydney Pricing: What to Budget
50m² timber deck (merbau, medium grade): $12,000–$18,000 supply & install
50m² composite deck (Modwood/Millboard): $18,000–$26,000 supply & install
Both include posts, joists, fixings, and base prep. Annual maintenance costs above.
Ready to Build?
Whether you go timber or composite, the quality of the install is what matters most. A poorly installed composite deck won’t save you. A perfectly sealed timber deck will outlast and outperform a rushed composite job.
At 5 Star Decking, we’ve built hundreds of decks across Sydney using both materials. We’ll match you with the right choice for your home, lifestyle, and budget.
Ready to start? Contact us today or call 0433 334 415 for a free consultation. We’ll walk you through the options and get you a detailed quote within 48 hours.
5 Star Decking AU — Licensed Builder (NSW #395250C) | Serving Sydney with premium decking since 2015.
