Decking Cost Breakdown: Sydney 2026 Budget Guide & Price Factors
Introduction
If you’re thinking about building or replacing a deck in Sydney, one question dominates the conversation: How much will it cost?
Deck pricing in Sydney varies wildly — from $8,000 for a small timber platform to $45,000+ for a large composite deck with pergola and built-in seating. Material choice, size, site complexity, and local council requirements all push costs up or down.
At 5 Star Decking, we’ve built hundreds of decks across Sydney’s inner west, eastern suburbs, and Sutherland Shire. This guide breaks down exactly what you’ll pay — and what factors actually drive the budget.
Average Decking Costs in Sydney 2026
Here’s what most Sydney homeowners spend:
Timber Decking:
– Small deck (3m × 4m): $12,000–$18,000
– Medium deck (4m × 5m): $18,000–$28,000
– Large deck (5m × 6m+): $28,000–$40,000
Composite Decking (Modwood, Trex, Millboard):
– Small deck (3m × 4m): $15,000–$22,000
– Medium deck (4m × 5m): $22,000–$35,000
– Large deck (5m × 6m+): $35,000–$50,000+
These are *full installation costs*, including subframe replacement, drainage, council compliance, and finishing. Prices assume standard terrace or suburban block access — tight inner-west courtyards or sloped blocks cost more.
What Actually Drives Deck Costs?
1. Material Choice
Timber is cheaper upfront but requires maintenance. You’ll spend $40–$80 per square metre on labour alone, plus $15–$30/m² on materials (Spotted Gum, Blackbutt, Merbau).
Composite decking costs $60–$100/m² in materials but requires no sanding, oiling, or repainting. Over 20 years, composite often works out cheaper despite the higher initial price.
2. Size & Complexity
Every square metre added increases labour and materials. A 15m² deck is roughly double the cost of a 7.5m² deck — not because we charge twice as much per m², but because larger projects need more planning, more subframe engineering, and more finishing work.
Built-in steps, seating, pergolas, and balustrades all add cost — typically $2,000–$5,000 per feature.
3. Site Access & Soil Conditions
Sydney’s terrace homes in the inner west (Summer Hill, Ashfield, Marrickville) often have tight access. If we can’t drive a truck to the block, labour costs go up 20–30%. Similarly, if your soil is poor or you’re on a sloped block, subframe work gets expensive fast.
4. Council Approvals
Most decks in Sydney need development approval. Sutherland Shire, Waverley, and Woollahra councils have strict height and setback rules. A deck that needs engineering drawings costs $500–$1,500 more just in council fees and design.
5. Removal & Site Prep
Removing an old deck and disposing of timber waste adds $3,000–$6,000 to the project, depending on size and condition.
How to Cut Costs Without Cutting Corners
Stay modular. A 4m × 5m deck is cheaper per square metre than a 3m × 3m deck. Bigger = more efficiency.
Choose the right material for your use. If you’re renting, renovating to sell, or won’t maintain it — composite wins. If you love the look of hardwood and will oil it annually, timber is fine.
Plan for proper drainage. Skimping on subframe ventilation leads to rot, repairs, and replacement in 10 years. It’s worth the extra $2,000 now.
Get multiple quotes. We always recommend comparing three builders. Not just on price — on warranty, materials, and design.
Bundle with other works. If you’re also doing pergola, fencing, or landscaping, negotiate a package price with your builder. Many (including us) discount bundled projects by 5–10%.
What’s Included in Our Prices?
When 5 Star Decking quotes a deck, this is what you get:
- Full subframe replacement or new subframe (posts, joists, noggins)
- All decking boards (timber or composite)
- Balustrade/railing (if needed for council compliance)
- Drainage and ventilation engineering
- Labour: site prep, framing, boarding, finishing, cleanup
- Warranty: 7 years on composite, 5 years on timber (labour only)
- Council
liaison and compliance sign-off
We don’t upsell you on unnecessary features. We build what your space needs.
Why Sydney Deck Prices Keep Rising
Material costs have climbed 15–20% since 2024. Composite boards (Millboard, Modwood) are now 25–30% more expensive than three years ago. Timber — particularly hardwoods like Merbau — has also jumped thanks to supply chain pressure.
Labour costs have risen steadily too. Good tradespeople are in demand, and Sydney’s building boom means decking schedules are tighter than ever.
What You Should Expect From a Good Deck Quote
A real quote should include:
- Detailed breakdown (materials, labour, on-costs)
2. Design sketch or visual reference
3. Timeline (usually 2–4 weeks for a standard deck)
4. Warranty terms (in writing)
5. Payment terms (don’t pay in full upfront) - Council approval
responsibility (should be the builder’s)
Avoid quotes that are vague, verbal-only, or missing detail. A cheap quote from someone who “won’t bother with council” is a false saving — you’ll end up with an illegal deck.
Ready to Get Your Deck Built?
If you’re in Sydney — from the inner west to the eastern suburbs, Sutherland Shire to Manly — we’ve built decks in your area and know your council’s rules inside out.
Get a free, no-obligation quote from 5 Star Decking. We’ll visit your site, assess materials and complexity, and give you a real price — not a guess.
📞 0433 334 415
📧 info@5stardecking.com
We’re licensed builders (NSW Licence: 395250C) with 7-year warranties on all work.
Let’s build your perfect outdoor space.
