If you’re planning a deck for your Sydney home, the first question on your mind is probably: what will it actually cost? A quick online search throws up wildly different numbers, and most are either outdated or too general to be useful for NSW homeowners.
At 5 Star Decking, we’ve built hundreds of decks across Sydney — from compact courtyard platforms in the Inner West to large elevated entertaining areas on the North Shore. Here’s an honest, up-to-date breakdown of what you can expect to pay for a deck in Sydney in 2026.
What Affects the Cost of a Deck?
No two decks are priced identically because no two backyards are the same. The main cost drivers are:
Size — This is the biggest variable. Decking is usually quoted per square metre, so a 30 m² deck costs roughly twice as much in materials and labour as a 15 m² deck of the same spec.
Timber choice — The boards you select have a significant impact. Merbau (also called kwila) is the most popular budget-friendly option, while premium hardwoods like tallowwood and ironbark cost more upfront but last decades longer with less maintenance.
Height and structure — A low-level deck sitting close to the ground uses simpler framing and footings. An elevated or second-storey deck requires engineered bearers, additional posts, and sometimes council certification, all of which add to the total.
Site conditions — Sloping blocks, rocky ground, limited side access, and existing structures all add labour hours. If access is tight, read our guide on building a deck when backyard access is difficult — there are smart workarounds, but they can influence cost.
Extras and finishes — Railings, deck lighting, privacy screening, stairs, skirting, and integrated seating all add to the final figure. Even deck board gaps and fixing systems (hidden clips vs face-screwed) affect the materials line item.
Typical Deck Cost Ranges in Sydney
Based on our 2026 projects, here’s what Sydney homeowners are typically paying:
| Deck Type | Approx. Cost per m² (incl. install) |
|---|---|
| Low-level Merbau deck (ground-level) | $350 to $500 |
| Elevated Merbau deck (1m+ off ground) | $450 to $650 |
| Premium hardwood deck (Tallowwood, Ironbark) | $500 to $800 |
| Second-storey or engineered deck | $650 to $1,000+ |
| Composite decking (premium range) | $550 to $850 |
So a standard 20 m² ground-level Merbau deck might land between $7,000 and $10,000, while a 30 m² elevated hardwood deck with glass railings could come in at $25,000 or more.
These are full installed prices — materials, labour, framing, hardware, and a finished, oiled surface. They assume straightforward site access and standard construction.
Hidden Costs Homeowners Often Overlook
A few extras that don’t always make it into the initial quote from less experienced builders:
Council approval and certification — In NSW, decks under 25 m², less than 1m above ground, and behind the building line are usually exempt. Anything larger, higher, or forward of the building line may need a Complying Development Certificate or DA. Factor $800 to $3,000 for private certification if required. See our guide on planning a low-level deck for approval tips.
Site preparation — Removing an old deck, clearing vegetation, or levelling a sloped yard adds labour and possibly skip-bin hire.
Soil testing and footings — On reactive clay (common in parts of western Sydney) or rocky sites (common on the North Shore), footing costs can be higher.
Ongoing maintenance — Timber decks need oiling every 12 to 18 months. Budget roughly $15 to $25 per m² per treatment if you do it yourself, or more if you hire a professional.
How to Get an Accurate Deck Quote
Online deck cost calculators give a rough ballpark, but they can’t account for your specific block, soil, access, timber availability, or design preferences. The only reliable way to price a deck is a site visit from a licensed builder who can assess the actual conditions and give you a fixed quote.
When comparing quotes, make sure they’re apples to apples — check whether each quote includes framing timber, fixings, site prep, council fees, oiling, and the same timber grade. A suspiciously low quote often cuts corners on substructure quality or omits necessary certifications.
Wondering about the timeline? Our guide on how long it takes to build a deck in Sydney walks you through what to expect from design to handover.
Why Choose 5 Star Decking?
We’re a licensed NSW contractor (Licence No. 395250C) specialising in timber decking across Sydney. We use premium structural timber, proper footing systems, and time-tested construction methods that stand up to Sydney’s coastal humidity, summer storms, and bushfire-prone conditions.
Every deck we build is:
- Custom-designed for your space and lifestyle
- Built to Australian Standards with engineered substructure where required
- Finished and oiled ready to use
- Backed by a licensed contractor with a track record across Sydney suburbs
Ready for an Accurate Price?
Don’t rely on estimates — get a tailored quote for your specific project. Call us on 0433 334 415 or get in touch and we’ll arrange a free site visit to give you a fixed, no-surprises price.
Licence No. 395250C — NSW Contractor Licence
