Deck builders, Sydney
Deck building covers the design and construction of timber or composite decking: new decks, replacing an old deteriorating deck, or extending outdoor living space as part of a wider renovation.
Council approval requirements depend on the deck's height, size and proximity to boundaries, so it's worth confirming this early rather than after materials are ordered.
Typical job value: $10,000 – $30,000
We connect you with licensed local specialists; we don't carry out the work ourselves.
Prefer to talk? Call (02) 5926 2168
What's involved
Design and measure-up
A specialist assesses the site, discusses material and layout, and confirms whether council approval is needed.
Approval, if required
Decks above a certain height or close to a boundary may need a Complying Development Certificate or Development Application before work starts.
Construction
Footings and substructure are installed first, followed by framing and decking boards, then handrails or balustrading if required.
Finishing
Depending on material, this can include oiling, staining or sealing to protect the timber.
What affects the price
- Size of the deck
- Material: treated timber, hardwood or composite
- Height above ground, since elevated decks need more substructure and often handrails
- Whether council approval is needed
- Extras like built-in seating, lighting or a pergola
Licensing and permits
Deck building is licensed building work in NSW; your builder should hold a current NSW Fair Trading licence for carpentry or building work, and for jobs over $5,000, home warranty insurance is generally required. Council rules on deck height, boundary setbacks and whether a certifier needs to inspect footings vary, so check before construction starts.
Common questions
Do I need council approval for a deck?
It depends on height and boundary distance: many low-set decks under a certain height and setback qualify as exempt or complying development, while higher or boundary-adjacent decks usually need formal approval. Your builder can confirm what applies to your block.
Timber or composite decking: which is better?
Timber, such as treated pine or hardwood, has a classic look and can be more affordable up front but needs periodic oiling or staining. Composite costs more initially but needs little maintenance and won't splinter, warp or fade the same way.
How long does building a deck take?
A standard-size deck is often built in a week or two once approvals, if needed, are in place, weather permitting.
Do I need footings inspected?
For decks requiring council approval, a certifier typically needs to inspect footings before decking boards go down; your builder arranges this as part of the job.
Can you build a deck around existing trees or slopes?
Yes, sloped sites and existing landscaping are common and usually just affect the substructure design, such as posts of varying heights, rather than ruling out a deck altogether.
What maintenance does a new deck need?
Timber decks generally need re-oiling or staining every 1–2 years depending on sun exposure; composite decking mainly needs regular cleaning. Your builder can advise on the specific product used.
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