What Affects the Cost
Deck size and layout. A simple rectangular platform costs less per square metre than an L-shaped or multi-level design with step-downs. Installed costs range from $250–$700/m2 all-in.
Timber vs composite. Treated pine ($43–$50/m2 boards) is the entry point. Merbau ($73–$80/m2) and spotted gum ($90–$120/m2) are Melbourne's most popular hardwoods. Composite boards from
ModWood ($122–$151/m2) or
Trex ($215–$265/m2) handle Melbourne's wet winters without annual oiling.
Ground slope and soil type. Eastern suburbs blocks (Doncaster, Glen Waverley, Templestowe) often slope away from the house, requiring taller stumps and more bracing. Some areas have reactive clay soils —
AS 2870 classifies these from M (moderate movement) to H2 (60–75mm movement). Screw piles ($150–$300 each) outperform concrete piers on reactive soils because they anchor below the reactive zone.
Heritage overlay. Inner Melbourne suburbs like Fitzroy, Carlton, and South Melbourne have heritage overlays that restrict external structures. A planning permit ($1,300–$1,500 fees, 6–8 weeks processing) is required on top of the building permit.
Weather exposure. Melbourne's variable climate means timber decks cop rain, frost, and UV in the same week. Quality timber and finishes matter more here than in northern cities. Products like
Intergrain UltraDeck ($31/L, 10–14 m2/L coverage) and Sikkens Cetol Deck Ultra ($45/L, 8–10 m2/L) are popular choices for Melbourne decks.
Balustrade requirements. Any deck over 1 metre above ground needs a compliant balustrade: timber ($200–$450/lm), wire ($350–$700/lm), or frameless glass ($280–$425/lm). Glass is popular on elevated eastern suburbs decks to preserve garden views.
Building permit. Almost all Melbourne decks need a building permit ($800–$2,500), plus a state levy of $1.28 per $1,000 of project cost for work over $10,000.
A small treated pine deck on a flat block in Tarneit or Craigieburn sits toward $3,400. A large spotted gum deck on a sloping block in Templestowe, complete with glass balustrade, heritage planning permit, and engineered footings, pushes toward $20,400.
Melbourne-Specific Considerations
Eastern suburbs. Doncaster, Glen Waverley, Templestowe, Vermont. Large blocks with sloping backyards drive demand for substantial decking projects. These suburbs have some of Melbourne's biggest residential decking budgets, with hardwood and composite builds being standard. Sloping sites often benefit from screw piles — same-day installation without the 3–7 day concrete cure wait, and better performance on the reactive clay soils found in parts of the eastern suburbs.
Inner suburbs and heritage zones. Fitzroy, Carlton, South Melbourne, Richmond. Smaller blocks, terrace-style homes, and heritage overlays. Decks often need to sit behind the main roofline and meet council design guidelines. A heritage impact statement may be required, adding $200–$500 per assessment. The Victorian Building Authority (VBA) registers builders for this work.
Bayside suburbs. Brighton, Sandringham, Hampton. Salt air accelerates timber weathering. Stainless steel fixings are essential (standard galvanised fixings corrode within a few years in coastal conditions), and marine-grade timber treatments extend the oiling cycle. Spotted gum's natural density makes it a strong choice for coastal builds.
Western and northern growth corridors. Tarneit, Werribee, Craigieburn, Mickleham. New-build estates with flat blocks, standard soil conditions, and good access. These are the most cost-effective locations for decking in Melbourne. Treated pine ($43–$50/m2) is common for family budget builds, with merbau ($73–$80/m2) as the step-up option. Most straightforward builds fall within building permit exemptions (under 10m2, under 1m, not attached to the house).
Climate factor. Melbourne gets more rain days than Sydney and significantly colder winters. Composite decking has gained ground here because it handles moisture without the maintenance cycle. If you choose timber, expect to oil or stain at least once a year to prevent greying and surface cracking — annual DIY oiling costs roughly $2.50–$4/m2 in materials.
Hiring a Licensed Carpenter in VIC
In Victoria, builders and carpenters must be registered with the Victorian Building Authority (VBA) for domestic building work. The relevant registration category is "Domestic Builder (Limited to Carpentry)" or "Domestic Builder (Unlimited)" for larger projects. Domestic Building Insurance (DBI) is mandatory for work over $16,000.
Ask for:
VBA registration number (search it on the VBA website)
Public liability and Domestic Building Insurance
A written contract for jobs over $10,000 (required by law in Victoria)
Timber species, treatment grade, and footing type specified in the quote
Confirmation of whether a building permit and/or planning permit is needed
Worth checking: No VBA registration, reluctance to provide a written contract, or suggesting you skip the building permit process.
How We Calculate
Estimates are based on current registered builder and carpenter rates across metropolitan Melbourne, adjusted for material costs in VIC. All prices include GST. Figures cover standard residential decking construction. Multi-storey decks, pool surrounds, and commercial projects may fall outside these ranges.