Decking Builders Melbourne
Real 2026 pricing per m², timber vs composite for Melbourne winter, and the sub-frame decisions that determine whether your deck lasts 8 or 25 years.
By George Giannakakis · B.Arch.Studies · M.Arch (UniSA) · RLA300580
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Melbourne's wet-cool winters and dry-hot summers are hard on timber decks. Composite lasts longer but costs more up front. This guide covers the real per-m² pricing, sub-frame engineering that determines deck lifespan, and how to spec a deck that survives 20+ years of Melbourne weather.
Timber vs composite for Melbourne
Timber (spotted gum, blackbutt, merbau): warm feel, cheaper up-front, ages to a silver-grey patina if left uncoated. Requires oil/stain every 12-18 months in Melbourne climate. Composite (Trex, Modwood, ArmadilloDeck): near maintenance-free, 20-25 year warranty, non-porous, resists moisture and mould. 40-55% more expensive up-front but cheaper total over 8+ years. Full comparison at /timber-vs-composite-decking-melbourne.
Sub-frame - the real longevity factor
Cheap timber joists rot within 8-12 years in Melbourne's wet winter. Insist on H3-treated hardwood, steel-galvanised joist tape and 400mm centres (400mm for composite, 450mm for timber). Ground contact bearers must be H4-treated. Poor sub-frame is the #1 cause of decking failure within 10 years.
BAL compliance for outer-Melbourne
Homes within a Bushfire Management Overlay (Yarra Ranges, Mornington hinterland, Cardinia, outer-east) need BAL-rated decking. BAL-12.5: standard hardwoods OK. BAL-19: FRL-rated timbers or composite required. BAL-29: only fire-retardant treated hardwoods or specific BAL-rated composite brands. Confirm your BAL before quoting.
Frequently asked questions
Merbau timber: 10-15 years with regular oiling. Spotted gum / blackbutt (H3-treated): 15-25 years with proper sub-frame. Composite: 20-30 years, 25-year manufacturer warranty. Deck lifespan is 60% sub-frame and 40% surface material - specifying joists well matters more than the top board choice.
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Disclaimer: Pricing ranges are Mar 2026 Melbourne market observations and indicative only. Actual costs depend on site conditions, block access, materials and finish level. BuildPilot is an independent home-build CoPilot and does not build or supply. Always obtain three fixed-price quotes on identical inclusions, verify Victorian building licences via Victorian Building Authority and check planning overlays via VicPlan.
The ongoing numbers
Indicative 2026 ranges, not quotes. All 66 items
- Balustrades on any fall over 1m, 1m high, no climbable gapsDecks, balconies and stairs. Older homes have 900mm rails and wide gaps.
- Stair rise and going within NCC limitsSteep 1950s-70s stairs and open risers often fail current geometry rules.
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