Is composite decking worth the extra cost in Melbourne?

Over 8+ years - yes. Total 8-year cost for a 30m² deck: timber $12,500-$27,400 (installed + maintained); composite $10,300-$18,200. Composite wins on lifecycle unless you enjoy oiling as a DIY project.

Do I need a permit for a Melbourne deck?

Decks over 500mm high need a building permit. Decks over 1m high need a compliant balustrade + engineering sign-off. Decks in heritage overlay or requiring council setback variation need a planning permit. Under 500mm high on residential zoning: usually no permit needed.

Researching·Find a Builder Cost Tracker

Independent Melbourne Guide

Decking Builders Melbourne

Name: BuildPilot Adelaide Building Industry Dataset
Creator: BuildPilot
License: https://buildpilot.com.au/terms

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.

Talk to BuildPilot Melbourne 1300 885 919

By George Giannakakis · B.Arch.Studies · M.Arch (UniSA) · RLA300580

Last reviewed: 5 March 2026 · How we research

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.

We are opening in Victoria

Get matched with vetted Melbourne specialists.

BuildPilot is preparing to open in Victoria. Join the waitlist and we will contact you first when the Melbourne matcher goes live.

Talk to BuildPilot Melbourne

Related Melbourne guides

Swimming Pool Builders Melbourne

Real 2026 Melbourne pool pricing, the Victorian pool safety laws that catch buyers out, and how to shortlist a pool builder before you sign a contract.

Verandah and Pergola Builders Melbourne

Real 2026 pricing, the Melbourne winter waterproofing that matters, and how to choose between verandah, pergola and covered outdoor room.

Outdoor Living Melbourne

The BuildPilot guide to designing a Melbourne backyard - pools, verandahs, decks and sheds coordinated as one project rather than four disconnected quotes.

Building in South Australia? See the Adelaide version of this guide →

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.