How to Build a Deck in Melbourne: 2026 Homeowner Guide

A well-built deck turns an unused, sloping or uneven backyard into flat, usable outdoor living space. In Melbourne, where we get four seasons in a day, decking also lifts you off damp ground, drains quickly after rain and pairs naturally with a pergola or verandah for year-round use.

This guide pulls together what we've learned building timber and composite decks across Melbourne for more than 30 years — so you can plan your project, set a realistic budget and ask any deck builder the right questions.

As a rough guide, a professionally built ground-level timber deck in Melbourne usually costs around $350–$600 per square metre installed, while elevated decks, composite boards and complex sites sit higher — often $600–$1,000+ per square metre.

The biggest price drivers are height off the ground (which affects footings, bracing and balustrades), board choice, site access, demolition of an old deck, stairs, and whether you add built-in seating, lighting or a pergola. Every site is different, so the only reliable number comes from a free on-site measure and quote.

Merbau is the classic Melbourne decking timber — dense, stable and a rich red-brown that deepens with oil. It's a great all-rounder for backyard decks.

Spotted Gum is a tough Australian hardwood with beautiful natural variation. It carries a high bushfire rating (BAL-29 in suitable profiles), making it popular in the leafy eastern and north-eastern suburbs.

Composite decking (Trex, Ekodeck, NewTechWood, Modwood) costs more upfront but won't need oiling, won't splinter and resists fading — ideal for pool surrounds, busy families and low-maintenance homes.

Under Victoria's building regulations, a deck generally needs a building permit if it's more than 800mm above natural ground level, larger than 20 square metres, attached to a dwelling in certain situations, or sits close to a boundary. Pool decks and decks with roofed pergolas often need a permit too.

Rules and overlays vary by council, so we check every job before quoting and handle the building surveyor, engineering and permit paperwork for you as part of the build.

Great decks start underneath. We set concrete or screw-pile footings to engineered depths, use H4/H5 treated or steel subframes, keep joist spacing to manufacturer specs and leave ventilation gaps so boards stay dry and stable.

Boards are fixed with stainless screws or hidden clip systems, ends are sealed, and timber decks are oiled on completion. Balustrades and stairs are built to the National Construction Code and Australian Standards.

Popular ideas include multi-level decks for sloping blocks, wrap-around decks that connect indoor and outdoor rooms, pool decks with flush edges, and decks paired with a pergola, alfresco kitchen or built-in bench seating.

Think about sun direction, privacy screening, where the barbecue lives and how the deck flows from your kitchen or living room — those decisions matter more than board colour.

Ask to see recent decks in person or in a detailed portfolio, confirm the builder is registered and insured, and check Google reviews. A good builder will explain footings, subframe, fixings and permits — not just board price.

Deck It Out Decks & Pergolas is led by Marc, a hands-on builder with 30+ years' experience across Melbourne's eastern and northern suburbs, rated 4.9 stars by our clients.

Timber decks look their best with a clean and re-oil every 12–18 months — more often on full-sun, north-facing decks. Composite decks just need a wash with warm soapy water a couple of times a year.

Keep gaps between boards clear of leaves, check fixings each spring and deal with any drainage issues early to get decades out of your deck.