Victoria has some of the clearest deck-permit rules in Australia — but they're strict, and "the builder said we don't need one" is not a defence if you later sell, renovate or have an insurance claim. Here's what actually triggers a permit, and what doesn't.
When you need a building permit
Under Victoria's building regulations, a deck generally needs a building permit if any of these apply:
- It's attached to a building (your house, garage or pergola).
- It's more than 10 m² in area.
- Its finished surface is more than 500 mm above ground.
- It involves work that could affect the weatherproofing of your home (for example, cutting into a wall for a door onto the deck).
- It needs new stairways or sits over an easement.
In practice, most backyard decks in the inner west trip at least two of those. A tiny freestanding platform under 10 m² at ground level may be exempt — everything else, plan on a permit.
Siting rules that surprise people
Even with a permit, where you place the deck is regulated:
- Side and rear setbacks apply to raised decks, just as they do to buildings.
- Overlooking: a raised deck that looks into a neighbour's habitable-room window or private open space usually needs screening or a design change. This matters in dense pockets of Flemington, North Melbourne and Maribyrnong.
- Overlooking fences: a deck that effectively raises you above the fence line needs careful design, not just a shrug.
Which council are you in?
Decks in our service area fall mainly under Maribyrnong, Moonee Valley, Melbourne, Merri-bek, Hobsons Bay and Brimbank councils. The permit itself is issued by a registered building surveyor under state rules — councils mainly handle siting (ResCode) triggers and may require a report and consent for specific relaxations. An experienced builder handles this paperwork routinely; we do it on every job that needs it.
Who can build it
- Registered building practitioners (domestic builder registration with the VBA) must carry insurance and take out domestic building insurance for domestic work over $10,000.
- Owner-builders can do it with a permit and an owner-builder certificate of consent — but you carry the compliance and warranty risk yourself.
Ask any builder for their VBA registration number and their domestic building insurance certificate before signing. Legitimate builders produce them without blinking.
What it costs and how long it takes
A building permit for a typical deck runs roughly $500–$1,500 depending on size and complexity, and surveyors turn most straightforward residential applications around in 1–3 weeks. Permit fees are included in our fixed written quotes, so there's no surprise line item.
Budgeting the whole project? Our 2026 Melbourne decking cost guide covers the full numbers, and our timing guide explains why spring slots book out first.