Many homeowners assume you always need council approval before building a deck. The reality is more nuanced. Some decks are exempt from both planning and building permits, while others require one or both. This guide walks you through what actually determines whether you need approval, based on Victorian regulations and our experience building decks across Melbourne.
The 800mm height threshold
Under the Building Regulations 2018, a deck raised more than 800mm above natural ground level generally requires a building permit. Decks at or below 800mm are often exempt from building permit requirements, though other factors can still trigger the need for one.
This height is measured from the natural ground level to the top of the finished deck surface. On sloping blocks, this means part of the deck might be under 800mm while another section exceeds it, which can complicate the permit assessment.
Planning overlays that change the rules
Even if your deck is under 800mm, a planning permit might still be required if your property sits within certain overlays. Heritage overlays, design and development overlays, and neighbourhood character overlays can all impose additional requirements.
The best way to check is through your local council's planning maps or by calling the council directly. We can also help you navigate this during a site visit, as we are familiar with the overlay maps across Melbourne's west, Bayside, and the Mornington Peninsula.
Setback and boundary considerations
How close your deck sits to property boundaries can also determine whether approval is needed. Front setback requirements, side boundary setbacks, and rear boundary setbacks all come into play. If your deck encroaches into a setback zone, you may need a planning permit even if the deck itself is otherwise exempt.
For corner blocks or properties with multiple street frontages, setback calculations can be more complex. We always check these details during our site assessment so there are no surprises later.
Wondering if your deck project needs approval? We can check during a free site visit.
Book a Site VisitHow we handle it
When you book a site visit with us, we assess the permit requirements as part of the process. We measure the site, check the height, review any overlays, and advise you on what approvals are needed before we even start quoting. If a permit is required, we coordinate the application with a registered building surveyor and manage the process so you do not have to.
We have been doing this for over 15 years. We know what triggers a permit and what does not, and we keep you informed every step of the way.