Victorian planning resource · $39 planning report

Do I need a permit to extend my house in Victoria?

Good news for most Victorians: extending a single home in a residential zone often needs no planning permit at all. What changes that is an overlay on your land — or the mandatory garden area requirement. Here's what decides it, and how to check your property.

Victorian homeowners planning an extension, second storey or major renovation — who want to know whether a planning permit is needed before paying for design.

Check if you need a permit — $39 Free Property Snapshot

A single-home extension often needs no planning permit

For a single dwelling on a lot in a residential zone, extending or renovating usually does not need a planning permit on its own — the zone doesn't trigger one for a single home. A building permit is always required for the construction, but that's a separate process to town planning. This is the most common surprise for homeowners: the work is often a building matter, not a planning one.

What flips an extension into needing a planning permit is almost always one of two things: an overlay on the land, or the mandatory garden area requirement. Get past both and you go straight to a building permit.

A single dwelling on a lot generally needs no planning permit to extend — zone alone doesn't trigger one
A building permit is always required (separate to planning)
An overlay is the most common trigger for a planning permit
The garden area requirement still applies on lots over 400 m²
If a permit is needed, a single dwelling is assessed under Clause 54 (ResCode)
Two-or-more-dwelling sites are different — they're assessed under Clause 55

When an overlay brings a permit back

Overlays are the usual reason an extension needs a planning permit. A Heritage Overlay requires a permit for buildings and works (often even modest ones, especially to the front or a contributory building). A Neighbourhood Character Overlay, Significant Landscape Overlay, Design and Development Overlay, or an Environmental/erosion or Bushfire Management Overlay can all require a permit and impose design controls.

If a permit is required, a single dwelling extension is assessed against Clause 54 (ResCode) — the single-dwelling equivalent of Clause 55 — covering setbacks, site coverage, overlooking, overshadowing and private open space, read against the overlay's objectives.

The garden area requirement still applies

Even where no overlay applies, Victoria's mandatory garden area requirement bites on extensions. On a lot over 400 m², any extension must leave the required garden area intact — 25% for lots 400–500 m², 30% for 500–650 m², and 35% above 650 m². A big rear extension that eats into that garden area can't proceed without meeting the rule, and a permit can't be granted if it isn't met.

Check your property before you design

Whether your extension needs a planning permit turns almost entirely on your overlays and the garden area maths. Our $39 Victorian planning report identifies your zone and every overlay on your land, with a plain-English read on whether a permit is required.

Start free with the Property Snapshot to see your overlays in seconds — the quickest way to know if a permit is likely.

Real example

Worked example

A ground-floor rear extension to a single home on a 450 m² General Residential Zone lot with no overlays: no planning permit (just a building permit), provided the 25% garden area is kept. The same extension on a Heritage Overlay lot needs a planning permit assessed against the heritage controls.

The statutory basis

A single dwelling extension is assessed (where a permit is triggered) under Clause 54 (ResCode) of the Victoria Planning Provisions, made under the Planning and Environment Act 1987. Whether a permit is required is driven by the zone and any overlays (Clauses 43–45) and the mandatory garden area requirement in the residential zones (Clause 32). A building permit under the Building Act 1993 is always required separately. Always confirm the overlays for your address.

Clause 54 — ResCode (one dwelling)

Single dwelling on a lot

Overlays (Clauses 43–45)

Heritage, character, landscape, bushfire triggers

Residential zones (Clause 32)

Mandatory garden area requirement

Frequently asked questions

Do I need a planning permit to extend my house in Victoria?

Often no. For a single home in a residential zone, the zone alone doesn't trigger a planning permit — you usually go straight to a building permit. A planning permit is needed if an overlay applies (heritage, character, landscape, design, bushfire) or the work breaches the mandatory garden area requirement.

Do I need a permit for a second storey addition?

Same test as any extension: no planning permit for a single home unless an overlay applies or the garden area requirement is breached. Overlooking and overshadowing standards (under Clause 54, if a permit is triggered) matter more for a second storey, and a building permit is always required.

What if my house is in a heritage overlay?

A Heritage Overlay requires a planning permit for buildings and works — often even for modest extensions, particularly to the front or a contributory building. The extension is assessed against the overlay's heritage objectives.

Does the garden area requirement affect my extension?

Yes. On a lot over 400 m², your extension must leave the required garden area intact (25–35% depending on lot size). A large rear addition that eats into it can't proceed without meeting the rule — a permit can't be granted if it isn't met.

What's the difference between a planning permit and a building permit?

A planning permit is town-planning approval (zone, overlays, ResCode) and isn't always required for a single-home extension. A building permit is construction approval under the Building Act and is always required. Many extensions need only the building permit.

$39 planning report — ready when you are

A plain-English read on exactly what your property allows — zone, overlays and the rules that decide your project.