Property investing
Building a Granny Flat in Victoria
Do you actually need a planning permit, when VicSmart can fast-track one to 10 business days, and the building-permit and gas rules that apply either way.
Key points
- A "small second dwelling" up to 60 square metres generally doesn't need a planning permit on a lot of 300 square metres or more — but a building permit is always required regardless, and it can't be subdivided or sold separately.
- Under 300 square metres, a planning permit is required — but VicSmart can decide an eligible application within 10 business days, with no advertising or objector appeals.
- It must not be connected to reticulated natural gas, a strict rule with no exemption — design it all-electric from the outset.
- The building-permit requirement never goes away, whatever the planning-permit position — verify your building surveyor against the public practitioner register.
- It can be rented out to anyone, not just family — see the companion guide on renting one out once it's built.
What you're actually allowed to build
Victoria's planning system calls it a small second dwelling — the formal term for what's commonly called a granny flat: a self-contained residence with its own kitchen, bathroom and toilet, no more than 60 square metres, built on the same lot as an existing home (Department of Transport and Planning (Victoria), verified 20 Aug 2026). Two hard limits apply regardless of anything else: it can't be subdivided or sold separately from the main home, and it must not be connected to reticulated natural gas — more on both below. A separate, different category — a dependent person's unit, a movable building specifically for someone dependent on a resident of the main home — follows its own transitional rules; check with your council if that's genuinely a closer fit than a permanent small second dwelling.
Do you need a planning permit?
Since Amendment VC253 (14 December 2023), a small second dwelling generally doesn't need a planning permit in residential and rural zones, provided there's no flood, environmental or other special planning control on the land (Department of Transport and Planning (Victoria), verified 20 Aug 2026). The genuine catch is lot size: on a residential-zoned lot under 300 square metres — specifically in the Residential Growth, General Residential, Neighbourhood Residential, Housing Choice and Transport, Mixed Use or Township zones (Department of Transport and Planning (Victoria), verified 20 Aug 2026) — a planning permit is still required, assessed against the Clause 54 residential development provisions. On a lot of 300 square metres or more, that step generally falls away and only the building-permit process applies (Department of Transport and Planning (Victoria), verified 20 Aug 2026).
If you do need a permit, VicSmart can fast-track it
A planning permit doesn't automatically mean the slow, advertised process most people picture. VicSmart decides eligible applications within 10 business days, with no public advertising and no third-party objector appeal rights (Department of Transport and Planning (Victoria), verified 20 Aug 2026). Your small second dwelling qualifies if the design meets the relevant Clause 54 standards — street setback, building height, side and rear setbacks, the specific building-setback and safety/accessibility standards for small second dwellings, and not overshadowing a neighbour's solar panels or existing windows among them (Department of Transport and Planning (Victoria), verified 20 Aug 2026). Meeting a standard is enough on its own — the council isn't required to weigh it against other planning-scheme policy once it's met, which is exactly what makes the process fast. Designing to clear every VicSmart standard up front, rather than finding out after lodging, is the single biggest lever you have over how long approval actually takes.
Common mistake: assuming a lot under 300 square metres rules out a fast approval entirely. It rules out the no-permit pathway, not necessarily a fast one — VicSmart exists precisely for this situation, provided the design meets its standards.
The building permit: always required, no exceptions
Whatever the planning-permit position, a building permit is always required to construct a small second dwelling, assessed by a registered building surveyor against siting, amenity, design and safety requirements (Department of Transport and Planning (Victoria), verified 20 Aug 2026). Check any building surveyor or builder you engage against the Building and Plumbing Commission's free public practitioner register before you commit — it shows current licence status and any past disciplinary or prosecution action (Building and Plumbing Commission (Victorian Building Authority), verified 29 Jul 2026). See checking a builder or developer for the fuller due-diligence process, most of which applies here too.
Design it all-electric from the start
A small second dwelling must not be connected to reticulated natural gas — an absolute rule under Amendment VC253, with no exemption regardless of whether a planning permit was needed at all (Department of Transport and Planning (Victoria), verified 20 Aug 2026). Budget for induction cooking and an electric or heat-pump hot-water system from the design stage, not as a retrofit. It also matches the direction the rest of the state is heading: from 1 January 2027, all new Victorian homes must be built all-electric, and from 1 March 2027, gas hot-water systems in existing homes must be replaced with an electric alternative once they reach end-of-life (Department of Transport and Planning (Victoria), verified 20 Aug 2026) — a small second dwelling built today is simply starting where the rest of the state is required to end up.
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Once it's built
A small second dwelling can house a family member, but it can also be rented out to anyone, including someone entirely unrelated to you — see renting out a granny flat in Victoria for the utility-billing rules, the same gas restriction from the tenant's side, and how a tenancy dispute is actually decided once it's tenanted.
Frequently asked
Do I need a planning permit to build a granny flat in Victoria?
Usually not, if your lot is 300 square metres or more and there's no flood, environmental or other special planning control on the land. Under 300 square metres, you generally do — though you may qualify for VicSmart, a fast-tracked 10-business-day process, if the design meets specific setback, height and overlooking standards.
Do I need a building permit either way?
Yes — always, regardless of whether a planning permit is required. It's a separate process, assessed by a registered building surveyor, not something the planning-permit exemption removes.
Can I connect it to mains gas?
No. A small second dwelling must not be connected to reticulated natural gas — an absolute rule with no exemption, so design it all-electric (induction cooking, an electric or heat-pump hot-water system) from the outset.
Can I subdivide it or sell it separately later?
No. A small second dwelling can't be subdivided or sold off separately from the main home — it stays part of the one title. If separate ownership is the actual goal, that's a different, more involved subdivision process, not this pathway.
Practical checklist
Before you design or apply
- Measure your actual lot size and confirm which zone applies before assuming the no-permit pathway applies
- If a planning permit is required, design to meet every VicSmart standard up front rather than finding out after lodging
- Confirm your building surveyor's current registration on the public practitioner register
- Design all-electric from the outset — no reticulated gas connection is allowed
- Decide up front whether it's for family, a tenant, or both, and read the renting-out guide before finalising the design
Questions for a professional
- Given our actual lot size and zone, do we need a planning permit, and would VicSmart apply?
- Which specific Clause 54 standards does this design meet or fail, and what would it take to meet all of them?
- What's your current registration status, and can you provide it in writing?
Official resources
- Planning Victoria: Small second homes
- Planning Victoria: Single home code (Clause 54, VicSmart)
- Planning Victoria: Victoria's Gas Substitution Roadmap
Important limitations: General information for Victorian property owners, not personal planning, building or legal advice. Planning and building requirements for small second dwellings have changed several times since December 2023 and vary by council and by the specific land — confirm current requirements with your local council and a registered building surveyor before building one.
Sources and methodology
- Small second homes — Department of Transport and Planning (Victoria) (retrieved 20 Aug 2026). Licence: CC BY 4.0
- Single home code — Department of Transport and Planning (Victoria) (retrieved 20 Aug 2026). Licence: CC BY 4.0
- Victoria's Gas Substitution Roadmap — Department of Transport and Planning (Victoria) (retrieved 20 Aug 2026). Licence: CC BY 4.0
- Find a practitioner — Building and Plumbing Commission (Victorian Building Authority) (retrieved 29 Jul 2026, last checked 7 Aug 2026). Reuse terms: see the publisher's site
Figures on this page are drawn from Delora's local knowledge graph, refreshed from these primary sources and checked for changes on a regular schedule. If a figure here looks out of date, the official source above is always the authority — please let us know.
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