Granny Flat Guide Victoria: Rules, Costs & Approvals (2026)

In Victoria a granny flat lives or dies on the planning scheme, not the listing. Check the zone, the overlays and the council’s rules yourself before paying a seller for a site’s development potential.

Secondary dwellings in Victoria

In Victoria’s planning system, a granny flat is a small second dwelling: a self-contained home on the same lot as an existing house, with a kitchen, a bathroom and a toilet. The term replaced the old dependent person’s unit in December 2023.

The small second dwelling rules are state-wide: they sit in the Victoria Planning Provisions and every council’s planning scheme. Your zone, overlays and any covenant or section 173 agreement on the title still decide what you can build, so check them for your property.

Amendment VC253 created the small second dwelling on 14 December 2023, with a limit of 60m². Amendment VC306 lifted the planning limit to 80m² on 15 October 2026, with matching changes to the building regulations to follow, so confirm the current size limit with your building surveyor. The Department of Transport and Planning’s small second homes page has the latest position.

Planning permit requirements

A small second dwelling normally needs no planning permit in a residential or rural zone. You need one if the lot is under 300m² in a residential zone, if the land is in a Rural Conservation, Green Wedge or Green Wedge A Zone, if a rural zone’s own setback or earthworks rules require one, or if an overlay or another part of the planning scheme does. Where a permit is needed, the process:

1. Lodge a planning permit application with supporting documents (plans, site analysis)
2. Council assessment, which may include a neighbour notification period
3. Council decision: approval, approval with conditions, or refusal
4. If approved, obtain a building permit before commencing construction

With or without a planning permit, you need a building permit. Where no planning permit is needed, the building surveyor checks the siting rules (setbacks, site coverage, overlooking and the like) as part of it. A council planner can confirm whether your project needs a planning permit.

ResCode and planning overlays

ResCode is Victoria’s state-wide residential development code, setting standards for setbacks, site coverage, overlooking, overshadowing, and open space. All secondary dwelling proposals must comply with ResCode (or receive a variation).

Common overlays affecting proposals:

• Neighbourhood Character Overlay (NCO): May restrict design or height. A small second dwelling up to 5 metres high, in muted tones and colours, needs no planning permit
• Heritage Overlay: No planning permit for a small second dwelling up to 5 metres high in muted tones and colours; anything taller or bolder needs a permit, heritage-sensitive design and officer approval
• Flood or Bushfire Overlay: Can trigger a planning permit and additional assessment, may restrict development
• Vegetation Protection Overlay: Limits tree removal needed for construction

Check the Planning Maps Online tool (planning.vic.gov.au) to identify all overlays applying to your property before starting design.

Lot size and zone requirements

For a small second dwelling, the number that matters is 300m²: on a smaller lot in a residential zone, you need a planning permit. Beyond that, zone conditions vary:

• General Residential Zone (GRZ): Most common in established suburbs. A small second dwelling normally needs no planning permit on a lot of 300m² or more, subject to the zone’s conditions and its minimum garden area requirement.
• Neighbourhood Residential Zone (NRZ): More restrictive for multi-unit development, but a small second dwelling is allowed and normally needs no planning permit on a lot of 300m² or more. The minimum garden area requirement applies here too; check your council’s schedule to the zone.
• Residential Growth Zone (RGZ): Encourages higher-density. A small second dwelling normally needs no planning permit on a lot of 300m² or more.

Contact your council’s planning department early to understand your site’s development potential before spending money on design.

Building costs in Victoria

Construction costs in Victoria are broadly similar to NSW but can be higher in inner Melbourne due to land constraints, builder demand, and heritage requirements.

Additional VIC-specific costs to budget for:

• Planning permit application fee, if you need a permit: $1,000 to $3,000+
• Planning permit consultant: $3,000 to $8,000 (recommended for complex sites)
• Heritage report: $2,000 to $5,000 (if heritage overlay applies)
• Soil and drainage report: $1,000 to $2,000

How long does approval take?

If your small second dwelling needs no planning permit, you go straight to the building permit. Where a planning permit is needed:

• Simple applications (no objections, no overlay): 2 to 4 months
• Notifiable applications (neighbour notification): 4 to 8 months
• Complex applications (overlays, objections, VCAT appeal): 12+ months

After the planning permit, you still need a building permit before construction. That adds another 4 to 8 weeks.

Where a permit is needed, Victoria’s planning process is meaningfully slower than NSW’s CDC pathway (typically 2 to 4 weeks). Factor this into your project timeline and budget.

Growth corridor opportunities

Melbourne’s urban growth corridors (Werribee, Melton, Cranbourne, Epping) are zoned for higher-density residential development. Secondary dwellings tend to be more readily approved because:

• Lots are often designed for dual occupancy from the outset
• Growth zones typically have simpler planning overlays
• Councils in growth corridors have established secondary-dwelling processes

Rental yields in outer growth corridors are typically lower than established inner and middle suburbs. Weigh up the cost savings on approval against the lower income potential.

Rental potential in Victoria

Rental returns for secondary dwellings in Melbourne:

• Inner Melbourne (5 to 15km from CBD): $350 to $550/week for a 1 to 2 bed dwelling
• Middle ring suburbs (15 to 30km): $280 to $420/week
• Outer growth corridors: $250 to $360/week

Given higher construction costs in Victoria (planning complexity), yields tend to be slightly lower than NSW on a cost basis. Still, secondary dwellings remain a popular strategy for Melbourne investors. Use our rental yield calculator to model your scenario.