An expandable home can potentially be approved for permanent residential use in Victoria. Its folding or factory-built format is not the deciding factor. The installed home must suit a permitted land use, satisfy the relevant planning controls and obtain the required building permit.
For some projects, Victoria's small second home provisions provide a useful pathway. A qualifying small second home is a self-contained dwelling of 60 square metres or less on the same lot as an existing home. Many do not require a planning permit, but Planning Victoria states that a building permit is always required.
Classify the proposal before choosing the pathway
Describe what the finished project will be, not only how it travels to site:
| Project question | Why it matters |
|---|---|
| Is it the main home or a second home? | The small second dwelling provisions require an existing home on the same lot. |
| What is the gross floor area after expansion? | A small second home must be 60 m2 or less. |
| Does it include a kitchen, bathroom and toilet? | These facilities form part of the small second home definition. |
| Will it be rented or occupied by family? | Planning Victoria permits either for a qualifying small second home, subject to applicable residential requirements. |
| Can it provide building-permit evidence? | The installed building must satisfy siting, structural, energy, fire-safety and other requirements. |
A 40ft transport form can expand beyond 60 m2, while a smaller model may sit below that threshold. Confirm the actual gross floor area rather than assuming eligibility from the product name.
Understand the small second home pathway
Planning Victoria's current guidance identifies these core characteristics:
- 01a gross floor area of 60 m2 or less
- 02location on the same lot as an existing home
- 03only one small second home on the lot
- 04kitchen, bathroom and toilet facilities
- 05no connection to reticulated natural gas
- 06no separate subdivision or sale from the main home
Anyone can live in or rent out a qualifying small second home. This is different from the older dependent-person's-unit concept and should not be described as a blanket granny-flat exemption.
Check planning permit triggers property by property
Many small second homes in residential and rural areas do not require a planning permit, but the exemption is conditional. The official applicant guide directs applicants to check the zone, overlays and planning scheme for the land.
Key questions include:
- 01Is the lot in a residential, rural, green-wedge or another zone?
- 02Is the residential lot smaller than 300 m2?
- 03Do bushfire, flood, heritage, environmental or design overlays apply?
- 04Does the proposal meet setback, height, garden-area and amenity requirements?
- 05Are earthworks, vegetation removal or other works separately controlled?
The Single Home Code explains the current Clause 54 and VicSmart context for relevant residential development. Generate a planning property report and ask the local council to confirm the current scheme provisions for the address.
A building permit is still required
Planning-permit exemption is not a no-approval pathway. A municipal or private building surveyor must assess the building-permit application for the installed dwelling.
Prepare to coordinate:
| Building-permit topic | Project evidence likely to be needed |
|---|---|
| Classification and approved use | Plans, room functions and project description |
| Structure and installation | Product engineering, site wind conditions, supports, footings and connections |
| Siting and amenity | Survey, setbacks, overlooking, daylight and private open-space response |
| Energy and weatherproofing | Project-specific thermal, glazing, insulation and envelope evidence |
| Fire and bushfire | Applicable construction and site response |
| Plumbing and drainage | Water, wastewater, stormwater and legal point of discharge information |
An overseas factory certificate, brochure or generic engineering set may inform the application but does not replace evidence accepted for the Victorian site and installed configuration.
Compare The Span 30 and The Horizon 40 against the rule
The Span 30 has a published expanded area of approximately 56.52 m2, while The Horizon 40 has a published expanded area of approximately 74.10 m2. The first figure is below the 60 m2 small-second-home threshold and the second is above it, but floor area alone does not confirm eligibility.
The property, existing dwelling, facilities, scheme controls, siting and complete approval evidence still determine the pathway. Use the direct model comparison to assess capacity and transport format, then have the planning and building pathway checked independently.
Use a two-part approval gate
- Step 01Ask council or a planning professional whether the use and development require a planning permit.
- Step 02Ask the appointed building surveyor what is required for the building permit and final occupancy pathway.
- Step 03Reconcile both responses with the supplier's current drawings and certification evidence.
- Step 04Confirm drainage, wastewater, access, foundations and delivery feasibility.
- Step 05Replace product-level allowances with written project scopes before contracting.
Do not schedule manufacture or transport merely because the proposal appears planning-permit exempt. The building permit, product evidence and site work can still require material design changes.
Prepare the next conversation
Share the property, intended use, existing home, candidate model and available site information through the Planning Assessment. ModuHaus can help structure the review, while council, the building surveyor and relevant practitioners must confirm the project-specific requirements.
Sources and further reading
Requirements change and can be applied differently by site and local authority. Check the current official sources and confirm your project with the relevant council, certifier or qualified professional.