Victorian rules around granny flats and small second dwellings are more nuanced than most people realise, and they vary significantly between councils. This guide walks older Victorians through the key planning and building questions — from permit exemptions to dependent person units — and flags the family and Centrelink considerations worth sorting out before a single brick is laid.
Why Victorian granny flat rules are not one-size-fits-all
Victoria does not have a single, universal rule that says 'build a granny flat and no permit is needed.' What exists is a layered system: the state's Victorian Planning Provisions set a framework, and individual councils apply that framework through their local planning schemes. The result is that a small second dwelling that sails through approval in one municipality may require a full planning permit application in the next suburb over.
For older Victorians — whether they are thinking about building a self-contained unit in the backyard for a parent, or moving into a compact dwelling on their adult child's land — understanding which layer of the system applies to their specific property is the essential first step. Skipping that step and assuming it is straightforward is where many families run into expensive delays.
The good news is that the system has become more permissive over recent years, with state-level reforms intended to make it easier to add secondary dwellings to established residential lots. But 'more permissive' does not mean 'no rules.' Checking current requirements with your local council or a registered town planner before committing to any design is genuinely worthwhile.
What does Victorian planning law say about small second dwellings?
Under the Victorian Planning Provisions, a 'small second dwelling' is a specific planning use category that can, in certain residential zones and under certain conditions, be built without a planning permit. The state framework has set size thresholds — expressed as maximum floor areas — that determine whether a permit exemption applies. Rather than quoting a figure here that may have since changed, the right approach is to look up the current threshold directly on the Department of Transport and Planning website at planning.vic.gov.au, or ask your council's planning department to confirm it in writing.
To access a permit exemption, a property typically needs to meet several conditions simultaneously: it must be in an eligible residential zone, the lot must meet a minimum area requirement (again, check the current figure), there can generally only be one existing dwelling on the lot, and the second dwelling must not exceed the applicable floor area threshold. If any one of those conditions is not met, a planning permit is likely required.
It is also worth knowing that even where a planning permit is not required, a building permit almost always is. These are two separate approvals from two separate authorities. Planning permits come from council; building permits come from a registered building surveyor (private or council-engaged). Both need to be satisfied before construction begins. The Victorian Building Authority at vba.vic.gov.au is the right starting point for understanding the building permit side of things.
How much does council variation actually matter?
Quite a lot, in practice. While the state framework provides the baseline, councils can apply overlays — heritage overlays, neighbourhood character overlays, vegetation protection overlays and others — that add permit requirements on top of the state-level exemptions. A property in an area with a significant landscape overlay, for example, may need a planning permit even if the dwelling size would otherwise be exempt under the standard rules.
Some councils have also been more proactive than others in updating their local planning schemes to reflect state-level reforms. This means that the experience a neighbour had three years ago may not reflect what applies today, and it certainly may not reflect what applies on a different street or in a different suburb. The only reliable way to know is to contact your council's planning department directly, describe the property and the proposal, and ask what triggers apply.
Many councils offer a pre-application advice service — sometimes free for an initial query, sometimes with a modest fee. For a project as significant as a second dwelling, taking advantage of that service before engaging a designer or builder is sensible. It can save months of redesign work if an overlay or setback requirement turns out to affect the project.
What is a dependent person's unit, and is it different?
A dependent person's unit is a distinct planning use category in Victoria, separate from a small second dwelling. It is intended specifically for a person who is dependent on the residents of the main dwelling — typically an elderly parent or a person with a disability — and it is generally a relocatable or prefabricated structure rather than a permanent construction. Historically, this category had its own permit exemptions and conditions, and it often required the structure to be removed once the dependent person no longer needed it.
The dependent person's unit rules have evolved alongside broader secondary dwelling reforms, so the current conditions — including what 'dependent' means in a planning sense, what structures qualify, and what removal conditions apply — should be confirmed with your council using up-to-date information. Do not assume older advice about dependent person's units still applies exactly as described.
For families where the arrangement is specifically about caring for an older parent, the dependent person's unit pathway has sometimes been more accessible than the small second dwelling pathway, particularly on smaller lots. A town planner familiar with your council's scheme can advise which category better fits your situation.
Building on a child's land: the family arrangements worth documenting
One of the more common arrangements for older Victorians is moving onto land owned by an adult child — contributing money to build a dwelling, or funding a significant renovation in exchange for a right to live there. These arrangements feel natural within families, but from a legal and financial-assistance perspective, they carry real complexity that is worth addressing before any money changes hands.
Centrelink uses the concept of a 'granny flat interest' to describe a situation where a person transfers assets (typically a lump sum of money or property) in exchange for a right to accommodation for life. This is not about a physical granny flat specifically — it is about the financial arrangement. Services Australia has specific rules about how granny flat interests are assessed for age pension purposes, and whether the transfer is treated as a gift (which can affect pension entitlements) or as a recognised granny flat interest (which is assessed differently). The details are on the Services Australia website and the rules have income and asset thresholds that change; always check the current position directly.
The critical point for families is that informal arrangements — a verbal understanding that 'we'll build a unit and you can live there forever' — are not the same as a documented granny flat interest. If circumstances change (the child's relationship breaks down, the property is sold, the child passes away), an undocumented arrangement may leave an older parent with no legal protection. A solicitor experienced in elder law or estate planning can help draft an agreement that protects everyone's interests. This is not a step to skip in the interest of keeping things simple within the family.
Practical steps before you commit to anything
Start with a title search on the property to understand its zoning and any overlays. Your council's planning department can help interpret what those mean for a secondary dwelling proposal. Some councils have interactive mapping tools on their websites that let you look up a property's zone and overlays before you even make a phone call.
Once you have a sense of what the planning framework allows, talk to a registered building surveyor early — not just an architect or builder. The building surveyor will flag any Building Code of Australia requirements that affect the design, including bushfire attack level ratings if the property is in a designated bushfire-prone area, and energy efficiency requirements that apply to new dwellings. These can have a meaningful effect on construction costs and design options.
For the financial and legal side of any arrangement involving transferring money or assets, independent advice from a solicitor and, if pension entitlements are involved, a financial adviser who understands Centrelink rules, is genuinely important. The National Disability Insurance Scheme and aged care system also have rules that can interact with granny flat interests if the older person's care needs change over time. Getting proper advice upfront is considerably less costly than unwinding a poorly structured arrangement later.
Accessibility and liveability: thinking ahead for the long term
A compact second dwelling that works well at 70 may not work as well at 82. When planning the design, it is worth building in features that support ageing in place: wider doorways, a step-free entry, a bathroom that can accommodate grab rails or a future shower chair, and adequate turning space for a walker or wheelchair. These features are far cheaper to include during construction than to retrofit later.
The Livable Housing Australia guidelines, while voluntary, provide a practical framework for what makes a dwelling genuinely accessible over time. Your designer or builder should be familiar with them. Some council planning schemes also reference accessibility requirements for secondary dwellings, so check whether any apply.
For couples, thinking about what happens if one partner's mobility changes significantly is a practical, not a pessimistic, exercise. A dwelling designed for two active people may need to function for one person with higher support needs within a few years. Discussing this with the designer at the outset — rather than after the plans are drawn — tends to produce better outcomes.
Key takeaways
- Victoria's small second dwelling rules operate in layers — state framework plus council overlays — so the only reliable way to know what applies to your property is to check with your local council directly.
- A planning permit exemption and a building permit exemption are two separate things; even permit-exempt second dwellings almost always require a building permit from a registered building surveyor.
- Size thresholds and lot area requirements for permit exemptions exist in Victorian planning law, but the figures can change — always verify the current numbers at planning.vic.gov.au or with your council.
- A dependent person's unit is a distinct planning category from a small second dwelling, with different conditions; confirm which pathway suits your situation with a town planner.
- Informal family arrangements to live on a child's land in exchange for a financial contribution are not the same as a legally documented granny flat interest, and the difference matters significantly for Centrelink pension assessments.
- Building accessibility features — step-free entry, wider doorways, a flexible bathroom — into a second dwelling from the start is far less costly than retrofitting them after construction.
Recommended partners and links
Indicative prices only — always confirm with the operator before booking.
Frequently asked questions
Do I need a planning permit to build a small second dwelling (granny flat) in my backyard under current Victorian council rules?
It depends on your property's zone, lot size, the floor area of the proposed dwelling, and any overlays that apply to your land. Victoria's state planning framework allows small second dwellings without a planning permit in certain residential zones when specific conditions — including a maximum floor area threshold — are met. However, council overlays such as heritage, neighbourhood character or vegetation protection overlays can add permit requirements on top of those state-level exemptions. The only way to know for certain what applies to your specific property is to contact your local council's planning department and ask. Even if no planning permit is needed, a building permit from a registered building surveyor is almost always required. Check current rules at planning.vic.gov.au.
What is the difference between a small second dwelling and a dependent person's unit in Victoria?
A small second dwelling is a self-contained residence that can, subject to conditions, be occupied by anyone. A dependent person's unit is a separate planning use category specifically for a person who is dependent on the residents of the main dwelling — typically an elderly parent or someone with a disability — and is generally a relocatable structure with conditions that may require its removal once the dependency ends. The permit exemption conditions for each category differ, and the rules have evolved over time, so it is important to confirm current requirements with your council or a registered town planner rather than relying on older advice.
How does Centrelink treat money I give my child to build a granny flat on their land?
Centrelink uses specific rules around what it calls a 'granny flat interest' — an arrangement where you transfer assets in exchange for a right to accommodation for life. Whether the transfer is assessed as a gift (which can affect your age pension) or recognised as a granny flat interest (which is assessed differently) depends on the details of the arrangement and current Services Australia rules. Thresholds and assessment methods can change, so you should check the current position directly with Services Australia at servicesaustralia.gov.au or by calling Centrelink, and seek advice from a financial adviser who understands Centrelink rules before any money changes hands.
Do I need a legal agreement if I move into a dwelling on my child's property?
A legal agreement is strongly advisable. An informal understanding that you can live there is not the same as a documented granny flat interest or a formal right of occupancy. If circumstances change — such as the property being sold, a relationship breakdown, or the death of your child — an undocumented arrangement may leave you with no legal protection. A solicitor experienced in elder law or estate planning can help draft an agreement that protects your interests and is also properly structured for Centrelink purposes. This step is worth taking before any money is transferred or construction begins.
Can my council refuse a second dwelling even if it meets the state planning exemption conditions?
Yes, in certain circumstances. If your property has an overlay — such as a heritage overlay, significant landscape overlay, or neighbourhood character overlay — that overlay may require a planning permit regardless of whether the state-level exemption would otherwise apply. Council overlays are applied through local planning schemes and can vary considerably between municipalities. Checking your property's overlays before finalising any plans is an essential step. Your council's planning department or an interactive mapping tool on the council website can help identify what overlays affect your land.
Got a tip, a price update or a story from this route? The community would love to hear it.
Share your views on our Facebook page— Seniors and Solo Traveller Stories
