Do You Need a Permit to Put a Granny Flat on Your Property in Australia?

Adding a granny flat to your property is one of the most popular ways Australians are creating extra space whether for extended family, rental income, or a home office. But before you start sketching floor plans or calling builders, one big question needs answering:

Do you need a permit to build a granny flat?

The short answer is: Yes, in most cases, you will need approval.
However, the type of permit and the process depend heavily on your state, local council rules, and the specific design of your granny flat.

Let’s break it down.

What Is a Granny Flat?

A granny flat, also known as a secondary dwelling is a self-contained residential unit located on the same lot as a primary home. It typically includes:

• A bedroom

• Bathroom

• Kitchen

• Living area

• Separate entrance

In planning terms, it’s considered a secondary dwelling, not a separate title (unless subdivided, which is a different process entirely).

Do You Need Council Approval?

In almost every case across Australia, yes, some form of council or private certifier approval is required.

There are generally two approval pathways:

1️⃣ Development Application (DA)

A Development Application is the traditional approval process lodged with your local council. This is required if your granny flat:

• Exceeds size limits

• Doesn’t meet setback rules

• Is being built in a restricted zoning area

• Varies from local planning controls

A DA can take several weeks to several months depending on complexity and council workload.

2️⃣ Complying Development Certificate (CDC)

In some states, granny flats can qualify as complying development, which is a faster approval pathway if strict criteria are met.

For example:

• In New South Wales, granny flats up to 60m² may be approved under complying development rules if zoning, setbacks, and design standards are satisfied.

• In Victoria, regulations changed in recent years to simplify approvals for small secondary dwellings, though building permits are still required.

• In Queensland, rules differ by local council, and secondary dwellings often cannot be rented separately in some areas without meeting specific conditions.

A CDC is typically faster because it doesn’t require full council assessment but you must strictly comply with planning rules.

Do You Need a Building Permit?

Yes, always.

Even if your granny flat meets planning rules, you still need a building permit to ensure:

• Structural safety

• Electrical compliance

• Plumbing and drainage compliance

• Energy efficiency standards

• Fire safety requirements

A private building certifier or council building surveyor issues this permit.

Planning approval controls where and what you can build.
A building permit controls how safely it is built.

Both are important.

Key Rules That Affect Approval

While regulations vary across Australia, councils typically assess:

1. Size Limits: Most states cap granny flats at around 60–80 square metres.

2. Setbacks: You must maintain minimum distances from boundaries and the main dwelling.

3. Zoning: Your property must be zoned for residential use that permits secondary dwellings.

4. Parking: Some councils require additional off-street parking spaces.

5. Services: Water, sewer, and electricity connections must meet local authority requirements.

What About Renting It Out?

This is where rules get stricter.

In some states, granny flats can be rented out to anyone. In others, they may be restricted to family members unless certain conditions are met.

For example:

• New South Wales generally allows granny flats to be rented separately.

• Queensland may restrict rental arrangements depending on council planning schemes.

• Western Australia has updated policies encouraging small ancillary dwellings but still requires compliance with local planning frameworks.

Always confirm rental rules before assuming you can generate income from the property.

Are There Any Situations Where You Don’t Need Approval?

Very rarely.

Small sheds, studios, or non-habitable outbuildings under certain size limits may not require full planning approval but the moment you add a kitchen, bathroom, or sleeping facilities, it becomes a habitable structure and approval is almost always required.

Trying to build without approval can result in:

• Fines

• Stop-work orders

• Forced demolition

• Insurance complications

• Problems when selling your property

It’s simply not worth the risk.

Typical Approval Costs

While costs vary by location, you may need to budget for:

• Planning application fees

• Building permit fees

• Infrastructure contributions

• Service connection costs

• Professional drafting or design fees

Approval costs alone can range from a few thousand dollars to significantly more depending on complexity.

Final Verdict

So, do you need a permit to put a granny flat on your property?

Yes, in almost all cases.
You’ll typically need:

1. Planning approval (DA or CDC)

2. A building permit

3. Compliance with local zoning and development controls

The process isn’t impossible and many homeowners successfully add granny flats every year, but it must be done correctly.

Before committing to a builder or design, your first step should always be checking with your local council or a qualified town planner to confirm what’s allowed on your specific property.