A Melbourne homeowner might look at the backyard and start doing quick maths. If a granny flat could rent for a few hundred dollars a week, could it help cover the mortgage, support retirement income or make better use of the land?
That is a fair question. But the answer is rarely one fixed number.
Rent depends on the suburb, the dwelling size, the layout, privacy, parking, access, finish, utilities and the type of tenant likely to want that space. A granny flat that works well in one Melbourne suburb may perform differently only a few kilometres away.
So instead of asking only “what could it earn?”, it is better to ask “what could this granny flat earn on my block?”
Start with indicative rent, not a promise
Recent rental research prepared for M Plus found that comparable 1 bedroom secondary dwellings in Melbourne’s south-east commonly appeared around the mid $300s per week, with many examples sitting around $350–$400 per week. Some higher examples included utilities or extra features, which makes them harder to compare directly.
That is useful background, but it is not a rent guarantee.
The same research also showed why caution matters. The 2 bedroom granny-flat-style sample was too limited to rely on as a broad Melbourne range, while 3 bedroom examples were mostly whole-house comparables rather than confirmed granny flats.
For a public article, the safest way to use the data is as a starting point. It shows there is rental demand for compact secondary dwellings, but the actual rent still needs suburb and property context.
Our Rental Income Guide explains the broader rental factors behind the numbers.
Bedroom count matters, but it is not everything
A 1 bedroom granny flat may suit a single tenant, a couple, a student, a downsizer or a family member who wants privacy. It can also be easier to fit on a tighter block.
A 2 bedroom granny flat may appeal to a wider group of renters. The second room can work as a child’s bedroom, guest room, study or storage space. But the extra bedroom only helps if the site can support the larger layout without creating privacy, access or cost problems.
A 3 bedroom option may sound attractive from a rent perspective, but it needs more land, more budget and a stronger site fit. If the block is tight, the extra room may not translate into a better result.
For many owners, the best rental option is not simply the largest design. It is the design that fits the land, feels private and matches local tenant demand.
Suburb demand can change the result
Melbourne rent is not one market. Demand can change between suburbs and even between streets.
Rental appeal may improve when the property is close to:
- train stations or bus routes
- schools and universities
- hospitals or major workplaces
- shopping areas
- parks and local services
- suburbs with tight rental supply
The opposite can also happen. A granny flat may be harder to lease at a strong rent if it has poor access, no privacy, limited parking or a layout that feels cramped.
This is why a Melbourne-wide number is only a rough guide. A suburb and address review is more useful than a generic rent estimate.
Access, privacy and parking affect tenant appeal
A renter is not only comparing the bedroom count. They are imagining daily life.
Can they enter without walking through the main household’s private space? Is there enough separation from the main home? Do the windows face directly into the existing house? Is there a reasonable place for a car, bike or deliveries?
These details can affect how comfortable the dwelling feels. They can also affect how broad the tenant pool is.
This is where land suitability and rental return connect. A Land Eligibility Check is not only about whether a granny flat can fit. It can also help identify whether the block can support a layout that feels rentable.
Utilities and inclusions can change the comparison
Some rental listings include electricity, gas or water. Others do not.
That matters.
A higher weekly rent may look better at first, but if utilities are included, the owner may be carrying more of the ongoing cost. A lower rent where tenants pay their own bills may produce a different net result.
The same applies to furniture, parking, private outdoor space, heating and cooling, storage and laundry access. These inclusions can influence rent, but they also affect cost and maintenance.
When estimating rental income, compare like with like. Weekly rent is only one part of the return.
Weekly rent is not the same as real income
If a granny flat rents for $380 per week, the simple annual gross rent would be $380 multiplied by 52 weeks.
But real income can be lower after:
- vacancy
- property management
- maintenance
- insurance
- utilities if included
- repairs and replacement items
- finance or holding costs
That does not mean a granny flat is a poor investment. It means ROI should be calculated carefully.
If you want to test different cost and rent assumptions, the ROI Calculator can help you think through the numbers before relying on a simple weekly rent figure.
Approval and compliance still matter
Rental income only makes sense if the dwelling is properly planned and approved for its intended use.
In Victoria, small second dwelling rules may make some projects simpler, but the property still needs to be checked. A building permit is still part of the process, and site controls, title restrictions, services or overlays may affect what is practical.
Before treating rental income as part of your plan, check whether the land can support a suitable dwelling. Our Granny Flat Rules Victoria guide explains the broader rule framework.
What should you check before estimating rent?
Before relying on any rental figure, check:
- the suburb and comparable rentals
- 1 bedroom, 2 bedroom or 3 bedroom fit
- separate or clear access
- privacy from the main home
- parking or street parking conditions
- services and utility setup
- likely tenant type
- total project cost
You can also read How We Build to see how land check, design, budget and approval steps fit together.
The better first step
A granny flat can create useful rental income in Melbourne, but the useful number is site-specific.
The best first step is to check the land, then estimate rent and ROI using realistic assumptions for that suburb and layout.
Start with a Free Land Check. Send us your address and rental goal, and M Plus can review whether your property looks suitable for a rentable secondary dwelling before you spend time on the wrong design.
