Is Building a Granny Flat Right For You?

You may think of it as old-fashioned, but adding a granny flat to your property can be a smart source of income under the right circumstances.

Looking at the pros and cons of investing in a granny flat

Australia’s housing affordability issue shows no signs of slowing down. Investors can take advantage of this by providing low-cost housing. Creating a “granny flat” is one way to use extra space in your own home to earn money. You can also add a granny flat as a separate building. Before you do, you should know what they are and the pros and cons attached to granny flats.

What is a Granny Flat?

A granny flat is a secondary home. As such, granny flats are living spaces built on the same land as a main dwelling. A granny flat is a self-contained space and most contain their own bedrooms, kitchen, bathroom and general living spaces. Investors have some choices in how they build granny flats. Some build a separate building, whereas others build an extension to the main property.

The Regulations

At the moment, property owners in South Australia, Queensland, and Victoria may not rent out granny flats to generate income. Investors can build granny flats and rent them out in all other areas of Australia. Some regions, such as New South Wales, have even made the practice easier. Let’s assume you can build a granny flat. What regulations do you need to keep in mind? Each state has specific guidelines to follow. You should talk to an expert or the local council to find out more about what these are. On a more general level, granny flats must meet the following requirements: • The flat is on property that already has zoning permission for residential use. • It is the only granny flat attached to the property. • The land area of the property as a whole is at least 450 square metres. • The person who owns the primary dwelling must also own the granny flat. • The living space may not exceed 60 square metres. This figure may vary by state. • The granny flat must have its own access point with no obstructions. How much can I save by refinancing?Use UNO's calculator to estimate your savings. Calculate Savings

The Pros of Granny Flats

Investing in a granny flat brings with it several advantages, including the following: • Affordability: Granny flats are usually less expensive than other investment properties. They allow investors to build property portfolios without lots of capital outlay. • Adding Value: Investors can add value to the main property using a granny flat. This can prove a bonus when selling the home. • Income: A granny flat will earn a regular weekly income. How much this will be varies depending on the flat’s size and location. • A Spare Room: Even if you don’t have a tenant, a granny flat can prove useful. You can use it as a comfortable space for visiting friends and relatives. How much can I borrow?Use UNO's calculator to estimate your borrowing capacity. Calculate Now

The Cons of Granny Flats

Granny flats are not without their disadvantages. There are two you need to keep in mind: • Unexpected Costs: Granny flats have the same pitfalls as other construction projects. You may get hit with unexpected costs along the way. Make sure you have money saved to cover them. • Tenants: You may have to deal with tenant complaints. As the granny flat is on your property, this can create some difficult situations.

Your Next Step

The information in this article is general in nature. Before moving forward you should seek professional help to find out more. To find out if you can refinance your home loan in order to build a granny flat, contact a UNO adviser. Book a call in with UNO

5 stars for our service reviews from clients

Book Call Now

UNO home loans

Try Plans, by UNO
Mortgage calculators completely reimagined
Get Started
Considering a purchase or refinance?

Try Plans by UNO

Mortgage calculators completely reimagined
Get Started
☎️ 🚫 No cold call promise

Related Articles

TESTIMONIALS

What our customers are saying

Catherine Merrett
November 6, 2025
5 stars for our service reviews from clients
My husband and I were incredibly nervous heading into the home-buying process. As first-time property investors, it felt like a monumental decision, and the learning curve seemed steep. However, Andrew Wyers and the entire team at UNO Home Loans completely changed our perspective. They made the process so much more enjoyable than we ever anticipated—it was surprisingly exhilarating! Andrew's exceptional communication was key. At moments when we felt uncertain or stressed (especially while juggling other life commitments), his guidance immediately put our minds at ease. We knew we were in safe hands with the UNO team and quickly learned to trust the process entirely, allowing us to learn along the way. Feeling guided through each step made a daunting task enjoyable, and within a matter of a couple of short months, we had achieved our goal: we were homeowners! Thank you so much to Andrew Wyers and the entire UNO Home Loans team for making this huge milestone a genuinely positive and seamless experience.
Read more
Margaret Giles
November 1, 2025
5 stars for our service reviews from clients
Due to complications arising from processes and forms required by the lender, what should have been a simple process became super complicated. UNO Home Loans dealt with everything with calm and serenity and professionalism.
Read more
David Norman
October 31, 2025
5 stars for our service reviews from clients
Outstanding service with almost daily check Ins to help us navigate a very complex process, thank you so much to Paul and team for your highly professional but also personal service to help us achieve our first home purchase in Australia. I highly Recommend Paul Davey for helping to achieve your next property purchase.
Read more
Jodie Simich
October 31, 2025
5 stars for our service reviews from clients
Paul was so helpful throughout the whole process of house purchase. We highly recommend his service :)
Read more
Beth Wells
October 29, 2025
5 stars for our service reviews from clients
Paul and the team at UNO Home Loans have been absolutely amazing, helpful and transparent during the process of purchasing our home. This team has made buying a house an absolute breeze. It has been a 9 year goal for my family and I to get back into the market and from the first zoom call with Paul all the way to settlement I have felt taken care of and at ease. I am so excited to be in our own home and am very grateful for how easy UNO made the experience. UNO offered great communication, clear instructions and got the job done. Thank you Paul and the UNO team. I will definitely be using these services again.
Read more
Mark Russell
October 27, 2025
5 stars for our service reviews from clients
Working with Scott Wilkinson at UNO Home Loans was a genuine pleasure. We used Scott to refinance our home loan and to structure an investment property loan. Both experiences were excellent from start to finish. Scott provided high quality advice, quick turnaround times and sharp pricing outcomes. Nothing was too much trouble. I look forward to using Scott’s services again and highly recommend to others.
Read more
Rudy Seubelan
October 25, 2025
5 stars for our service reviews from clients
Scott and the entire team at UNO has been skilfully in helping and assisted with my complex property financing structure in a such short time frame to execute my first investment property. He has engineered a powerful strategy to accelerate my investment property purchase while ‘Optimising’ my financial position efficiently. I couldn’t be happier with experience. They made the whole process smooth and willing to go extra mile to get me best deal possible. I highly recommend him to anyone looking for reliable and professional broker.
Read more
Wayne Simmonds
October 22, 2025
5 stars for our service reviews from clients
Great service, super responsive and Mike saved us hundreds of dollars by helping us switch to a great new rate. 100% recommend.
Read more
Jonathon Tanner
October 20, 2025
5 stars for our service reviews from clients
If only we could leave 10 stars... We've worked with Scott Wilkinson from Uno on the purchase of our principal place of residence, as well as a recently completed investment property. Scott was excellent throughout the entire process. He's got great communication, works incredibly hard and did everything he could to negotiate us the best deal. As business owners, the investment property was particularly complex and tricky to navigate. Scott helped us from start to finish and ensured we could maximise our borrowing capacity as well as secure a competitive rate. We've got nothing but amazing things to say about the guy and would highly recommend him to anyone considering buying property.
Read more
Gabe Windsor
October 18, 2025
5 stars for our service reviews from clients
Mike Parsons at UNO is absolutely fantastic to work with. He makes the entire home loan and refinancing process so easy and stress-free. Mike is incredibly responsive, proactive with follow-ups, and always goes the extra mile to make sure everything runs smoothly. He takes on all the heavy lifting and explains things clearly every step of the way. A great communicator who genuinely cares about getting the best outcome for his clients. Mike is my go-to mortgage broker, and I’ll continue to use his services for years to come. Highly recommend!
Read more
Kirstie Jenner
October 9, 2025
5 stars for our service reviews from clients
I honestly couldn’t recommend Paul Davey from Uno enough. He went above and beyond to get my pre-approval sorted, even with my tricky circumstances. He guided me through the whole process right through to settlement day and made everything so easy and stress-free. If you need a mortgage broker who actually cares and knows their stuff, he’s the one to call! Epic Service!
Read more
Pensive “Li” Pen
September 9, 2025
5 stars for our service reviews from clients
10/10 Stars Fantastic experience with Mike Parsons (and his team). Mike was quick to respond, explained everything clearly, and secured us a great rate with cashback. The whole refinance process was smooth and stress-free. Mike went above and beyond for us and exceeded all my expectations. 10 out of 10 Stars. Highly recommend!
Read more