How Much Does It Cost to Build a Granny Flat? (Updated 2024)

NB: Pricing estimates are accurate at the date of publishing, but please be aware that prices will change over time. Contact us directly at 1300 160 320 for the most up to date information.

The cost of building a granny flat on your property in Australia can vary significantly. With all the benefits that adding a granny flat offers, such as a supplementary second income and additional property value, it is a worthy investment. They can provide the perfect solution for your kids who are growing older and want their independence or as private accommodation for a loved one when they come to visit. Or, perhaps you’re happy to rent it out and receive extra passive income. Building a granny flat allows additional living space to be added to your property without altering the main house. With so many options for backyard grannys, once you’ve decided to consider building one seriously, the next question is – how much to build a granny flat?

Granny flats will typically cost anywhere from $100,000 to $250,000. However, many factors can affect your overall granny flat prices. For example, would you like to build a single-storey or two-storey granny flat? How many bedrooms do you need? Would you like to custom design the perfect granny flat, or would you prefer a simplified process of ordering a flat pack kit home? You will also need to adhere to approvals and requirements from local councils. There are many options, depending on your land and your needs. This article will cover some variables in detail to help you make an informed decision.

How Much Does it Cost to Build Different-Sized Granny Flats?

Two-storey

Building 2-storey granny flats is possible! There are some changes to council regulations when your granny flat building height is over 3.8m, such as an amended rear and side setback. Once you know your property area can accommodate these building standards, consider constructing a 2-storey granny flat. Another council approval factor to be aware of is that the 60m2 maximum floor space you are permitted for a granny flat is spread out across the two levels of the 2-storey granny flat. You can split the 60m2 in various ways, so long as the total floor space doesn’t exceed the limit. You must also ensure the stairs are internal and included in the floor space.

You could expect to pay between $ 120,000 and $ 250,000. You should be wary if you receive a granny flat quote on the lower end of this starting price, as many necessary inclusions may be excluded from the final price. A more accurate estimate of granny flat prices of this size is between $220 000 and $250 000. This final range considers various necessities for your project, such as site costs, design and council approval, build price, and standard inclusions. Granny Flat Solutions has an expert team of experienced custom designers who maximise your space. If you’re after 2-storey granny flats, we will find the right solution to meet your needs and budget, and our prices are fully inclusive.

One-bedroom

A one-bedroom granny flat is an excellent way to maximise your use of space on your property. It is an ideal space for extended family members when they visit, older children who still live at home, or as a guest house. Standard, one-bedroom granny flats might range from 35m2 to 45m2, up to 60m2, starting at prices from $100,000.

This price tag includes the cost of standard fittings and professional construction from a reputable and licensed granny flat builder, Granny Flat Solutions.

Two-bedroom

Two-bedroom granny flats are a comfortable and convenient space for grandparents or Mum and dad to live as they age. They also make for an enjoyable living space for your guests while they’re visiting, as an alternative to paying for accommodation elsewhere or landing in your lounge room.

While two-bedroom granny flat prices vary from builder to builder, our prices start at $135,000. Make sure that you compare quotes carefully. Some granny flat companies will include plumbing, electricity, and other additional costs in their figures, while others do not. If you would like a custom-built, 60m2 two-bedroom granny flat, call us to speak with one of our granny flat experts, and we can discuss your options.

Granny Flat Prices in Different Areas

Learn more about the costs of building a granny flat in Greater Sydney, on the Central Coast, and Central Sydney and Illawarra.

How Much Does a Customised Granny Flat Design Cost?

Designing a granny flat could cost you anywhere from $6,000 to $20,000; however, when estimating granny flat prices, there is no quick answer. That’s because there are a lot of factors that will influence the price of building your granny flat.

Our custom design process has been simplified into a breakdown of 4 simple steps. In the first step, our site assessor will visit your property to assess your site conditions and listen to your ideas, needs & requests. They will then provide you with a customized, all-inclusive proposal and fee breakdown as your free site assessment and quote. This is an obligation-free quote, meaning it is of no cost to you! You’ll receive a quote for your complete custom-built granny flat, designed to meet your specifications and preferences and for all necessities such as local council fees, service connections, builder’s materials, fittings and more.

So, the bottom line may vary depending on what you’re after. You can build a granny flat with one bedroom or a granny flat with up to 4 bedrooms for your guests or tenants. You can build a single-storey or two-storey granny flat. We offer many different finishes and materials for your granny flat, tailored to suit your budget.

Site conditions, such as main sewer line encasements, extra service connections, sloping blocks, and limited site access, may affect the cost of building your granny flat. Fear not! Our site assessors come prepared before visiting your site. Any potential conditions incurring an extra cost will be communicated to you and included in your initial quote.

How Much Does It Cost to Build a House and a Granny Flat?

You might want to build a granny flat and the main home from scratch. Some businesses can do both, or like us, at Granny Flat Solutions, we pair with a sister company at New South Homes to bring you a package build. The total cost of your job will depend on the requirements for both the main building and flat. It’s estimated that in Sydney, the average cost to construct a 4-bedroom main property is $1,900/m2 to $3,900+/m2, depending on the level of finish, materials, and labour. Builders and architects often use a per square metre (m2) figure for the cost of a project. Then, you would need to factor in the additional granny flat cost.

Choosing to build the two living spaces together with a building company that pairs with granny flat builders would provide you with a seamless overall look for your home, as you could match the materials of your granny flat with the main building.

Are Granny Flats Worth The Price?

In short, yes! If you have a good block size and would like to maximise your use of the area you own, granny flats can provide you with many benefits. From being able to provide accommodation for a family member and loved ones to generate extra income by renting it out while also adding to your overall property value, building a granny flat on your block in Sydney is a fantastic option. The housing market in Sydney is growing more and more competitive as the area gives way to a high demand for housing with an ever-growing population. With that being the case, every square meter is highly valuable, and if you have the extra land, you could put yourself in the market and get a renter paying you in no time!

Granny flat prices are relatively low compared to the return on investment you will make. Adding a second stream of passive income can mean seeing a return on investment in as little as two years! If you have a good-sized block, it would be well worth speaking with a granny flat builder and exploring your options. You can begin the process and speak with a builder from Granny Flat Solutions today by calling our phone number at 1300 160 320.