How Big Should a Granny Flat Be?

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Heather Jones
Heather Jones
I'm Heather, an author passionate about home improvements. My writing is your guide to making homes better. Let's explore easy ways to enhance your living spaces, from small fixes to exciting projects. Join me on a journey of making your house a cozy and stylish haven.

A granny flat is a smart secondary dwelling that can offer great ROI and helps offset your mortgage faster. You can choose to have an ordinary Granny Flats Design or something that looks like a beautiful mini home with various features. There are many benefits of such an addition. It can generate additional rental income, reduce the pressures of mortgage payments, provides access to greater tax depreciation, keeps family closer, increases your property’s value, and spreads income risk. When building a granny flat, you have to consider the size limitations. This guide provides you with a clear idea of how big your flat can be.

Size of Your Granny Flat

The size of a granny flat depends on the regulations of your local council. As a general rule, the building should be at least 40 square meters in size. The maximum allowed size can range between 50 and 100 square meters.

You should design your granny flat based on your budget and personal style preferences. Its size and design should also fit in with your home’s style and layout. Council requirements usually mention a minimum land size before permission is granted. 

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The minimum and maximum requirements in different states in Australia are as follows:

  • NSW: You should have at least 450 square meters of land for building a granny flat.
  • Western Australia: Granny flats are limited to 70 square meters in size.
  • Queensland: The Granny Flats Gold Coast structure can be no more than 80 square meters in size. There may not be a need for approval if the person is already living in your home.
  • South Australia: The maximum size limit is 50 square meters and the detached dwelling must not have a full kitchen and laundry area.
  • Victoria: Any dwelling, including granny flats, of more than 300 square meters will be assessed for the safety and security of the structure before construction.
  • Northern Territory: The type of zone determines the maximum size limit to be 80 or 50 square meters.
  • Australian Capital Territory: The maximum allowed gross floor area for the flat is 70 square meters.
  • Tasmania: Any extra dwelling should be limited to a floor area of 60 square meters.

Size of Granny Flat Bedrooms

While there are no limitations on the size of granny flat bedrooms and bathrooms, it is important to keep them within limitations based on the size of your flat. Your Granny Flats Sydney Builder can assist you in making these size decisions.

  • A standard bedroom size is around 3mX3m
  • You should consider personal requirements when choosing the bedroom size
  • The bedroom must have an access door, windows, electrical fittings, ventilation, at least 10% of open floor area, and smoke alarms
  • Consider the space for furniture and comfortable egress
  • The granny flat bedroom should be at least 2.77 square meters in size
  • While a wardrobe is not required, it is expected
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Similarly, it is recommended to have a bathroom that is at least 2mX2m in size. So, keep all these size requirements in mind when it comes to your Granny Flats Design. The right professional guidance should help you make the right decisions that help create an efficient and well-designed granny flat.

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