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Writer's pictureMark Simon

How Much Is The Cost Of Building A Granny Flat?

Updated: Sep 13, 2023



Are you pondering upon the thought of using up the extra space in your house? Well, why not think about constructing a granny flat. Many people are now gravitating towards the idea of converting the extra space available in the house into a granny flat. This age-old concept has now received new popularity. People opt for this idea in order to use the extra space in their backyard or simply using up additional space to build some better structure.

There are different types of granny flats:

  • 1 bedroom granny flat

  • 2 bedroom granny flat

  • 3 bedroom granny flat

Based on the availability of space and the type of construction you want, you can create a granny flat. Make sure that you choose a good contractor for this task, for he will be converting your dream into reality. Hence, it becomes important for you to choose a professional and experienced contractor for this task.


Factors influencing the cost of building a granny flat:


While the concept is very popular, people have to think about their budget before going ahead. There are various factors that impact the cost of building a granny flat:

  • Type of granny flat- If you are planning to use up a small space, then you don’t have to pay as high as paying for a grandeur granny flat. Bigger the granny flat, higher will be the cost of its construction and vice-versa. Hence, you must check your requirement before finalizing the decision.


  • Designing- The designing part is important as it will decide the final look and appearance of your granny flat. Hence, you must discuss with your architect about the same. Simple designs won’t cost you much as compared to luxurious and intricate designs. However, even a simple-looking granny flat can be alluring; it all depends upon the way it has been constructed. Hence, a good contractor plays a key role in this.


  • Fixtures and furniture- What will add more to the cost is the fixture and furniture of the granny flat. You can spend as lavishly as you want or you can settle down with simplistic accessories. Make sure that you don’t compromise on the quality of furniture and fixture just to save few bucks.


  • Consultation fee- Another factor that can impact the cost of building a granny flat is the consultation fee of the architect or the contractor. Hence, you must chart out your budget in advance, and based on it you must proceed with the construction work.

Cost of building a granny flat:

  • 1 bedroom granny flat- If you have a smaller space, then you can opt for 1 bedroom granny flat. This is the basic type of flat that can be constructed in a smaller area. The cost of building 1 bedroom granny flat will range between $85,000 and $100,000 in Sydney.


  • 2 bedroom granny flat- So, you have a larger space and want to convert it into a granny flat, then a 2 bedroom granny flat would be a good option. You can use this space to accommodate your grandparents or your guests. The cost of building a 2 bedroom granny flat may range up to $130,000.


  • 3 bedroom granny flat- The next common design option is a 3 bedroom granny flat. This type of design is perfect for those who have ample space and want to convert it into a dwelling space for themselves or someone from the family. The price estimation of building a 3 bedroom granny flat may range between $150,000 and $180,000.


So, this was the basic information about the cost of building a granny flat. A lot of it depends upon the design and your contractor. So, you must always emphasize on choosing the best contractor for granny flat construction. Search on the internet or seek some references from your family and friends to hire the best contractor. So, if you have some extra space available, utilize it and add more value to your property by constructing a granny flat.

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