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What Size Granny Flat Can You Build on Your Property?

Written by:

Olivia James

What Size Granny Flat Can You Build on Your Property?

Building a granny flat is a smart move if you want to increase the value of your property and maximise your space. Granny flats can be used for various purposes, from hosting family and friends to generating rental income or creating a designated workspace.

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However, before diving into the design and construction, it is very important to understand the legal limitations associated with granny flats. Every council and state outlines specific rules regarding how big your granny flat can be, where you can build it, and what requirements your land must meet. 

In this article, we will take a look at what size of granny flats you can build and the minimum land size for granny flats in NSW. This guide breaks it all down so seamlessly that you can find ideal solutions to building a granny flat without overlooking the legal parametres. 

Understanding Granny Flat Size Regulations in NSW

Before you start planning your granny flat project, it is essential to understand that NSW has clear and specific regulations about the size of a granny flat. These rules are framed to ensure the safe and appropriate development of residential areas.

Under the NSW State Environmental Planning Policy (SEPP), the maximum external floor area allowed for a granny flat is 60 square metres. The 60m2 limit only refers to the sum of areas within the outer face of the external walls; outdoor areas such as patios, garages, and carports are generally considered separately. 

The minimum requirements to build a granny flat are:

  • You cannot have more than a maximum external floor area of 60 square metres.
  • Your granny flat must not exceed a height of 8.5 metres.
  • You need to have a private open space of at least 24 square metres for your granny flat.
  • You have to maintain a distance of 3 metres from any protected trees already present.
  • To be in regulation of all setbacks from roads, boundaries and existing structures, which differ depending on the property and council the land is situated.

These are not the only considerations. Other factors, including site conditions, existing buildings, and local council overlays, can also significantly influence what you can and cannot build. Working with Master Granny Flat ensures that your design meets both state and local requirements. This can save you time, money, and unnecessary complications during the approval process.

Minimum Land Size Requirement for Granny Flat in NSW

NSW legislation sets a minimum land size requirement to ensure that granny flats are only built on blocks that can accommodate them safely and suitably. In most cases, the minimum land size for a granny flat in NSW is 450m2 with a 12m frontage. If your lot is smaller than this, you are not eligible to build a granny flat. 

Before making any firm plans, Master Granny Flats offers a free on-site assessment, where we can help you understand both state and local council regulations pertaining to your land. 

Popular Granny Flat Option

Choosing the right size for your granny flat is important to ensure that your needs are met while staying compliant with NSW regulations. The maximum granny flat size limit in NSW is 60m2, but there are plenty of popular size options depending on your property space, budget, and use. 

The most common granny flat-size choice, being 60m2, allows the most versatility, offering features such as: 

  • Two well-sized bedrooms
  • Spacious living, dining, and kitchen areas
  • Full bathroom and laundry space

This option is perfect for small families or elderly parents who need an independent living space.

Why Understanding the Granny Flat Size Matters?

Understanding the permitted granny flat size is important when planning your project. It not only helps in meeting the legal requirements but also ensures that the investment adds value to your property and long-term goals. 

Understanding the granny flat size and planning regulations accordingly helps you:

  • Plan smarter designs that optimise available space.
  • Avoid costly mistakes and facing compliance issues.
  • Maximise property value by creating practical, attractive secondary dwellings.
  • Speed up approvals under the NSW Complying Development process.

Final Thoughts

When you are planning to build a granny flat, understanding the rules about the site and size limit is very important. Working with the experienced professionals at Master Granny Flats can not only help you comply with the regulations of the state but also create a functional space that adds value to your property. 

Contact us today to design a perfect granny flat for your property!

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