What Is a Granny Flat?

Designed for one or two persons, a granny flat is a self-contained living area usually located on the grounds of a single-family home. A granny flat can be detached, or it can be attached to the other dwelling. It is sometimes called a granny flat because it is a popular way for families to accomodate ageing parents. 

Local councils dictate what the maximum size of a granny flat can be, nut they usually are no bigger than 60m2

In temperate Australia, the size can easily be extended or accentuated with vast alfresco outdoor areas.

Is Your Site Suitable?

To build a Granny Flat, you need to build a dwelling that’s no more than 60m² measured from external walls.

You will need to have a block of land that’s at least 450m², but sometimes compact Granny Flats can be built on smaller sites – especially where there’s an option of building two levels.

How much does a Granny Flat cost?

The cost of building a Granny Flat is varied in the same way that the cost of a new build home can be wide-ranging. Your specific site needs, building access, design and finishes all impact the budget for your Granny Flat build.

• Pre-built Granny Flats from kit home builders usually start at about
$80,000 for 60 square metres. • At the higher end, a built to order Granny Flat can cost about $170,000 and take between three and four months to complete.

A typical 60m² Granny Flat is somewhere in-between, costing about $130,000.

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