InsulWall and Granny Flats

The NSW Government has made granny flats easier and faster to build. These secondary dwellings also give families the chance to use a Granny Flat as a source of additional income in these challenging economic times.

Development of a granny flat can be considered upfront as part of building a new house or as an addition to an existing house.

A Granny flat is a self-contained extension of the family home that:

  1. is established in conjunction with a house and is either within the house, or attached to the house, or separate from the house; and
  2. is on the same lot of land as the principal house and is not on a separate lot, in a strata plan or in a community title scheme.

Granny flats are now permitted in all residential zones across the State, subject to meeting the following requirements:

  • There is only one house and one granny flat on the lot
  • The combined total floor area of the house and the granny flat complies with the floor space area controls in the local environment plan
  • The maximum floor area of the granny flat is no greater than:
    • 60 square metre
    • The maximum floor area prescribed by the council in the local environmental plan
  • The lot is not subdivided
  • The granny flat meets planning controls such as building height and setbacks, floor space ratios, and open space in the local environmental plan and/or the complying development provisions in the Affordable Rental Housing SEPP.
  • The granny flat meets the requirements of the Building Code of Australia.

There are no requirements under the policy to provide any additional parking for the granny flat.

A granny flat may occur either with DA consent, or as complying development.

When looking to build your granny flat, you can’t go past the InsulLiving® System. This System ‘is a fully engineered, BCA compliant Building System that is lightweight, straight forward and green’.


Insulwall Grannyflat