Granny flats are officially known as ‘Secondary Dwellings’ and may be located within, attached to, or separate from, the ‘Principal Dwelling’.

P J Cook has summarised the primary considerations for Complying Developments.

APPROVAL 

Granny flats may be approved in 10 days by a council or accredited certifier if the design meets the Complying Development provisions set out within the AHSEPP. 

ZONING

Granny flats can only be built in residential zones. 

OTHER DWELLINGS 

There can only be one principal dwelling and one secondary dwelling on each site. 

MINIMUM SITE AREA 

The minimum site area is 450m2. 

MAXIMUM FLOOR AREA 

The granny flat can have a maximum floor area of 60m2. 

FRONTAGE WIDTH 

12-metre-wide frontage to building line of the primary dwelling. 

PARKING 

There is no requirement for additional parking spaces to accommodate a granny flat. 

BASIX, BUSHFIRE AND FLOOD PLANNING 

BASIX, bushfire and flood planning requirements apply to the development of a granny flat. 

TREE CLEARANCE 

As a rule, maintain a 3-metre clearance from any existing trees over 4 metres in height. 

BUILDING CLEARANCES

1.8-metre clearance between class 1 buildings. You can build closer to class 1 buildings providing the relevant wall[s] within 1.8 metres are fire rated. It is important to note that you can build as close as 900mm to other structures such as garages. 

SETBACKS 

The setback of a site with a front boundary on a primary road or parallel road is equal to the average of the front setbacks of the nearest two dwelling houses on the same road. These dwelling-houses must be located within 40 metres of your lot. Otherwise, the setbacks are based on the lot size. There is a minimum setback of 3 metres from the rear boundary, 900mm from the side boundary and 4.5 metres from the front boundary.

The NSW State Environmental Planning Policy covers them (Affordable Rental Housing) 2009, commonly known as ‘AHSEPP’. For more information, go to www.planning.nsw.gov.au

If you need assistance working out if your block is suitable, don’t hesitate to give us a call or send us an email with your site address and we can do the leg work for you!