State Environmental Planning Policy (Housing) 2021

Development for the purposes of a secondary dwelling or an ancillary structure must not result in a new building, a new part of an existing building or a new carport, garage, balcony, deck, patio, pergola, terrace or verandah having a setback from a rear boundary of less than the following—

for a lot with an area of at least 450m² but not more than 900m²—

3m, and

if the development results in a new or existing building with a height of more than 3.8m—an additional amount equal to 3 times the height above 3.8m, up to a maximum setback of 8m,

for a lot with an area of more than 900m² but not more than 1,500m²—

5m, and

if the development results in a new or existing building with a height of more than 3.8m—an additional amount equal to 3 times the height above 3.8m, up to a maximum setback of 12m,

for a lot with an area of more than 1,500m²—

10m, and

if the development results in a new or existing building with a height of more than 3.8m—an additional amount equal to 3 times the height above 3.8m, up to a maximum setback of 15m.

A dwelling on a lot with a rear boundary with a laneway may have a building line that abuts the boundary for up to 50% of the length of the boundary.