State Environmental Planning Policy (Housing) 2021

Development for the purposes of a secondary dwelling or an ancillary structure on a lot must result in a new building or a new part of an existing building having a setback from a primary road, other than a classified road, of at least—

the average distance of the setbacks of the 2 nearest dwelling houses on the same side of the primary road and located within 40m of the lot on which the principal dwelling is erected, or

if 2 dwelling houses are not located within 40m of the lot on the same side of the primary road—

for a lot with an area of at least 450m² but not more than 900m²—4.5m, or

for a lot with an area of more than 900m² but not more than 1,500m²—6.5m, or

for a lot with an area of more than 1,500m²—10m.

Development for the purposes of a secondary dwelling or an ancillary structure on a lot must result in a new building or a new part of an existing building having a setback from a boundary of the lot with a parallel road that is not a classified road of at least 3m.

Development for the purposes of a secondary dwelling or an ancillary structure on a corner lot must result in a new building or a new part of an existing building on the lot having a setback from the boundary with a secondary road that is not a classified road of at least—

for a lot with an area of at least 450m² but not more than 600m²—2m, or

for a lot with an area of more than 600m² but not more than 1,500m²—3m, or

for a lot with an area of more than 1,500m²—5m.

For the purposes of this section, if a lot is a corner lot—

a boundary that is at least 6m in length is taken to be a boundary with a primary road, and

the other boundaries are taken to be boundaries with a secondary road.

For the purposes of this section, if a lot has contiguous boundaries with a road or roads but is not a corner lot, the lot is taken to have a boundary only with a primary road.