State Environmental Planning Policy (Housing) 2021

Development for the purposes of a secondary dwelling or an ancillary structure may only be carried out on a lot that—

at the completion of the development will have only 1 principal dwelling and 1 secondary dwelling, and

for a lot other than a battle-axe lot—has a boundary with a primary road, measured at the building line, of at least the following—

if the lot has an area of at least 450m² but not more than 900m²—12m,

if the lot has an area of more than 900m² but not more than 1500m²—15m,

if the lot has an area of more than 1500m²—18m, and

for a battle-axe lot—has an access laneway of at least 3m in width and measuring at least 12m by 12m, excluding the access laneway.

A lot on which a new secondary dwelling is erected must have lawful access to a public road.

Nothing in this Schedule requires the provision of additional parking spaces for development for the purposes of a secondary dwelling.