What extra steps apply when building a duplex or dual occupancy?

A duplex usually needs a planning approval that allows two dwellings on the lot, and the design must meet extra building requirements such as fire and sound separation between the homes. Each dwelling may need its own services and meters. If you plan to sell or own the homes separately, you will also need a subdivision (for example Torrens or strata title), which adds survey, legal and council steps. Check whether your lot is zoned and sized for a duplex before you design.

General information only. Requirements vary by state or territory and change over time, so check the current rules for your location.