Dual Occupancy

Dual occupancy means two dwellings on a single lot. They can be attached (a duplex sharing a common wall) or detached (two separate houses on the one title). It sits between a straight cosmetic flip and a full subdivision as a value-add strategy: you double the dwellings, and potentially the income, without necessarily creating two separate titles.

Whether a lot can carry a dual occupancy is set by the local planning controls — in NSW, the Local Environmental Plan and its lot-size and frontage minimums, with equivalents in other states. Recent NSW low- and mid-rise housing reforms have widened where dual occupancies are permitted, but the specifics still turn on the zone, the lot dimensions and any overlays, so it always comes back to checking the individual block. A site that is a metre short on frontage or under the minimum lot size simply will not qualify.

Dual occupancy vs the alternatives

It is easy to confuse dual occupancy with a granny flat and with subdivision, and the differences drive the numbers. A granny flat (secondary dwelling) is subordinate to the main house and capped in size; a dual occupancy is two genuine dwellings of comparable standing. Subdivision splits the land into separate titles; a dual occupancy on one title does not, unless you also pursue a strata or Torrens subdivision afterward to sell the two dwellings separately.

The right move depends on lot size, zoning, your capital and what comparable sales support on exit. Rather than assume, test the options side by side: the feasibility tool models a dual occupancy against a straight flip and a split on the same address, and granny flat vs subdivision compares the two most common small-scale plays. General information only, not planning advice.