Can one dwelling in a dual occupancy be substantially larger than the other?
Yes, potentially. The dwellings do not have to be the same size. For the relevant RZ1 unit-titled dual occupancy provisions, one dwelling is limited to 120 m², while the other may be larger, subject to the other applicable planning requirements.
Yes, potentially. The two dwellings in a dual occupancy do not necessarily have to be the same size.
For an RZ1 dual occupancy on a standard block proposed for unit titling, the Subdivision Policy requires one dwelling to have a maximum dwelling size of 120 m². This requirement applies to one dwelling only, so the other dwelling may be larger, subject to all other applicable planning requirements. ACT Planning likewise explains the rule as requiring “one dwelling” to be no more than 120 m².
Reference: ACT Territory Plan, F01 Subdivision Policy – Territory Plan 2023 | Notifiable instruments
Link on the answer: https://www.legislation.act.gov.au/ni/2023-540/Current
Where this question is kept
| Dual Occupancy Q&A | #437 | agrees | 17/08/2026 |