What is the minimum block size for a dual occupancy?-
There is no general minimum block size for a dual occupancy in RZ1 or RZ2 under the current ACT Missing Middle Housing rules.
Instead of relying on a minimum block size, whether two dwellings can be developed on a particular block depends on whether the proposal can meet the applicable planning and design requirements, such as site coverage, building height, setbacks, private open space, planting, parking and access.
This means a smaller block may potentially accommodate a dual occupancy if an appropriate compliant design can be achieved.
Reference: Planning (Missing Middle Housing) Design Guide 2026 – ACT Missing Middle Housing Design
Short Answer
There is no general minimum block size for a dual occupancy in RZ1 or RZ2 under the current ACT planning rules. Whether a block can accommodate two dwellings depends on the proposed design meeting the applicable planning requirements.
Detailed Explanation
Under the current Territory Plan, there is no general prescribed minimum block area for dual occupancy development in RZ1 or RZ2. The former RZ1 requirement for a minimum 800 m² block area for more than one dwelling has been removed through the Missing Middle Housing Reform. The permissibility and development capacity of a site are instead determined by compliance with the applicable Residential Zones Policy outcomes and associated development controls. Accordingly, the ability to establish a dual occupancy depends on the characteristics of the particular site and whether the proposed development satisfies the applicable planning requirements.No minimum block size does not remove the need for planning assessment.
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