How many homes could actually fit on my block?
Two blocks of the same size can support very different numbers of homes.
What can actually fit depends on how much usable development space remains after considering matters such as:
- Setbacks and building envelope — how much of the block can physically be built on.
- Site coverage — the maximum proportion that buildings can cover.
- Parking and vehicle access — enough space must still be available to appropriately service the dwellings.
- Private and communal open space — where applicable.
- Planting, deep soil and tree canopy — which reserve parts of the site for landscaping and trees.
- Easements, utilities, slope and existing buildings — which can further reduce or reshape the usable area.
The 2026 Missing Middle reforms now allow a wider range of housing in RZ1 and RZ2, including duplexes, triplexes, terraces, townhouses and low-rise apartments, but that does not mean every block can physically accommodate each of those options.
The initial tool can show the likely development envelope and opportunities, while a Full Block Report can test the site in more detail and estimate the realistic number of dwellings that could be accommodated.
Reference: Planning (Missing Middle Housing) Design Guide 2026 (NI2026-312) – https://www.planning.act.gov.au/__data/assets/pdf_file/0020/3092411/ACT-Missing-Middle-Housing-Design-Guide.pdf
Short Answer
There is no single answer based on block size alone. Under the current Missing Middle framework, there is no general minimum block size for dual occupancy, and the practical number of dwellings that can fit is determined by the block’s zone, applicable density provisions and the usable development envelope.
That means the realistic dwelling yield comes from testing the planning controls against the actual block, rather than simply dividing the site area by a standard lot size.
Detailed Explanation
The current Territory Plan framework does not determine residential yield simply by applying a universal minimum site area per dwelling. The Missing Middle reforms, effective 1 July 2026, expanded multi-unit housing opportunities in RZ1 and RZ2 and removed several previous barriers to additional housing.
The achievable dwelling yield still needs to be tested against the applicable Residential Zones Policy, Planning (Residential Zones) Technical Specifications 2026 (NI2026-303) and, where triggered, the Missing Middle Housing Design Guide. The Design Guide applies to residential proposals of three storeys or less providing more than one dwelling.
No minimum block size does not remove the need for planning assessment.
Would you like to know what these rules mean for your property?
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