Questions & Answers

How much of my block can I build on?

How much of your block you can build on depends on the block type, residential zone and type of development.

For a single dwelling or a dwelling with a secondary residence (granny flat), the maximum site coverage is generally 40% for a large block, 60% for a mid-sized block and 70% for a compact block. The main house, secondary residence and relevant roofed structures are considered together when calculating site coverage.

For a dual occupancy, which is treated as multi-unit housing for these requirements, the maximum site coverage is generally 45% in RZ1 and RZ2 and 50% in RZ3, RZ4 and RZ5.

Other planning requirements, such as setbacks, private open space, planting and building height, may further limit how much of the block can actually be developed.

Reference: Territory Plan 2023 (NI2023-540), Residential Zones Policy, Assessment Requirements 7 and 8 (Site Coverage) – Territory Plan 2023 | Notifiable instruments

Last reviewed: 1 September 2026 Information current as at: 1 September 2026

Short Answer

The amount you can build on depends on your block and development type:

  • Single dwelling / secondary residence: generally 40%–70%, depending on the block type.
  • Dual occupancy: generally 45% in RZ1/RZ2 and 50% in RZ3–RZ5.
Other planning controls may further restrict the buildable area.

Detailed Explanation

Under the ACT Territory Plan Residential Zones Policy, maximum site coverage is determined by the applicable development type, block category and residential zone. For single dwelling housing, including secondary residences and associated roofed Class 10 buildings, the maximum site coverage is 40% for large blocks, 60% for mid-sized blocks and 70% for compact blocks, subject to the applicable assessment requirements. For multi-unit housing, including dual occupancy, maximum site coverage is generally 45% of the original block area in RZ1 and RZ2 and 50% in RZ3, RZ4 and RZ5. Compliance with maximum site coverage does not by itself establish that the entire permitted area can be developed. The proposal must also comply with other applicable Territory Plan assessment requirements.
Key Point

No minimum block size does not remove the need for planning assessment.

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