Yes, you can sell a newly created block without constructing a dwelling on it in the ACT, but there are conditions.

Under the ACT planning rules, a block subdivision allows a residential block (RZ1–RZ5) to be subdivided without first building the new dwelling/s. This means you can create a new vacant residential block and sell it. However, the subdivision approval must show that a compliant dwelling could be built on each new block.

If the newly created block remains undeveloped, the new Crown lease will include development covenants requiring the construction of a dwelling within a specified timeframe. In addition, Minister’s consent may be required before transferring (selling) the Crown lease if the dwelling has not been constructed.

Reference:

ACT Government – Advisory Note 19: Block Subdivision versus Unit Title Subdivision in Residential Zones – Block Subdivision vs Unit Title Subdivision (Residential Zones)

There are two subdivision options to consider if you already have a house on your block and want to create separate ownership. However, the option that applies depends on whether you want to create a new block of land or separate units within the existing block.

Option 1 – Block subdivision (applicable if you want to create and sell a vacant block)

A block subdivision may be possible if your existing block can be divided into two separate blocks that meet the Territory Plan requirements. The Development Application must show that each new block can support a compliant dwelling. If approved, the new vacant block can receive its own Crown lease and may be sold separately. However, if the new block is undeveloped, the new Crown lease may include requirements to build a dwelling, and approval from the Minister may be needed before transferring the block if the dwelling has not been constructed.

Option 2 – Unit title subdivision (generally not applicable if you only want to sell a vacant block)

Unit title subdivision does not create a new block of land. Instead, it creates separate ownership of dwellings within the same block. This option is generally used where there are multiple dwellings (such as a dual occupancy) that have been lawfully constructed and are intended to be sold as separate units. It would not allow you to sell an empty piece of land separately.

For your situation (one existing house and the goal of selling a new vacant lot), block subdivision is the relevant pathway to investigate. The ability to proceed will depend on the block’s zoning, minimum block size, access, servicing, lease conditions, and other Territory Plan requirements.

Reference: 

Yes, 

The 2026 Technical Specifications changed how front setbacks are applied by removing separate lower and upper floor setback requirements and introducing a single dwelling setback requirement. The exact change depends on the applicable table, subdivision approval date, and type of frontage.

• Table 1 (corner blocks – secondary street frontage): Under the 2025 specifications, a large block required a 4 m setback for the lower floor and 6 m for the upper floor to the secondary street frontage. The 2026 specifications remove this distinction and require a single 4 m setback for the dwelling, regardless of storeys. The 6 m garage or carport setback remains unchanged.
• Table 2 (subdivisions approved on or after 18 October 1993 but before 31 March 2008): Under the 2025 specifications, a large block required 4 m for the lower floor and 6 m for the upper floor for both the primary front boundary and secondary street frontage. The 2026 specifications replace this with a single dwelling setback of 4 m for both the primary front boundary and secondary street frontage. Garage and carport setbacks remain unchanged at 5.5 m.
• Table 3 (subdivisions approved on or after 31 March 2008): Under the 2025 specifications, a large block required 4 m for the lower floor and 6 m for the upper floor to the primary front boundary. The secondary street frontage setback remained 3 m, and the public open space or pedestrian path setback remained 4 m. Under the 2026 specifications, these are replaced with a single dwelling setback of 4 m to the primary front boundary, 3 m to the secondary street frontage, and 4 m to public open space or pedestrian paths wider than 6 m, regardless of storeys. Garage and carport setbacks remain unchanged.

• Table 4 (Multi-unit housing front boundary setbacks): Under the 2025 Technical Specifications, front setback requirements were separated into lower floor and upper floor levels. For subdivisions approved on or after 18 October 1993, the primary front boundary setback was 4 m for lower floors and 6 m for upper floors, with garages and carports set back 5.5 m (including at least 1.5 m behind the front building line). Older subdivisions required a 6 m setback. Secondary street frontage and pedestrian path/public open space setbacks also varied depending on the frontage type and block size.

  Under the 2026 Technical Specifications, these requirements are simplified by removing the lower and upper floor distinction. A single dwelling setback now applies:

• Primary front boundary: 4 m for subdivisions approved on or after 18 October 1993, and 6 m for earlier subdivisions.
• Secondary street frontage: 2 m for corner blocks.
• Pedestrian paths up to 6 m wide: 3 m.
• Public open space or pedestrian paths wider than 6 m: 4 m.
• Garage and carport setbacks remain unchanged, including the 5.5 m setback for newer subdivisions and the applicable setbacks for other frontage types.

The updated requirements should be checked against the relevant front boundary setback table in the Planning (Residential Zones) Technical Specifications 2026, as the applicable requirement depends on the block circumstances.

Reference: Planning (Residential Zones) Technical Specifications 2026 (NI2026-303), Assessment Outcome 14.5- Planning (Residential Zones) Technical Specifications 2026

Where required front setbacks are not specified in the relevant district technical specification, the secondary street frontage may be nominated by the applicant, but the nomination must consider the front setback of existing buildings. On a block with existing buildings, the existing building setback is used to determine the primary and secondary frontages.

• – For Single Dwelling, blocks in subdivisions approved originally before 18 October 1993, the secondary street frontage setback is a minimum of 4m for Large blocks and 3m for Mid-sized and Compact Blocks.

• – For Single Dwelling, blocks in subdivisions approved on or after 18 October 1993 but before 31 March 2008, the secondary street frontage setback is a minimum of 4m for Large blocks and 3m for Mid-sized and Compact Blocks.

• – For Single Dwelling, blocks in subdivisions approved on or after 31 March 2008, the secondary street frontage setback is a minimum of 3m for Large and Mid-Sized blocks and 2m for Compact Blocks.

• – For Multi-Unit Housing, all residential zones, the secondary street frontage setback is a minimum of 2m for Large and Mid-Sized blocks.

Reference: Planning (Residential Zones) Technical Specifications 2026 (NI2026-303), Assessment Outcome 14.3- Planning (Residential Zones) Technical Specifications 2026

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

Potentially, yes. Dual occupancy may be permitted on land in ACT residential zones where multi-unit housing is permitted, including RZ1 Suburban, RZ2 Suburban Core, RZ3 Urban Residential, RZ4 Medium Density Residential and RZ5 High Density Residential.

Whether you can actually build a dual occupancy on your block will depend on its zoning, Crown lease, site constraints and proposed design. The development must meet the applicable requirements for matters such as site coverage, setbacks, building height, private open space, planting, parking and access.

Reference: Territory Plan 2023 – Part E01 Residential Zone Policy –  Territory Plan 2023 | Notifiable instruments

A secondary residence (granny flat) cannot be sold separately because it is a smaller dwelling that is subordinate to the main dwelling and remains on the same title.

A dual occupancy may be sold separately if the dwellings are separately titled, such as through an approved unit-title subdivision. Simply building a dual occupancy does not automatically mean the dwellings can be sold separately.

Reference:

Territory Plan 2023 – Part E01 Residential Zone Policy, F01 Subdivision Policy –  Territory Plan 2023 | Notifiable instruments

Unit Titles Act 2001(ACT) (A2001-16) (registration and creation of unit titles) – Unit Titles Act 2001

An unusual block shape does not automatically prevent development. What matters is whether a compliant and functional development can be designed within the actual boundaries of the block.

For example, a triangular block may become very narrow toward the rear. Once the required side and rear setbacks are applied, there may be less usable space for a building than on a rectangular block of the same overall area.

The design may therefore need to be adjusted to suit the site's shape.

Reference: Planning (Residential Zones) Technical Specifications 2026 (NI2026-303) – Planning (Residential Zones) Technical Specifications 2026 | PDF

No. For a single dwelling on a large block, Table 5 is unchanged: a lower-floor external wall is 1.5 m from the side boundary within the primary building zone and rear zone, and 3 m from the rear boundary; an upper-floor external wall is 3 m within the primary building zone and 6 m within the rear zone and to the rear boundary; an upper-floor unscreened element is 6 m in all positions; and a garage or carport may be at 0 m to one side boundary only and 3 m from the rear boundary.

Reference: NI2026-303, spec 14.4 and Table 5.

Yes. A dual occupancy can be designed on a battle-axe block, subject to meeting the applicable planning requirements.

The ACT Missing Middle Housing Design Guide specifically provides an example of a dual occupancy on a battle-axe block. In the example, the block also fronts public open space, and the dwellings are positioned to provide front gardens and direct access to the public open space, supporting activation and passive surveillance

Whether a particular battle-axe block can accommodate a dual occupancy will still depend on the site's circumstances and compliance with the applicable Territory Plan requirements.

Reference: ACT Missing Middle Housing Design Guide – Site and Land Use → Irregular Blocks – https://www.planning.act.gov.au/__data/assets/pdf_file/0020/3092411/ACT-Missing-Middle-Housing-Design-Guide.pdf

A corner block can give you more ways to arrange a development because there are two street frontages to work with.

For example, it may be possible to orient the dwellings toward different streets or consider different locations for entrances and driveways. This can be useful when designing a dual occupancy.

However, both street frontages need to be considered in the design. Setbacks, driveway locations, pedestrian access and the way the development presents to each street can reduce some of that flexibility.

The actual development potential therefore depends on the block dimensions, zoning, street layout and applicable planning requirements, not simply on the property being a corner block.

Reference: Planning (Residential Zones) Technical Specifications 2026 (NI2026-303) – Planning (Residential Zones) Technical Specifications 2026

There is no general rule saying that a block must be rectangular. However, its shape can influence where and how much you can build.

For example, on a triangular or irregular block, the side boundaries may converge toward the rear. Once the required setbacks are applied, the resulting buildable area may become narrower, which can affect the size, position and layout of the proposed dwelling.

Similarly, a narrow block may make it more difficult to accommodate a driveway, parking, planting and private open space while still meeting the required building setbacks.

The important point is that block shape itself is not necessarily a restriction; it is how that shape interacts with the applicable planning controls that determines the development potential.

Reference: Planning (Residential Zones) Technical Specifications 2026 (NI2026-30) – Planning (Residential Zones) Technical Specifications 2026 | PDF