Dual occupancy rules in Canberra

Building a dual occupancy in Canberra? ACT Government (Territory Plan) applies the Australian Capital Territory planning framework. Here's what that means locally — plus the overlays worth checking on your specific block.

Depends on your lot

Now allowed in RZ1 and RZ2 after the 2026 Missing Middle reforms

Yes in most suburban areas, following a major change. The Missing Middle Housing reforms commenced on 1 July 2026 and allow duplexes, triplexes, terraces and townhouses of up to two storeys in RZ1 and up to three storeys in RZ2, removing the previous 800 m² minimum block size for a second dwelling in RZ1.

Canberra: assessed by ACT Government (Territory Plan) under the Australian Capital Territory rules below.

Approval pathway: A development application to the ACT Planning Authority is required, assessed in the merit track against the Territory Plan 2023, the residential zones development code and the Missing Middle Housing Design Guide. Because ACT land is leasehold, adding dwellings or unit titling normally also requires a lease variation - and a 50 percent reduction in the codified lease variation charge applies to eligible missing middle developments until June 2029.

Key rules at a glance

Minimum block size	The former 800 m² minimum for a second dwelling in RZ1 was removed on 1 July 2026. What now limits capacity is site coverage, setbacks, canopy cover and design outcomes (indicative - confirm the current Territory Plan rules for your block).
Zones permitted	RZ1 Suburban and RZ2 Suburban Core, plus the higher density residential zones. RZ1 is capped at two storeys; RZ2 allows up to three.
Second dwelling size	No size cap. Under the Territory Plan 2023 a second dwelling in RZ1 had to be 120 m² or less (excluding the garage) to be unit titled; that cap was removed by the Missing Middle reforms on 1 July 2026. Site coverage, setbacks, canopy cover and design outcomes now govern
Approval pathway	Merit track development application to the ACT Planning Authority, usually accompanied by a lease variation.
Can it be subdivided or unit titled?	Yes. Unit titling and block subdivision are permitted in both RZ1 and RZ2, so two dwellings can be separately titled and sold. Since 1 July 2026 unit titling is available on blocks above 600 m² (previously 800 m²)
Typical timeframe	Commonly 3-6 months for a merit track development application, longer where a lease variation is involved.

Overlays can change your eligibility

Heritage, flood and bushfire controls on your specific lot can remove the fast-track and require a full application — even when the general rules say you're fine.

HeritageFloodBushfire

Check your address for overlays →

Dual occupancys in Canberra

ACT Government (Territory Plan) is the authority for Canberra in Australian Capital Territory. The statewide Australian Capital Territory rules above set the baseline; the council can apply extra local controls, and heritage, flood or bushfire overlays on your lot can change what's allowed.

Visit ACT Government (Territory Plan) ↗ Full Australian Capital Territory rules →

Frequently asked questions

Do I need council approval for a dual occupancy in Canberra?

Usually yes. In Australian Capital Territory, a dual occupancy generally needs an application, and ACT Government (Territory Plan) is the authority that assesses it. See the full state rules for the pathway and what's required.

Which council approves a dual occupancy in Canberra?

ACT Government (Territory Plan) is the consent authority for Canberra (Australian Capital Territory). You can review local planning controls on the council website and lodge through your state planning portal.

Can I build a duplex on an RZ1 block in Canberra?

Yes, since 1 July 2026. The Missing Middle Housing reforms allow duplexes, triplexes, terraces and townhouses of up to two storeys in RZ1, and the previous 800 m² minimum block size for a second dwelling has been removed. You still need a merit track development application, and site coverage, setbacks and canopy cover requirements decide how much actually fits.

Sources

Last reviewed: July 2026. Rules can change — verify with your council before starting work.

Related building rules

General guidance only — not professional planning advice. Local requirements in Canberra can differ from the statewide summary and change over time; always confirm with ACT Government (Territory Plan) before starting work. Last reviewed: July 2026.

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