Granny Flats rules in Canberra

Building a granny flat 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.

Approval required

Allowed, but usually needs approval

Yes. A secondary residence of between 40 m² and 90 m² is allowed under the Territory Plan. It normally needs development approval, can be rented on the open market, but cannot be separately titled.

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

Approval pathway: A secondary residence normally requires development approval under the Territory Plan. It stays on the same lease as the main house and cannot be separately titled unless you pursue a dual occupancy (generally on a block of at least 800 m²).

Key rules at a glance

Maximum floor area	90 m² (minimum 40 m²)
Separate title	Not permitted (dual occupancy required)
Approval type	Development approval typically required
Can it be rented?	Yes - on the open market
Occupancy restriction	Removed - need not be related
Zones	Residential zones (RZ1 to RZ5)

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 →

Granny flats 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 granny flat in Canberra?

Usually yes. In Australian Capital Territory, a granny flat 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 granny flat 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.

How big can a secondary residence be in the ACT?

Between 40 m² and 90 m² of gross floor area under the Territory Plan.

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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