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Modular home rules and approvals in the Australian Capital Territory

From Modular Living Australia — the independent knowledge base Last updated: 8 Oct 2026

In the ACT a modular home goes through the same two stages as any new house: development approval under the Planning Act 2023 and the Territory Plan, then building approval from a registered building certifier, which cannot be issued before development approval.^[1][2] New houses that meet set requirements can be exempt from needing a development application.^[3]

The Australian Capital Territory is the simplest jurisdiction in Australia to describe and one of the least written about. There are no councils. One territory-wide authority handles planning, and one Territory Plan sets the rules for every block. For someone comparing a factory-built home across states, that removes an entire layer of uncertainty.

What it does not remove is the two-stage structure. In the ACT you deal with development approval first and building approval second, and the second cannot be issued without the first^[2].

The framework §

Planning in the ACT runs on the Planning Act 2023 and the Territory Plan. The Territory Plan is the main policy document — it sets out how land can be used and what can be built where, and it is the tool used when a development application is assessed and decided^[1].

Sitting alongside it is the Planning (Exempt Development) Regulation 2023, which lists the developments that do not need a development application at all^[1]. These are generally low-impact works.

None of this is written around construction method. The Territory Plan is concerned with what the finished building is, where it sits on the block, and how it looks and performs — not with whether the walls were assembled in a factory in Hume or on the block itself. A modular Class 1a dwelling is assessed as a dwelling.

Stage one: development approval §

A development application is lodged online through eDevelopment. New houses, along with some smaller projects, can be exempt from needing a DA provided they meet certain requirements^[3]. Whether a particular modular house is exempt depends on the block, the zone and whether the design meets the Territory Plan's residential codes, which set the design and siting requirements for residences^[3].

Where a DA is required, it is assessed in a track. ACT Planning publishes statutory assessment timeframes for each: the code track is assessed within 20 working days of lodgement; the merit and impact tracks within 30 working days if no representations are received, and 45 working days where representations are received. An application is considered lodged once the relevant fees are paid^[3].

Timeframes are as published by ACT Planning and should be confirmed as current before you plan around them. They are statutory assessment periods, not the total elapsed time from application to approval.

The Territory Plan also states that further assessment is not required where a proposed development complies with the relevant provisions in the design guides and planning technical specifications and comprehensively addresses its outcomes^[1]. For a manufacturer offering standard designs, that is the provision worth understanding: a design that sits cleanly inside the codes is a materially different proposition from one that needs to argue its case on merit.

Stage two: building approval §

Building approval is the technical stage. You must have a building approval in place to confirm that the proposed building work complies with the relevant building laws and with the National Construction Code^[2].

The mechanics are straightforward but easy to get out of order:

1. Development approval is obtained first, where one is needed^[2].
2. A building certifier is appointed. The Appointment of Certifier and Application for Building Approval form, together with the Appointment of Builder and Application for Commencement Notice form, are lodged with Access Canberra^[2].
3. The certifier is given detailed plans that meet the relevant codes and design guidelines^[2].
4. The application for building approval must include an estimate of the cost of work^[2].

For off-site construction the practical question is timing rather than substance. The certifier's approval attaches to plans, and the plans have to be complete and approved before work starts — which for a modular build means before the manufacturer begins fabrication, not before the modules arrive on the block. Manufacturers who quote a short on-site programme are describing the installation, not the approval sequence that has to precede it.

What the ACT does not have §

Two absences are worth stating plainly, because readers arriving from New South Wales or Victoria tend to assume otherwise.

There is no council layer. In most of Australia the practical variable is which local government area you are in, and the same design can be treated differently across a boundary. The ACT has a single consent authority, which means a manufacturer's standard design either works territory-wide or does not.

There is also no ACT equivalent of the New South Wales prefabricated buildings framework. New South Wales legislated a definition of "prefabricated building" and an approvals pathway built around it in 2026. Nothing comparable was identified in the ACT material compiled here. A modular home in the ACT is approved through the ordinary dwelling pathway.

Government interest in the method §

The ACT Government has been reported as considering modular homes and prefabricated materials for public housing, in the context of a target of enabling 30,000 new homes by 2030. Industry participants quoted in the same reporting said changes to planning, regulation and finance rules would be needed to reduce costs and scale up local production^[4].

That is a procurement and policy signal, not a change to the rules that apply to a private buyer. Nothing in it alters the approval pathway described above.

What is not covered here §

• Whether your specific house is exempt from a DA. Exemptions depend on the block, zone and design. The Planning (Exempt Development) Regulation 2023 is the operative instrument^[1] and the Territory Planning Authority is the body that confirms it.
• Current fees and timeframes. Both change. Figures above are attributed to their source and dated.
• Leasehold. ACT land is held under leasehold, and lease variation charges can apply where a lease is varied^[1]. That is outside the scope of this page and is a matter for a conveyancer.
• Granny flats, tiny homes and transportable homes in the ACT. Each is covered in its own guide on this site. This page deals with a permanent modular dwelling.
• Energy and utility conditions. Restrictions on connecting new developments to the gas network operate under separate ACT regulation and are not detailed here.
• Builder licensing. Requirements for who may carry out residential building work in the ACT are not set out on this page.

References §