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The Livable Housing Design Standard and factory-built homes

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

The Livable Housing Design Standard sets minimum accessibility requirements in the National Construction Code for houses (Class 1a) and apartments (Class 2 sole-occupancy units), based on the silver standards of the Livable Housing Design Guidelines and introduced in NCC 2022.^[1] Each state and territory decides whether and how the provisions apply: they do not apply in New South Wales, and Western Australia's government has stated that it intends to disallow them.^[1][2][3] NCC 2025 made no changes to them.^[4]

Most people planning a modular or prefabricated home have heard about the 7-star energy rule. Far fewer have heard about the second mandatory change that arrived in the same edition of the National Construction Code, and which has a much larger effect on the shape of the rooms: the Livable Housing Design Standard.

It sets minimum accessibility requirements for ordinary new houses — not disability-specific housing, ordinary houses. And for a factory-built home it has an awkward property: almost every requirement is a dimension, dimensions are fixed when the module is framed, and a module that was framed to the wrong standard cannot be widened on site.

What the standard is §

At the direction of Ministers, the Australian Building Codes Board developed minimum accessibility requirements for Class 1a buildings — houses — and Class 2 sole-occupancy units, which are apartments. The stated objective is housing designed to meet the needs of the community, including older Australians and people with disability.^[1]

The requirements arrived in NCC 2022, as changes to the technical provisions in both volumes of the code plus a new referenced technical standard, the ABCB Standard for Livable Housing Design. The provisions are based on the silver standards of the Livable Housing Design Guidelines.^[1]

The ABCB's own handbook for NCC 2025 states that there are no changes to the livable housing provisions in that edition.^[4] The substance has been stable since 2022; what has moved is which jurisdictions apply it, and when.

Why it differs by state §

This is the part that catches people out. The ABCB writes the code; it does not enact it. Each state and territory can determine whether and how the new provisions will be applied in their jurisdiction, and the board's advice is to contact your state or territory building jurisdiction for clarification.^[1]

The practical consequence is that a design compliant in one state may not be compliant in another, and a design compliant this year may not have been last year in the same state. For a manufacturer selling a standard floor plan into several markets, that is a real problem — and it is worth asking a builder directly which jurisdictions their standard plans are certified for, rather than assuming a national product is nationally compliant.

Where it applies §

Whether the provisions apply depends on the state or territory. The Australian Building Codes Board's NCC 2022 adoption table, stated to be correct as at 22 September 2023, lists them as commencing on 1 October 2023 in the Northern Territory, 1 May 2024 in Victoria and 1 October 2024 in South Australia and Tasmania, with Queensland and the ACT applying them through their own implementation arrangements.^[5] New South Wales does not apply them: the NSW variation to Part H8 states that livable housing design requirements do not apply to Class 1a buildings in NSW.^[2] Western Australia's government has stated that it intends to disallow the provisions, which requires amendments to the Building Regulations 2012.^[3] In the Northern Territory, the government states that building permit applications for new homes from 1 October 2023 must meet the requirements.^[6]

The ABCB table pre-dates later state decisions and should be read with the current position in each jurisdiction; for anything other than the jurisdictions above, confirm with the state or territory building authority.

Tasmania — a worked example of phasing §

Tasmania applies Part H8 of the NCC through a Director's Determination that phases the provisions in over three stages, deliberately, to give building service providers time to adjust.^[7]

Tasmania also preserves a transitional escape. Section 11(5) of the Building Act 2016 permits an exemption from certain NCC provisions where the certificate of likely compliance was issued before the relevant provision was adopted by the state, or where the building surveyor or permit authority certifies in writing that substantial progress had been made in the design of the work before the provision was adopted.^[7]

That second limb is the one worth understanding if you are buying off-site. Design progress, not construction progress, is what the exemption turns on — and a factory-built home is a design-heavy, construction-late product. The determination of whether it applies rests with your building surveyor, and CBOS recommends discussing these issues with the surveyor you have engaged.^[7]

Why this bites harder on a factory-built home §

Read the Tasmanian list again as a list of physical dimensions rather than a list of rules. Entry door clear opening width. Internal door and corridor widths. Circulation space inside the sanitary compartment. A shower with no hob. Wall reinforcement behind the lining in bathrooms.^[7]

Every one of those is set at framing. In conventional construction, discovering a corridor is too narrow at lock-up stage is expensive and disruptive but physically possible to fix. In volumetric modular construction, the corridor width is the module width minus the wall build-up, the walls are lined and finished in the factory, and the module has already been engineered, craned and transported as a rigid box. There is no cheap version of that correction.

Two specific consequences are worth planning around.

Wall reinforcement is invisible and permanent. Reinforcing behind bathroom linings for future grab rails is trivial to install before the sheeting goes on and effectively impossible to verify afterwards without opening the wall. If you are buying a home built in a factory you will never visit, this is a documentation question: ask for it to appear on the drawings and in the handover pack, alongside the other items in our warranties, defects and maintenance coverage.

Wider circulation makes the box bigger. Corridors and doorways sized for accessibility push floor area outward, and module width is constrained by what can be transported on a road. A design that gains width to satisfy circulation requirements may cross a threshold that changes the transport permit, the escort requirement or the route — costs covered in delivery, transport and craneage.

There is also a site interaction that has nothing to do with the factory. Livable housing is built around step-free access, and modular homes are frequently installed on piers or a raised subfloor to deal with slope, drainage or flood levels. Reconciling a step-free entry path with a raised floor level is a site design problem — ramps, regrading, or a different foundation approach — and it belongs in the early conversation, not the handover. See site works and site classification.

The timing trap §

Which edition of the code applies to your build is generally fixed by when the building approval is issued, not when you signed the contract. Off-site construction stretches the gap between those two dates: a deposit paid, a factory slot booked, a design finalised, and then an approval issued months later under a version of the code that has since moved on.

Where a jurisdiction is phasing provisions in — as Tasmania is, with a further stage commencing 1 October 2026^[7] — a contract signed before a stage commences and approved after it may be assessed against the later requirements. The question to put to a builder in writing is simple: which edition and which stage of the livable housing provisions is this design documented to, and who carries the cost if the applicable requirements change before approval is issued?

Our related coverage of the energy side of the same code is at the 7-star NatHERS rule, and the accessibility standards that apply to specialist disability housing — a separate and much more demanding regime — at NDIS Specialist Disability Accommodation and modular construction.

What is not covered here §

This page does not state the numerical requirements — door widths, corridor widths, circulation dimensions or ramp gradients. Those sit in the ABCB Standard for Livable Housing Design and Part H8 of NCC Volume Two, and reproducing figures here would risk publishing values that do not match the edition adopted in your jurisdiction.

It does not set out detailed phasing or transitional arrangements outside Tasmania, or the current detail of the Queensland and ACT implementation arrangements, which the ABCB table refers to separately. The ABCB is explicit that adoption is a matter for each jurisdiction.^[1] Contact the relevant state or territory building authority.

It does not cover exemptions and concessions available for particular building types, lot conditions or alterations and additions, which differ between jurisdictions. It does not cover Class 2 apartment buildings beyond noting that the standard reaches them.^[1] And it is not a compliance document: the ABCB describes its own handbook as guidance in generic terms rather than specific compliance advice.^[4] Your building surveyor or certifier determines compliance for your project.

References §