AS 1428 Design for access and mobility: builder's guide

TL;DR

AS 1428 is Australia’s suite of standards for designing access and mobility into buildings for people with a disability. For residential builders of standard Class 1a houses, the main compliance trigger is NCC 2022 Part H8 Livable Housing Design (not AS 1428.1 directly): this mandates a Silver-level accessible design for all new Class 1a homes in most states, including step-free entry, 820 mm clear door openings, 1000 mm corridor widths, and a hobless shower. It adds roughly 1 to 2 per cent to total build cost per ABCB analysis (verified 2026-05-08: Queensland Department of Housing). NSW and WA are not adopting Part H8 for Class 1a. For Class 1b (holiday accommodation, B&Bs), Class 2 apartments, and Class 3-9 commercial/public buildings, AS 1428.1:2021 applies directly via NCC 2022 Part D4. The Premises Standards under the Disability Discrimination Act 1992 also reference AS 1428.1:2021 from 29 July 2025.

In plain English

The AS 1428 series is a set of Australian Standards that specify how to design buildings so people with disability can use them safely and independently. The series covers physical access paths, doorways, turning spaces, ramps, stairs, sanitary facilities, tactile indicators, wayfinding signage, and assistive listening systems.

For residential builders, the series intersects with your work in two main ways:

Class 1a houses in most states: NCC 2022 Part H8 Livable Housing Design requires the new Silver-level accessible design features for every new house. The DTS path calls up the ABCB Standard for Livable Housing Design (not AS 1428.1 directly, though the Silver standard overlaps with AS 1428 principles).
Class 1b, 2 and higher: the NCC 2022 Volume One Part D4 directly references AS 1428.1:2021 for any building that is not a standard private dwelling. This covers boarding houses, holiday accommodation, apartment common areas, and commercial premises.

The Disability Discrimination Act 1992 (Cth) is the federal law underpinning access requirements. The Disability (Access to Premises-Buildings) Standards 2010 (Premises Standards) is the technical instrument under the DDA that specifies access requirements for public buildings, and it references AS 1428.1 for technical compliance (verified 2026-05-08: ABCB, amended Premises Standards and the NCC).

What it requires

The AS 1428 series: which part does what

Part	Designation	Current edition	Scope
Part 1	AS 1428.1	2021	General requirements for access in new building work: paths, doors, sanitary facilities, ramps
Part 2	AS 1428.2	1992 (reconfirmed 2015)	Enhanced and additional requirements: higher access standards beyond Part 1
Part 3	AS 1428.3	1992	Requirements for children and adolescents with physical disabilities
Part 4.1	AS/NZS 1428.4.1	2009	Tactile ground surface indicators (TGSIs): domes and bars for vision impairment navigation
Part 4.2	AS 1428.4.2	2018	Wayfinding signs: integrated signage for vision and cognitive impairment
Part 5	AS 1428.5	2021	Assistive listening systems (hearing loops) for people who are deaf or hearing impaired

(verified 2026-05-08: Standards Australia catalogue, AS 1428.1:2021; AS 1428.5:2021 store)

Part 1: General requirements (AS 1428.1:2021)

The primary residential-facing part. Sets minimum design requirements for new building work to provide access for people with a disability. Key elements:

Accessible paths of travel: minimum widths, passing spaces, turning circles (1500 mm x 1500 mm for 60-90 degree turns), surface requirements (slip resistance, carpet pile limits)
Ramps: gradient limits, handrail requirements, landing dimensions
Doorways: clear opening widths, handle type, contrasting visual surround
Sanitary facilities: accessible toilet layout, shower dimensions, grab rail specifications
Signage and controls: tactile and Braille signage, control heights
Glazing and glass panels: visual indicators on transparent surfaces (updated in 2021 edition)

The 2021 edition is largely an update of the 2009 edition, with new provisions for glazing decals, outdoor timber structures, floor drain design, and updated grab rail and shower drainage specifications (verified 2026-05-08: Realm Access, AS 1428.1:2021 now the standard for compliance).

From 29 July 2025, AS 1428.1:2021 is the referenced edition in both NCC 2022 Amendment 2 and the amended Premises Standards (superseding the 2009 edition that was previously referenced) (verified 2026-05-08: ABCB, amended Premises Standards and the NCC).

NCC 2022 Part D4: access for buildings other than Class 1a

NCC 2022 Volume One Part D4 applies to Class 1b, 2, 3, 5, 6, 7, 8, 9, and 10 buildings. Class 1a private houses are excluded. Key DTS references to AS 1428.1 in Part D4:

Ramps: must comply with AS 1428.1 clause 10
Stairs: must comply with AS 1428.1 clause 11
Passing and turning spaces: referenced to AS 1428.1 dimensions
Tactile ground surface indicators: must comply with AS/NZS 1428.4.1
Wheelchair seating spaces: must comply with AS 1428.1

(verified 2026-05-08: NCC 2022 Volume One, Part D4 Access for people with a disability)

NCC 2022 Part H8: Livable Housing Design for Class 1a

For a new Class 1a dwelling (house, townhouse, terrace, villa), the NCC 2022 introduces Part H8 Livable Housing Design. This is the main access obligation for residential builders in most states.

The Part H8 DTS path requires compliance with the ABCB Standard for Livable Housing Design (v1.3), which is based on the Silver level of the Livable Housing Design Guidelines published by Livable Housing Australia. This is separate from AS 1428.1: the Silver standard was specifically adapted for residential housing and in some dimensions has different requirements (for example, the Silver standard allows a 1200 mm x 1200 mm ramp change-of-direction space, while AS 1428.1 requires 1500 mm x 1500 mm) (verified 2026-05-08: ABCB FAQ, Livable Housing Design Standard).

Key Silver standard requirements (verified 2026-05-08: NCC 2022 Part H8 Livable housing design):

Feature	Silver standard requirement
Path of travel	Continuous step-free path from property boundary, garage, or parking space to entrance door
Entrance door	At least one level, step-free entrance door
Internal doorways	820 mm minimum clear opening (habitable rooms, laundry, sanitary compartments, accessible shower)
Corridors	1000 mm minimum clear width between finished wall surfaces (where connected to a compliant door)
Toilet compartment	900 mm minimum between opposing walls (separate WC); 400 mm minimum from toilet pan centreline to adjacent vanity or bath (combined bathroom)
Shower	At least one hobless (step-free) shower with no raised edge
Bathroom walls	Reinforced to accommodate future grabrail installation (12 mm structural plywood, 25 mm timber noggings, or light gauge steel noggings)

State and territory adoption of Part H8

NSW and WA are not adopting Part H8 livable housing requirements for Class 1a. All other states and territories have adopted with staggered commencement dates (verified 2026-05-08: ABCB, NCC 2022 state and territory adoption dates):

Jurisdiction	Part H8 commencement
NT	1 October 2023
QLD	1 October 2023
ACT	15 January 2024
VIC	1 May 2024
SA	1 October 2024
TAS	1 October 2024
NSW	Not adopting
WA	Not adopting

Queensland issued supplementary guidance via the Queensland Development Code Mandatory Part 4.5 (Livable dwellings and grading to floor wastes), which provides additional acceptable solutions alongside the NCC path. An 18-month transitional exemption applied to narrow lots (under 12.5 m wide) and small prefabricated homes, expiring 31 March 2025 (verified 2026-05-08: QBCC, what’s new from 1 October 2023).

What it doesn’t cover

Class 1a houses in NSW and WA: Part H8 does not apply. Builders in those states are not required to comply with the Silver standard for new homes. Voluntary compliance to the Silver standard remains an option and may be required by some private clients or financiers.
Renovations and alterations: the livable housing requirements generally apply to new building work. Renovation triggering thresholds vary by state (e.g. VIC requires compliance for major alterations, with partial compliance available from a building surveyor when full compliance is impractical).
Post-construction fitout: AS 1428.1 addresses design and construction, not ongoing fitout or management obligations under the DDA. Those obligations fall on building owners and occupiers separately.
Class 1a private dwellings and AS 1428.1 directly: AS 1428.1 does not mandate minimum access features in standard private houses (Class 1a). It is used as a guide for home modifications and voluntary compliance, but NCC Part D4 does not call it up for Class 1a. Class 1b (boarding houses, B&Bs) and Class 2 common areas do trigger Part D4.
Workplace access under WHS legislation: access obligations for employer-occupied premises are governed separately under work health and safety law, not the building code.

Practical implications

Check your state before pricing

Part H8 is live in QLD, VIC, SA, TAS, NT, and ACT. If you’re building a new house in those states, budget the Silver standard into your design from day one. Designing it in at DA/building permit stage costs next to nothing. Retrofitting a compliant step-free path or bathroom after frame-up is expensive (verified 2026-05-08: ABCB, new livable housing design requirements).

NSW and WA builders are currently not required to comply for Class 1a, but check whether your state is reviewing its position: both states may revisit adoption as the national policy environment evolves.

Cost impact: roughly 1 to 2% of build cost

ABCB analysis of the combined Modern Homes standards (livable housing plus energy efficiency) puts the total additional build cost at roughly 1 to 2 per cent of the total build cost for an average new house. Queensland government modelling puts the net benefit per house at $2,696.20 once lifetime accessibility and resale value are accounted for (verified 2026-05-08: Queensland Department of Housing, busting myths).

Practically: the main cost items are the hobless shower (waterproof the full floor rather than a hob-contained zone), wider doorways (lintel and frame adjustments at design stage), and the step-free access path (may require ramping or site-level work depending on the lot gradient).

Class 1b and holiday accommodation: AS 1428.1 applies directly

If you’re building a new boarding house, B&B, guest house, or short-term accommodation property (Class 1b), NCC 2022 Part D4 applies and references AS 1428.1:2021 directly. Access to common areas and accessible rooms must comply. Get an access consultant or building designer experienced in Part D4 onboard early.

Certifiers check Part H8 on residential

Building certifiers in states where Part H8 is active will review plans for compliance. The most common review points: the step-free path of travel from street to door (lot gradient and driveway design), door widths on the ground or entry level, bathroom layout (toilet clearances), and the hobless shower specification.

Premises Standards: class 1a is excluded, but DDA applies to short-stay

The Premises Standards (now referencing AS 1428.1:2021 from 29 July 2025) apply to public buildings. A private house used exclusively by its owner is not a public building. However, if a Class 1a property is used as short-term accommodation (Airbnb, holiday let), the applicable building classification shifts: if it is used for short-stay accommodation, it may meet the Class 1b definition, bringing Part D4 and AS 1428.1 into scope at building permit stage.

Source link

AS 1428.1:2021 (paywalled): https://store.standards.org.au/product/as-1428-1-2021

NCC 2022 Volume Two Part H8 Livable Housing Design (free, ABCB account required): https://ncc.abcb.gov.au/editions/ncc-2022/adopted/volume-two/h-class-1-and-10-buildings/part-h8-livable-housing-design

ABCB Standard for Livable Housing Design (free PDF): https://www.abcb.gov.au/sites/default/files/resources/2023/Livable-Housing-Design-Standard-2022-1.3.pdf

NCC 2022 Volume One Part D4 Access for people with a disability (free): https://ncc.abcb.gov.au/editions/ncc-2022/adopted/volume-one/d-access-and-egress/part-d4-access-people-disability

References

Australian Building Codes Board, NCC 2022 Volume Two, Part H8 Livable housing design. https://ncc.abcb.gov.au/editions/ncc-2022/adopted/volume-two/h-class-1-and-10-buildings/part-h8-livable-housing-design (verified 2026-05-08).
Australian Building Codes Board, NCC 2022 Volume One, Part D4 Access for people with a disability. https://ncc.abcb.gov.au/editions/ncc-2022/adopted/volume-one/d-access-and-egress/part-d4-access-people-disability (verified 2026-05-08).
Australian Building Codes Board, FAQ: Livable Housing Design Standard. https://ncc.abcb.gov.au/faq/livable-housing-design-standard (verified 2026-05-08).
Australian Building Codes Board, The amended Premises Standards and the NCC, July 2025. https://www.abcb.gov.au/news/2025/amended-premises-standards-and-ncc (verified 2026-05-08).
Standards Australia, AS 1428.1:2021 Design for access and mobility, Part 1: General requirements for access, new building work. https://www.standards.org.au/standards-catalogue/standard-details?designation=as-1428-1-2021 (verified 2026-05-08).
Queensland Building and Construction Commission, What’s new from 1 October 2023, NCC 2022. https://www.qbcc.qld.gov.au/news/whats-new-1-october-2023-ncc-2022 (verified 2026-05-08).
Queensland Department of Housing and Public Works, Busted: six myths about the Modern Homes standards. https://www.housing.qld.gov.au/initiatives/modern-homes/busting-myths (verified 2026-05-08).
Victorian Building Authority, Livable housing design requirements. https://www.vba.vic.gov.au/building/regulatory-framework/ncc-2022/livable-housing-design-requirements (verified 2026-05-08).
Australian Building Codes Board, NCC 2022 state and territory adoption dates. https://www.abcb.gov.au/ncc-2022-state-and-territory-adoption-dates (verified 2026-05-08).

NCC 2022 Volume Two overview, the NCC framework within which Part H8 sits
NCC structure: BCA, PCA, volumes and building classes, building classification and how it determines which standards apply
AS 3740, wet area waterproofing standard, directly relevant to hobless shower compliance under Part H8
AS/NZS 3000, the Wiring Rules, companion AS in the NCC DTS suite
AS 1684, timber framing standard, structural companion to Part H8 design work