The Australian Standard for grab rails — in plain English

AS 1428.1 is the Australian Standard for access and mobility. The 2021 edition was adopted by the National Construction Code on 29 July 2025, which means it's the rulebook for any new or modified accessible bathroom in Australia. Below are the numbers that matter for grab rails.

The rail itself

• Diameter: 30–40 mm. Smaller feels flimsy; larger is hard to grip.
• Finish: anti-slip. Knurled, powder-coated or peened — but not polished.
• Material: stainless steel, nylon-coated, or powder-coated steel. Australian-made rails dominate the market (Home Handrails, Canterbury Concepts "studreach", Bendtech "Home Assist"); imported rails must meet AS/NZS.

Clearance

50 mm between rail and wall. A hand needs to fit all the way around.

Load

• Every rail must withstand 1,100 N from any direction at any point along its length.
• Minimum 110 kg load.

Heights

• Horizontal toilet rail: 800–810 mm above finished floor.
• Horizontal toilet rail extension: at least 450 mm forward of the front of the toilet pan.
• Horizontal shower rail: 800–810 mm above the finished shower floor.
• Horizontal shower rail length: at least 1,200 mm across the main shower wall.
• Vertical rails (step-in / entry): position depends on the user; AS 1428.1 allows clinical judgement. OT scope of works specifies exact position for funded jobs.

Wall reinforcement (the NDIS builders' guidance)

NDIS Home Modifications Guidance for Builders and Designers requires fixings into: noggings, studs, wall trimmers, or at least 12 mm structural plywood. If none of those are present, the wall has to be opened and reinforced before the rail goes in. I quote that separately.

Authoritative sources

• Standards Australia — AS 1428.1-2021 (purchase via SAI Global / Intertek Inform).
• NDIS Home Modifications Guidance for Builders and Designers — ndis.gov.au
• NCC 2022 Amendment (adopting AS 1428.1-2021 from 29 July 2025) — Australian Building Codes Board.

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Email me at rob@grabsafe.com.au or use the form on my contact page. I reply within one business day.