AS 5203: the test standard for child window restrictors
AS 5203:2016 sets the test sequence for child window restrictors and safety screens, called up by NCC Housing Provisions Part 11.5.
Ask Chalkline about this →AS 5203:2016, Protection of openable windows/fall prevention: Test sequence and compliance method is the Australian Standard that defines how window restrictors and barrier screens are tested for child-fall protection (verified 2026-06-11, Intertek Inform).
The 2016 edition is current.
What the standard covers
AS 5203 specifies performance criteria and test sequences for:
- Restrictor devices — cable restrictors, scissor restrictors, and friction-stay limit pins that cap the window opening at 125 mm.
- Barrier screens — structural screens tested as a fixed barrier in place of a separate device.
The core test pushes a 125 mm diameter sphere against the restricted opening under 250 Newtons of force; the assembly must prevent passage both during and after loading (verified 2026-06-11, Remsafe). Results are specific to the window type and size tested — awning, casement, and sliding windows each require their own test result.
A standard fly screen does not satisfy AS 5203. Only a screen specifically tested to this standard qualifies.
NCC call-up
Class 1 buildings (houses): the ABCB Housing Provisions Part 11.5 requires any window restrictor or barrier screen fitted to a Class 1 building to comply with AS 5203:2016 where the opening is 2 m or more above the surface below and can open wider than 125 mm.
Class 2 buildings (apartments): NCC 2022 Volume One carries an equivalent provision for Class 2, referencing the same standard.
See window restrictor for the full rule on when a device is mandatory and the two-step release requirement.
For a builder
Specify restrictors that carry a test certificate to AS 5203:2016 for the window type being installed. Manufacturer stickers are not sufficient — the accredited-lab certificate is the defects evidence trail.
Category: Standard / child safety.
Related
See also
References
- Standards Australia, AS 5203:2016. Current edition confirmed 2026-06-11, Intertek Inform.
- Remsafe Window Locks, New Australian Standard for Fall Prevention from Openable Windows (verified 2026-06-11).
Last updated: 2026-06-11. Verified: 2026-06-11. Quarterly review for NCC and standard currency.