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An upstairs bedroom window without its 125mm stop: a Truganina handover item

First floor bedroom windows without opening restriction at two Truganina handovers. Why the item sits at the top of the report, not among the paint touch ups.

  • Truganina 3029
  • 18 September 2026
  • 3 min read
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In short: Most handover findings are about finish. A window that opens wide on an upper floor is about whether a child can fall through it, and it turned up on two Truganina handovers.

The finding

At Truganina handovers in August 2025 and April 2026, first floor bedroom windows did not have the opening restriction they needed. The inspector's note on both said the same thing: the windows must be restricted to 125mm to prevent a child from falling.

Why 125mm

The NCC requires openable windows in bedrooms to be restricted where the floor below is far enough down to be a fall risk and the sill is low enough to climb. The 125mm limit is small enough that a young child cannot get through.

Why it is easy to miss

The window looks finished. It opens and closes, the glass is clean and the frame is sealed. Only opening it fully, upstairs, shows that nothing stops it.

Fixing it

A compliant restrictor can usually be fitted to the existing window by the window supplier or builder. It is a short job, and it should be done before anyone moves in.

Where it sits in the report

We put safety items like this at the top of the handover report, above roof and finishing items, so they are dealt with first. On those same Truganina double storey homes the roof list was long too, but the window was the one item that could not wait.

Written by our local inspection team from work carried out in Truganina. Licensed building practitioners, Building & Plumbing Commission registration CDB-U 53425.

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FAQ

Questions Truganina owners ask about this

Is a single storey home affected by the 125mm rule?

It applies where the fall height makes it a risk, which in practice means upper floors.

Could I just fit a window restrictor myself?

You can, but at handover it is the builder's item to complete.

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