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tbc
Has anyone got any experience of fitting things to UPVC windows that involve drilling into them?

We need to fit some window restrictors like these ones to stop toddlers jumping out.

My concerns:
- Doing something bad to the window. Won't it undo the benefit of double glazing? And don't double-glazed windows have some kind of gas in between the panes?
- How to cover/fill holes once our toddlers can be trusted to avoid throwing themselves out

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stevo_com in reply to @tbc

When we got our Everest sash windows, I was told that there was wood behind the pvc where I wanted to hang blinds. There wasn't, it was hollow. I put the blinds up anyway and they didn't come down in over a year's use. As for filling, I didn't have to worry as our builder knackered some of the outer trim around the window which Everest replaced under warranty. We got them to fit wider trim which covered the holes. You may get an acceptable finish with some silicone though.

The DG properties are in the glazing unit, which unless you're drilling right on the edge of the pane, there shouldn't be a problem. You could use some silicone or adhesive behind what you're fitting, which would help with the durability concern, but would also be more faff to delete further down the line.

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