Locking window open overnight

[bsr]

Hello

My new house has back bedrooms which are easily accessible from the ground. A burglar could easily get (without a ladder) onto the flat roofed extension and from there to the uPVC casement windows which would be at waist height.

What's the best way to secure the window open for ventilation at night? The cable restrictors look to be flimsy and more about fall protection than safety. Could the "Boa" type look be opened from outside? Any other thoughts?

To clarify I'm looking for secure ventilation while the house is occupied. Windows would be shut when the house was empty.

Thanks

bsr

 

[foxhole]

https://www.reddiseals.com/product/...FFhJ7XJ5Ag5cNS5k9udY-4JMN_iKN8PRoCbykQAvD_BwE

 

[bsr]

Thanks but that's for top opening windows only and mine is side opening. Also that looks like a burgular could easily open it.

 

[Notch7]

Maybe a cable restrictor

https://www.sashjack.co.uk

 

[bsr]

Hello

I got one of these in the end: Jacloc "Robust". Easy enough to fit and looks considerably stronger than the standard 3mm steel cable ones.

 

[foxhole]

Thanks but that's for top opening windows only and mine is side opening. Also that looks like a burgular could easily open it.

Have them fitted to my side opening window .