Balcony door/patio door Securing against break-in

All an intruder needs is a screwdriver and he/she can prise open an unsecured patio or balcony door in seconds.

And then he's in, inside your own four walls. Don't take chances and secure windows, patio doors and balcony doors against intruders.

This is what we recommend for you: 
One security lock per metre is the rule of thumb. For a very large window – for example, floor-to-ceiling patio windows or other large windows – reckon on around three additional security locks.