Sliding patio doors and French doors showing anti-lift devices, secure tracks, shoot bolts and an anti-snap cylinder.

Patio Door Security: How to Stop Sliding and French Doors Being Forced

Good patio door security comes down to three checks. Can the door be lifted or pushed out of its frame, does every locking point actually engage, and can the cylinder be snapped from outside? Sliding doors usually fail on the first, French doors on the second, and both share the third. The fixes below start…