Since many French doors are chosen for an opening between indoors and out, the following security measures are recommended to prevent break-ins.

1. Install a deadbolt lock that has a horizontal bolt at least 1 inch long.

2. Install a reinforced strike plate that is at least 18 inches in length and requires 3-inch screws.

3. Make sure the hinges are installed on the inside so that burglars cannot remove the pins.

4. Consider installing metal reinforcement around the door where it’s been drilled to accept the lock and knob.

5. Also consider installing a double-cylinder deadbolt that requires a key to open on the inside and the outside. This will prevent a burglar from just breaking the glass and reaching in to open the door. However, you will need to keep the key in a handy location in case of fire or other emergency.