Install a concealed lock for french doors.
Securing french door from inside.
This means anyone can remove the pins and take the doors off the hinges.
The best french door security will have a 3 point locking system.
French doors are difficult to secure for several reasons involving the following weak spots.
Use a door barricade.
Because french doors have no center frame or support they are very weak in the center.
Install a commercial grade double sided deadbolt into the active side of the door or alternatively install a double side high security deadbolt into the active side of the french door.
For doors that come as a pair consider locking securing one of them permanently.
The stop should be 3 4 inch or thicker hardwood that extends the length of the door and overlaps the swinging door by 1 2.
Traditional wood french doors have many small panes of glass.
Out of all the locking options to secure a french door a single sided deadbolt is the best option.
When french doors open outward the hinges are exposed on the outside.
Alternatively glue and screw a stop on the inside edge of the fixed door.
However a deadbolt that locks both doors together and single sided deadbolts in the top and bottom of both doors are a good combination for securing both doors.
To do this we.
My absolutely favorite method is the nightlock security door barricade from amazon.
This alone will make it a lot more difficult for a burglar to force the doors open.
How to secure french doors from burglars.