Next put a new latch in and replace the door knob.
How to install door lock.
Doorknob locks offer little resistance to a determined burglar and what other kind of burglar is there.
Alternatively you can buy a re keying kit for the lock you already have.
Deadbolt locks extend through the doorframe and into the wall.
If your new deadbolt has a concealed screw for the interior door knob consult the installation instructions for your specific lock.
Once you have the kit remove the lock cylinder from the door knob so you can change the pins inside.
If you re installing a lockset in an existing door take out the old lockset and measure the backset the distance from the door edge to the center of the lockset hole.
Installing a deadbolt lock is essential to protecting your home.
To change the lock on a regular door knob first use a screwdriver to remove the door knob and the old latch.
The measurement is usually 2 3 8 inches for interior doors and 2 3 4 inches for exterior doors.