Take care to measure carefully as matching the size can be especially problematic in older homes.
How to change door lock keys.
Alternatively you can buy a re keying kit for the lock you already have.
Before you learn how to change door locks measure the space where you ll install the replacement.
Change the locks when your keys have been lost or stolen.
Once you have the kit remove the lock cylinder from the door knob so you can change the pins inside.
Measure the diameter of the holes currently cut out of your door so you can select a new door lock that fits those dimensions.
To change the lock on a regular door knob first use a screwdriver to remove the door knob and the old latch.
I don t recommend the you change it locks too many ways to screw them up.
Having the combination changed is more affordable.
How to re key a door lock change your locks yourself by removing the lock cylinder and changing the pins.
If you have a window in or next to the door a lock with key cylinders on both sides is preferable as long as local codes allow and you keep a key within reach.
I am a locksmith with 35 years experience.
Next put a new latch in and replace the door knob.