Before you learn how to change door locks measure the space where you ll install the replacement.
How to replace a door lock and deadbolt.
Most internally latched locks are also deadbolts so replacing the lock won t require extra holes.
To change a deadbolt lock start by unscrewing the old deadbolt and removing the interior and exterior faceplates.
Take care to measure carefully as matching the size can be especially problematic in older homes.
You ll pay from 40 to 300 to buy a new door lock depending on design materials and whether it s a simple key in knob lock or a high end lock and handle combo with.