Replace front door locks with American National Standards Institute Grade One or Two deadbolts, ensuring that the deadbolt strike plate is also replaced with a box strike model with full metal enclosure. Choose screws at least 3 inches long that go all the way through the security plate into the wood frame. If the door is beside a window, use a double cylinder lock that requires a key on the inside in place of a thumb-turn deadbolt.
Unscrew and remove the old door deadbolt and cylinder. Measure backset distance and the hole size before opting for a new deadbolt. Remove and the existing lockset and deadbolt strike plates with heavy duty plates that feature four screws instead of two.
Choose double cylinder deadbolts that are keyed on both sides if these are permissible by local building codes for fire safety. Fit the new deadbolt into the door hole and follow it up with the deadbolt cylinder. Hand drive the screws, making sure that they go through the plate into the door wood.
When changing a home's front door locks, opt for custom locks rather than easily available door locks at local stores. Use registered key and lock codes that offer higher security. Additionally, consider opting for an electronic front door lock that is easy to use eliminates the risk of lost or duplicate keys.