A deadbolt is the lock that actually holds a door shut against force. Picking the right one, and fitting it properly, matters more than most people think.
Start with the grade
Deadbolts are commonly rated under ANSI/BHMA standards, from Grade 1, the most robust, to Grade 3. For front doors and the door from the garage, Grade 1 or Grade 2 is the sensible choice.
Single or double cylinder?
A single-cylinder deadbolt has a key outside and a thumb turn inside. A double-cylinder model needs a key on both sides, which can slow escape in a fire. Check local codes and think hard before putting one on a door you'd use to get out.
Keypad and smart deadbolts
No keys to carry, and temporary codes for a dog walker or contractor. Choose one with a mechanical key override, and change the batteries on a schedule.
Installation is half the security
- The bolt should extend fully, at least an inch.
- Use a reinforced strike plate with long screws into the wall stud.
- The door should close without pushing, so the bolt throws freely.
Between tenants
For rentals, rekeying the existing deadbolt is often enough. Replace it if it's worn or below Grade 2. More on our residential page.
