Why Deadbolt Locks Are a Great Choice for Home Security
If your exterior doors only have a knob lock, adding a deadbolt is one of the most effective security upgrades you can make. Here's why, and what to look for.
What is a deadbolt?
A knob or lever lock uses a spring latch with an angled edge, which is convenient but can sometimes be pushed back with a thin tool. A deadbolt uses a solid, square-ended bolt that only moves when you turn the key or thumb-turn. It extends deeper into the door frame, typically around an inch, making it much harder to force.
Single or double cylinder?
- Single cylinder: a key outside, a thumb-turn inside. This is the most common choice for homes.
- Double cylinder: a key on both sides. It can help on doors with glass near the lock, but it can slow escape in a fire. Check local codes and think carefully before choosing one.
What do the grades mean?
Locks sold in the US are often tested to ANSI/BHMA standards. Grade 1 is the toughest, built for heavy use and high resistance to attack. Grade 2 is a solid residential choice. Grade 3 is the basic level. For exterior doors, grade 1 or grade 2 is a sensible target.
Installation matters as much as the lock
A strong deadbolt in a weak frame can still fail. Look for:
- A reinforced strike plate fastened with long screws (around three inches) that reach the wall framing
- A bolt that fully extends into the strike without rubbing
- A solid door, not a hollow-core interior door
Smart deadbolts
Many keyless and smart locks are deadbolts with an electronic keypad. Choose models with a mechanical key override and replace batteries on schedule.
Getting one installed
A locksmith can fit a deadbolt to a door that's never had one, replace an old one or rekey it to match your other locks. New lock installation on a door without a hole is listed on our price list. In Anaheim, call 714-660-0112.
