Deadbolt Lock
Definition and meaning of Deadbolt Lock in real estate.
A deadbolt lock is a security locking mechanism that utilizes a solid bolt that must be manually turned with a key or thumbturn rather than being held in place by a spring. This design makes the lock highly resistant to physical force and bypass techniques.
In more detail
Deadbolts are standard security features on residential exterior doors because they provide superior protection compared to spring-latch locks. While spring locks can sometimes be forced open with a plastic card or simple tools, a deadbolt bolt extends deep into the door frame and cannot be retracted without turning the lock cylinder.
There are single-cylinder deadbolts, which have a keyhole on the outside and a thumbturn on the inside, and double-cylinder deadbolts, which require a key on both sides. Building codes in many states restrict double-cylinder deadbolts due to safety concerns during a fire.
Key facts
| Category | Property Types & Construction |
|---|---|
| Mechanism type | Manual throw bolt that cannot be retracted by applying pressure to the bolt itself |
| Primary purpose | Enhancing home security on exterior perimeter doors |
| Safety consideration | Double-cylinder models require a key inside, which can delay escape during emergencies |
To secure her new home, a buyer installs single-cylinder deadbolt locks on all exterior entryways to complement the standard locking doorknobs.
Frequently asked questions
What is the difference between a single-cylinder and a double-cylinder deadbolt?
A single-cylinder deadbolt utilizes a thumbturn on the interior side, while a double-cylinder deadbolt requires a key to lock and unlock from both the inside and outside.
Are deadbolt locks required by homeowners insurance?
Many insurance providers require deadbolt locks on exterior doors to qualify for standard policies or to receive discount rates on home security.