Types of Door Locks

Updated February 12, 2018

There are many different types of door locks, from simple indoor privacy locks to the most secure exterior locks. When deciding on doorknobs and locks, you need to determine your security needs and whether certain types of door locks are worth the extra expense. A review of possibilities at a home improvement store can help.

Privacy Lock

A privacy door lock is an interior type and does not provide any real security. This doorknob, or lever, has a lock button on the inside but no key function on the outside. A narrow slot on the outside allows for a thin object to be inserted, which can push out the lock button if necessary.

Moderate Security

A standard exterior door lock includes a doorknob that locks and unlocks from the inside with a button turned or pressed, and locks and unlocks from the outside with a key.


Higher-level security can be achieved with a deadbolt that operates with a key from the outside, and a turning knob on the inside. The bolt moves from the doorknob apparatus into a slot in the frame.

Surface-Mount Deadbolt

A surface-mount deadbolt is another option, with a D-shaped or rectangular housing mounted on the back of the door.

Keyless Locks

Keyless door locks also are available for advanced security as well as convenience. These involve entering a code to unlock the door.

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About the Author

Shelley Moore is a journalist and award-winning short-story writer. She specializes in writing about personal development, health, careers and personal finance. Moore has been published in "Family Circle" magazine and the "Milwaukee Sentinel" newspaper, along with numerous other national and regional magazines, daily and weekly newspapers and corporate publications. She has a Bachelor of Science in psychology.