A passage lock holds an interior door shut but never locks. A privacy lock adds an inside button or turn for occupant comfort, usually with an emergency release on the outside. A keyed lock controls entry from outside with a key. As a rule of thumb: passage for halls and closets, privacy for bedrooms and bathrooms, keyed for offices and storage. Choose by who the door must stop and how it opens in a hurry.
Start with who the door has to stop
Interior door hardware is sold by function, meaning what the handle does on each side of the door. Strength is not the deciding factor. Interior locks are light hardware, and a determined person gets past any of them. The useful questions are who the door has to stop and how someone gets through it in a hurry. The answers sort each interior door into one of three jobs: staying closed, giving the person inside privacy, or keeping out anyone without a key.
Passage and privacy: closed is not the same as private
A passage set has a latch, the spring-loaded tongue that clicks into the frame, and handles that always turn on both sides. The door stays shut, but anyone can open it from either side. Hall closets, pantries, and laundry doors rarely need more.
A privacy set adds a push button or thumb turn on the inside. Engage it and the outside handle stops turning, so nobody walks in by accident. On many privacy sets, turning the inside handle pops the button back out, so you cannot leave the room and forget it is locked. A privacy lock tells people the room is occupied. It is not built to stop someone who wants in.
Privacy sets usually include an emergency release on the outside handle. It lets someone outside open the door when the person inside cannot, such as a toddler who pushed the button or an adult who fell ill. That quick way in is why privacy sets suit bathrooms and bedrooms. The occupant gets privacy, and the household keeps access.
Keyed interior locks: controlling who comes in
A keyed interior lock has a cylinder, the part the key turns, on the outside. In an office-style function, a button inside locks the outside handle and a key opens it again. In a storeroom-style function, the outside handle stays locked at all times and only a key opens it, while the inside handle always lets you out.
A keyed function makes sense when what sits behind the door must be kept from someone: a home office with records, a storage or utility room, a supply closet at work, or a shared room in a building where only some people belong.
The real cost of a keyed lock is key management. Someone has to track who holds keys and what happens when a person moves out or leaves a job. A storeroom function also locks behind you when the door closes, which makes lockouts easy. Keyed does not mean high-security, either. A typical interior keyed set controls casual access and nothing more. On commercial doors where many people need different access, physical keys get hard to track, and access control, which lets people in by card or code instead of a key, becomes the next question.
Which lock function goes on which interior door?
Work through each door in this order:
- Occupant safety first. If a child, an older relative, or anyone who might need help could be inside, the door needs a fast way in from outside: passage, or privacy with its release.
- Access control second. If what is behind the door must be kept from others in the home or building, a keyed function earns its place.
- Key management last. Decide who holds keys and what happens when one goes missing. If nobody can answer that, privacy may be the better fit.
Applied room by room, that sequence usually lands here:
- Halls, closets, pantries, and laundry: passage.
- Bathrooms and adult bedrooms: privacy.
- Young children's bedrooms: passage, or privacy if the adults know where the release is.
- Home office, storage, and utility rooms: keyed, storeroom-style if the door should always lock.
- Shared rooms in a multi-tenant or commercial building: keyed, with a clear record of who holds keys.
Look at the door before you buy hardware. Worn or unusual holes, a split edge, or a frame that no longer meets the latch can mean the door needs work before a new set goes on.
NoMad Locksmith & Security handles door repair and installation and lock change and rekey work for homes and businesses in NoMad and nearby Manhattan neighborhoods. Non-emergency work is by appointment. If you want a door checked or its function changed, call (917) 337-9703.
Frequently asked questions
Can I convert a passage handle into a privacy or keyed lock without replacing the door?
Converting a passage handle to a privacy or keyed function is usually a matter of replacing the handle set, not the door. Most interior doors are drilled in a common pattern, and a set with a different function often fits the same holes and latch. The exceptions are doors with worn or unusual holes, a damaged edge, or an older latch style, which may need repair before new hardware goes on.
Why does my bathroom privacy lock have a small hole on the outside?
The small hole or slot on the outside of a bathroom privacy lock is an emergency release, not a keyhole. Its job is to let someone outside open the door if the person inside cannot. Because anyone who knows about the release can use it, a privacy lock signals that the room is occupied rather than keeping anyone out. Make sure the adults in the home know it is there.
Should a child's bedroom have a privacy lock?
Whether a child's bedroom gets a privacy lock depends mostly on the child's age and how quickly an adult needs to get in. For a young child, many households choose a passage set so the door never locks. An older child who wants privacy can have a privacy set, since the outside release still gives an adult a way in. A keyed lock suits a child's room poorly because getting in depends on finding the key.
If I lock a keyed interior door and lose the key, what are my options?
When a keyed interior door is locked and the key is lost, first check whether a roommate, family member, or property manager holds a spare. If the key is gone for good and could end up with the wrong person, rekeying the lock so the old key stops working, or replacing the lock, takes that key out of play. Keeping a spare with a second person is the simplest way to avoid the problem with a keyed interior lock.
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