Who Owns the Lock: Your Door, the Gate, and the Lobby

Most people in this city pass through at least two locks to get home: a gate or a lobby door at the pavement, and then their own. In a Mission flat it is an iron gate and a flat door. On Nob Hill it is a lobby and a unit door. In a Sunset rowhouse divided into two it is a street door and the door at the top of the stairs.

Those two locks belong to different people, and that is the whole of this article. Your own door is yours. The shared one is the building's, which means the owner, the landlord, the managing agent or the homeowners association.

It sounds like a technicality until you are standing outside at midnight, or until you are trying to arrange a rekey and discover halfway through that you are not the person who can authorise it.

Your own unit door: everything. Opened if you are locked out, rekeyed if a roommate has moved out, replaced if the cylinder has given up. Rekeying is $28 to $46 per cylinder and it retires every key already out there, which is the point of doing it.

If you rent, that still holds for opening. Getting back into the place you pay for needs identification tying you to the address and nothing else. Changing hardware on a rented door is different: that needs your landlord's agreement, because the lock is part of the property rather than part of your belongings.

Anything private to you inside a shared building — a storage cage you were assigned, a letterbox that is yours — usually follows the same logic, but it is worth naming on the call rather than assuming.

The street gate, the lobby door, the mailroom, the door to the roof stair, a shared laundry: all of these are common property, and changing their locks affects every resident. That request has to come from the owner, the manager or the association, and no reputable locksmith will rekey one on a single resident's say-so.

That does not mean you are stuck outside. A resident locked out of a shared door gets let in, at any hour, on the same proof that gets you through your own: ID with the address, or ID plus a lease page, a rent statement or addressed mail. Opening is not the same as changing.

If the shared lock is genuinely failing, the useful thing a resident can do is report it and pass the number along. A manager can authorise the work in one phone call, and it is a great deal faster than a chain of emails after somebody has been stuck outside twice.

The panel by the gate, the wiring behind it and the electric release it triggers are not locksmithing. They are electrical work and they belong to a different trade, and any locksmith telling you otherwise is guessing at your expense.

What that means in practice is simple. If the buzzer is dead and you are outside, the way in is the mechanical lock, and that is something we can do tonight. The panel itself is a job for your building on a weekday.

It is worth saying on the call, because it changes what turns up. A technician arriving expecting to be buzzed through a gate that no longer buzzes is a wasted trip for both of us.