Lock Repair in Cambridge, MA

What a Massachusetts winter does to a lock

Meltwater that gets into an exterior cylinder can turn to ice there overnight, leaving a key that will not turn in the morning. Forcing it is how a stuck lock becomes a damaged one.

NOAA's state climate summary warns that the coastline faces high exposure to nor'easters, tropical storms and hurricanes. Wind-driven rain reaches keyways and latch mechanisms, and hardware that stays wet corrodes and stiffens.

Wood doors that move

In East Cambridge, the Cambridge Historical Commission's study notes, the first homes were small wood-frame workers' cottages, and old wood doors swell and shrink with the seasons. The usual sign is a deadbolt that only throws if you push or lift the door. That points to a strike plate that needs adjusting, not a failed lock, and forcing the bolt wears it out sooner.

Entry doors that must latch

In a residence with more than three units, 105 CMR 410.270, the State Sanitary Code's lock rule, requires the main entry door to close and lock automatically, with limited exceptions. If a closer has gone weak or a latch no longer catches, the building's front door stands open to anyone, so report it to the owner, who is responsible for maintaining it. This is general information, not legal advice.

Simple upkeep

• Use a dry lock lubricant rather than oil, which collects grit.
• Never force a key that will not turn; a twisted key can snap and need broken key extraction.
• After a storm reaches your door, rinse, dry and relubricate the exterior hardware.
• Tighten loose knob and lever screws before the play wears the latch.

If a lock still sticks after that, send a lock repair request that describes the door, the lock and the symptom, with a photo of both sides. The Cambridge page covers local housing in more detail.