To maintain locks in Washington, DC: lubricate cylinders twice a year with dry graphite or PTFE — never WD-40 — tighten loose hardware, check strike alignment each spring and fall as doors swell and shrink, and replace keys before they wear thin. Questions? (202) 630-4979.
Locks fail slowly and then all at once. Almost every emergency call we take in DC was preceded by weeks of a lock that was “a bit sticky” — a warning nobody acts on until the key snaps off in the cylinder on a Monday morning.
Maintenance is about twenty minutes twice a year. Here is what actually matters, and specifically what matters in DC’s climate and housing stock.
Why does DC weather affect door locks so much?
The District gets humid subtropical summers and freezing winter snaps, and a great deal of its housing is wood-framed and a century old. Wood absorbs moisture in July and gives it back in January, so the door and frame are physically a different size in summer than in winter.
The practical consequence: a deadbolt that throws cleanly in February may bind in August, and a latch that catches fine in summer may rattle loose in winter. People blame the lock. It is usually the door.
This is why the two useful maintenance moments are spring and fall — checking alignment as the seasons turn, before the door is at its worst.
How do I lubricate a lock correctly?
Use a dry lubricant — powdered graphite or a PTFE-based lock lubricant. Apply a small amount into the keyway, insert and withdraw the key several times to distribute it, then wipe the key.
Do not use WD-40. This is the single most common lock mistake. WD-40 is a solvent and water displacer, not a lubricant: it strips out the grease that is already there and leaves a sticky film that attracts dust and grit. The lock feels better for a few weeks, then becomes markedly worse. Oil-based lubricants have the same problem to a lesser degree.
Twice a year is right for most doors. Exterior locks on an exposed entrance — a rowhouse front door with no vestibule, common across Shaw and Petworth — benefit from three times.
What should I check on each door?
- Does the bolt throw fully without lifting or pushing the door? If you have to help it, the strike is misaligned. Fix it now; forcing it repeatedly is what eventually breaks the lock or the key.
- Are the screws tight? Loose hardware wears the internal mechanism. While you are there, replace the short screws in the strike plate with 3-inch screws that reach the wall stud — this is the cheapest security upgrade that exists and dramatically improves kick-in resistance.
- Does the key turn smoothly? Grinding or catching means dirt in the cylinder or a worn key.
- Is the weatherstripping intact? Failed stripping lets moisture into the door edge, which accelerates the swelling problem.
- Do the hinges sag? A dropped door pulls the latch out of alignment with the strike. Tightening or replacing one long hinge screw often lifts it back.
How do I take care of my keys?
Keys wear out, and a worn key damages the lock it is used in. The cut peaks flatten with use, so the key stops lifting the pins to the right height — you start jiggling it, which wears things faster.
Replace a key that has visibly rounded cuts, and always duplicate from the original rather than from a copy, since each generation drifts further from the correct cut depths. If your original is long gone, a locksmith can decode the lock and cut a true original again.
Keep keys off overloaded keyrings, too. A heavy ring hanging from an ignition or a lock cylinder puts constant sideways load on parts that were not designed for it.
What are the warning signs I should not ignore?
Call before it becomes an emergency if you notice any of these:
- The key needs jiggling or a particular angle to work
- The cylinder turns but the bolt does not move, or moves only partway
- You hear grinding or feel grit when turning the key
- The key comes out with a metallic residue on it
- The knob or lever has visible play in it
- The door has to be pulled or lifted to lock
Any one of these is a service call. All of them, left alone, become a lockout — and a lockout at $145+, costs considerably more than the visit that would have prevented it.
Frequently asked questions
How often should I lubricate my locks?
Twice a year for most doors, three times for exposed exterior locks. Spring and fall are the natural moments, since that is also when DC’s seasonal door movement shows up.
What lubricant should I use on a door lock?
Dry graphite powder or a PTFE-based lock lubricant. Avoid WD-40 and general-purpose oils — they strip existing lubricant and leave residue that collects grit.
Why does my deadbolt stick in the summer?
DC’s summer humidity swells wooden doors and frames, pushing the bolt out of line with the strike. Adjusting the strike plate usually solves it permanently. If the door swells enough to bind on the frame itself, it may need planing.
How long should a door lock last?
A quality deadbolt that is maintained lasts well over a decade. A neglected one, or a cheap one on a heavily used exterior door, can fail in a few years. Exposure and use matter more than age alone.
Can a locksmith service locks without replacing them?
Yes, and it is usually the cheaper outcome. Cleaning, lubricating, repinning, and realigning a lock and strike all extend the life of hardware you already own. We recommend replacement only when the lock is genuinely worn out or you want a security upgrade.
Want it checked properly?
Lock repair starts at $85+ and broken key extraction at $85+ — a maintenance visit is a great deal cheaper than an emergency one. Mr. Locksmith DC services and repairs locks throughout Washington, DC. We work across all four quadrants, including Shaw, Logan Circle, and the U Street Corridor.
Call (202) 630-4979 or see our residential locksmith services.
