A door lock that rubs against the frame is often working fine. The door has usually shifted instead, because the hinges have sagged or worked loose, so the latch or deadbolt no longer meets the strike opening squarely. The gaps around the door, where the scuff marks fall, and whether the lock turns freely with the door open will usually show which side is responsible.
Why a door that has moved makes a good lock rub
A door hangs from hinges on one side, and the top hinge carries most of the pull as the door's weight tries to tip it away from the frame. When that hinge wears or its screws loosen, the latch side of the door drops a little. The latch and deadbolt drop with it.
The bolt then meets the strike plate, the metal plate on the frame with the opening the bolt slides into, slightly low or off to one side. You feel that as scraping, a bolt that only throws when you push or lift the door, or a key that turns hard only when the door is shut. None of it requires anything inside the lock to be wrong.
What the gaps, scuffs, and hinges show
Start with the door closed and look at the gap between the door and the frame. A door that hangs true shows a fairly even line along the top and down the latch edge.
- A latch-side gap that is wider near the bottom than the top, with the top corner tight or rubbing, suggests the door has tipped on its hinges.
- A gap across the top that widens toward the latch side points the same way.
- A gap on the hinge side that opens near the top hinge suggests that hinge has pulled loose.
The strike plate keeps a record of where the bolt actually lands, in shiny scrapes or worn paint. A mark below the opening means the bolt arrives low, which fits a sagging door. A mark above it leans toward a strike plate or frame that has shifted.
Your own hand is another clue. If the bolt only throws when you lift the handle or press the door inward, you are pulling the door back into line for a moment, and the lock is doing its job once it gets the chance.
Then open the door, hold the latch edge, and rock it gently up and down while watching the hinges. If a hinge leaf, one of the two flat plates that make up the hinge, shifts or a screw head moves, that hinge is loose.
Hinges, strike, or lock: telling them apart
The most useful test is to work the lock with the door standing open. If the bolt and latch move smoothly and fully when nothing touches them, the mechanism is working and the trouble is alignment. If the bolt feels stiff or stops short even with the door open, the lock hardware is more suspect.
Hinge sag or loose hinges
Uneven gaps, a scuff below the strike, hinge leaves that move, and a lock that works fine open. A new lock will not help here, because the door itself is out of line.
A shifted strike plate or frame
Even gaps and solid hinges, yet the bolt still lands off the opening. The door hangs right, but the target has moved.
A worn lock or latch
Stiffness with the door open, a latch that does not spring back fully, or a key that feels rough in the cylinder. Repairing or replacing the lock makes sense in this case.
These causes overlap. A door that has sagged for a long time can wear the latch from constant scraping, so a lock can be damaged without being the original problem. Replacing it while the door still hangs crooked tends to bring the scraping back.
A safe next step, and what to report
Stop forcing the key or slamming the door to make the bolt catch. A key twisted against a bound bolt can bend or snap.
If a hinge screw is plainly loose and you are comfortable with a screwdriver, snugging it is reasonable. If the screw spins without tightening, the hole is likely stripped, so leave it. Do not file, bend, or remove the strike plate to chase the fit.
When the door still rubs after the loose screws are tight, or the lock binds with the door open, the fix has moved past a quick check. Nostrand Locksmith in Bedford-Stuyvesant handles door hardware and repair, lock changes and rekeying when the lock itself proves worn, and commercial locksmith work. Call (516) 644-8976 and describe which edge rubs, where the scuff marks sit, whether the lock is stiff with the door open, and whether a hinge moved when you rocked the door.
Frequently asked questions
Can a sagging door make a deadbolt hard to turn?
Yes. When a door sags, the deadbolt presses against the edge of the strike plate instead of sliding into the opening, so the key has to drive the bolt against metal. That is why a deadbolt can feel stiff only when the door is shut. If the same deadbolt turns easily with the door open, the sag is the cause and a new lock will not fix it.
Should I replace the lock if the latch only sticks in humid weather?
A latch that sticks only in humid weather usually points to the door, not the lock. Wood doors and frames can swell with moisture, which tightens the fit against the strike. If the lock works smoothly with the door open on those days, replacing it is unlikely to help.
Is it a problem if the key turns but the bolt will not fully extend?
A deadbolt that will not fully extend is being stopped by something. With the door closed, the bolt may be hitting the edge of the strike plate, or the pocket behind the strike may be too shallow or blocked. If the bolt stops short even with the door open, the problem is inside the lock itself and the lock needs attention.
Does a door that rubs at the top mean something different from one that rubs at the bottom?
Where a door rubs narrows the cause. A rub at the top corner on the latch side usually means a loose or worn top hinge is letting the door tip, and a rub near the bottom on the latch end is often the same tip seen from below. A rub spread evenly along a whole edge points less to the hinges and more to swelling or the frame.