When a deadbolt won't throw fully — or the door won't lock unless you lift and yank it — the lock itself is usually fine. The problem is almost always that the bolt and the hole it's supposed to slide into have drifted out of line.
Why it happens
Doors move. Seasonal humidity swells the wood, the house settles, hinges loosen, and weatherstripping compresses — any of which shifts the bolt a fraction of an inch off the strike plate hole. That's enough to stop the bolt from sliding home. You'll often see fresh scrape marks on the strike plate where the bolt has been catching.
What to try, and when to call a pro
- Find the misalignment — mark the bolt with lipstick or a marker, throw it against the plate, and see where it's hitting.
- Tighten the hinges — a sagging door often lifts back into place with snug hinge screws (or one longer screw into the frame).
- Adjust the strike plate — filing the hole slightly or repositioning the plate can recapture the bolt; bigger gaps need the plate moved.
- If the bolt itself feels gritty, sticky, or loose in the door, the lock mechanism may be failing — that's a rekey or replacement.
Alignment fixes are doable, but if the door has dropped noticeably or the lock feels like it's failing internally, a locksmith will sort it quickly — realigning, adjusting the strike, or replacing the deadbolt. Roger matches you to one vetted local locksmith, home and business only, with the price range upfront.
Describe the problem — Roger matches you to one vetted local pro and books it. $0 to you.
Common questions
- Why won't my deadbolt lock all the way?
- Almost always alignment — the door has shifted (humidity, settling, loose hinges) so the bolt no longer lines up with the strike plate hole. Look for scrape marks on the plate to confirm.
- How do I fix a door that won't lock?
- Find where the bolt is catching (mark it and throw it against the plate), tighten sagging hinges, and adjust or reposition the strike plate. If the bolt itself feels gritty or loose, the lock may need rekeying or replacing.
- Is a deadbolt that won't lock a security risk?
- Yes — a door that isn't fully locked isn't secure. Fix the alignment promptly, or have a locksmith adjust or replace the deadbolt so it throws fully every time.