How to read where the latch is landing, the cheap fixes that sort out most doors, and which problems belong to a carpenter instead of a locksmith.
When a door won't latch, the latch bolt and the opening in the strike plate have stopped lining up, or the door can't close far enough for the bolt to drop in. The fix usually starts at the hinges: tighten the top hinge screws or swap a couple for long screws into the framing, then adjust the strike plate if it still misses. A new door knob is rarely the answer.
Before you reach for a screwdriver, find out where the bolt is landing. Rub a little chalk, lipstick or dry-erase marker on the end of the latch bolt, close the door gently against the strike and open it again. The mark tells you which of three problems you have.
A mark on the strike plate above or below the opening means the door has shifted. The usual story is sag: the top hinge has worked loose, the door has dropped at the latch side, and the gap along the top is now tight at the latch corner and wide near the hinges. The bolt lands low and skates off the lip. Check the hinges before you touch the strike.
If the mark sits level with the opening but the door stops short, something is holding it back: a door or frame swollen after rain, weatherstripping that's too thick, a warp that meets the stop at one corner, or a strike set too far out. This is the door that only latches if you body-check it, the one everyone in the house has quietly learned to shoulder shut.
Open the door, press the latch bolt in with a finger and let go. It should snap straight back out. If it creeps out slowly, stays in, or doesn't pull back when you turn the knob, the problem is on or inside the latch itself, not the alignment.
Work from the hinges toward the strike, in that order. Moving the strike first just chases a door that's still sagging, and you end up with a strike plate surrounded by extra holes.
Open the door, hold it by the latch edge and lift gently. If the top hinge shifts, tighten every screw on both leaves. A surprising number of doors are fixed right here in two minutes, which makes it the most satisfying repair in the house.
A screw that spins without biting has chewed out its hole. The classic fix is to pack the hole with wooden toothpicks or a golf tee dipped in wood glue, let it dry, snap it off flush and drive the screw back in. It works well on a light interior door. On a heavy exterior door, go longer instead.
The short screws that come with most hinges only grab the jamb, a board with a shim gap and the wall framing behind it. Door makers fix sag by reaching past it. Therma-Tru's installation instructions call for #10 x 2-1/2 in. screws through the top hinge into the stud to anchor the frame and prevent sagging, and fasten the jambs with 2-1/2 or 3 in. exterior screws. Its troubleshooting guide sends a door sagging out of square straight back to those long top-hinge screws.
Swap one screw at a time on the top hinge, in the holes closest to the weatherstrip, as Therma-Tru specifies. Drill a pilot hole, drive the screw until it's snug, and watch the latch side lift as the top hinge pulls in. Stop there; overdriving pulls the jamb out of line.
If the hinges are tight and the latch still misses by a millimetre or two, file the edge of the strike opening with a metal file until the bolt drops in, and chisel the wood pocket behind it deeper if the bolt bottoms out. If it misses by more, move the strike: unscrew it, plug the old holes, chisel the recess so the plate sits flush, and fasten it with long screws. Therma-Tru secures its strike plates with 2-1/2 in. screws through the jamb, for security as much as alignment.
Doors get painted, and latches get painted with them. A bolt half glued by old paint, or a strike opening narrowed by three coats of semi-gloss, drags every time. Scrape the paint off the bolt, the faceplate edges and the strike, wipe away the grime, and work the knob a dozen times. If it still drags after that, the trouble is inside the latch.
A clean bolt that's still lazy has a tired spring or a broken part inside, which is common on latches that have done twenty years of daily duty. On most interior doors a tubular latch swaps out with two screws once you've matched the backset, the distance from the door edge to the centre of the knob hole. Older mortise latches, with the lock case buried in the door edge, are fussier and often worth handing to a locksmith.
Wood trades moisture with the air all year. The USDA Forest Products Laboratory's Wood Handbook says wood in service is always changing moisture content, that seasonal swings matter more than daily ones, and that coatings slow those changes without preventing them. Its table of outdoor equilibrium moisture content covers only US cities, but Seattle, the closest one to White Rock, runs from 12.0 percent in July to 16.9 percent in December. A door that closed sweetly in August can rub by November.
That's why an old cottage door near the water can stick all winter and free itself by summer. Tighten the hinges and wait for a dry spell before planing anything. If it does need planing, that's carpentry, and the fresh wood needs sealing the same day: Masonite's interior door warranty requires all six edges sealed with at least two coats of paint, varnish or lacquer, notes that primer alone isn't a sealer, and caps width trimming at 1/8 in. per side. If the door carries a fire rating, as many condo suite doors do, don't plane it at all; Masonite's warranty rules out trimming a rated door unless the fire door standards expressly allow it, and then only under the rating agency's label service.
Fresh, thick weatherstrip is springy, and a door that latched fine yesterday now bounces off it. Give foam or bulb seal a week or two to compress. If it still fights, move the strike a hair away from the doorstop so the bolt catches with the seal squeezed; Therma-Tru's instructions have you adjust the strike in or out for proper weatherstrip contact. Don't overdo it, though. Its troubleshooting guide treats a door that rattles in and out when latched as a strike that needs a tighter fit.
Hold a long straightedge or a taut string corner to corner across the door. A warped door touches the stop at one corner before the latch arrives, so the latch side stands proud. Some warp is allowed: Masonite's interior door warranty treats up to 1/4 in. across the face of a standard-size door as within tolerance, and may wait up to 12 months on a warp claim to let the door adjust to local humidity. A slight warp can often be handled at the strike or by moving the stop moulding; a badly twisted slab needs replacing, which is carpentry.
Interior doors are light, often hollow-core, and hung on a simple passage latch. The usual culprits are loose hinge screws, a painted latch and a bathroom door that swells after long hot showers. The stakes are low: an unlatched bedroom door is annoying, not dangerous.
Exterior doors are heavier, face the weather and carry a deadbolt as well as the latch. When the latch stops catching, the deadbolt usually stops throwing fully too, and a deadbolt you have to lift the door to turn is a security problem, not just a nuisance. Exterior doors also take the weather directly, so check both bolts once the autumn rain settles in. Condo suite doors are heavy and often fire-rated, so shaving them down is off the table and the fix has to happen at the hinges or the strike.
The line is fairly clean. Locksmith work: hinges pulled back true with long screws, strikes filed, moved or replaced with a deeper box strike, stuck or broken latches, and deadbolts that no longer throw fully. Carpentry: planing and sealing a swollen door, moving door stops, rehanging or replacing a warped slab, and rotten or split framing. Older wood-frame houses around Crescent Beach and Ocean Park can need a bit of both, since a sagging hinge and a swollen edge like to arrive together in the wet months.
Typical Metro Vancouver ranges for a mobile visit run $80 to $150 for hinge work and door realignment, $75 to $140 for strike relocation or a box strike upgrade, and $160 to $380 for handle set and latch replacement. Several doors on one visit, old mortise hardware, seized screws and parts that have to be ordered push a job up its range, and carpentry is quoted separately by the carpenter. Door repair and residential locksmith work cover the hardware side, and if an exterior lock is being replaced anyway, it's a sensible moment to rekey the others to the same key.
| Symptom | Likely cause | Try first | Who to call if that fails |
|---|---|---|---|
| Latch lands below the strike opening | Loose or stripped top hinge; door sagging | Tighten, then 2-1/2 to 3 in. screws into the framing | Locksmith |
| Latch lands above the strike opening | Loose bottom hinge or a shifted frame | Tighten the hinges, then file or move the strike | Locksmith |
| Only latches when slammed | Bolt catching the lip of the strike | File the opening or move the strike slightly | Locksmith |
| Won't close after new weatherstrip | Seal too thick or not yet compressed | Wait a week or two, then adjust the strike | Locksmith |
| Stops latching in wet weather | Door or frame swelling | Tighten the hinges and wait for a dry spell | Carpenter, if it has to be planed and sealed |
| Bolt sticks or won't spring out | Paint and grime, or a worn spring | Scrape and clean the bolt and strike | Locksmith, to replace the latch |
| Door meets the stop at one corner | Warped slab | Check with a straightedge or string | Carpenter |
The slam squeezes the weatherstrip or a swollen edge just long enough for the bolt to drop in, which means the bolt is landing on the lip of the strike instead of in the opening. Tighten the hinges first, then file the strike opening or move the strike a hair away from the doorstop so a gentle push is enough.
Wood takes on moisture in wet weather and swells, and the Wood Handbook notes that paint slows that exchange without stopping it. Unsealed edges, like a bottom edge planed years ago and never painted, are why door makers insist on sealing all six. If it latches again in dry weather, seal the edges and fine-tune the strike; if it binds every winter, it needs planing.
Usually not. If the bolt springs out cleanly when you press it and let go, the knob isn't the problem, and a new one will miss the strike exactly like the old one. Replace the latch when the bolt sticks, won't retract when you turn the knob, or the knob spins on a broken spindle.
Yes, for most causes: loose or stripped hinges, long screws into the framing, strike plates, box strikes, stuck or broken latches and deadbolts that no longer throw. A door that has to be planed, rehung or replaced is carpentry, and a good locksmith will say so before quoting.
Fast Locksmith White Rock handles the locksmith side of a door that won't latch across White Rock and South Surrey: hinges pulled back true with long screws into the framing, strikes reset or replaced, and tired latches swapped, with a straight answer when the door needs a carpenter instead. Call 778.370.5594 or book online and describe where the chalk mark landed; that one detail usually tells the technician what to bring.
More on doors, latches and locks around White Rock.