A door that sticks was once fine and now isn't. Something changed — the humidity, the hinge screws, the frame, the house settling. The fix is almost always small, but figuring out which small thing takes a few minutes of poking at it. Most of the time you don't need a new door; you need to find the actual cause and fix only that.
Watch the door before you touch it
Open and close it slowly, watching the whole frame, not just the point of contact. Where does it bind — top corner, side, floor? At a certain angle, or all the way through the swing? The location tells you which of three things is wrong: the door swelled, the hinges loosened, or the frame shifted. Each fixes differently.
A door that sticks at the top corner in summer and is fine in winter has humidity swell. One that sticks year-round has a structural issue. One that suddenly started after a year of being fine probably has a loose hinge screw. The door tells you which; you just have to watch.
Humidity swell, the usual suspect
Wooden doors drink moisture from summer air and give it back in winter. A door that fits perfectly in January may swell 1–2mm by July, and that's enough to bind. The fix isn't to plane it — come winter it shrinks and the gap's back. Manage the humidity in the room instead.
A dehumidifier in the humid months, or just better ventilation, brings it back into spec without touching the door. If there's a bathroom or kitchen on the other side, a quiet extractor fan running during showers or cooking does most of the work.
Loose hinge screws, the easy fix
A door hangs on maybe six screws across two or three hinges. If even one works loose, the whole weight shifts to the rest and the door drops a millimetre or two — enough to bind at the top corner. Tighten them. If a screw won't tighten, fill the hole with a wooden toothpick dipped in wood glue, let it dry, re-drive the screw.
Don't just swap the stripped screw for a longer one of the same diameter — that longer screw strips the deeper hole eventually too. Use a wooden plug, or step up one gauge (say #8 to #10). The step-up gives the new screw fresh wood to bite.
The frame has shifted
Houses settle. The frame that was square when built may not be now. The fix is to relocate one hinge — a small adjustment that carries the door through the frame's new geometry. That's a job for a small rotary tool, a square, and a little patience.
The trick is to deepen one hinge mortise by 1–2mm on one side. That shifts the hanging point by 1–2mm, usually enough to clear the bind. Don't deepen both hinges of a pair; deepen one side of one, and check the swing before doing more.
The door has warped
Solid wood can warp if it's seen uneven humidity — a heater on one side, a cold wall on the other. A warped door is harder than a swollen one. Usually you plane the high side of the warp, in small passes, checking the swing each time. Take off less than you think; a planed door can't be un-planed.
Hollow-core doors are cheaper to replace than repair — the cardboard honeycomb inside doesn't take a plane well. A warped hollow-core is usually at the end of its life, and a new one costs less than the time you'd spend fixing the old.
Other furniture sins
A drawer that sticks is usually one of three things: dirty slides, worn slides, or overloaded and sagging at the bottom. First is a five-minute vacuum-and-brush fix. Second is a parts swap. Third is a "stop putting that in there" conversation with yourself.
A cabinet door that won't stay shut is usually a loose catch or magnetic strip. The catch is a small bit of hardware on the frame; tightening its screws fixes it nine times out of ten. The strip is held by a small clip; bend the clip and the strip pops out every time you open the door firmly.
The 30-second diagnosis
Hold a thin strip of paper between the door and frame at the contact point. Close the door slowly. If the paper pulls free, the contact is light — it's binding somewhere else. If the paper tears, the contact is too tight; that's your fix point. The paper is the cheapest diagnostic tool in the house, and it works on every door and drawer in it.
Once you've found the contact point, mark it with a pencil. Photo it so you can still see it after you've moved on to other fixes. That mark is the difference between a 30-minute fix and a three-hour wander.
When the door is fine and the floor isn't
A door dragging on the floor is rarely a door problem; it's a floor that lifted — usually a board swollen at the edge, or a bit of concrete that heaved. Two or three millimetres is enough to drag a door that was clearing it. Fix the floor, not the door.
A lifted wood floor usually re-secures with a finish nail or trim screw, then sand the high point flush. A heaved concrete floor is more serious and may want a pro. Either way, the door isn't the problem.
The kit that handles most of it
A 61-piece rotary kit covers hinge mortising, screw-hole repair, light planing, small sanding. The same kit does a hundred other little fixes — a stuck window, a loose cabinet handle, a stripped screw hole in a chair. Buy it for the house, not the workshop; it lives in a drawer and gets used twice a month.
The second tool is a caliper, even a small 6in one. It tells you exactly how much to plane, how deep to cut a mortise, how much the door swelled — turns the guess into a number. For the rotary work I use the 80-piece HARDELL advanced set; pair it with a small caliper and the two handle every door in the house.
When to stop and call someone
If the frame itself is cracked, or the wall around it is, that's structural, not a DIY job. A frame pulling away from the wall means something above is moving — settling foundation, a beam that lost support. Those aren't door problems; they're house problems and need a builder's eye.
Honest test: if you can fix it in an afternoon with tools you have, do it. If you're about to pull the frame, replace structural wood, or touch the wall — stop. An hour of builder costs less than a mistake that makes it worse. The 80-piece HARDELL system with a 6in caliper covers the jobs you can do; leave the rest to the pro.
One last thing — a 6in caliper with an LCD gives you a digital read on the gap between door and frame, so you're not squinting at pencil marks or guessing by feel.
