Most sticking doors are loose hinges, not a bad door. Start with the easy fix.
Doors usually stick because hinge screws loosen over time and the door sags toward the latch side. Difficulty: Level 1: First Wins. Plan on 10 to 45 min.
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Open the door and tighten every hinge screw, on both the door and the frame. The top hinge matters most.
If a screw just spins, the hole is stripped. Replace one screw in the top hinge's frame side with a 3-inch screw. It reaches the framing and pulls the door up and back into place.
Close the door and check the gap along the top and latch side.
If tightened hinges don't solve it, the door or frame has swollen or shifted, and a little wood needs to come off where it rubs. Difficulty: Level 1: First Wins. Plan on 10 to 45 min.
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Close the door on a piece of chalk or mark where it rubs. Look for the shiny or worn spot.
Take the door off by tapping the hinge pins up and out.
Plane or sand the marked area a little at a time, checking the fit as you go.
Seal the bare wood with primer or paint so it doesn't swell again in humid weather.
New flooring, thick rugs and raised thresholds take away the gap a door needs to swing freely. Difficulty: Level 1: First Wins. Plan on 10 to 45 min.
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If it's a rug, move it or choose a thinner one.
If it's new flooring, the door needs trimming. Remove it, mark the cut line, and trim with a plane for small amounts. A larger trim is a saw job for a confident DIYer or a carpenter.
Seal the cut edge before rehanging.
A latch misses when the door sags or the strike plate sits a little high or low. Difficulty: Level 1: First Wins. Plan on 10 to 45 min.
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Tighten the hinge screws first. Sagging hinges are the most common reason a latch misses.
Rub lipstick or a marker on the latch, close the door, and see where it hits the strike plate.
If it's a little off, file the strike plate opening. If it's well off, move the strike plate to line up.
Several doors sticking at once along with new cracks in walls or ceilings can mean the house is settling or the foundation is moving.
Planing doors won't fix that. Have a contractor or structural engineer look at it first.