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Doors and windows stick or don't close properly due to swelling, settlement, or misalignment. Simple adjustments—planing edges, using shims, adjusting latches—fix most problems. Understanding the cause prevents recurrence.
Operate a sticky door or window carefully, noting exactly where it binds (top, bottom, or side). Try loosening or tightening hinges incrementally. Test whether the problem worsens with humidity. Experiment with adjusting or replacing weatherstripping.
Doors and windows are precision fits: they are cut and hung to match a specific frame opening, with just enough clearance to swing or slide freely while still sealing against drafts. This fit is never perfectly stable. Houses settle over years as foundations compress and framing lumber dries out; seasonal humidity makes wood swell in summer and shrink in winter; paint buildup gradually fills the clearance gap over decades. When a door starts sticking or a window stops latching, one of these forces has disturbed the fit — and diagnosing which one points you toward the right fix.
The first diagnostic step is to find the exact point of contact. Open the door and watch the top edge, side edges, and latch as you slowly close it. Where it binds first is where it's touching the frame. A mark left by the binding — a paint scrape, a shiny rub spot, a compressed weatherstrip — is your evidence. A door that drags only in summer and works fine in winter almost certainly swells from humidity; the wood is absorbing moisture and expanding. A door that has always been slightly tight all year probably has settled hinges or accumulated paint. Diagnosing before acting prevents the mistake of planing down the wrong edge.
For doors, the three most common fixes correspond to the three most common causes. If hinges are loose, tighten or replace the screws — a sagging door binds at the top latch side because the weight of the door is pulling it downward and inward. If paint is the problem, remove the door and plane or sand the binding edge lightly. If the frame itself has racked out of square from settlement, a shim placed behind one hinge can cant the door back into alignment. For humidity-related swelling, the most durable fix is sealing the door edges with paint or finish, which slows moisture absorption and keeps the wood more dimensionally stable year-round.
Windows follow the same diagnostic logic but have a different mechanical vocabulary. Double-hung windows have sashes (the movable panels) that slide in channels — if the channels are painted shut, a utility knife scored along the seam and gentle tapping with a rubber mallet frees them. If the sash is warped or swollen, it may need planing on the sides. Casement windows (the crank-out type) can have cranks that slip or hinges that sag. In all cases, the goal is restoring the original intended fit: enough clearance to move freely, enough contact to seal. Most sticking problems are solved in under an hour with basic tools — replacement is rarely warranted for a door or window that simply needs its geometry restored.