Every July it’s the same story: the bathroom door that swung fine in April now scrapes the floor like it owes you money, and the hall closet door needs a shoulder check to close all the way. Nothing’s broken. Your doors are just doing what wood does — swelling with humidity. The wood absorbs moisture from the air, expands, and suddenly a door that had a tidy quarter-inch gap is fighting the frame for space.
First, Figure Out If It’s Actually the Wood
Before you grab a planer and start shaving things down, rule out the easy stuff. Check the hinges — a loose screw lets the door sag and drag on one corner, which can look exactly like swelling. Tighten them, or if the screw holes are stripped, swap in longer screws that bite into the framing stud behind the jamb. Also check whether the door was sticking before summer even started. If it’s a new problem that showed up with the humidity, it’s almost certainly moisture. If it’s been sticking for a year, that’s probably a settling or installation issue that humidity is just making worse.
Don’t Reach for the Planer Yet
This is the part people mess up. It’s tempting to plane down a swollen door in July, but wood shrinks back in winter when the air dries out and the heat kicks on. Plane it now to fix a summer problem, and by January you’ll have a door with a visible gap at the top or side, letting drafts through and looking sloppy. Unless the sticking is severe — like you genuinely cannot close the door — hold off on permanent trimming until you’ve lived with it through at least one full humidity cycle.
What Actually Helps Right Now
- Find the exact contact point. Slide a piece of paper along the door frame while closing it slowly. Where it catches, mark it lightly with a pencil.
- Sand, don’t shave. A sanding block or 100-grit paper on the marked edge is usually enough for minor swelling. You’re looking to remove maybe 1/16 of an inch, not reshape the door.
- Check the strike plate. Sometimes the fix isn’t the door at all — moving the strike plate on the frame by a hair can solve the whole problem without touching the door itself.
- Run a dehumidifier in problem rooms. Basements and bathrooms are usually the worst offenders. Getting indoor humidity down to 40–50% often reduces sticking enough that you don’t need to touch the door at all.
If You Do Need to Plane
If the door is truly unusable — won’t latch, won’t fully close — go ahead, but do it carefully. Remove the door from its hinges and work on a flat surface. Plane the latch side rather than the hinge side whenever possible; it’s much easier to rehang without throwing off the alignment. Take thin passes and test-fit constantly. Seal the freshly planed edge with primer or a coat of paint or varnish afterward — bare wood on an exposed edge just soaks up more moisture next summer and you’ll be right back here.
The Long-Term Fix Nobody Wants to Hear
If this happens every single year with the same door, the real fix is controlling the environment, not the wood. That means checking for a bathroom fan that isn’t venting outside (a shockingly common issue), making sure your AC is actually dehumidifying and not just cooling, and looking at whether that door is near an exterior wall with poor sealing that’s letting humid air pour in around it. Solid wood doors are especially prone to this; if you’re renovating anyway, a solid-core composite door holds its shape far better across seasons and might save you this whole annual ritual.
Small satisfaction here: once you find the actual sticking point and sand it just enough, that door will close with a soft, satisfying click for the rest of the summer. Worth the ten minutes.
