How to Fix a Door That Sticks in Summer

If your door closes perfectly in winter but becomes a battle in summer, you're dealing with seasonal wood swelling — one of the most common door problems in humid climates. Here's exactly why it happens and how to fix it for good.

Why Doors Stick in Summer

Wood is hygroscopic — it absorbs moisture from the air. In summer, higher humidity causes wood fibers to expand. A door that fits perfectly in dry winter conditions can swell by 1/8" or more in humid summer months, causing it to bind against the frame.

This is especially common with: solid wood doors, older homes with wood frames, doors on the north or shaded side of the house, and doors near bathrooms or kitchens.

Step 1: Confirm It's a Humidity Issue

If the sticking started in spring or early summer and the door was fine in winter, humidity swelling is almost certainly the cause. Check if the door sticks more on rainy or humid days — that confirms it.

Step 2: Don't Fix It at Peak Humidity

Wait for a dry day or run a dehumidifier near the door for a few hours before working on it. You want to remove as little material as possible — the door will shrink back somewhat in winter.

Step 3: Identify the Sticking Edge

Mark the contact point with a pencil. Summer sticking usually occurs on the top or latch side of the door where the wood has expanded outward.

Step 4: Plane or Sand the Sticking Edge

Remove material only from the marked area. Work in thin passes and test frequently.

• Amazon Basics Hand Planer No.4 — best for controlled, thin shavings on door edges
• DEWALT 5-Inch Orbital Sander — faster removal on flat surfaces
• Sanding Sponge 8-Pack — for finishing and tight spots

Step 5: Seal All Exposed Wood

This is the most important step that most people skip. After planing, the bare wood edge will absorb moisture even faster. Seal it immediately with primer and paint or a wood sealer. This dramatically reduces future swelling.

Step 6: Reduce Indoor Humidity

Long-term prevention means controlling moisture levels. Use a dehumidifier in summer, ensure good ventilation, and fix any leaks near the door.

Pro Tip: How Much to Remove

Remove only enough material so the door closes with light resistance on a humid day. It should close freely on a dry day. If you remove too much, you'll have gaps in winter.

When the Problem Is Structural

If the door sticks year-round and not just in summer, the issue may be loose hinges, a settled frame, or a warped door — not humidity. See our guide on How to Fix a Door That Sticks for those solutions.