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If your door suddenly starts sticking, scraping, or refusing to close all the way, you’re probably dealing with a swollen door. This is one of the most common household issues in Australia — especially during humid months or after heavy rain. When timber absorbs moisture, it expands slightly, causing the door to jam against the frame or floor.
The good news? You don’t have to force it shut or replace the whole thing. With a few simple checks and fixes, you can usually get your door closing smoothly again. Here’s how to find the cause of the problem and the best ways to fix it.
How to Fix a Swollen Door That Won’t Close Properly
1. Identify Where the Door Is Sticking
Before you reach for the tools, you’ll need to pinpoint exactly where the swelling is causing the problem.
How to check:
- Open and close the door slowly while observing where it rubs or catches.
- Look for scuff marks on the edge of the door or the frame — this will tell you which part is swollen.
- In some cases, you might hear a creaking or scraping sound when you push or pull the door.
Tip: If you’re not sure, slip a piece of paper between the door and frame. Wherever the paper gets stuck, that’s where the swelling is most noticeable.
2. Reduce Moisture Around the Door
Swelling happens when timber absorbs excess moisture. Tackling the root cause — humidity — will help the door dry out naturally.
How to fix:
- Improve ventilation: Keep windows open when possible or use an exhaust fan in nearby rooms like the bathroom or laundry.
- Use a dehumidifier: Running a dehumidifier near the swollen door can help pull moisture out of the air and speed up drying.
- Check for leaks: Inspect nearby windows, walls, or roofs for any water ingress. A slow leak could be introducing constant moisture into the area.
Tip: If the door is in an exterior entryway, make sure the weatherstripping and seals are intact to prevent rain from seeping in.
3. Tighten or Adjust the Hinges
Sometimes, a swollen door isn’t the only issue — loose hinges can also cause it to sag, making the alignment worse.
How to check:
- Look at the hinge screws on both the door and frame.
- If they’re loose, the door may hang slightly off-centre, rubbing against the swollen section of the frame.
How to fix:
- Use a screwdriver to tighten all hinge screws securely.
- If a screw won’t tighten because the hole is stripped, fill it with wooden toothpicks dipped in glue, let it dry, then screw it back in.
- For heavier doors, you can also install longer screws that reach deeper into the door frame for better support.
4. Sand Down the Swollen Area
If the swelling hasn’t gone away after drying, you may need to lightly sand down the affected area to restore clearance.
How to fix:
- Remove the door from its hinges and lay it flat on a stable surface.
- Use medium-grit sandpaper (around 120-grit) to sand the areas where it was sticking.
- Test-fit the door after a few passes. Sand gradually — taking off too much can leave an uneven gap.
- Once it fits smoothly, switch to fine-grit sandpaper for a clean finish.
Tip: Don’t forget to reseal or repaint the sanded area afterward. Unsealed wood will quickly absorb moisture again and swell back up.
5. Seal and Paint the Door Properly
Prevention is key when it comes to swelling. If your door isn’t properly sealed or painted — especially around the top and bottom edges — moisture can easily get in and cause future problems.
How to fix:
- Apply a quality primer to all raw timber surfaces, followed by two coats of paint or varnish.
- Pay special attention to the top, bottom, and hinge edges — these spots often get overlooked during painting but are the most exposed to humidity.
- If the door faces outdoors, use a weather-resistant sealant or paint designed for exterior use.
Tip: It’s best to reapply sealant or paint every couple of years to maintain protection, especially if your area experiences high humidity or frequent rain.
6. Adjust the Door Frame or Strike Plate
If your door still won’t close smoothly after sanding, the issue might lie in the frame or the latch alignment.
How to check:
- Try closing the door gently and watch how the latch enters the strike plate.
- If it doesn’t line up or scrapes against the plate, it may need repositioning.
How to fix:
- Loosen the screws on the strike plate and move it slightly up, down, or sideways to match the latch’s position.
- If needed, fill the old screw holes with wooden filler or toothpicks before reattaching it.
- You can also slightly file the edges of the strike plate hole to give the latch more clearance.
7. Use a Heat Source for Quick Drying
If your door only swelled recently — perhaps after a few wet days — you can try speeding up the drying process.
How to fix:
- Use a hair dryer or heat gun set to low heat and aim it at the swollen area. Keep it moving to avoid scorching the paint or wood.
- Alternatively, direct warm air from a fan heater nearby for several hours.
- Once the door dries out, it should return to its normal size and fit properly again.
Note: Avoid applying heat too close or for too long, as this can crack paint or warp the wood further.
8. Check for Frame or Structural Issues
Sometimes, the problem isn’t just the door — the frame itself may have shifted due to moisture, house movement, or age.
How to check:
- Examine the door frame for gaps, cracks, or signs of separation from the wall.
- If you notice movement or warping in the frame, professional repair might be necessary.
How to fix:
- For minor frame movement, tightening screws or re-caulking gaps might help.
- For major warping, you’ll likely need a carpenter or locksmith to realign or replace the frame section.
Know When to Call a Locksmith or Carpenter
If you’ve tried all the DIY fixes and your door still won’t close properly, it’s time to get professional help. A locksmith or carpenter can quickly assess whether the problem is with the door’s structure, hinges, or lock alignment.
A professional can also reseat the door perfectly in its frame and make sure the latch and lock work smoothly — saving you from the frustration of forcing the door shut every day.
Final Thoughts
A swollen door can be a real nuisance, especially when it happens suddenly after a spell of humid weather. But with a bit of patience and the right approach, you can often fix it yourself without calling in a tradesperson. Start with drying and tightening, then move on to sanding or sealing if needed.
If it keeps happening or you’re worried about damaging the door, don’t hesitate to get expert help. A qualified locksmith or carpenter can fix the alignment, reseal the edges, and make sure your door opens and closes perfectly again — no more slamming, scraping, or forcing it shut.
