How to Fix a Sagging Door

A sagging door is a sign of wear that’s usually easy to fix yourself. With a few basic tools and simple adjustments, you’ll restore smooth movement, improve security, and prevent long-term damage. This how-to guide walks you through nine easy steps to fix a sagging door.

1. Tighten the Hinge Screws

Loose hinge screws are the most common cause of a sagging door. Even one slightly loose screw will shift the weight and cause sagging and rubbing against the frame.

1. Use a screwdriver to tighten each screw on both the jamb and door side until snug.
2. Don't over-tighten, as that will potentially strip the wood or damage the hinge.
3. Check if the door now closes and latches easily.

A few quick turns of a screwdriver often restore proper alignment instantly.

2. Replace Worn or Short Screws

If tightening didn't help, the existing screws are probably too short or worn out. Short screws loosen faster, allowing the hinge to pull away from the door jamb.

1. Replace the screws with 2½- or 3-inch coarse-thread wood screws that reach the wall stud for a stronger hold.
2. Make sure the screw heads match the hinge holes so they sit flush and don't interfere with the door movement.
3. Start with the top hinge, since it carries most of the door’s weight.

Using longer screws with coarser threads will provide deeper support and lift the door back into position without further repair.

3. Repair Stripped Screw Holes

Stripped screw holes prevent screws from tightening and weaken the hinge’s grip, which leads to sagging.

1. Remove the loose screw and fill the hole with wooden toothpicks or a short dowel dipped in wood glue.
2. Let it dry completely before driving the screw back in.
3. For a stronger hold, use a longer coarse-thread screw as described in Step 2.

This easy fix gives the screw new wood to bite into and restores a firm hold on the frame.

4. Check for Damaged Hinges

Bent, rusty, or loose door hinges will throw the door’s weight off balance and cause it to drop.

1. Inspect each hinge leaf and pin for signs of wear or damage.
2. Replace any rusted or warped parts with new plain hinges or pins.
3. If only the hinge pins are worn, tap the new ones gently into place with a hammer until they sit flush.
4. Lubricate the moving parts with a light coat of silicone spray or household oil.

Pro Tip: When replacing old hinges, consider upgrading to concealed hinges. They distribute weight more evenly, resist dust and corrosion, and help prevent future sagging while giving your door a cleaner, modern look.

5. Remove Paint or Debris Behind Hinges

Even a thin layer of paint or debris will affect hinge alignment. Cleaning this area ensures hinges sit tight and true.

1. Remove the hinge from the door and jamb.
2. Use a putty knife or wood chisel to scrape away dried paint or residue.
3. Wipe the surface clean and reinstall the hinge snugly, then test the door.

6. Adjust the Hinge Placement

If your hinges are in good shape but the door is still sagging, the next step is adjusting the hinge placement.

1. Support the door’s weight while loosening the screws slightly.
2. Move the hinge plate only a few millimeters, then re-tighten.
3. Use a level or straight edge to check that the top gap is even across the frame.
4. Test the door swing to confirm smooth, even closure.

These micro-adjustments often restore alignment without buying new parts.

Tip: A slight hinge bend is sometimes a temporary fix for metal or heavy doors, but do this carefully to avoid breaking the hinge or worsening the alignment.

7. Inspect the Door Frame and Jamb

Settling foundations or uneven floors will tilt the jamb just enough to throw the door off-square and make it sag.

1. Check for cracks or gaps where the frame meets the wall.
2. Use a level along the top and sides to confirm the jamb is square.
3. Watch for uneven spacing or rubbing as the door closes.

If the frame isn’t square, note which side is off to help you determine where to adjust the hinges or add shims.

8. Add Shims If Needed

Shimming changes hinge depth so the door sits square within the frame.

1. Support the door’s weight and loosen the hinge screws slightly.
2. Insert a thin wood or cardboard shim behind the hinge plate on the jamb side.
3. Tighten the screws and test the door’s swing.

Tip: Use thin shims and test as you go. Too much spacing pushes the door out in the opposite direction, causing more problems. Smaller shims make finer adjustments and reduce the risk of overcorrecting.

9. You’ve Fixed the Sag—But the Door Still Won’t Close

If the door no longer sags, but still won’t latch or close smoothly, try one of these final fixes.

Realign the Strike Plate

If the latch doesn't catch, adjust the strike plate. For detailed, step-by-step instructions on realigning the strike plate, see How to Fix a Door That Won't Close.

Sand the Door Edges

A sticking door is a common door problem that light sanding usually solves.

1. Close the door and mark where it rubs against the frame.
2. Sand those areas lightly with fine-grit sandpaper.
3. Recheck the fit after each pass until it swings smoothly.
4. Steal the sanded edges with paint or varnish to protect against moisture.

These final adjustments usually restore smooth, complete closure.

What Causes a Door to Sag

Doors start to sag when the frame, hinges, or door itself shifts under normal use. Finding the main cause helps you fix it correctly without too much guessing.

• Structural Movement: Foundation movement will throw door frames out of alignment.
• Door Weight: Heavy doors pull the hinges downward.
• Material Changes: Wood expands and contracts with changes in humidity.
• Repeated Use: High-traffic doors wear out hinges faster.
• Hidden Gaps: Uneven subfloors or poorly fitted jambs create stress points that push the door off square.

When to Call a Professional

If you've tightened, shimmed, and sanded but the door still won't align, it's time to call a professional.

Call a pro when:

• The frame is cracked, warped, or pulling from the wall
• The floor beneath the door is uneven or settling
• Even long hinge screws no longer grip the wood
• Gaps or uneven spacing return after adjustment

A licensed door specialist will re-square the frame or reset the jamb without damaging trim or drywall. This ensures your door operates smoothly and prevents future sagging.

FAQs

Q: What tools and materials do I need to fix a sagging door?

To fix a sagging door, you’ll need a screwdriver, hammer, chisel or putty knife, level, wood shims, longer hinge screws, toothpicks or dowels, wood glue, sandpaper, and possibly new hinges.

Q: Will a sagging door damage the frame?

Yes, a sagging door puts uneven stress on the jamb and hinges. Over time, this will warp the frame or strip screw holes, making repairs more complicated.

Q: How long do fixes like shimming or tightening screws last?

Properly installed shims or longer hinge screws will potentially last for many years. However, heavy doors or homes with shifting foundations will need periodic adjustments.

Q: Will a sagging door affect energy efficiency?

Yes, any gaps caused by a sagging door let air escape and raise heating or cooling costs. A square door seals better and improves insulation.

Q: Are certain doors more prone to sagging?

Yes, heavy solid-wood doors, older doors with worn hinges, and doors exposed to humidity or outdoor elements are more likely to sag than lightweight interior doors. Regular hinge maintenance prevents this by keeping the hardware tight and aligned.

Q: How does humidity make my door sag?

Wood doors absorb moisture in humid weather and swell, then contract when conditions dry out. This movement throws hinges out of alignment and causes rubbing or sticking. Sealing doors with varnish or paint helps prevent it.

Q: Will uneven floors cause a door to sag?

Yes, uneven subfloors will make a door hang off-square. This is often corrected with simple hinge adjustments or minor shimming, but severe unevenness typically requires professional repair.

Say Goodbye to Sagging Doors

Sagging doors don’t have to be a permanent problem. By following these nine steps—from tightening and replacing screws to shimming and minor sanding—you will restore smooth, secure operation in minutes.

If the problem persists or the frame is damaged, call a professional to re-square or rehang the door. Regular maintenance and small tune-ups prevent sagging from returning—keeping your doors straight, silent, secure, and long-lasting.