How to Fix a Sagging Door: 5 Proven Methods

A door that scrapes the floor or refuses to latch is more than an annoyance. Left alone, a sagging door wears a groove in your flooring, strains the frame, and eventually stops closing at all.

The good news is that most sags trace back to a few loose hinge screws, not a warped slab, so the cheapest fix is usually the right one. Nine times out of ten you can square up a stuck door in under an hour with a drill and a handful of longer screws.

Below we walk through five methods, ordered from the easiest hardware tweak to a last-resort planing, so you start with the fix most likely to work.

What Causes a Sagging Door?

Houses move. As your home settles, the frame shifts out of square, and the door no longer fits the opening the way it did when it was hung. This happens in brand-new builds and century-old houses alike.

Weight makes it worse. A solid-core door weighs roughly 40 to 60 pounds, while a hollow-core interior door is only 15 to 25 pounds, so the heavier slab puts far more load on its hinges. Give it enough years and the top hinge starts pulling away from the jamb.

Here are the specific reasons your door drags:

• Loose Screws: Screws stripping out of the jamb are the number one cause of a dropped door.
• Worn Hinges: Metal wears down after years of friction, letting the hinge leaves separate and the door sink.
• Bent Pins: Heavy use can bend a hinge pin, opening a gap that lets the door sag.
• Paint Buildup: Too many layers of paint between the hinge and the jamb push the door out of alignment.
• Seasonal Swelling: Wood soaks up moisture from humid summer air and expands, so a door can bind in July and swing freely once winter dries it out.
• Bad Install: A previous owner may have used cardboard shims that slowly compressed.

How to Fix a Sagging Door

Stop shaking your fist at the door. It’s time to fix it. We have arranged these methods from easiest to hardest. Start with the screws before you try taking the door off the hinges.

First, gather the right tools.

What You’ll Need

• Power drill with driver bits.
• Screwdriver.
• Utility knife.
• Hammer and nail set (or large nail).
• Scrap wood block.
• Sander or hand planer.
• Cardboard (cereal box thickness).
• Carpenter’s square.
• Adjustable wrench.
• Finish nails.
• Pencil.
• Masking tape.
• 3-inch wood screws.
• Wood shims.
• Sawhorses (optional).

Method 1: Tighten and Replace Hinge Screws

This fixes 90% of sagging doors. The top hinge carries the most weight, so the screws there are usually the first to fail.

1. Hand Tighten First

Grab a manual screwdriver. Check the top hinge on both the door side and the jamb side. If they spin without tightening, the wood is stripped. If they turn and tighten, you might have solved the problem already.

2. The 3-Inch Screw Trick

Standard hinge screws are only about an inch long. They only bite into the door jamb (the trim), not the structural stud behind it.

1. Remove the center screw from the top hinge on the jamb side.
2. Replace it with a 3-inch wood screw.
3. Drive it in with your drill.

The long screw passes through the jamb and anchors deep into the 2×4 wall stud. This pulls the whole frame tight and lifts the door. If you see a gap behind the hinge, slip a thin shim in first, otherwise the screw can pull the jamb past plumb and bind the door on the latch side.

3. Fix Stripped Holes

If the screws spin and won’t bite, fix the hole. Dip a wooden toothpick or matchstick in wood glue. Jam it into the screw hole and break it off. Now, drive the screw back in. The wood filler gives the threads something to grab.

Method 2: Shim the Hinges

If tightening screws didn’t work, try shimming the hinge. This technique pushes the hinge leaf out slightly, which changes the angle of the door.

1. Identify the Gap

Close the door. Look at the gap between the door and the frame on the latch side (the handle side).

• Rubbing at the top? You need to shim the bottom hinge.
• Rubbing at the bottom? You need to shim the top hinge.

2. Cut a Spacer

Cut a piece of thin cardboard (like a cereal box) or playing card to fit behind the hinge.

3. Loosen the Hinge

You don’t need to remove the door. Just loosen the hinge screws on the jamb side enough to slide your cardboard spacer behind the hinge leaf.

4. Tighten and Test

Tighten the screws back down. This pushes the hinge out a tiny fraction of an inch, which lifts the opposite side of the door significantly. Close the door to check the fit. Add more cardboard layers if necessary.

Method 3: Bend the Hinge Knuckles

This is a pro tip that saves you from removing the door. If the hinge gap is too wide, the door sags. You can bend the hinge knuckles to close that gap.

1. Remove the Pin

Close the door. Use a hammer and nail to tap the hinge pin out of the top hinge roughly halfway.

2. Bend the Knuckle

Use an adjustable wrench. Clamp it onto the knuckles of the door-side hinge. Bend them slightly toward the lock side of the door.

3. Re-insert Pin

Tap the pin back in. This tightens the fit between the hinge leaves and pulls the door up and back toward the jamb.

Method 4: Shim the Door Frame

Shimming the actual door frame is a bigger job. You only do this if the frame itself is out of square and the simpler fixes failed.

1. Remove the Trim

Score the paint line with a utility knife to prevent peeling. Gently pry off the interior casing (trim) on the hinge side using a putty knife and pry bar.

2. Check for Square

Use your square to see where the jamb is leaning.

3. Adjust Shims

You will see wooden shims between the jamb and the stud. If the door is sagging, you likely need to drive new shims in at the top hinge location to push the jamb vertical again.

4. Fasten and Re-Trim

Once the door is square, nail the jamb in place through the shims. Cut off the excess shim wood and reinstall your trim.

Method 5: Plane the Door

If you live in an old house with crooked walls, you might just have to cut the door to fit the crooked hole. This is the last resort because you cannot put the wood back once you remove it.

1. Mark the Spot

Close the door until it hits the frame. Use a pencil to mark exactly where it rubs.

2. Scribe the Line

Use a compass or a washer. Run it along the door jamb so the pencil draws a line on the door. This replicates the shape of the jamb onto the door edge.

3. Remove and Sand

Take the door off the hinges. Place it on sawhorses. Use a belt sander or a hand planer to remove wood down to your pencil line.

4. Seal the Edge

Raw wood absorbs moisture, which causes swelling. Apply a coat of varnish or paint to the sanded edge before rehanging the door.

Maintenance Tips to Prevent Sagging

Fixing the door is great, but preventing the sag is better.

Upgrade the Hinges

Hinges are metal, but they aren’t invincible. The knuckles wear down, creating a natural sag. If your door is 20 years old, buy new heavy-duty ball-bearing hinges. They operate smoother and hold more weight than standard builder-grade hinges.

Keep Them Clean

Black dust around your hinges is metal shavings mixed with old oil. Clean this off. It acts like a grinding paste that wears down the pin. Wipe them clean and apply a dry lubricant (like silicone or Teflon). Avoid WD-40, as it attracts dirt.

Check the Jamb Screws

Check the screws annually. If you catch a loose screw early, a quick turn with a screwdriver prevents the door from sagging and warping the frame later.

When to Replace the Door

Sometimes a door is too far gone. If your exterior door swells violently every winter and sticks, planing it won’t help long-term. It will just leave huge gaps in the summer.

If the door is warped (twisted like a potato chip), no amount of hinge adjustment will fix it. In these cases, buying a new pre-hung door is the smartest investment.

FAQs

Do All Doors Sag Over Time?

Almost every door sags eventually, because gravity constantly pulls on the edge opposite the hinges. Heavy solid-core and wide entry doors, at 40 to 60 pounds, drop far sooner than a 15-to-25-pound hollow-core interior door. Keeping the top-hinge screws tight is what slows it down the most.

Do Door Hinges Wear Out?

Yes, door hinges wear out from years of metal-on-metal friction that grinds down the barrel of the knuckle. That wear creates play, or slop, in the hinge and lets the door drop and rub the frame. Swapping tired hinges for new ball-bearing ones is often the simplest lasting fix for a sagging door.

How Can You Tell if a Door Hinge Is Bad?

Open the door and lift up on the handle. If the hinge knuckles move or the whole door shifts, the hinge is worn out. Gray or black dust around the pin is another tell, since it is metal filings from the barrel grinding itself down. A worn top hinge is the usual reason a door starts to sag and miss the latch.

How Do You Fix a Misaligned Door Latch?

Fix a misaligned latch by tightening the top hinge first, because a sagging door drops the latch below the strike-plate hole. Snugging or replacing the top-hinge screws usually lifts the door just enough to line the latch back up. If it still misses, file the strike-plate opening slightly in the direction the latch needs to move.

Will Adding a Third Hinge Fix a Sagging Door?

A third hinge helps prevent future sag by spreading the door’s weight, but it will not straighten a slab that is already bent or badly dropped. Use three hinges as a minimum on any heavy door, and step up to four on a door taller than 80 inches or heavier than 60 pounds.

Can I Use Cardboard to Shim a Door Hinge?

Yes, cardboard from a cereal box or a stiff playing card makes a fine hinge shim for a lightweight interior door. For heavy exterior doors, switch to thin plastic or brass shims, since cardboard compresses under the load and the fix slowly undoes itself.

Why Does My Door Only Stick in Summer?

A door that sticks only in summer is swelling from humidity, not sagging. Wood pulls moisture out of warm, damp air and expands, then shrinks back once the air dries in cooler months. If the rub is minor and seasonal, wait it out or lightly sand the swollen edge rather than planing off wood you will miss come winter.

How Do I Stop a Door From Sticking Without Sanding?

Rub a bar of soap or a plain wax candle along the edge where the door binds, and the waxy film slicks the contact point and stops the drag in seconds. It is only a temporary fix, so use it to buy time while you tighten the hinge screws or run the 3-inch screw trick for a lasting repair.

The Final Word on Sagging Doors

A sagging door is a nuisance, but it is rarely a disaster. Start small and tighten every hinge screw. If that alone does not lift it, run the 3-inch screw trick, then shim the hinge. Most doors never need an expensive repair or a replacement; they just need the hardware brought back into line.

Grab your drill and get that door swinging smoothly again. Odds are the whole job takes less time than you spent listening to it drag.