How To Fix A Sagging Door

A sagging door is one of those small annoyances that somehow feels twice as irritating every time you pass through it. You grab the knob, the bottom edge drags, and you end up pushing harder than you should. If you have been looking up How To Fix A Sagging Door, here is the short version.

Almost every case comes down to one of three causes, and each has a simple fix.

Per International Residential Code guidance, an interior door needs roughly 1/8 to 3/16 inch of clearance on the sides and top. The bottom gap runs about 1/2 inch for most residential settings. When that gap disappears, the door starts scraping, sticking, and refusing to latch.

Most repairs take under 30 minutes and cost less than $10 in materials. Here is how to diagnose yours and fix it for good.

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Quick Answer

Tighten the hinge screws first. If they spin freely, fill the holes with wood glue and toothpicks. Replace short screws with 3 inch screws that reach the frame stud.

For a swollen door, sand or plane the rubbing edge. Always diagnose the cause before touching anything.

Why Your Door Sags and Scrapes

Before reaching for a screwdriver, you need to know what you are up against. Most sagging doors are not the real culprit. The hardware or the frame is.

Swollen wood is a seasonal headache, especially in humid climates. As of 2026, high moisture regions in the Southeast see door binding spike in July and August when relative humidity holds above 70 percent. Wood absorbs moisture, expands, and squeezes against the frame.

Research from university extension programs indicates that a solid wood door can gain up to 1/8 inch across its width during a typical humid summer.

House settling is the quieter culprit. New builds often shift slightly in their first two years. That is enough to throw a jamb out of square.

It shows up as a door that binds at the top or bottom, even when the hinges are perfectly tight. The fastest way to waste an afternoon is to plane a door that only needed longer hinge screws.

Diagnose the Sag: A 60 Second Decision Tree

Here is the fastest way to pinpoint the problem. You need a level, a business card, and your eyes.

Step 1: Check the top gap. Close the door and slide a business card between the door and the jamb at the top. If it will not fit, the door is too tight against the frame. If it slides in easily but the bottom scrapes, the frame is out of square.

Step 2: Wiggle the door. Open it halfway and lift the outer edge. If it moves up and down, the hinge screws are loose or the screw holes are stripped.

Step 3: Inspect the hinge pins. A bent pin shows a visible kink along its length. A rusted pin looks pitted and may creak when the door swings.

Step 4: Trace the rub marks. Paint scuffs on the door edge and frame tell you exactly where the contact happens.

Here is how to read what you found:

This diagnosis sounds obvious, but it is the step most people skip. They grab a plane and shave off a quarter inch before checking whether the top hinge screw is even snug. That is how you end up with a door that no longer seals properly.

Fix #1: Tightening Loose Hinges and Repairing Stripped Screws

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This fix resolves the majority of sagging doors, and it is also the easiest. Start here before doing anything more invasive.

Step 1: Tighten every hinge screw. Use a drill or driver with a #2 Phillips bit. A manual screwdriver works, but you lose leverage and risk chewing up the screw head. If every screw is already tight, skip to step 2.

Step 2: Check for stripped holes. Open the door all the way and pull gently on the hinge. If the jamb screw spins freely in its hole, that hole is stripped. Remove the screw and pack the hole with toothpicks coated in wood glue.

Tap them in snug, let the glue dry, snap them flush, then reinstall the screw. A golf tee works even better for larger holes.

Step 3: Go long. The top hinge carries most of a door's weight. Its screws take the most abuse. Replace the jamb side screws in the top hinge with 3 inch #8 or #9 wood screws.

Those reach past the jamb and bite into the framing stud behind it. This one swap fixes more sagging doors than any other trick.

Pro tip: Never use drywall screws for this. They are too brittle, and their threads are not designed for load bearing joints. Standard wood screws are the only reliable choice.

If the screws hold tight but the door still sags, check the pin. Hinge pins can bend from years of heavy use, especially on exterior doors. Pull the pin with a nail set and hammer.

Then swap it for a matching replacement.

Fix #2: Planing or Sanding a Swollen Door

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If the rub marks are on the door edge itself, the wood has swollen past its original dimensions. The fix is to remove material, not to blame the hinges.

Step 1: Mark the contact points. Close the door and run painter's tape along the edge where scuffs appear. Open and close it a few times. Fresh marks on the tape will show you exactly where to work.

Step 2: Pull the door down. Remove the hinge pins with a pin punch and hammer. Tap from underneath, starting with the bottom pin and working upward. The door will lean toward you, so hold it steady as the pins release.

Step 3: Lay the door flat on sawhorses. Work from the face side so you can clearly see the edge you are shaping.

Step 4: Remove material in thin passes. A block plane works beautifully on solid wood doors. Make your first pass at 1/32 inch max, check the fit, then go again if needed. For hollow core doors, use a sanding block or an electric sander with 80 grit paper.

Then smooth with 120 grit.

Step 5: Rehang and test. Reinstall the pins and close the door. You are aiming for that card thin gap at the top and a clean sweep at the bottom.

One big warning: if you see honeycomb cardboard inside a hollow core door, stop immediately. You have planed through the outer skin. Continuing will only widen the damage.

For fire rated exterior doors, check the manufacturer's spec sheet before removing any material. Most models allow only 1/8 inch of trimming before the rating is compromised.

Fix #3: Adjusting the Frame, Threshold, and Hinge Mortise

Sometimes the hinges are tight, the pins are straight, and the door edge is clean. The problem lives in the frame itself. House settling, moisture swelling, or an original installation that was never quite square can throw a jamb out of plumb by 1/8 inch or more.

That small tilt is enough to make a door drag at the top corner or refuse to latch.

Check the frame with a level first. Place a 4 foot level against the hinge side jamb. If the bubble drifts more than 1/16 inch over the door's height, the frame needs adjustment. The same test applies to the strike side jamb.

Deepen the hinge mortise for a quick fix. If the door binds at the hinge edge, the hinge is sitting too proud of the jamb. Remove the hinge leaf, use a sharp chisel to deepen the mortise by 1/16 inch, and reinstall. This pulls the door closer to the jamb, cleaning up the gap on the latch side.

Shim the hinge for the opposite problem. If the gap at the hinge side is too wide and the door drags on the latch side, place a thin cardboard or plastic shim behind the hinge leaf before reinstalling it. This pushes the door away from the jamb and closes the latch side gap.

Fix the threshold if the door bottom drags. Some older thresholds are adjustable. Look for a set screw or a threaded post under a plastic cap. Turn it clockwise to lower the threshold.

If the threshold is fixed, you can either plane the door bottom or install a thinner door sweep. For exterior doors, a 3/4 inch bottom clearance is typical for drainage and airflow. Interior doors can run a bit tighter, around 1/2 inch.

For a seriously racked frame, reset the jamb. This is the heavy lift. Remove the trim casing, drive shims behind the hinge side jamb until it reads plumb, then nail through the jamb and shims into the rough opening. It takes about an hour per door.

It fixes sagging that nothing else will. But try the other three fixes first. You do not want to pull trim for a problem that three longer screws could have solved.

Common Mistakes That Make Sagging Worse

A few well intentioned moves can turn a 10 minute fix into an expensive replacement. Here are the ones we see most often.

Planing without diagnosing. This is number one by a wide margin. People grab a plane and shave the door edge before checking whether the screws are tight. If the hinge was the issue, you just created a new gap that now lets drafts in.

Always check the hardware before removing wood.

Using drywall screws in hinges. Drywall screws have a brittle shaft and weak threads. They snap under the weight of a door. They strip out of wood faster than a standard wood screw.

Stick with #8 or #9 wood screws for any hinge repair.

Over tightening hinge screws. Cinching a screw past the point of resistance can crack the jamb or strip the hole you just repaired. Snug is enough. If the screw spins freely, you have already stripped it.

Ignoring a bent hinge pin. Tightening screws around a bent pin is like putting new tires on a bent axle. The door will still sag because the hinge itself is deformed. Replace the pin first, then reassess.

Planing a hollow core door without caution. Those doors are a thin wood shell over a cardboard core. One aggressive plane pass can punch through to the hollow space. Once that happens, the door is structurally compromised and usually needs replacement.

Forgetting to check the bottom clearance. You can fix every hinge and plane every edge. If the threshold is too high or the door bottom is too long, the door will still scrape. Measure the gap before and after any adjustment so you do not chase the same problem twice.

Sagging Door FAQs

How much does it cost to fix a sagging door?

Most fixes cost under $10 in materials. A pack of 3 inch #8 wood screws runs about $4. Wood glue and toothpicks cost less than $2 from any hardware store.

A new hinge pin is around $3. If you hire a handyman, expect $75 to $150 minimum for a service call. The DIY route is straightforward for anyone with a screwdriver and a level.

Can I fix a sagging door without taking it off the hinges?

Yes, for the most common fix. Replacing jamb screws with 3 inch screws can be done with the door still hanging. A cordless drill makes this a three minute job.

If you need to plane the edge or adjust the mortise, you will need to pull the door down. Always try the screw swap first.

Why does my door sag more in summer and less in winter?

Wood is hygroscopic. It absorbs and releases moisture with the surrounding air. In humid summer months, a solid wood door can swell enough to add 1/8 inch to its width.

That extra material pushes against the frame. In winter, drier air shrinks the wood back down, and the door clears again. This is normal and usually not a sign of structural issues.

When should I call a professional instead of fixing it myself?

If the frame is severely racked out of plumb by more than 1/4 inch, or if the door is fire rated and needs material removal beyond the manufacturer's limit, call a carpenter. The same goes for any door that has visible water damage, rot, or a broken frame. A professional can also help with oversized or heavy solid wood doors that are difficult to handle alone.

Do I need special tools to fix a sagging door?

No. A screwdriver or cordless drill, a level, a hammer, a pin punch, and a block plane or sandpaper cover almost every fix. A chisel helps if you need to deepen a hinge mortise.

None of these tools cost more than $25 individually, and most homeowners already own them.

How do I fix a door that sags because the frame is out of square?

Remove the trim casing on the hinge side. Check the jamb with a level. Drive shims between the jamb and the rough opening until it reads plumb.

Fasten through the jamb with 3 inch screws into the framing studs. Reinstall the trim and paint. If the frame is badly twisted or damaged, you may need to replace the jamb entirely.

Final Verdict: Match Your Fix to Your Problem

Every sagging door has a root cause. The fix is almost always simpler than you expect. Here is the shortest path to a door that swings smooth and latches clean.

Start with the screws. Tighten every hinge screw. If any spin freely, repair the hole with toothpicks and glue. Then replace the jamb screws with 3 inch wood screws.

This fixes the majority of sagging doors and takes less than 10 minutes.

If the screws are tight and the door still rubs, check the pin. A bent or rusted hinge pin needs replacing. Pull the pin, inspect it, and swap it for a matching hardware store part.

If you see scuff marks on the door edge, plane or sand it. Work in thin passes. Check your fit after each one. Stop if you hit hollow core material.

For fire rated doors, check the manufacturer spec before removing any wood.

If nothing else works, adjust the frame. Shim behind the hinge leaf. Deepen the mortise. Or reset the jamb.

These steps take longer, but they solve the problem permanently.

A sagging door is one of those repairs that feels bigger than it is. Grab a screwdriver. Check the screws.

Chances are, that is all you need to do. If it is not, the process above will walk you through every other possibility. You will have that door swinging like new before lunch.