How to fix a sagging door: a complete step-by-step guide

A sagging door is one of those household problems that sneaks up on you. First it drags slightly along the floor. Then the latch stops clicking properly. Then one morning you let go of the handle and the door just drifts open on its own, like it has given up. The good news? In most cases, fixing a sagging door is a straightforward DIY job that costs next to nothing and takes less than an hour.

This guide walks you through every step, from figuring out what is actually going on to applying the right fix, and knowing when to just call someone. Whether your door is hollow-core, solid wood, or a heavy front door that weighs a small amount more than you expected, there is a solution here.

• What is a sagging door and why does it happen?
• Common causes of a sagging door
• How to diagnose the problem before you start
• Tools and materials you will need
• Method 1: Tighten the hinge screws
• Method 2: Replace screws with longer ones
• Method 3: Fill stripped screw holes
• Method 4: Add or remove hinge shims
• Method 5: Bend the hinge leaf
• Method 6: Clean paint and debris from hinges
• Method 7: Sand or plane rubbing areas
• Method 8: Adjust the strike plate
• Method 9: Replace worn or damaged hinges
• Method 10: Address structural or frame issues
• Prevention and long-term maintenance
• When to call a professional

What exactly is a sagging door?

A sagging door hangs unevenly inside its frame, almost always dropping at the latch side or the top corner. You get a gap that is too wide on the hinge side and too tight on the other, or the door scrapes along the floor when you open it, which is the kind of sound that makes you wince every single time. It might refuse to latch properly, or swing open freely the moment you release the handle. (Neither is ideal when you are just trying to get on with your day.)

Beyond the daily frustration, a sagging door is worth fixing sooner rather than later. It wears down the hinges, the jamb, and the floor. It can let in draughts around the frame, and if the latch no longer engages, it is not exactly doing its job on the security front either.

What causes a door to sag?

Before reaching for a screwdriver, it helps to understand what is actually causing the problem. Because the same symptom, a door that drags or refuses to latch, can come from very different places. Applying the wrong fix wastes time and can make things worse. In my experience helping homeowners work through door problems, the cause usually falls into one of these categories:

• Loose or stripped hinge screws: By far the most common cause, especially on interior doors that get used a dozen times a day. The top hinge carries most of the door’s weight. Over time the screws loosen, the wood around the holes gets worn out, and eventually the screws just spin freely without gripping anything at all.
• Worn or inadequate hinges: Heavy solid-wood or exterior doors need heavy-duty hinges. If only two standard hinges were fitted, or if those hinges have bent or rusted over years of use, the door will gradually sag. Metal-on-metal wear is slow, but it is relentless.
• Foundation settling or structural movement: Every house shifts slightly over time. Older homes in particular can develop door frames that are no longer quite plumb or square, especially after a dry or wet season when soil conditions change. If several doors in your home start playing up at once, structural movement is probably behind it.
• Humidity and moisture: Wood expands in summer humidity and contracts in dry winter air. A door that sticks in July and swings freely in January is almost certainly responding to seasonal changes. Paint buildup under the hinge leaves can also act as an unintended spacer, nudging the door out of alignment.
• Improper installation or heavy use: Doors fitted without proper shimming, or with screws that only reach the jamb rather than the wall stud behind it, sag much faster. High-traffic front doors are particularly vulnerable.

Less common causes include a bent strike plate, a warped door panel, or simply someone hanging a heavy coat rack on the door handle for a few years too many.

How do you diagnose a sagging door before starting repairs?

Always diagnose first. A targeted repair takes ten minutes. A guessed one can take an entire afternoon. Here is a simple inspection routine that covers the most likely causes:

Step 1: Open and close the door several times, slowly. Notice where it rubs, where the gap is widest, and whether the latch bolt lines up with the strike plate. A sagging door almost always shows a wider gap at the top hinge side and a tighter fit at the bottom latch corner.

Step 2: With the door open, grab the latch side and gently lift it. If there is noticeable play at the top hinge, you are almost certainly dealing with loose or stripped screws. That is the first thing to address.

Step 3: Look closely at the hinges. Are any screws missing? Can you turn them by hand? Is there visible paint buildup under the hinge leaf that would stop it from sitting flush against the jamb?

Step 4: Hold a spirit level against the hinge side of the door jamb to check whether it is still plumb. A jamb that is visibly out of plumb points toward a structural cause rather than a hinge problem.

Step 5: Check the strike plate. If the latch bolt leaves a shiny wear mark well above or below the centre of the opening, the door has dropped significantly since it was installed.

Write down what you find. The repair methods below are ordered from simplest to most involved, so knowing your diagnosis lets you jump straight to the right one.

What tools and materials do you need to fix a sagging door?

Most repairs need only basic tools that are already rattling around in any household toolkit. For the more involved fixes you may need a few extra items, but nothing expensive or hard to track down.

Safety note: always support a heavy exterior door with a wedge or shim underneath before removing the hinges. A falling door can cause serious injury, and it is the kind of thing you only need to learn once.

Method 1: Tighten the hinge screws

This is always the first thing to try, and it solves the problem more often than you might think. I have seen doors that were dragging along the floor for months get fixed completely in under five minutes, just by tightening two screws. Two screws.

Open the door fully and prop it open slightly to take the weight off the hinges. Using a manual screwdriver, tighten every screw on both the top and middle hinges, on both the door side and the jamb side. Turn clockwise, with firm steady pressure rather than speed.

If a screw tightens with resistance and stays firm, it is doing its job. If it spins freely without gripping, the hole is stripped and you need Method 3 below.

Test the door after tightening. Open it, close it, check the latch. Many cases of sagging are completely resolved right here.

Method 2: Replace short screws with longer ones

Standard hinge screws are typically only 2.5 to 3 cm long, which means they reach the jamb but stop well short of the wooden wall stud behind it. This is one of the most common oversights in new construction, actually, and the jamb alone simply cannot handle the leverage of a heavy door over time. It just gives way, slowly and quietly, until one day the door starts dragging.

Start with the centre screw on the jamb side of the top hinge. Remove it and replace it with a 7.5 cm (3-inch) coarse-thread wood screw. When you drive it in, it should reach through the jamb and bite firmly into the stud. You will feel the door physically lift slightly as the screw pulls the jamb tight against the framing.

Do the same for the remaining screws in the top hinge, using 4 to 5 cm screws in the other holes. Repeat for the middle hinge. You do not necessarily need to replace every screw at once, but the centre hole of the top hinge is the critical one.

This single fix resolves a large share of sagging doors in older homes.

Method 3: Fill stripped screw holes

A stripped screw hole is why the screwdriver spins without resistance, and no screw, however long, will grip in it. The fix is simple: fill the hole with wood and start fresh.

Remove the hinge completely from that spot. Dip several toothpicks or a short wooden matchstick in wood glue and push them into the hole until it feels snug. Break off the excess flush with the surface. Let the glue dry fully, following the instructions on the label, usually at least an hour, ideally overnight if you can wait.

Once dry, drill a small pilot hole and reattach the hinge with the original screw or a slightly longer one. The wood filler gives the screw fresh material to grip, and the repair ends up essentially as strong as the original installation.

For larger or more badly stripped holes, use a wooden dowel of the right diameter instead of toothpicks. Cut it to length, glue it in, leave it to dry completely, then redrive the screw.

Method 4: Add or remove hinge shims

Hinge shims are thin spacers placed behind the hinge leaf to push it out slightly from the mortise. Adding or removing them lets you make very small adjustments to the door’s position in the frame, sometimes just a millimetre or two, which is occasionally all it takes.

If the door sags at the latch side, try shimming behind the top hinge leaf on the jamb side. This tilts the top of the door slightly toward the latch side, correcting the drop. Loosen the screws without removing the hinge entirely, slide a thin shim of folded cardboard or a commercial metal shim behind the leaf, and retighten.

Conversely, if you find old cardboard shims from a previous repair that are now pushing the hinge out too far, simply remove them and reinstall the hinge flush.

The goal is an even gap of roughly 3 mm all the way around the door. Test after each adjustment. Several very thin shims work better than one thick one, they compress more evenly and are less likely to split the mortise.

Method 5: Gently bend the hinge leaf

This sounds more drastic than it is. It is actually a precise technique for minor misalignment when the hinge itself has bent slightly over time. It works best on doors that are just a fraction off, where shimming alone has not quite done the job.

Remove the door by tapping out the hinge pins with a hammer and screwdriver. Support the door on its edge with a wedge, or have someone hold it. Place the hinge leaf in a vise, or grip the knuckle with an adjustable wrench, and apply a very gentle bend toward the frame side. The target is no more than 1 to 2 mm of adjustment.

Reinstall the door and test. Avoid over-bending, too much correction will misalign the other hinges and create a whole new set of problems. If you are not confident with this one, shimming is a safer route that achieves the same result.

Method 6: Clean paint and debris from hinges and mortises

Layers of paint built up over years of redecorating are a surprisingly common cause of door trouble. It accumulates under the hinge leaves and inside the mortise recesses, acting as an unintended spacer that pushes the hinge out from the jamb. Even two or three coats of paint is enough to noticeably affect the alignment. (Think about that the next time someone paints a house without pulling the hinges first.)

Remove the hinge completely. Use a sharp chisel or a five-in-one tool to carefully scrape the paint out of the mortise until you reach bare wood and the surface is clean and flat. For paint on the hinge leaf itself, soak it in hot water to soften things up, then use a wire brush to remove it. A heat gun works well on stubborn buildup too.

Reinstall the hinge flush against the clean mortise and retighten the screws. Test the door. In older homes that have been painted many times over, this alone can make a striking difference.

Method 7: Sand or plane the rubbing areas

If the door still rubs after all hinge adjustments, the next step involves removing a small amount of material from the door edge or the jamb where contact is happening. This is more of a last resort for hinge-related sagging, but it is sometimes the only real option, especially for seasonal wood movement in humid climates.

Mark the rubbing area precisely. Close the door and slide a thin piece of paper or card along the edge to find exactly where it binds. Mark it with chalk or pencil. For minor rubbing, sandpaper is enough. Remove the door from its hinges and sand the marked area, checking the fit frequently. Remove as little material as possible.

For solid wood doors with more significant warping, a hand plane or electric door planer gives better control. Do not use a planer on hollow-core interior doors, the thin face veneer will be damaged immediately and there is no coming back from that.

Once you have a good fit, seal the exposed raw wood with paint or varnish that matches the rest of the door. Bare wood on the edge absorbs moisture, which speeds up the swelling problem you just fixed.

Method 8: Adjust or move the strike plate

When the door closes but the latch bolt no longer lines up with the strike plate, adjusting the strike plate is often the quickest fix. This is especially true if the door has settled only slightly and the latch misses the opening by just a few millimetres, which is maddening in its own quiet way.

Loosen the strike plate screws and shift the plate slightly up, down, or outward until the latch bolt aligns correctly. Retighten and test. If the existing screw holes get in the way of the new position, fill them first with wood filler before repositioning.

For a loose latch-side jamb, drive a long 7.5 cm screw through the top of the jamb into the structural framing behind it. Countersink the screw head, fill the hole with wood putty, and sand flush when dry. This pulls the jamb tight and stabilises the latch-side frame.

Method 9: Replace the hinges entirely

Sometimes the hinges themselves are simply done, not the screws, not the holes, but the metal itself. Hinges can bend imperceptibly under years of load, rust internally, or just wear out at the knuckle joint. A bent hinge exerts a constant, uneven force on the door that no amount of shimming will permanently fix.

When replacing hinges, always match the original size and weight rating. For a standard interior hollow-core door, a pair of 89 mm (3.5-inch) hinges is typical. For solid-wood interior doors, use 100 mm (4-inch) hinges. For heavy exterior doors or anything over 40 kg, fit at least three heavy-duty hinges.

Replace all hinges at the same time rather than just one if you can. Mixing old and new hinges can cause misalignment, because the worn hinge changes the geometry of the whole setup. Follow the manufacturer’s instructions for mortise depth and make sure each new hinge sits perfectly flush with the jamb surface.

Method 10: Address structural or frame issues

When several doors in your home start sagging around the same time, or when a door you just fixed begins sagging again within weeks, the cause is almost certainly structural rather than anything to do with the door itself. Foundation settling, shifts in soil moisture, or frame movement after significant weather can push door frames out of square and plumb. The door is just telling you something bigger is happening.

Start by placing a long spirit level against the hinge side of the door jamb and checking it both vertically and horizontally. A jamb that is more than 5 to 6 mm out of plumb will cause persistent door problems no matter what you do to the hinges.

In some cases, you can square up a frame by removing the door casing trim, adjusting the frame with shims, and refitting the trim. More involved work, but still within DIY scope for someone with basic carpentry skills. If the frame is visibly warped, cracked, or shows signs of rot, it needs replacement.

If the problem comes with cracks in nearby walls, sticking windows, or uneven floors, talk to a structural engineer or building surveyor before touching the door again. These can be signs of foundation movement that needs a proper professional look.

How do you prevent a door from sagging again?

Fixing a sagging door is satisfying. Keeping it from sagging again is even better. A few small habits will dramatically extend the life of any door installation:

• Tighten hinge screws once a year. Make it part of a yearly home check. It takes two minutes per door and catches problems before they turn into an afternoon project.
• Lubricate hinge pins. A drop of household oil or a quick spray of silicone lubricant on each hinge pin reduces metal-on-metal wear and prevents binding. Wipe off the excess so it does not drip onto the floor.
• Keep indoor humidity in check. Somewhere between 40% and 60% relative humidity minimises wood movement in door panels and frames. A simple hygrometer costs very little and can save a lot of repair work over the years.
• Use the right hinges for the door weight. When installing or replacing a door, never cut corners on hinge size. A heavy solid-wood door on two lightweight hinges will sag within a year, maybe less.
• Do not hang heavy things on doors. Coat hooks, shoe organisers, all the stuff that gets bolted onto the back of a door because there is nowhere else to put it, all of that increases the lever force on the top hinge. Use wall-mounted storage where you can.
• Seal door edges when repainting. Paint the top and bottom edges too, not just the face. Unsealed wood absorbs moisture unevenly, which causes the very warping you are trying to avoid.

When should you call a professional instead of fixing it yourself?

The methods in this guide resolve the vast majority of sagging door problems. But there are situations where calling someone in is simply the right call, and recognising them early saves time, money, and the specific frustration of making things worse.

Call a carpenter or handyman if:

• The door frame is visibly warped, cracked, or rotted and needs replacement.
• You have tried two or more of the methods above without any improvement.
• The jamb is severely out of plumb because of foundation settling.
• The door is a custom, antique, or high-end unit that needs precise realignment to avoid damage.

Consider replacing the door entirely if it is irreparably warped, if a hollow-core panel has been damaged by planing, or if rot has compromised the structure. A new prehung door with a proper installation using long screws into the studs is often the most durable and cost-sensible long-term solution.

Practical summary: which method should you try first?

If you are standing in front of a sagging door right now and wondering where to begin, here is the short version: start with the top hinge. Wiggle the latch side of the door while it is open. If there is any play, tighten the hinge screws. If they spin freely, fill the holes and redrive. If they tighten but the door still sags, swap those short screws for 7.5 cm versions that actually reach the wall stud.

In my experience, eight out of ten sagging doors are fixed by the time you reach Method 3. The remaining cases usually involve structural movement or old paint buildup, both of which are very manageable with the steps above.

One practical tip worth keeping in mind: put a few 7.5 cm coarse-thread wood screws in your toolbox and leave them there. They are the single most useful thing for door and hinge repairs, and having them on hand means you can sort a sagging door the moment you notice it, before a minor annoyance quietly turns into something bigger.