How to Fix a Sagging Door begins with recognizing the signs. You hear it before you see it. A faint shhhh across the floor, a stubborn latch that needs a hip-check, a top corner that suddenly kisses the jamb. One morning, the door that has opened and closed a thousand times just… doesn’t. It has joined the quiet epidemic of sagging doors—one of the most common—and most misunderstood—household problems.
Here’s the good news: the vast majority of sagging doors do not need to be replaced. In many cases, a single longer screw—a 2½- or 3-inch wood screw swapped into the top hinge—can pull the entire slab back into alignment. The even better news? Once you understand why doors sag, you can choose the right fix instead of guessing, sanding, or planing in the wrong place.
This guide is your field manual. We’ll diagnose the sag, walk through seven fixes ranked from easiest to most involved, and cover the exterior-door and 2026 hardware trends that most generic articles ignore.
Why Doors Sag: The Forces at Work
Every time a door swings, its full weight lever-actions against the hinges and jamb. Over thousands of cycles, the wood fibers behind hinge screws compress, screw holes enlarge, and the door slowly rotates downward at the latch side. It’s gravity plus time—relentless and predictable.
But hinges are only one suspect. A sagging door is often a symptom of one or more of these underlying causes:
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Loose hinge screws — the top hinge loosens under constant tension, widening the gap on the hinge side and closing the gap on the latch side until the top corner binds.
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Stripped screw holes — the wood behind the jamb wears away, so screws spin without gripping.
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Bent hinges — a hinge knuckle bends out of shape, shifting the door leaf sideways.
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House settling or frame racking — foundation movement or dried framing can twist the opening out of square.
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Humidity and wood movement — seasonal swelling or shrinkage warps the slab or tightens the fit.
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Heavy doors — solid-core and solid-wood doors sag faster because their weight accelerates hinge fatigue.
The critical insight: the door itself is rarely the problem. The real culprit usually lives on the hinge side, not the latch side where the rubbing appears. That’s why sanding the rubbing corner without checking the hinges is a rookie mistake—you remove material from the door to compensate for a problem that lives three feet away.
Step 1: Diagnose the Sag Like a Pro
Before you pick up a screwdriver, close the door slowly and study the reveal—the gap between the door slab and the jamb. An ideal reveal is roughly ⅛ inch and even on the sides and top. Here’s what uneven gaps tell you:
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Narrow or rubbing gap at the upper latch-side corner, wider gap at the upper hinge side → the door has rotated downward; loose upper hinge or hinge sag is the likely cause.
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Bottom edge dragging on the floor → hinge sag or a change in flooring clearance.
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Latch misses the strike plate → the door has shifted vertically.
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Door swings open by itself → the slab or frame is out of plumb.
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Rattles when closed but gaps look even → the strike plate or door stop is the issue, not the hinges.
A simple physical test confirms hinge looseness: open the door partway, grasp the handle, and gently lift upward. If the door moves noticeably at the hinges, the screws or hinge leaves are loose.
Step 2: The Seven Fixes, Ranked by Effort
Fix 1: Tighten Every Screw (The Five-Minute Check)
Start with the simplest intervention. Open the door and inspect all hinge screws on both the jamb leaf and the door leaf. Tighten them snugly with a hand screwdriver, not a high-torque drill—over-torquing can strip the wood. Pay special attention to the top hinge, which carries the most stress. A surprising number of minor sags disappear at this stage alone.
Fix 2: The Long-Screw Trick (The Most Effective Single Fix)
If tightening doesn’t hold, replace one screw in the top hinge—specifically the screw closest to the doorstop on the jamb leaf—with a 2½- or 3-inch wood screw. Factory hinge screws are often only ¾ to 1 inch long and grip only the jamb. A longer screw penetrates through the jamb, through the shims, and bites into the structural framing stud behind it. Driving that screw pulls the top of the door toward the jamb, correcting the sag on the latch side.
Pro tip: Angle the long screw slightly inward toward the framing when you drive it—this increases the pull and aligns the door more aggressively. Use a screw with the same head diameter as the original so it seats flush in the hinge mortise.
Fix 3: Repair Stripped Screw Holes
If a screw spins without tightening, the hole is stripped. You have three escalating options:
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Toothpick and wood glue (light duty): Pack glue-coated toothpicks into the hole, snap them flush, let the glue cure, and re-drive the screw.
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Wood dowel and epoxy (permanent): Drill the hole to ¼ inch, insert an epoxy-coated dowel, cut it flush, and drill a fresh pilot hole. This restores solid wood for the screw to bite.
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Longer screw into fresh wood: If the surrounding jamb is sound, a longer screw that reaches the jack stud can bypass the stripped section entirely.
For hollow-core doors, longer screws may hit only air because the internal stile is often just 1 inch thick. In that case, epoxy on the screw threads is the better repair.
Fix 4: Shim the Hinges (Lateral Adjustment)
If the door rubs on the latch side but the hinges are tight, the slab may need to move sideways. Remove the hinge leaf from the jamb and place a thin, rigid shim—cardboard or plastic—behind the leaf near its rear edge. Reattach the hinge. This pivots the door away from the rub point. To correct binding on the hinge side, do the opposite: move the hinge closer to the frame stop.
Fix 5: Bend a Bent Hinge Knuckle
If the gap between hinge plates is visibly uneven, a hinge knuckle may be bent. Remove the hinge pin, clamp an adjustable wrench onto the knuckle on the door leaf, and bend it slightly toward the door. The distance you bend should match the distance you want the door to move—small increments, test often.
Fix 6: Adjust the Strike Plate and Door Stop
A door that latches but rattles doesn’t have a hinge problem—it has a strike plate problem. Many strike plates have a flexible metal tab; bending it slightly inward with pliers increases pressure on the latch bolt and pulls the door tighter into the frame. If the latch misses the plate vertically by less than ⅛ inch, you can file the screw holes in the strike plate into small slots and shift the plate up or down.
Fix 7: Address the Frame (When the Opening Itself Has Moved)
If multiple doors in the same area sag, the problem may be structural—a settled foundation or a racked frame. Shimming the hinges can buy time, but persistent frame movement warrants a professional evaluation. This is the fix most DIY guides skip, and it’s the one that prevents you from “fixing” the same door every six months.
Exterior Doors: The High-Stakes Sag
An exterior sagging door is more than an annoyance. Misalignment compromises the weather seal, letting conditioned air escape and driving up energy bills. It also undermines security: a door that doesn’t sit square in the frame may not engage the deadbolt cleanly.
The diagnostic logic is the same, but the stakes demand a dollar-bill test: close the door on a dollar bill placed between the slab and the weatherstripping. If the bill slides out easily, the seal lacks compression. After correcting the hinge alignment, adjust the strike plate tab to pull the door tighter against the seal. Replace compression weatherstripping every five to seven years, and add a door sweep if the bottom seal is worn.
Important: Fix the sag before replacing weatherstripping. New seals installed on a misaligned door will compress unevenly and fail prematurely.
Common Mistakes That Make It Worse
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Sanding the rubbing corner first. The rub is usually a symptom of hinge-side movement, not excess material on the latch side. Sanding the door is irreversible; checking the hinges takes minutes.
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Using a drill to tighten hinge screws. High torque strips soft wood in seconds. Use a hand screwdriver for final tightening.
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Driving a longer screw into a hollow-core door. It may bite nothing but air. Use epoxy or a dowel repair instead.
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Oversized screw heads. A head that protrudes above the hinge leaf will bind when the door closes and shift the alignment you just corrected.
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Ignoring multiple sagging doors. One door is a hinge problem; three doors are a house-settling problem.
Repair vs. Replace: A Balanced Decision Framework
Repair almost always wins when the door leaf, frame, and threshold are structurally sound. A targeted hinge fix costs a few dollars and an hour of time. Replacement enters the conversation when:
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The door slab is cracked, rotted, or warped beyond flattening.
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The frame is soft or water-damaged.
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Repairs recur within months because the wood can no longer hold fasteners.
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The repair cost approaches half the price of a new door, especially on a door over 15 years old.
For exterior doors, prioritize repair if the frame is solid; replacement becomes the smarter long-term investment when water intrusion has compromised the assembly.
2026 Trends: Smarter Hardware, Fewer Sagging Doors
The door hardware market is quietly undergoing an adjustment revolution. Adjustable hinges—with internal Allen-key mechanisms that allow vertical and horizontal movement—are gaining share in modular and prefabricated construction, where precise on-site tweaking is expensive. Self-closing and soft-close hinges are increasingly driven by safety and building-code requirements, not just convenience. And heavy-duty hinges are becoming standard in commercial and high-traffic residential applications where standard hinges fatigue prematurely.
The practical takeaway for homeowners: if you’re replacing hinges anyway, choose adjustable models. They let you correct future sag without reaching for a screwdriver and a prayer.
Key Takeaways (Quick Summary Box)
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Diagnose the reveal, not the rub. An uneven gap at the top latch-side corner with a wide gap on the hinge side signals hinge sag.
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Try the long-screw trick first. A 2½–3-inch screw in the top jamb hinge is the single most effective low-effort fix.
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Stripped holes need new material, not just a bigger screw. Toothpicks for light duty; dowel and epoxy for permanence.
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Exterior doors need alignment and seal checks. Fix the sag before touching weatherstripping.
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Multiple sagging doors = structural conversation. Call a pro if the frame is moving.
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Repair when the structure is sound; replace when the wood can no longer hold fasteners.
Frequently Asked Questions About How to Fix a Sagging Door
How do I know if my door is sagging or just swollen?
A swollen door typically sticks seasonally and the reveal looks tight all around. A sagging door shows an uneven reveal—tight at the top latch side and wide at the top hinge side—and often swings open on its own. Check the hinges before planing anything.
Can I fix a sagging door without removing it?
Yes. Tightening screws, driving a long screw into the top hinge, repairing stripped holes, and adjusting the strike plate can all be done with the door hung. Removing the door is only necessary for bending hinge knuckles or replacing a hinge.
What size screw should I use to fix a sagging door?
A 2½- to 3-inch wood screw with the same head diameter as the original hinge screw. It needs to reach through the jamb and into the framing stud.
Why does my door sag again after I fix it?
Recurring sag usually means the screw is gripping only soft jamb wood, not the structural stud behind it, or the hole was not properly repaired. If the problem returns repeatedly, the frame may be moving.
Should I use longer screws in every hinge?
No. Start with the top hinge, which carries the most leverage. Adding long screws to every hinge can over-constrain the door and make future adjustments harder. One well-placed long screw in the top hinge often solves the problem.
Is a sagging exterior door a security risk?
Yes. Misalignment can prevent the deadbolt from fully engaging and can compromise the weather seal. Correct the hinge alignment and verify that the latch and deadbolt throw freely before considering the job done.
When should I call a professional?
Call a pro if multiple doors sag, if the frame is visibly out of square, if the door is rotted or cracked, or if you’ve repaired the same hinge three times and the sag keeps returning.
Sources: How to Fix a Sagging Door
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HomeTips, “How to Fix a Sagging Door That Won’t Close Properly” (2026) — hinge diagnosis, long-screw technique, reveal analysis.
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EngineerFix, “How to Adjust an Exterior Door for a Tight Seal” — hinge adjustment, dollar-bill test, strike plate tuning.
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This Old House, “How to Repair a Stripped Screw Hole” — dowel-and-epoxy method, screw head sizing.
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Fenelon Handyman Services, “How to Fix a Stripped Screw Hole in Wood, Drywall, and MDF” (2026) — toothpick vs. dowel vs. longer-screw comparison.
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HomeTips, “How to Fix a Loose or Warped Door” (2026) — warping vs. alignment diagnosis, strike plate adjustment.
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Research and Markets, “Door Hinges Market Report 2026” — adjustable, self-closing, and heavy-duty hinge trends.
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RC Windows & Doors, “Door Repair Guide: Repair or Replace?” (2026) — repair vs. replacement decision framework.
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