A sagging door is a common household issue often caused by loose hinges, settling foundations, or wear over time, but it's usually fixable with basic tools and DIY steps. Tightening screws or making minor adjustments can restore smooth operation without calling a professional.

Common Causes

Sagging happens when hinges loosen from daily use, stripping screw holes in the door frame, or when homes settle, misaligning the jamb. In older homes or humid climates, wood expansion or heavy doors exacerbate the problem, leading to rubbing edges or poor latching. Forum users on Reddit often point to foundation shifts in older builds as a sneaky culprit.

Step-by-Step Fix

Follow these proven methods from handyman guides and DIY videos, starting simple and escalating as needed.

  1. Tighten Hinge Screws : Use a screwdriver (not a drill) to snugly tighten all screws on the top and middle hinges—top two first, as they bear most weight. Test the door swing after.
  1. Fill Stripped Holes : Dip toothpicks or matchsticks in wood glue, pack into loose holes, snap off excess, and re-screw once dry (about 1 hour). This grips better than new screws alone.
  1. Upgrade to Longer Screw : Swap the top hinge's center screw for a 3-inch #10 wood screw to anchor into the wall stud for extra lift.
  1. Add Shims : Behind the lower hinge, insert thin cardboard or plastic shims to raise the door bottom, then reattach.
  1. Bend Hinges if Needed : Gently tap with a hammer or use pliers/wrench to bend knuckles toward the door side for minor realignment—careful not to overdo it.
  1. Sand Rubbing Edges : As a last resort, lightly sand contact points with 120-grit paper, checking fit frequently to avoid over-removal.
  1. Check Frame : If persistent, inspect for warped jambs; pros shim or plane them.

Tools You'll Need

  • Screwdriver set
  • Wood glue, toothpicks/dowels
  • 3-inch wood screws
  • Sandpaper or plane
  • Hinge shims, hammer

Alternative Viewpoints

Some YouTube creators emphasize analyzing gaps first—measure top/bottom for evenness before fixes—to avoid unnecessary sanding. Reddit threads debate shims vs. longer screws, with many swearing by glue-filled toothpicks for quick wins on interior doors. For exterior doors, users warn of weather seals or settling foundations needing pros.

When to Call a Pro

If fixes fail or you spot frame cracks/foundation issues, hire help to avoid bigger structural problems—especially in settling homes.

TL;DR : Start with tightening hinges and toothpicks/glue; most sags fix in under 30 minutes.

Information gathered from public forums or data available on the internet and portrayed here.