How should I fix a sagging door?
It's quite likely that 3-4&quot; screws will grab hold of the framing behind that top hinge and pull it tight, completely fixing the issue.
It's possible that you may need to loosen the screws in the middle hinge, tighten down the top hinge, then tighten the middle hinge screws.
Also, be on the look out for any nails or screws that hold the casing against the framing. Usually, when a door is installed, the opening is 1/2 - 1&quot; wider than the door casing so there's plenty of room to get the frame nice and square in the opening. This extra space is filled with shims to hold it in alignment, then it's nailed or screwed through the shims to hold it steady. It's these screws/nails that I'm referring to. They may have been covered with wood putty before the frame was painted, so they may not be very obvious.
If it was nailed into place, the nails may be slowly slipping out of place, but the heads are remaining buried under the putty. As you pull the frame back straight, it may actually pop the nail through. This will be obvious, and you only need to hammer it back in, then use a nail-set to get it below flush. Some putty &amp; touch-up paint and you're done.
If it was screwed into place, the screw could cause the casing to bow as the threads hold the casing in place while your new, longer screws pull the hinge back in line. Use a long straight edge to detect this. The high spot will likely be a screw location &amp; a magnet should confirm it. You may have to scrape some paint &amp; putty away, loosen these screws, tighten the ones in the hinges then drive these back home.
Finally, do not try to bend the hinge. It won't fix this problem and it will create new ones.