A door wedge or a thin piece of cardboard is useful for testing the gap. This allows you to nudge the door up or down slightly to achieve proper alignment.
Fix a Door That's Sagging Lower and Missing the Latch
To fix this, close the door and observe where the latch hits the strike plate. Next, check the hinges by opening the door and inspecting the alignment of the hinge plates.
Fortunately, this is a problem that can almost always be resolved without calling a professional, by methodically diagnosing the specific cause and applying the correct adjustment. As a building settles, the frame can become slightly misaligned, causing the door to shift upward or to one side.
Fix Door Sagging Lower Latch Alignment Issue
If the latch hits the top or bottom of the plate, the hole is too high or too low. The constant rattle and gap at the threshold allow drafts, noise, and unwelcome insects to infiltrate your living space.
More About How to fix a sagging door that won't latch
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More perspective on How to fix a sagging door that won't latch can make the topic easier to follow by connecting earlier points with a few simple takeaways.
