Paint buildup is another quiet factor. Multiple layers of paint on a door edge or strike plate can interfere with how smoothly the latch engages. It doesn’t usually cause a complete failure on its own, but it can create enough resistance that the door doesn’t close cleanly anymore.
Humidity also plays a role. Wood doors and frames absorb moisture, and in North Carolina’s climate, seasonal changes can cause them to swell slightly. A door that works fine in winter may start sticking or shifting out of alignment in summer when conditions change.
A door that doesn’t latch is typically noted in inspection reports as a functional concern. It affects everyday use and can relate to safety, especially for exterior doors where secure closure is important. The fix is often straightforward, but understanding the underlying cause is important before making adjustments.