What you will notice
A sticking door is easy to live with. You give it a shove and move on. But the way it sticks tells you a lot.
Rubs at the top corner
The door scrapes the frame at the top, away from the hinges.
Will not latch
The latch misses the hole in the strike plate, high or low.
Uneven gap
The gap around the door is wide at one end and tight at the other.
Swings on its own
The door drifts open or closed when you let go.
Windows bind
A window will not slide up, or shows a gap at one corner when shut.
Slider drags
A sliding glass door gets hard to open or jumps its track.
Cracks at the corners
Drywall or stucco cracks running at an angle from the door or window.
Several at once
Two or three doors in the same part of the house start sticking in the same season.