We have been called out on numerous occasions after new doors have been fitted, being told that the doors are sticking or not shutting as they did when first installed. Quite often when we check the doors we find that either the bottom, or the top, or even both have not been painted and therefore have taken on moisture and swollen causing the problem.
This can be easily overcome over time. The door will need to dry out over a prolonged warm spell (weather permitting). Once dry adjustments can be made if required and then the door/doors need to be decorated correctly.
Hinges, locks, bolts and any other furniture will need a light oil to maintain them.