hinges on fire-resisting doors are unusually thick, and have an intumescent pad behind them to prevent conduction of heat. Maybe you mean one of them. A competent fitter will cut the hinge rebate depth to allow for the extra thickness. They feel like stiff flexible plastic foam Examples
Wooden doors are particularly easy to fit using a plane and chisel in skilled hands. plastic doors are more difficult but should have adjustable hinges, catches and locks.
External doors are not usually fire resisting, except on flats or other places where they open onto a balcony or path that might be used to escape from a fire
Where is the door binding? you can identify it by rubbing chalk on the edge of the door, and another colour chalk on the frame, and looking to see where it rubs off.
you'd either adjust the hinges, or plane the top of the door.
in some cases, the installer is expecting the door to settle a little over time, and fits it tight at the top.
what are the door and frame made of?
does the problem vary with weather or season?
external doors can be very heavy and you may benefit from having an assistant, and folding wedges, unless you are a weightlifter and not prone to hernia.
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