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Usually at least 3 hinges need to be fitted on a door. Light weight internal domestic doors may be fitted with only 2 hinges. Fire Regulations require fire doors to be fitted with 3 hinges (which must be 4 inch fire certified hinges). For doors over 2200mm tall, then four hinges can be used to prevent warping.
Consequently, how many hinges should a door have?
As a general rule you will want to use 1 hinge per every 30 inches of door or fraction thereof. Referring to door height: 1. Doors up to 60 inches need 2 hinges.
In this way, should interior doors have 2 or 3 hinges?
Heavy doors need 3. You can get away with 2 on interior doors. If the interior door is heavier than usual just upgrade the hinge to a heavier size. Some have three, others two.
If the hinges squeak when the door closes they must be replaced. Fit the top hinge 200mm from the top of the door and the middle hinge 250mm further down from the centre point of the top hinge and the bottom hinge 200mm from the bottom of the door. Check that intumescent pads have been fitted in the correct material.