How many hinges are needed on a door: some have three, some have two, why?

Usually at least 3 hinges need to be fitted on a door.  Light weight internal domestic doors may be fitted with only 2 hinges.  Doors with a security function need to have at least 3 hinges, as this makes them more difficult to force.  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. Consider any other factors that increase the loadings of hinges and their fixings – extra wide doors, high level of abuse, e.g. school or hospital.

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