How is the hand of a door determined?

The determination of the hand of a door is based on the position of the hinges when viewed from the inside of the room where the door is primarily used. When looking at the door from this perspective, if the hinges are on the left side, it is classified as a left-hand door, whereas if the hinges are on the right side, it is considered a right-hand door. This method provides a consistent way to identify door handing and is essential for correct installation and hardware application.

Understanding this classification is important for both the fitting of the door itself and the selection of corresponding locking mechanisms and door hardware. It ensures that doors operate smoothly and that additional components, such as door closers and exit devices, are set up correctly to match the door's orientation.