Door handing — also called swing direction or DIN side — describes which side of the frame the hinges sit on and the direction in which the door or window opens. It determines the hardware, lock and handle you need to order and how the door sits in the room.
DIN-left or DIN-right (European)
According to DIN 107 — the European standard — you determine the handing by standing on the side where the hinges are visible (the outside of the door, the side the door swings toward you):
- DIN-left — hinges on the left, handle on the right, door opens to the left
- DIN-right — hinges on the right, handle on the left, door opens to the right
In the United States a different system is used (left-hand / right-hand), which can cause confusion with imported hardware.
Why door handing matters
Handing determines:
- Hardware — locks, hinges and handles are often mirrored versions
- Installation space — an inward-opening door needs free interior space
- Escape routes — fire exit doors must open in the direction of escape
- Accessibility — wheelchair users may need a specific handing
- Privacy — an inward-opening bathroom door may be undesirable
Applications
When ordering a door or window, handing must be specified up front:
- Sketch a plan — show the room and the desired walking path
- Choose the hinge side — usually against a wall, not in the middle of a doorway
- Check the swing direction — the door must not hit a radiator or piece of furniture
- Consider the angle of approach — a 90° swing into a corner often works well
Universal handing
Some modern doors — especially flush internal doors with overlap rebates and standard locks — can be configured left or right before installation by swapping hinges and strike plates. This adds flexibility, but older blunt doors and external doors with profile cylinders are usually fixed-handed.
Related terms
- Door
- Hinge
- Butt hinge
- Hardware
- Door rebate
- Door lock
Want to learn more about construction terms? Visit our knowledge base at fredsdiyplans.com.