Choosing the right door hardware is easier when you know one important detail: your door handing.
Whether you're replacing a door knob, installing a lever handle, upgrading to a mortise lock, or purchasing a new entry handleset, determining whether your door is left-handed or right-handed can help ensure compatibility and a smoother installation process.
Fortunately, identifying door handing is much easier than many homeowners think.
In this guide, we'll explain how door handing works, how to determine your door's orientation, and when door handing actually matters when purchasing hardware.
What Does Door Handing Mean?
Door handing refers to the direction a door swings and the side where the hinges are located.
Manufacturers use door handing to determine compatibility for certain types of hardware, especially:
- Mortise locks
- Some lever handles
- Entry handlesets
- Specialty locksets
- Commercial hardware
Many standard door knobs are reversible and work on either side, but some hardware requires the correct handing.
The Simple Door Handing Test
The easiest method is to stand on the side of the door where it opens toward you.
Then look at the hinges.
Left-Handed Door
If the hinges are on the left side:
✔ The door is left-handed.
Right-Handed Door
If the hinges are on the right side:
✔ The door is right-handed.
This simple rule works for most residential doors.
In-Swing vs Out-Swing Doors
Door handing becomes more specific when discussing entry doors.
Manufacturers may use terms such as:
- Left-Hand (LH)
- Right-Hand (RH)
- Left-Hand Reverse (LHR)
- Right-Hand Reverse (RHR)
These descriptions combine both hinge location and swing direction.
Left-Hand (LH)
- Hinges on the left
- Door swings inward
Right-Hand (RH)
- Hinges on the right
- Door swings inward
Left-Hand Reverse (LHR)
- Hinges on the left
- Door swings outward
Right-Hand Reverse (RHR)
- Hinges on the right
- Door swings outward
For most interior doors, homeowners only need to identify whether the hinges are on the left or right side.
Does Door Handing Matter for Door Knobs?
In many cases, no.
Most modern door knobs are fully reversible and can be installed on either left-handed or right-handed doors.
This includes:
- Privacy door knobs
- Passage door knobs
- Dummy door knobs
- Most standard keyed entry knobs
However, some products may require handing information.
Examples include:
- Certain lever handles
- Mortise lock sets
- Decorative entry handlesets
- Commercial-grade hardware
Always verify product specifications before ordering.
Does Door Handing Matter for Mortise Locks?
Yes.
Many mortise lock systems require the correct handing because the latch mechanism must face the proper direction.
When purchasing a mortise lock:
✔ Determine hinge location
✔ Determine swing direction
✔ Verify handing requirements listed by the manufacturer
If you're unsure, contact the supplier before ordering.
Common Mistakes When Determining Door Handing
Looking From the Wrong Side
Always stand on the side where the door opens toward you.
Many homeowners accidentally identify handing from the opposite side.
Ignoring Swing Direction
For entry doors and mortise locks, swing direction can be just as important as hinge location.
Assuming All Hardware Is Reversible
Most knobs are reversible, but not all lever handles and mortise systems are.
Always check product details before purchasing.
Which SENY Products Require Handing Consideration?
Handing is most important when selecting:
- Mortise lock sets
- Certain lever-style entry hardware
- Decorative handlesets
Most SENY door knobs and standard locksets are designed for easy installation and fit both left-handed and right-handed doors.
Always review product specifications for exact compatibility.
Frequently Asked Questions
Can I install a door knob on either side?
Most modern door knobs are reversible and work on both left-handed and right-handed doors.
How do I know if my door is left-handed?
Stand on the side where the door opens toward you. If the hinges are on the left, the door is left-handed.
How do I know if my door is right-handed?
Stand on the side where the door opens toward you. If the hinges are on the right, the door is right-handed.
Do mortise locks require handing?
In many cases, yes. Always verify handing requirements before purchasing a mortise lock.
Final Thoughts
Determining whether a door is left-handed or right-handed only takes a few seconds, but it can prevent ordering mistakes and installation problems later.
For most residential door knobs, handing is not a major concern. However, when purchasing mortise locks, entry handlesets, or certain lever handles, knowing your door handing is essential.
Before ordering new hardware, take a moment to check your hinges and swing direction—you'll save time, avoid returns, and ensure a proper fit.
