What Is Door Handle Backset? Common Sizes and How to Measure
If you’re replacing door handles or latches in your home, you’ll notice references to “backset” in product descriptions. But what exactly does this term mean, why does it matter, and which sizes are standard in the UK? This guide explains backset, why it’s crucial for getting the right fit, and how to order exactly what you need from Door Handle Company.
What Does Backset Mean?
The backset is the distance from the edge of the door to the centre of the spindle hole—the hole where the handle or knob mechanism fits through the door and connects to the latch. It’s a key measurement that determines both how the handle sits on the door and how comfortable it is to use.
This measurement affects both lever handles and door knobs because it determines where the handle is positioned and how much space you have around it.
Why Is Backset Important?
Choosing the correct backset ensures that:
- Your handle is comfortably positioned on the door, with enough clearance from the door frame.
- The latch or lock works smoothly and aligns with the handle’s spindle.
- Replacement handles and latches fit existing doors without requiring extra drilling or visible gaps.
If you’re buying a new tubular latch or mortice lock, always check the backset dimension before ordering.
How to Measure Door Backset
To measure backset:
- Open the door so you can access the edge.
- Locate the latch plate or lock faceplate.
- Measure from the edge of the door (not the faceplate) to the centre of the spindle hole.
Most latches and locks on the DHC website will list both the overall case size (the full length of the latch body) and the backset size. If in doubt, contact our team for help.
What Are the Most Common Backset Sizes?
In the UK, the most common backset sizes are:
- 44mm / 57mm case size (57mm overall, 44mm backset): The spindle sits 44mm from the edge of the door. This is the standard size for most modern tubular latches, used for internal lever handles.
- 57mm / 45mm backset: For some mortice locks, especially those with backplate handles.
- 60mm backset: Sometimes used for wider doors or when more clearance is needed—check our heavy duty latches for these options.
- 82mm / 60mm backset: Larger latches for certain external doors and vintage timber doors.
Check the DHC latch selection and use the filtering tools to find products by backset measurement.
Which Backset Size Should I Choose?
For most UK internal doors fitted with lever handles on rose or modern backplate handles, a 44mm backset is standard and usually ensures a neat, practical fit. This is especially true for replacement projects in homes built in the last 40 years.
For door knobs, you may want a larger backset (57mm or 60mm) so your knuckles don’t brush the door frame during use. Always double-check the handle’s style and intended position before selecting a latch or lock.
If you’re unsure, Door Handle Company’s team can recommend the best latch or lock for your particular door and handle combination.
Special Cases: Bathroom and Euro Lock Backsets
- Bathroom locks:
Most bathroom mortice locks use the same 44mm backset, but some doors may require a 57mm or 60mm backset for additional clearance, especially when fitting thumbturns alongside a handle.
- Euro-profile locks:
If you’re fitting a Euro cylinder lock (commonly used on uPVC or composite doors), check the lock case details. Many multi-point locks use a 35mm or 45mm backset—refer to the DHC Euro lock range for specifics.
What Happens If I Choose the Wrong Backset?
Using the wrong backset can lead to:
- The handle being too close to the door frame, making it hard to grip.
- Visible gaps or misalignment between the handle and latch.
- The need for additional drilling or modifications, risking damage to your door.
For a seamless upgrade, always match the backset of your new latch, lock, or handle to your door’s measurements.
Matching Your Hardware
When buying new latches or locks, remember to coordinate finishes with your door handles, hinges, and keyhole covers or escutcheons. Door Handle Company’s range allows you to create a unified, stylish look throughout your home.
For technical advice and visual guides on measuring door backset, see Homebuilding & Renovating’s article on door latches and locks.
Why Buy Your Latches and Handles from Door Handle Company?
- Clear, detailed product listings—never guess what you’re buying
- Expert support, fast UK delivery, and advice on any project
Ready to upgrade your doors? Shop latches and handles now or contact our team for tailored advice.
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