Fitting Door Handles: Measure, Fit and Align Properly
Step-by-step help for replacing or fitting internal and external door handles, covering backset, spindle length, latches, locks and alignment.
Swapping door handles is one of the most satisfying small jobs in a home, and also one that goes wrong when measurements are guessed. A set of handles that does not match the existing latch, or that sits crooked, is annoying every time you use the door. A little measuring up front makes the job quick.
Identify what you have
Doors in UK homes commonly use one of these:
- Latch handles (sprung): for internal doors, with a latch bolt and no lock.
- Bathroom sets: handles with a thumb turn and release on the outside.
- Lock handles: with a keyhole, for rooms that need locking.
- Euro cylinder or multipoint locks: on uPVC and composite doors, where the handle is part of a larger mechanism.
- Mortice locks: found in older wooden doors.
For external doors, security and fit are important. Seek the manufacturer's advice before changing a multipoint handle.
Measure before buying
- Backset: the distance from the door edge to the centre of the spindle. Typical measurements are around 44 mm for a short latch and 57 mm for a longer one, though check yours.
- Spindle length: the square bar that passes through the door, which depends on door thickness.
- Fixing centres: the distance between screw holes, or the spacing between handle and keyhole.
- Door thickness: often 35 to 44 mm.
- Handle type: lever on rose, lever on backplate, or round knob.
Take the old handle and latch with you when shopping, or photograph them with a ruler.
Fitting new handles on an existing latch
- Remove the screws on the old handle, either visible or under a cover plate.
- Pull off the handles and spindle.
- Check that the latch moves smoothly and the spindle hole is clean.
- Slide the new spindle through the latch, and fit the handles on each side.
- Fix with screws, tightening just enough, and check movement.
- Test the handles against the strike plate, adjusting the latch if needed.
Fitting a new latch
If there is no existing latch, you will need to cut a mortice into the edge of the door and bore a hole through its face.
- Mark the height; handles are commonly fitted at around 90 to 100 cm from the floor.
- Use a drill bit and chisel to form the mortice for the latch.
- Drill the spindle hole to the size in the instructions.
- Insert the latch and mark the strike plate.
- Chisel the recess in the frame and fit the strike plate.
This takes more care, and a poorly aligned latch may rattle or fail to close.
Alignment problems
- Door does not latch: the strike plate may be too far in or out, or the door may have dropped on its hinges.
- Handle droops: the spring may be weak, or the spindle may be too short.
- Sticking handle: the screws may be too tight or the spindle misaligned.
Hinge and frame alignment sometimes need adjustment before new handles can work properly.
Safety and security notes
- Do not remove or alter locks that are part of an insurance requirement without checking your policy.
- Fire doors often have specific hardware; changing them can affect fire performance. Use handles and latches suitable for fire doors where required.
- Bathroom locks with emergency release are useful in family homes.
Plan the job in one visit
Handles, letterboxes and other door furniture are usually quick to fit together. If you would rather not do it yourself, prepare for the installer's visit with measurements and photos.
A worked example: swapping a pair of internal handles
You have a bedroom door with worn lever handles on a latch. Unscrew the old handles, noting whether the screws are visible or hidden behind a rose. Measure the existing spindle length and screw-hole spacing. Fit the new handles with the same spindle length (or one that adjusts), put the spindle through the latch, and screw the roses on. Test the latch several times. The whole job takes about 15 to 25 minutes per door, as a general guide.
Handle types compared
| Type | Typical use | Watch for |
|---|---|---|
| Lever on a rose | Internal doors | Spindle length and fixings |
| Lever on a backplate | Older doors | Distance between holes |
| Pull handle | External or glass doors | Through-bolts and door thickness |
| Cabinet knob or bar handle | Cupboards and drawers | Centre-to-centre spacing |
Fitting cabinet handles tidily
- Measure the existing hole spacing, or choose a standard one.
- Make a drilling template from card.
- Mark one hole through the template, then drill through the front, ideally with a scrap board behind to prevent breakout.
- Fit and tighten gently, as veneers and thin doors split easily.
Mistakes to avoid
- Buying handles before checking the backset and spindle length.
- Over-tightening and splitting chipboard fronts.
- Misaligning hole drilling across a bank of drawers.
Security notes
External door handles, locks and cylinders affect security and, in some cases, insurance terms. For these, use components that meet the standard in your policy and ask a locksmith if unsure.
Frequently asked questions
Do all door handles fit all doors?
No. Backset, spindle length and fixing centres need to match, and different latch types need different handles.
Can I change the handle on a uPVC door myself?
Sometimes, but the handle connects to a multipoint lock, so it needs the right fixing centres and spindle. If the lock fails, a specialist may be needed.
How do I stop a handle sagging?
Check the screws are tight, replace weak sprung handles, and make sure the spindle fits snugly. Sagging often means worn internal parts.