Replacing a uPVC door handle, getting the correct size is absolutely crucial. A handle that doesn't fit will not only look wrong but can also prevent your lock and door mechanism from working properly. Many homeowners make the mistake of guessing or using approximate measurements, which often leads to wasted time, returns, and extra costs.

The good news is that with a tape measure and a few simple steps, you can measure your uPVC door handle correctly and order a replacement with confidence.

This article will guide you step by step through the process, explain the key measurements you need, and share some tips to make the job easier.

Why Accurate Measurement Matters

Your uPVC door handle isn’t just for opening and closing the door—it’s directly connected to your lock mechanism (also called a multipoint lock). If the new handle doesn’t line up perfectly with the spindle and keyhole, the door won’t lock properly. A poorly fitted handle can also cause unnecessary strain on the locking mechanism, which might lead to expensive repairs later.

By measuring carefully, you’ll ensure:

Correct fit: The screw holes, spindle, and cylinder align properly.

Smooth operation: No stiffness or misalignment when locking and unlocking.

Better security: A handle that works in harmony with your lock keeps your home safe.

Neat appearance: A properly sized handle looks professional and tidy on your door.

Tools You’ll Need

Measuring your uPVC door handle doesn’t require special tools. You only need:

A tape measure or ruler (in millimetres for accuracy).

A notepad and pen to record measurements.

Optionally, a screwdriver if you want to remove the handle to measure more easily (though many measurements can be taken without removing it).

Key Measurements You Need

There are several important measurements to take when replacing a uPVC door handle. Each one plays a role in ensuring the new handle lines up with your lock.

1. PZ Measurement (Spindle to Keyhole Distance)

This is the most important measurement. It refers to the distance between the centre of the spindle (the square hole where the handle bar goes through) and the centre of the keyhole.

To measure: Place your tape measure at the centre of the spindle hole and measure to the centre of the keyhole.

Common PZ sizes: 92mm, 72mm, 68mm, and sometimes 48mm.

Tip: On most modern uPVC doors, 92mm is the standard PZ measurement, but don’t assume—always measure.

2. Backplate Fixing Centres (Screw Hole Distance)

This is the distance between the top screw hole and the bottom screw hole that fix the handle to the door.

To measure: Place your tape measure from the centre of the top screw hole to the centre of the bottom screw hole.

Common sizes: 122mm, 210mm, and 240mm.

This measurement ensures that your new handle screws directly into the same fixing points without drilling new holes.

3. Overall Backplate Length

Measure the entire length of the handle backplate from top to bottom.

This isn’t always critical for function, but does help with appearance.

Standard backplate lengths are usually between 200mm and 300mm.

4. Backplate Width

Measure across the backplate at the widest point.

Typical widths are around 30mm–40mm.

Ensures your replacement handle looks proportionate and covers any marks left by the old handle.

5. Spindle Size

The spindle is the square bar that connects the inside and outside handles, passing through the lock mechanism.

Measure the thickness of the spindle hole (commonly 8mm).

Some older doors may have 7mm spindles, so don’t skip this check.

6. Keyhole Shape and Position

Most uPVC doors are designed for euro profile cylinders, but it's worth confirming that your keyhole shape matches the replacement handle.

Some doors may use oval profile cylinders instead.

Always double-check the alignment of the keyhole with your PZ measurement.

7. Handle Function (Lever/Lever or Lever/Pad)

When replacing your handle, it's important to identify the correct style:

Lever/Lever: Both sides have a standard lever handle.

Lever/Pad: One side has a lever, and the other has a fixed pad (often used for front doors where entry requires a key).

This choice affects both aesthetics and functionality, so make sure your new handle matches.

Step-by-Step Guide to Measuring Your uPVC Door

Check the door type: Confirm that you have a uPVC (or composite) door with a multipoint locking system.

Locate the spindle hole and keyhole: These are the reference points for most measurements.

Measure the PZ distance: From the center of the spindle to the center of the keyhole. Record in millimeters.

Measure the screw fixing centers: From the center of the top fixing screw to the center of the bottom fixing screw.

Record overall length and width: Measure the full backplate length and width for cosmetic fit.

Check spindle size: Measure the thickness of the square hole.

Note the handle style: Decide whether you need lever/lever or lever/pad.

Double-check everything: Re-measure to confirm accuracy before ordering.

Common Mistakes to Avoid

Guessing instead of measuring: Even if your door looks “standard,” don't assume. Sizes vary.

Measuring edge to edge instead of center to center: Always measure from the center of holes.

Ignoring handle function: Accidentally ordering a lever/lever when you need lever/pad.

Not checking spindle size: Some suppliers only sell 8mm spindles—make sure yours matches.

Overlooking aesthetics: Even if the technical measurements fit, make sure the new handle will cover any old marks.

Practical Tips for Success

If you're unsure, remove the handle from the door. This makes measuring easier and avoids mistakes.

Take a photo of your current handle with the measurements noted. This helps when shopping online or in-store.

Always record measurements in millimeters (mm), as this is the industry standard.

When in doubt, take your old handle to a hardware shop for comparison.

When to Replace a uPVC Door Handle

You may need to replace your uPVC door if:

·       The handle is loose, floppy, or sagging.

·       It's difficult to lock or unlock the door.

·       The finish has worn away or become tarnished.

·       The handle has broken completely.

Replacing the handle is often cheaper and simpler than replacing the entire locking system, provided you measure correctly.

Conclusion

Measuring your uPVC door handle correctly is straightforward once you know what to look for. The key measurement is the PZ distance (spindle to keyhole), followed by the screw fixing centers, and then the overall dimensions for appearance. By taking accurate center-to-center measurements and noting the handle style, you can order a replacement that fits perfectly and restores your door to smooth, secure operation.