How to Measure PZ Size on a UPVC Door Handle (UK Guide)

27 February 2026

Introduction

If you're replacing a UPVC door handle, measuring the correct PZ size is essential. Choosing the wrong size will prevent the handle from aligning with the lock mechanism.

This guide explains what PZ means and how to measure it accurately using simple tools.

What Does PZ Mean?

PZ is the distance (in millimetres) between:

The centre of the handle spindle (square hole)
The centre of the keyhole

This measurement determines compatibility with your existing multipoint lock.

The most common UK PZ size is 92mm.

Tools You Need

Tape measure or ruler (mm scale)
Screwdriver (optional if removing handle)

Step-by-Step: How to Measure PZ

Locate the square spindle hole on the handle.
Find the centre of the keyhole below it.
Measure from centre to centre in millimetres.
Record the exact measurement (e.g., 92mm).

Do not estimate. Accuracy matters.

Common UK PZ Sizes

92mm (most common modern UPVC doors)
70mm
72mm
68mm

Always match your measurement exactly.

Final Check Before Ordering

Before purchasing, confirm:

PZ size
Screw centres
Backplate length
Door thickness

If unsure, contact our team for technical support.