UPVC Locks – Changing a Multipoint Locking Mechanism

This is a much easier job than many ‘tradesmen’ would have you believe and is easily within the scope of the average DIYer.

Multipoint locks are incredibly common nowadays and are fitted to far many more new doors than the old traditional ‘Yale’ or ‘Chubb’ type of lock. Multipoint locks are fitted to UPVC doors, timber doors and now the new style ‘composite’ doors which are rapidly taking over from plastic UPVC doors.

The locking mechanism is generally made up of the following 4 elements, which together provide a secure solution for your home.

UPVC multipoint locking mechanism

This is main locking mechanism which runs up the edge of your door. They come with a variety of locking points such as deadbolts, hooks, rollers and spring loaded latches and these often come in a variety of combinations, such as rollers on their own, hooks and rollers etc.

The main locking mechanism runs for most of the height of the door and is usually gold, silver, white or brown in colour. It is fitted to the door by a series of Philips (cross or X headed) screws.


Keeps, or receivers as they are sometimes called, are fitted to the frame directly in line with the locking points (hooks, rollers etc) on the main lock mechanism. They are what the hooks or rollers lock into when the door is closed and the handle lifted.

Normally there is individual keeps for each roller/hook/deadbolt, but sometimes it is a single ‘one piece’ keep running up the frame. It is no matter, they all work the same.


There are many different colours and styles of handles, but the most important aspect is whether they are ‘in-line’ or ‘offset’. What we mean by this is to look if your inside handle is in line with the outside or whether it is higher. Some locks take in-line some offset and if changing them you really need to be swapping like for like.

Euro cylinder or ‘barrel’

This is the small lock in the handles which has a keyhole on the outside and either a keyhole or a knob on the inside…..its purpose is to securely ‘lock off’ the mechanism when you want the door fully locked. You should change this unit straight away if it starts to get loose or stiff or if you have bought or rented a new home as you never know who has keys to the existing barrel.

How to change your multipoint UPVC locks

This is designed as a general guide and will apply to almost all multipoint UPVC locks commonly encountered. Hopefully it doesn’t sound too complicated, but in reality it is quite easy and if you take your time, and measure carefully you will achieve a rewarding result and save lots of money over getting a tradesman to do it.

(i) Firstly with the door open familiarise yourself with both the layout and operation of the lock and its Divine Locks keeps. The locking mechanism itself is normally branded on the long faceplate…look our for something like GU, FERCO, WINKHAUS, MACO, YALE, MILA, LOCKMASTER, COLDSEAL, AVOCET, ERA, SARACEN etc as this will be very important to identify your mechanism.

(ii) Secondly you need to identify what upvc lock you have in order to source a replacement. This involves measuring the mechanism. Many mechanisms will have a small horizontal line scribed across the faceplate at its centre point, normally just above keyhole level between the central deadbolt and the spring loaded latch. Use this point to measure from. If there is no line measure from the centre of the spring-loaded latch. Make a note of the locking points on the strip and measure from the line/latch to the centre of each of them. Write these measurements down.

– Next we need to measure the backset of the lock. You do this from the inside of the door and it is a very important measurement. You measure from the front edge of the locking mechanism to the centre of the keyhole. It will normally be one of the following measurements….25mm, 28mm, 35mm, 45mm, 55mm

– The final measurement you need is what is called the centres or ‘PZ’. This is the measurement from the centre of the keyhole (Take your measurement from the centre of the ROUND part of the barrel where the key goes) to the centre of the lever handle. It will normally be either 68mm, 70mm or 92mm. Very rarely it will be 48mm, 72mm or 117mm. Note that for offset handles you need the measurement of both the inside and outside.

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