How to change a lock cylinder on a uPVC door in three steps

Close up of cylinder lock on door with key in lock
(Image credit: Getty Images)

How to change a lock cylinder is a handy skill that can potentially save you hundreds of pounds calling out a locksmith — especially if paying for a urgent visit. 

The barrel in a lock cylinder can become damaged or simply wear out and when this happens the lock can become difficult to operate. Alternatively, you might want to change the locks for security reasons. If you are moving house, it can be a prudent to change the locks as it is impossible to know who might have been given keys prior to you taking ownership or living in it as a rental property.

Here we tell you how to remove the old lock in a uPVC door as well as how to choose the right size lock cylinder to replace it and how to change the lock cylinder. 

Steve Jenkins

Steve Jenkins is a freelance content creator with over two decades of experience working in digital and print and was previously the DIY content editor for Homebuilding & Renovating. 

He is a keen DIYer with over 20 years of experience in transforming and renovating the many homes he has lived in. He specialises in painting and decorating, but has a wide range of skills gleaned from working in the building trade for around 10 years and spending time at night school learning how to plaster and plumb.

He has fitted kitchens, tiled bathrooms and kitchens, laid many floors, built partition walls, plastered walls, plumbed in bathrooms, worked on loft conversions and much more. And when he's not sure how to tackle a DIY project he has a wide network of friends – including plumbers, gas engineers, tilers, carpenters, painters and decorators, electricians and builders – in the trade to call upon.