uPVC Lock Replacement & Adjustments

There are a number of reasons why a uPVC door or window lock will fail and need repairing or replacing. You may be able to fix the problem or you may need a lock replacement.

Contact us today for a professional affordable quote.

Mortice Locks

Mortice deadlocks are one of the most common type of locks referred to in an insurance policy. A mortice lock requires a key to both lock and open it. Your home insurer may ask that it complies with British Standard BS3621. We can repair and replace any type of mortice deadlock fitted to any style of uPVC door.

Key-Operated Security Bolts

Commonly used on external doors, including French and double doors. Your policy may specify that key-operated security bolts should be fitted to the top and bottom of the door.

Can be surface-mounted or fitted into the door
For French and double doors these should be fitted to the final closing door and positioned vertically
Surface-mounted bolts are only as strong as the screws which hold them in place
A mortice bolt is more secure than a surface mounted bolt. If the key is removed, the bolt cannot be opened or easily manipulated


You may know these as ‘secondary locks’. In general, they come in two forms: standard nightlatches and deadlocking nightlatches.

Standard – locks the door automatically unless you use the snib to hold the latch back
Deadlocking – locks automatically and needs a key to open the door from inside and outside
Deadlocking latches are more secure
Extra security – should not be sole lock on the door

Anti-Snap Lock Cylinder

Cylinder locks are a common type of lock found on doors. You would need to check with your home insurer whether this type of lock is acceptable as some types of cylinder locks are vulnerable to a technique known as lock snapping.

Internal and external use
Easy to install
UPVC and composite friendly
Check lock for Kitemark or ES symbol

Multi-Point Locking Systems

Multi-point locking systems are now commonly used and are found mainly on UPVC doors. A multi-point locking system has a minimum of three locking points that all lock simultaneously with the turn of a key.

External use, garage and patio doors
Minimum three locking points
Locks using hook bolts, camrollers or pins
All points lock simultaneously


Our Promise

We give all of our customers a 10 year guarantee on any units we install so that you have the utmost confidence in our products and service. It is our promise to you.

The Best Security & Energy Efficiency

All of our windows and doors pass the Secured by Design police accreditation scheme and BFRC standards ensuring we keep your property safe and secure and energy efficient.


"Friendly staff. Fantastic. Really looked after us and a great price. Thanks Guys."
"I'd like to say a big thank you to Campbell & Dumville for the excellent job that you have done of my windows and doors. The door looks superb and we have had many compliments about it. Thanks."
"Just a few words to say thanks for the clean and efficient way you carried out my job. When i came home from work it was a great surprise to be able to just sit down and enjoy my new home rather than cleaning. Thanks for your help."