Guide to door lock types

Cunliffe Windows and Doors, Orrell, Wigan

Mortice Locks

Mortice deadlocks are one of the most common type of locks referred to in a 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.

External use, harder to break design

Check for the Kitemark symbol

Check for at least five levers marked on face plate


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

Multipoint Door Locking System

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

Cylinder Door Locks

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

We install many different types of door locks.

 We carry a comprehensive range of Door Locks & Bolts, ideal security options for uPVC and wooden doors, home or industrial, for use internally or externally, whether you are looking for privacy around the home or enhanced defense against break in’s & theft for your properties. Insurance approved products are available and many with multiple keys. Kite marked and certifire approved products are also stocked in this range, meaning the products you have to choose from have been tested to the highest standards.

Phone us for more information

Phone us for more information. We are available 7 days a week.

Service and installation: David Cunliffe
Customer services : Jenny Cunliffe