Police Warning Highlights Security Risks of Magnetic Door Locks

Businesses and property managers are being urged to review their security arrangements following a police advisory highlighting vulnerabilities associated with magnetic locking systems, commonly known as "Mag Locks".

The warning comes after City of London Police identified an increase in burglary incidents where offenders have exploited weaknesses in magnetic lock installations to gain unauthorised access to commercial premises. In several reported cases, thieves entered buildings and stole laptops, mobile phones and other valuable items left within offices and shared workspaces.

Understanding the Risks of Magnetic Locks

Magnetic locking systems are widely used as part of access control solutions because they can provide convenient and effective door security. However, when incorrectly specified, poorly installed or used in inappropriate locations, they can present security vulnerabilities that may be exploited by criminals.

According to police crime prevention specialists, magnetic locks should not be viewed as a standalone security solution, particularly when installed on external or ground-floor access points.

Common Weaknesses Identified by Police

Investigations into recent burglary incidents have identified several recurring weaknesses associated with magnetic locking systems.

These include:

• Magnetic locks relying entirely on electrical power, meaning the lock releases if power is interrupted.

• Poor installation or inadequate fixing points that allow doors to be forced open.

• The use of low-quality or non-certified locking products.

• Door flexing, particularly where magnetic locks are fitted at the top of doors, allowing gaps to form when force is applied.

• Emergency release buttons or break-glass units being accessible to intruders.

• Lost, stolen or poorly managed access control cards and credentials.

• Internal-grade magnetic locks being installed on external doors where greater resistance to attack is required.

While magnetic locks remain suitable for many applications, understanding these vulnerabilities is essential when assessing building security.

Reviewing Physical Security Measures

Police are advising organisations to review their physical security arrangements and assess whether additional measures may be required to protect external access points.

For premises that rely heavily on magnetic locking systems, introducing a secondary locking mechanism outside normal operating hours may provide an additional layer of protection. Any additional security measures should be selected carefully and installed in accordance with relevant British Standards, fire safety requirements and building regulations.

A layered security approach is often more effective than relying on a single security measure.

The Importance of Secured by Design Standards

Building owners and facilities managers are also encouraged to consider the principles of Secured by Design (SBD), the official police security initiative that promotes crime prevention through effective building design and security standards.

Following Secured by Design guidance can help organisations identify potential vulnerabilities and implement measures that make premises more resistant to criminal activity.

Additional security controls such as monitored intruder alarms, CCTV systems and effective access management procedures can also help deter offenders while supporting incident detection and investigation.

Taking a Proactive Approach to Security

Physical security threats continue to evolve, making regular reviews of security systems and procedures essential for businesses of all sizes.

By assessing existing door security, reviewing access control arrangements and ensuring security systems are fit for purpose, organisations can reduce vulnerabilities and strengthen protection against opportunistic and targeted criminal activity.

For organisations seeking further guidance, City of London Police and Secured by Design resources provide valuable information on improving physical security and reducing the risk of burglary.

If you would like further information regarding the advisory, the City of London Police Multi Agency Prevention Team can be contacted at DOCO2@cityoflondon.police.uk.