Are Your Locks Insurance-Compliant? A Guide to BS3621 and Security Standards
April 21, 2026Lock compliance is often overlooked until it becomes a problem. If your locks do not meet the standards outlined in your insurance policy, it can affect the outcome of a claim following a break-in.
This guide explains what BS3621 locks are, why they matter for insurance, and how to check whether your current locks meet UK security requirements. Whether you are reviewing a residential property or managing a commercial premises, understanding lock standards is an important part of maintaining security and avoiding unnecessary complications.
What Are BS3621 Locks and Why Are They Important?
BS3621 is a British Standard that applies to mortice locks fitted to external doors. It sets out strict testing criteria to ensure locks can withstand common methods of forced entry.
For properties in Leicester, insurers frequently require BS3621 locks on timber external doors as a minimum security standard.
To meet this certification, a lock must:
- Be key-operated from both sides
- Automatically deadlock when the door is closed
- Include resistance to drilling and picking
- Display the official British Standard Kitemark
These features are designed to provide a higher level of protection compared to standard locks.
Why Do Insurers Specify Insurance-Approved Locks?
Insurance providers assess risk before offering cover. Properties with stronger security measures are less likely to be targeted, which reduces potential claims.
How Do Locks Affect Insurance?
If your locks do not meet policy requirements:
- Claims may be declined
- Payouts could be reduced
- Additional conditions may be applied
This is why insurance-approved locks are commonly specified in policy documentation.
UK police guidance highlights that secure locks are one of the most effective deterrents against opportunistic crime.
How Can You Check If Your Locks Meet British Standards?
Many property owners are unsure whether their locks meet current standards. Fortunately, there are a few simple checks you can carry out.
Look For The Kitemark
Most British Standard locks include:
- A visible BS3621 marking
- The BSI Kitemark symbol
This is usually located on the faceplate of the lock.
Identify The Lock Type
Compliant locks are typically:
- 5 lever mortice deadlocks
- High-security locking systems tested to British Standards
Review Your Insurance Policy
Your policy may clearly state the type of lock required. If there is any uncertainty, it is worth confirming with a professional.
Which Doors Require BS3621 Locks?
Domestic Properties
Most insurers require:
- Front and rear external doors fitted with compliant locks
This is particularly relevant for wooden doors.
Commercial Properties
Security requirements for businesses can vary depending on:
- Building type
- Usage
- Insurance level
In many cases, compliant locks are only one part of a wider security setup.
Learn more about business security solutions on our commercial locksmiths page.
What Happens If Your Locks Do Not Meet UK Lock Compliance?
Failing to meet recognised standards can lead to both security and financial risks.
Common Consequences
- Insurance claims may be rejected
- Security vulnerabilities increase
- Insurers may require upgrades before renewal
Example Scenario
If a property is fitted with a basic lock that does not meet lock compliance, insurers may determine that adequate precautions were not in place.
This can affect whether a claim is approved.
What Is The Difference Between BS3621 and Other Lock Standards?
Understanding the differences between standards helps ensure the correct lock is installed.
BS3621 Compared To TS007
- BS3621 applies to mortice locks
- TS007 applies to euro cylinder locks
BS3621 Compared To BS8621
- BS8621 allows keyless exit from inside
- Often used where internal safety is required
Each standard serves a different purpose depending on the property and door type.
When Should You Upgrade To Meet Home Security Standards?
Lock upgrades are often necessary in specific situations.
When To Consider Upgrading
- After moving into a new property
- When locks are outdated or worn
- If insurance requirements change
- Following a break-in or attempted entry
Upgrading to meet home security standards improves both compliance and overall security.
How Can A Professional Locksmith Help?
A qualified locksmith can ensure your locks meet current standards and are installed correctly.
They will:
- Inspect your existing locks
- Recommend compliant upgrades
- Install locks to the correct specification
- Ensure alignment with insurance requirements
Correct installation is essential, as even compliant locks can fail if fitted incorrectly.
When Should You Have Your Locks Checked?
Regular checks help maintain compliance and prevent issues.
You should review your locks:
- When renewing insurance
- After moving into a property
- If locks show visible wear
- Following a security incident
Speak To A Locksmith About BS3621 Locks in Leicester
If you are unsure whether your locks meet current standards, professional advice can help you avoid potential issues.
Morgans Locksmiths provides inspections and installations across Leicester, ensuring locks meet recognised UK standards.
Call 0116 244 0338 to speak with a locksmith or visit the shop for advice.
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