Back to Blog
June 15, 2026|Locksmith Insights

Why British Standard BS3621 Locks Are Essential for Surrey Homes

When it comes to securing your home, not all locks are created equal. Burglars are constantly finding new ways to bypass old lock cylinders, making it crucial to have robust security barriers. In the UK, the gold standard for residential door security is the British Standard BS3621. If you own a home in Surrey, understanding and installing BS3621 locks is essential for protecting your property and complying with home insurance requirements. Here is everything you need to know about these high-security locks.

What is a BS3621 Lock?

A lock that meets the British Standard BS3621 has been rigorously tested against common burglar entry methods, such as drilling, picking, sawing, and force. You can easily identify these locks by looking at the faceplate (the metal part of the lock visible when the door is open). It must display the British Standards Institution (BSI) Kitemark symbol along with the code 'BS3621'.

Why Are They Essential for Surrey Home Insurance?

Most home insurance providers in Surrey specify that your main perimeter doors must be fitted with British Standard BS3621 locks. If your home is burgled and you do not have BS3621 locks installed on your external doors, your insurance company may refuse to pay out your claim. By installing these locks, you satisfy insurance requirements and can even reduce your annual premiums.

Key Security Features of BS3621 Locks

BS3621 locks are built with specific defensive mechanisms that set them apart from standard cylinders:

  • Hardened Steel Plates: These prevent intruders from drilling through the lock mechanism.
  • Anti-Pick Technology: The internal pins are designed to resist manual picking tools.
  • Bolt Protection: The deadbolt must protrude at least 20mm when locked, and it contains steel rollers that spin to resist sawing.
  • Key Retention: Many BS3621 locks prevent the key from being removed unless the bolt is fully thrown, ensuring you don't accidentally leave your door unlocked.

How Surrey Shield Locksmiths Can Help

Are your current locks insurance-compliant? Many homeowners in Surrey are unaware that their front and back doors are fitted with outdated, vulnerable locks. At Surrey Shield Locksmiths, we provide comprehensive home security surveys. We can inspect your locks, verify BSI compliance, and supply and fit brand-new, insurance-approved BS3621 locks on the spot.

Don't compromise on your home security. Contact Surrey Shield Locksmiths today on 07747272304 or drop us a message on WhatsApp. Let's make your Surrey home a secure fortress.

Need a Trustworthy Locksmith in Surrey?

Surrey Shield Locksmiths are DBS checked, fully insured, and City & Guilds certified. We arrive in 20-30 minutes with no call-out fees.

Other Helpful Guides

June 20, 2026
How to Choose a Locksmith in Surrey: 5 Things You Must Check

Finding a trustworthy locksmith in Surrey can be challenging. Here are 5 critical things you must check before hiring, from DBS checks to certifications.

Read Post →
June 18, 2026
Locked Out in New Malden? Here's What To Do

Being locked out of your home is stressful. Follow our step-by-step guide on what to do if you get locked out in New Malden, including costs and expectations.

Read Post →