When it comes to securing your home or business, not all locks offer the same level of protection. While many people assume that any new lock will do the job, the truth is that locks vary greatly in quality, durability, and resistance to attack. From basic internal door locks to high-security external ones, every lock is designed with a specific purpose and security rating in mind.
Understanding lock grades and ratings can make all the difference between a door that simply latches and one that truly protects your property. In the UK, there are recognised standards and grading systems that help you identify which locks offer genuine security — and which might leave you vulnerable. Let’s take a closer look at the different lock standards, star ratings, and security features you should know before choosing your next lock.
Understanding Lock Grades and Ratings
Not all locks are created equal. Some locks are much more secure than others, which means you need to pay attention when choosing which lock to buy. Generally, a lock’s security is determined by its resistance to the most common burglary techniques, including picking, drilling, bumping and snapping. It also takes into account its overall physical strength. In the UK, lock and key grading systems are used to rate security, giving you guidance on which locks would be best for which doors. Generally, there are two standards used – British standards, and TS007 star ratings, which are used for euro cylinder locks.
British Standards
- BS3621: this is a widely recognised standard for high-security locks on external doors. It’s so secure in fact that it’s often required by insurance companies. They’re heavily tested against the most common burglary methods, and they’re more resistant to picking, drilling and bumping. This style of lock is key-operated from both inside and out, and any lock with this accreditation has to have passed a three-minute attack test.
- BS8621: Similar to the BS3621, but this standard includes an extra critical feature. It can be opened from the inside without a key. This makes it ideal for fire escape routes.
- British Standard Kitemark: This is a mark that shows a lock has passed the strict tests set by the British Standards Institution (BSI). It means a product has met the minimum standards of safety and quality. And it’s applied to a lot of different products, not just locks! It’s a basic requirement for quality compliance, and for insurance. If your locks don’t carry this mark, your insurance will likely be refused or invalid.
Star Ratings (TS007)
The star rating system applies to euro-lock cylinders.
- 1 Star: The most basic level of approval for security. These locks will typically have anti-pick and anti-bump features, and should protect against drilling. But it wouldn’t protect against more advanced techniques like lock snapping.
- 2 Stars: This level indicates a more enhanced protection. It’s often something that you see on door furniture like handles.
- 3 Stars: The highest level of security, usually achieved by combining the 1 and 2star components, or by including a cylinder that’s been tested for both anti-snap and other security features.
Other Security Features
Of course, there are other security features you can look for in a lock. While each lock does different things and works in a slightly different way, there are some basic extras that can make them a lot safer.
Anti-snap: An extra feature that can be added to the lock to protect against snapping efforts. Lock snapping is when the cylinder is forcibly broken to gain entry, Anti-snap reinforces against that.
Key differs: The number of key combinations that can open the lock. The higher the key differ number, the more secure the lock is and the less likely it is to be picked. For example, a grade 2 padlock will have 1,000 key differs, while a grade 3 will have 2,500, and a grade 4 will have 5,000. That means there’s 5,000 different key combinations to that lock, and only one of them will open it. So the higher the key differ, the better.
5-lever mortice locks: This type of lock is often associated with BS3621 standard locks, meaning they’re one of the more secure lock types on the market. They’re more robust, and have extra internal security components, like hard plates to resist drilling efforts.
Sold Secure Diamond (SS312): Sold Secure is an independent body, and the diamond standard is the highest level they offer. So if a lock carries this certification, you know it’s high quality and secure.
Choosing the right lock isn’t just about convenience — it’s about protecting what matters most. By understanding British Standards, TS007 star ratings, and additional features like anti-snap technology and Sold Secure certifications, you can make informed decisions that enhance your property’s safety and meet insurance requirements.
If you’re unsure which locks are best for your doors, a qualified locksmith can help you identify the right grade and standard for your needs. From high-security BS3621 mortice locks to TS007 3-star cylinders, investing in the right hardware gives you confidence and peace of mind every time you lock up.
Need advice or an upgrade? Speak to your local locksmith today — we’ll make sure your property is fitted with the right locks to keep it secure and compliant.