The Importance of BS3621 Certified Locks

The Importance of BS3621 Certified Locks

The Importance of BS3621 Certified Locks


If you’re a locksmith, the chances are that you’ve heard of BS3621, but you may not know too much about it and if you’re a homeowner, you’ve likely never heard of this certification! BS3621 is a hugely important certification within the lock industry though and something which insurance companies look for if you want to get coverage for your home, as well as ensuring that your property is secured to a higher level.


The BS3621 certification is controlled by the British Standards Institution (BSI) who were founded almost 120 years ago, in 1901 as the Engineering Standards Committee. BSI set out to ensure that services and products meet the expectations of quality, safety and reliability and you will have no doubt seen the famous BSI kitemark logo on a number of products, including many household items such as plugs and fire alarms.


What is BS3621?


BS3621 is one of the most important certifications within the lock industry and it covers mortice deadlocks and sashlocks, Euro deadlocks and sashlocks and rim cylinder locks, such as nightlatches and rim locks. 


What makes a lock BS3621 certified?


There are a number of things which locks must have to pass the BS3621 certification and for mortice locks, these are;


  • The lock must have at least 5 levers

  • The screws which fix the lock to the door must not be accessible when the door is shut

  • The lock must be covered by a hardened metal plate in order to protect from drilling

  • When the door is locked, the bolt must protrude by at least 20mm

  • When activating the lock, the bolt must be completely activated before the key can be removed


The APECS LX5 deadlock covers all of these five requirements and that is why it has passed the BS3621 certification standards. 


How do I tell if a lock is BS3621 certified?


The easiest way to tell if a lock is BS3621 certified is to look for the kitemark logo. This kitemark logo looks like a heart with an S making up the centre of the heart and a B flat along the top. This kitemark logo should be on the faceplate of the lock and will be very easily noticeable.


The type of door you have will also help in identifying whether you have a BS3621 lock. If you have a door which is made of wood, then you are likely to have a BS3621 type of lock in there. If you have a uPVC or composite door, then you will not have one of these locks, and you will likely have a euro-cylinder, such as our AP or XS cylinder. 


uPVC doors are covered by PAS24 which is the equivalent certification for these types of doors. These doors are secured by multipoint locks combined with euro-cylinders. Our partnership with Ingenious Locks & Hardware (ILH) has seen us combine our KM 3*, Sold Secure Diamond Grade AP cylinder with the ILH Duplex lock. The ILH Duplex lock has passed PAS24 testing, which means that the door can withstand a range of the most common types of attacks to help prevent unauthorised access. 


Why is having a BS3621 certified lock important?


First and foremost, having a BS3621 certified lock is important for home security. These locks have met the requirements needed by the BSI and therefore they should make your home more secure. With security elements such as no screws being visible when the door is locked, hardened metal covering the outside of the lock and the 20mm bolt, all of these things make it much harder for a burglar to gain entry to your house.


The other important thing about BS3621 certified locks is home insurance. Many home insurance companies will require a BS3621 certified lock on your external downstairs doors as a minimum to offer home insurance and although having a certified lock may not bring your premiums down, not having a certified lock could prevent you from getting home insurance. 


Which locks are BS3621 certified?


After having read all of that, you’re probably wondering which locks have received the BS3621 certification. Our APECS LX5 Deadlock is a 5-lever mortice lock which is BS3621 certified, making it a great choice for timber doors.


If you’re a locksmith looking to swap out an existing industry standard 5-lever mortice lock for an insurance approved one, then our LX5 lock is the perfect choice for you. The LX5 fits into the same footprint as industry standard locks, making it a quick and easy retrofit upgrade with no need for extra carpentry. 


To purchase one of our LX5 locks, you can either go through SKS, Davenport Burgess or contact Natasha directly at or on 02073499888.


13 February, 2020

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Mark Grainger - Director Abbey Locks & Security

Mark Grainger - Director Abbey Locks & Security

"Their 3-star cylinder range has become our go-to product to offer homeowners and the quick turn-around on orders has been a big help to our business"

13 December, 2021
Nigel Hutchinson - Managing Director ILH

Nigel Hutchinson - Managing Director ILH

"Working with APECS has been great. They are both friendly and professional to deal with and all of the products we have used have been of the highest quality."

24 April, 2019