Are Your Locks British Standard and insurance approved ?

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By looking at your locks you might see the British standard logo some locks have the stamp on the side of the lock which is hidden. Having a British Standard lock gives you the customer more security than a standard lock which helps with your insurance. Most insurance companies will have some details or wording about the locks need to be a British Standard to your home. According to and, some insurance providers will give the customer a discount on their home insurance premiums if they have British Standard locks installed. Other insurers will insist that you have a five-lever mortice lock conforming to BS3621 on all exit doors along with key-operated locks on the ground floor and accessible windows to qualify for cover. So Check your insurance documents to be sure.


Only your external doors (not internal doors) need to be BS certified

BS3621  ⁄  BS8621  ⁄  BS10621 – What Does It Mean?

Along with the British Standard kite mark, a lock that conforms to the required British Standards will display the numbers of the standards it has passed. The numbers above are the most common, domestic locks will usually show BS3621.

  • BS3621 – The BS3621 standard is relevant to mortice and cylinder rim locks where a key is used on both sides of the lock. As long as the key is removed from the lock, this lock is secure against intruders that try to operate the lock by reaching through a letterbox or breaking glass nearby.
  • BS8621 – The BS8621 standard is relevant to locks that need a key for entry but not for exit. These locks are often seen in blocks of flats or apartments that use a key on the outside of the door and a thumb turn on the inside. This lock allows emergency escape without the use of a key at all times.
  • BS10621 – The BS10621 standard is relevant to locks that can only be locked by a key from the outside. The locks can be opened from inside without the use of a key unless the function has been disabled by the positive use of a key from outside. These locks are best used on properties with another route of escape.

Who can help ?

Once you have checked your locks & documents or spoken to your insurer if you require one our our locksmiths to attend and change your locks give us a call.