British Standard Locks Explained
BS3621 is the UK security standard most home insurers require on final exit doors. Here's what it actually means.
What BS3621 covers
A British Standard mortice lock or night latch meeting BS3621 has been tested for resistance to drilling, picking and forced attack to a defined level.
How to tell
Look for the BSI Kitemark stamped on the faceplate of the lock — the curved 'kite' logo. No mark, not BS3621.
uPVC equivalents
uPVC doors don't use BS3621 mortice locks — they use multi-point mechanisms with euro cylinders. Look for 3-star anti-snap cylinders (TS007) instead.
Need a Bristol locksmith now?
Call 0330 1335923 for fast, local help, 24/7.