British Standard

You may be required by your insurance company to fit your "final exit" doors with at least one lock that complies with British Standard BS 3621. This could be either a nightlatch, deadlock or sashlock.

If you fit the wrong type of lock or locks to your final exit doors, you risk invalidating your insurance policy. We strongly urge you to consult with your insurance company carefully before fitting your house with new locks.

British Standard

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