The National Security Inspectorate (NSI) is recognised as the leading certification body for the security and fire protection sectors in the UK.

For over 40 years, the NSI have helped protect security industry businesses by providing robust, high quality audits of business security and fire safety service providers. Businesses who choose NSI approved companies have the reassurance that their chosen contractors will work to the highest industry standards demanded by the Police, Fire and Rescue Services and the insurance industry.

All audits are carried out to ISO 9001 standards and procedures.

The NSI Directory lists all the companies who have successfully achieved NSI certification.