British Security Technologies: Home and Business Security Specialists since 1991

NSI (NACOSS) GOLD Approved Installer

The National Security Inspectorate is the specialist approvals and certification body that inspects companies providing home security, business security and fire safety services. Choosing an NSI approved company ensures that the contractor you select works to the highest recognised industry standards as demanded by the Police, Fire and Rescue Services and insurance industry.

As a UKAS accredited certification body, NSI approves companies providing quality solutions across the security and fire sectors including :

•             electronic security systems - intruder alarms / burglar alarms, cctv, access control

•             fire detection and alarm systems

•             manned security / keyholding services

NSI is a Security Industry Authority (SIA) Assessing Body for the Approved Contractor Scheme (ACS).


NACOSS Gold is NSI's premier scheme for electronic security systems companies wishing to meet the industry's highest standards.

Companies approved to this scheme must achieve business excellence through ISO 9001:2000 Quality Management System Standard as well as achieving a long-term track record of performance and evidence of reliability and stability.

NACOSS Gold approved companies install and maintain intruder alarms, personal attack alarms, CCTV and access control.


NACOSS was formerly an inspectorate that solely approved companies involved in the installation and maintenance electronic security systems and alarm receiving centres (ARC).

In 2001, NACOSS merged with the Inspectorate of the Security Industry (ISI), which offered voluntary inspection services to the manned security sector, to form the National Security Inspectorate (NSI).

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Areas Covered:

Barking and Dagenham, Barnet, Bexley, Brent, Bromley,Camden, City of London, City of Westminster, Croydon, Ealing, Enfield, Greenwich, Hackney, Hammersmith and Fulham, Haringey, Harrow, Havering, Hillingdon, Hounslow, Islington, Kensington and Chelsea, Kingston, Lambeth, Lewisham, Merton, Newham, Redbridge, Richmond, Southwark, Sutton, Tower Hamlets, Waltham Forest, Wandsworth.

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