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NSI Gold: NSI approved companies compliant with NSI’s Gold Approval Criteria, NSI’s Regulations, NSI’s Quality Schedule, the ISO 9001 Quality Management System standard and defined technical standards.

NSI Silver: NSI approved companies compliant with NSI’s Silver Approval Criteria, NSI’s Regulations and defined technical standards.

CerticCS: NSI approved companies compliant with specific PSA standards and/or the ISO 9001 Quality Management System standard.

SIA ACS: Security Industry Authority Approved Contractors assessed by NSI.

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Companies providing these services operate across the UK regardless of location. By selecting one of these services locational search options are unavailable.


Latest news

RT @CitySecuritymag: Winter edition out soon: thank you for 2021 security insights from leaders in security organisations: Mike Reddington…
ECHO Announces Successful End to End Testing of New Automated Alarm Signalling Service
Read the latest ECHO (Electronic Call Handling Operations) update
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Register now to join NSI's Head of Field Operations (Systems) John Davidson on the Chartered Association of Building Engineers webinar on 2 Dec at 11am, discussing recent changes & updates to fire safety standards incl BS 8629 for Evacuation Alert Systems:
NSI New Approvals - October 2020
Congratulations to the following organisations
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BSIA Spectrum - A Blended Approach
Read the full article here
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PSI Magazine - Meet the Installer October 2020
Read the latest Meet the Installer interview featuring Synectics Security (trading style of Quadrant Security Group Limited)
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Look out for the NSI hallmark

It’s the most widely recognised mark of approval in security and
fire safety. NSI approval tells you the company is:


Technically Competent

Working to International and British Standards and NSI Codes of Practice, teams have relevant technical experience


Gold approval - operating a Quality Management System to ISO 9001 and NSI Quality Schedules


Reputable Directors & leaders with relevant business experience and effective employee security screening

Young family returning to a safe and secure home
Home security and fire safety you can trust
As a householder you want to be sure your security and fire safety providers are trustworthy with the knowledge to translate your needs into a solution that is right for you.
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Protecting the workplace
Protecting the workplace
Security and fire safety in your workplace are of the utmost importance. NSI approved companies ensure peace of mind whether installing a fire or intruder alarm, CCTV system, servicing your fire extinguisher or providing door supervision.
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NSI approved companies keep up to date with the latest developments in standards and codes of practice for the benefit of their customers.
NSI approved companies
Approved companies keep up to date with the latest developments in standards and codes of practice for the benefit of their customers.
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Looking for NSI approval?
Looking for NSI approval?
Independent, regular assessment by NSI's expert team of auditors demonstrates your company is compliant with British and International Standards and relevant Codes of Practice, providing reassurance for your clients.
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Over 1800 approved companies subject to annual NSI audit.

Over 2.75 million Certificates of Compliance for security and fire safety installations issued by NSI approved companies.

National Network of expert security and fire safety auditors.

Find an NSI approved company