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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.


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@julianharrison2 NSI Gold companies meet the industry’s highest technical standards plus an ISO 9001 Quality Management System & work to NSI’s unique Quality Schedule. NSI Silver companies only meet the technical requirements. Our Applications Team would be happy to assist
NSI New Approvals - December 2020
Congratulations to the following organisations
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RT @ifsecglobal: Engineers of Tomorrow 2021: Registration live! The highly regarded IFSEC Engineers of Tomorrow competition is back for 20…
IFSEC & FIREX Tech Talks: Registration now live!
Hear from leading suppliers about the latest developments
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PSI Magazine - Meet the Installer December 2020
Read the latest Meet the Installer interview featuring Astra Security
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High Alert
Read more in the latest edition of Fire & Risk Management
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Fixing Weak Links in Security Staff Supply
Read Richard Jenkins' latest article in HEFMA Pulse
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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.
Learn more
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