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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 in the Republic of Ireland 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 listed operate across the UK regardless of location. You will obtain a list of all NSI approved companies providing these services (locational search is not applicable).
Companies listed hold an NSI CerticCS approval in either the UK or the Republic of Ireland. Note: You will obtain a list of all CerticCS approved companies (locational search is not applicable)

 

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

Professional

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

Trusted

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.
Learn more
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.

Latest news

John Davidson, NSI's Approval Schemes Manager (Systems) shares practical fire safety guidance for those responsible for offices, including new COVID-19 related factors, to help ensure sites are fit for purpose. Read the full guide now on @ifsecglobal: https://t.co/3b6yjaToji https://t.co/4FJEwfNYuX
PSI Magazine - Meet the Installer June 2021
Read the latest Meet the Installer feature in PSI Magazine
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Read the latest Meet the Installer interview in @psimagazine featuring Sam Rodway of @AmbushSec #NSIapproved #SecuritySystems https://t.co/3jNSC2t9hI https://t.co/4EMasiTtyk
Entries are now open for the new Fire and Security Matters Awards 2022
Find out more and nominate your business!
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Old Trafford Fans' Invasion Puts Stadium Security in the Spotlight
Read the latest article in Football and Stadium Management in which NSI consider stadium security issues following the breach at Manchester United's Old Trafford stadium.
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NSI Re-certifications - May 2021
Congratulations to the following organisations who successfully achieved NSI re-certification in May 2021
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NSI New Approvals - May 2021
Congratulations to the following companies on achieving NSI approval in May 2021
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Why choose NSI's ACS Passport Scheme?
Find out more on NSI's ACS Passport Scheme and why it is the preferred choice for professional security providers
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Find an NSI approved company