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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.
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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.

Latest news

The deadline for entries to this year’s Security & Fire Excellence Awards has been extended until 23 August at 23:00. This is a great opportunity to celebrate the success of teams & individuals within your company throughout the last year - don't miss out! https://t.co/3BDE9gYnQS https://t.co/tbqHR9IlW9
NSI New Approvals - June 2021
Congratulations to the following organisations
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Read the latest Meet the Installer interview in @psimagazine featuring James Twigg of Total Integrated Solutions #NSIapproved #SecuritySystems https://t.co/U4EDTbRke7 https://t.co/AVk6S4A7yA
Still time to enter Two Security and Fire Safety awards taking place this year
Enter the Women in Security and Security & Fire Excellence Awards now!
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NSI at The Security Event 7-9th September 2021: The Largest Gathering of UK Security and Fire Safety Professionals...
Register now!
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SIA Guidance for Door Supervisors
Read the latest guidance from the Security Industry Authority (SIA)
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NSI Re-certifications - June 2021
Congratulations to the following organisations
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Publication of British Standard BS 8243:2021
Find out more about the key changes to the latest revision
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Find an NSI approved company