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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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Service Options

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)


NSI Gold and Silver Medals - Signifying a companies approval with NSI

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 2000 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

Season's greetings to #NSIapproved companies and all those working in the security and fire safety sectors! From all at NSI, we wish you a safe Christmas and a happy, healthy New Year. NSI will be closed over the festive period from 25 December 2021 - 3 January 2022 inclusive.
Congratulations to NSI's newly approved companies who achieved approval in November 2021. A fantastic achievement, demonstrating their commitment to high standards and reassurance for their clients. More: #NSIapproved #RaisingStandards
NSI New Approvals - November 2021
Find out who has a new approval with NSI
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Thoughts on security in 2022 and beyond - Richard Jenkins, NSI CEO
Read Richard's comments in the latest edition of City Security magazine
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Updated British Standard For Detector-Activated Surveillance Strengthens Stadium Security
The Standard recognises evolving technology and introduces a number of key changes
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Code of Practice (NCP 109) Supports Safe Care Homes
Read the article in Care Home Management magazine by NSI's Chief Executive
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On Inspection Issue 5
Read the latest instalment by Richard Jenkins, NSI Chief Executive, in Security Matters magazine
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Winners Revealed for WorldSkills and Engineers of Tomorrow Competitions 2021
Find out who this year's winners are
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WorldSkills UK National Finals Medal Ceremony Live Broadcast on 26 November: Security Apprentice Winners to be Ann...
Watch the ceremony to find out who the Gold, Silver and Bronze winners are
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Security & Fire Excellence Awards 2021: NSI Approved Companies Recognised for Outstanding Achievements
Find out more here
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Publication of NSI Code of Practice for Intruder Alarms NCP 120 (Replacing NACP 11)
Replacing NACP 11 for all NACOSS Gold and Systems Silver
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Understanding your fire safety responsibilities
Read the article in First Voice magazine by NSI's Approval Schemes Manager
Read More

Find an NSI approved company