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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

Certification Bodies NSI, ACM-CCAS & SSAIB have joined forces to offer a Code of Practice for the ‘Provision of Labour in the Security & Events Sectors’ to protect the public from rogue security workers & security workers from risk of exploitation. More:
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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Congratulations to NSI's newly approved companies who achieved approval in August 2021. A fantastic achievement, demonstrating their commitment to high standards and reassurance for their clients. More: #NSIapproved #RaisingStandards
Women in Security Awards 2021 - A Celebration of Contribution and Achievements in the Security Sector
Congratulations to all the winners and finalists at this year's Awards
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NSI at The Security Event 2021 - Three Days of Reconnection and Celebration
The event provided a welcome opportunity to reconnect and network with industry colleagues
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TalkTalk All IP Transition Webinar
NSI approved companies can register for our exclusive All IP webinar with Phil Cain of TalkTalk!
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Stadia Security Under The Spotlight
Read the latest article in Football and Stadium Management
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Migration of PSTN Telephone Lines to the Digital 'All IP' Network Update
Find out more on the latest "Stop Sell" areas published by Openreach
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NSI Re-certifications - July 2021
Congratulations to the following organisations
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NSI New Approvals - July 2021
Congratulations to the following organisations
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Publication of British Standard BS 8418:2021
The 2021 edition of the Standard for detection-activated video surveillance systems is newly published
Read More

Find an NSI approved company