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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

On 3 November at 11:00 John Davidson, NSI's Approval Schemes Manager (Systems) will be joining industry colleagues in a panel discussion on Competency Culture in the Fire Safety Industry at the new Fire Safety Matters Live digital conference. Register now!
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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Congratulations to those organisations who successfully achieved their NSI re-certification in September 2021, signifying their ongoing commitment to quality and continual improvement. See the full list here: #NSIapproved #Security #FireSafety
ECA Industry Awards 2021: NSI Approved Companies Recognised for FSA Best Fire & Security Project Award
Find out more
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NSI New Approvals - September 2021
Congratulations to the following organisations
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How intruder alarms can now better protect retailers
The revisions to BS 8243:2021 provide greater choice for retailers in protecting their premises. Find out more here
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Register now to attend our free SIA Approved Contractor Scheme Workshop
Learn more about the SIA ACS scheme and the application process
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NSI Re-certifications - August 2021
Congratulations to the following organisations
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NSI Approved Company Preparations for the PSTN to Digital All IP Migration
Find out more about the preparations required for the All IP communications transition
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Certification Bodies Join Forces To Support Industry Fight Against Rogue Labour
NSI, ACM-CCAS and SSAIB join forces to support industry in fight against rouge labour in the security and event sectors.
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On Inspection Issue 4
Read the latest instalment of On Inspection in Security Matters
Read More

Find an NSI approved company