Skip to content
1 / 5
1 / 5

Select Approval

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.

Search Type

Service Options

Note: locational search is unavailable


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.
Learn more
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.
Learn more
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.
Learn more

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

Congratulations to NSI's newly approved companies who achieved approval in April 2021. A fantastic achievement, demonstrating their commitment to high standards and reassurance for their clients. More: #NSIapproved #RaisingStandards
NSI New Approvals - April 2021
Congratulations to the following companies on achieving NSI approval in April 2021
Read More
NSI’s ACS Passport Scheme is the 1st choice of professional security companies looking to integrate @SIAuk ACS with compliance to British Standards in the Guarding sector. NSI serves an elite of 100 NSI Guarding Gold service providers across the UK. More:
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
Read More
Banham Security announced as first ECHO-connected Alarm Receiving Centre
Read the full announcement here
Read More
The Risk Management Safety Net: Standards and Codes of Practice
Read Richard Jenkins' latest article in City Security Magazine on risk management and the importance of standards and codes of practice.
Read More
On Inspection
In the third instalment of 'On Inspection' with Security Matters Magazine, Richard Jenkins discusses the developing standards across the security industry.
Read More
NSI to Host Cyber Essentials Webinar: 'Cyber Essentials Certification - Not Just a Tick Box'
NSI to Host Cyber Essentials Webinar in partnership with Risk Crew, an IASME-accredited Cyber Essentials Certification Body. Register now.
Read More

Find an NSI approved company