NSI - Certification for security and fire protection companies

Find an NSI Approved Company

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

Quick Search
Advanced Search

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

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

Learn more

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

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

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?

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