About us
About us
About us
About us
Protecting UK homeowners and businesses for over 50 years
The National Security Inspectorate is the UK's most highly trusted and respected, independent, UKAS-accredited certification body in the security and fire safety sectors.
As a not-for-profit organisation helping to protect homeowners, businesses, the public sector and the general public, we count premium local providers, as well as the UK's premier national security and fire safety providers amongst our clients.
Our mission is to secure the highest standards of safety and security for buyers of commercial and domestic fire and security systems, guarding and security services, through independent, third party audit and certification in the UK and Eire.
Independently approved companies you can trust
Each year our expert, in-house team of auditors conduct over 3700 assessments of 2000+ NSI approved companies to verify compliance with relevant British and International Standards and industry Codes of Practice.
NSI approved companies are committed to the highest standards of service, quality and continual improvement.
By choosing to contract an NSI approved company, you can be assured of their integrity, technical expertise and professionalism as recognised by the Police, Fire and Rescue Services and the insurance industry.
Look out for the NSI hallmarks
An NSI Certificate of Approval demonstrates an organisation operates in accordance with recognised industry standards for the services as listed in the NSI Company Finder.
Every NSI approved company operates a Quality Management System or business operating system and its board of directors has been screened. It also operates in accordance with NSI Regulations for Approved Companies, as well as relevant standards, through an ongoing programme of independent audits.
NSI is accredited by the United Kingdom Accreditation Service (UKAS)
UKAS accredits bodies such as NSI who operate certification schemes in accordance with International Standards for Accredited Certification i.e. ISO/IEC 17021-1:2015 (management systems certification) and ISO/IEC 17065:2012 (product conformity certification).
Insight Certification Ltd trading as National Security Inspectorate (NSI) is accredited by the United Kingdom Accreditation Service (UKAS), which operates under a Memorandum of Understanding with the UK Government through the Department for Business, Energy and Industrial Strategy.
Key milestones in our history
Learn more about NSI
Find an NSI approved company