Contact us

Contact us

Contact us

Contact us

The National Security Inspectorate is the most highly trusted and respected, not-for-profit independent Certification Body for UK providers of security and fire safety services. We regularly audit NSI certified companies to verify their ongoing compliance with relevant British and International Standards and industry Codes of Practice.

NSI & ACS Approval

E: applications@nsi.org.uk 

T: 01628 764885

Accounts & Certificates of Compliance Enquiries

E: accounts@nsi.org.uk  

T: 01628 764840

Customer Services for NSI Approved Companies

E: customersupport@nsi.org.uk 

T: 01628 764888

Marketing & Media Communications  

E: marketing@nsi.org.uk 

T: 01628 764870

Training & E-learning 

E: training@nsi.org.uk  

T: 01628 764831

Complaints Guide

If you wish to make a complaint about an NSI approved company, visit our Complaints Guide. 

Subject Access Requests

For information on Subject Access Requests, please view our Privacy Notice.

Our head office

National Security Inspectorate
Sentinel House
5 Reform Road
Maidenhead
SL6 8BY

Our registered office

Insight Certification Limited
t/a National Security Inspectorate
Sentinel House
5 Reform Road
Maidenhead
SL6 8BY
Registered in England No. 02525516
VAT No. 697 5774 56