Contact us
Contact us
Contact us
Contact us
Telephone: 01628 637512 or Email: nsi@nsi.org.uk
Our office opening hours are 9am - 5pm Monday to Friday
How to find us!
The National Security Inspectorate (NSI) office is conveniently located just a 4-minute drive or a 15-minute walk from Maidenhead train station.
For those driving, on-site parking is available, though spaces are limited. Alternatively, you can park at Sainsbury's* car park, situated at Providence Place, Maidenhead SL6 8AG, which is a 10-minute walk from the office.
*Please note: parking charges apply at Sainsbury's.
Have Questions About Your Application?
Book a free 15-minute call with our Application Team to discuss your application process or assess your business readiness.
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.
National Security Inspectorate
Sentinel House
5 Reform Road
Maidenhead
SL6 8BY
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