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.

Click here to schedule your call

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