Before contacting us you might find it useful to take a look at our frequently asked questions page; you may find the information you need there.
If you are reporting an incident involving an unlicensed security operative please go here.
If you are a journalist, please contact our Press Office.
Please follow our complaints procedure if you wish to make a complaint about our service.
For general and licensing enquiries
Security Industry Authority
PO Box 1293
Liverpool
L69 1AX
Tel: 0844 892 1025. Lines are open from 08.00 to 20.00 Monday to Friday.
Fax: 0844 892 0975
For ACS enquiries
Approved Contractor Scheme
Security Industry Authority
PO Box 49768
London
WC1V 6WY
Fax: 020 7025 4101
You can also contact us using this form.
Please note that we close for England's public holidays.