Contact Us

Christmas Opening Hours

General and Licensing Enquiries

  • Open: 22, 23, 24, 29, 30, 31 December and 2 January from 08.00 to 17.00
  • Closed: 25, 26 December and 1 January.

ACS Enquiries and Business Support

  • Open: 22, 23, 29 and 30 December from 09.00 to 17.00; 24 and 31 December from 09.00 to 14.00
  • Closed: 25, 26 December and 1 January.

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.

Please note that we close for England's public holidays.

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

Use our enquiry form

ACS Enquiries

Approved Contractor Scheme
Security Industry Authority
PO Box 49768
London
WC1V 6WY

Fax: 020 7025 4101
E-mail: acsenquiries@sia.gsi.gov.uk

Our Head Office Address

Security Industry Authority
PO Box 49768
London
WC1V 6WY