Approved Contractor Scheme

The Security Industry Authority (SIA) are an independent government organisation was set up under the terms of the Private Security industry Act 2001 to regulate the security industry. The SIA created the Approved Contractor Scheme (ACS) to provide a recognised hallmark of quality within the private security industry. Guarantor Security hold SIA approved contractor status for the provision of security guarding and key holding services. Guarantor Security are proud to have been one of the first Security Companies in England to have achieved this status and recognise the need for higher standards.

View our ACS Page

UKAS Quality Assurance ISO 9001

We have been assessed and approved in UKAS Quality Management Systems to the standards and guidelines BS EN ISO 9001:2015. The approved quality administration systems apply to the Provision of Manned Guarding Services in accordance with the criteria established in BS 7499 for Static site Guarding and Mobile Patrol Services, BS 7858 for Screening and Vetting of Personnel and BS 7984 for Keyholding and Alarm Response.


International Professional Security Association

The International Professional Security Association (IPSA) are a nationally recognised trade association for the Manned Guarding Services. We undergo a strict annual inspection to ensure we comply with IPSA’s own high ethical codes of conduct and in additional inspection to British Standards 7499 Code of practice for Static Guarding and Mobile Patrol Service, BS 7984 for Keyholding and Response Services and BS 7858 Code of practice for Security Screening of Personnel Employed in a Security Environment.



We are accredited within the Contractors Health and Safety Assessment Scheme (CHAS) having demonstrated compliance with and sound management of current health and safety legislation.