Accreditations and Memberships

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SIA ACS (Approved Contractor Scheme)

The Approved Contractor Scheme (ACS) provides a recognised hallmark of quality within the private security industry. ACS companies are rigorously assessed against 78 performance indicators across seven essential criteria; helping you to make decisions that are based on quality and value. City Security Services are proud to be a part of the SIA ACS. Copy of certificate available here

NSI Gold

NSI approval is a highly respected and trusted hallmark in the security and fire sectors, demonstrating technical expertise and a reassuring quality of service. City Security Services is a Gold certified company with our scope of accreditation covering ISO 9001:2015, BS 10800, BS 7499, BS 7858 and BS 7984.


Tens of thousands of buyers rely on the Constructionline platform to identify suppliers. City Security Services is proud to be a Constructionline member and supplier of choice for Security Guarding and related services.


SafeContractor is trusted by the world’s most respected organisations to make them safer, healthier and stronger. City Security Services is one of those companies putting employees safety first.


With over 70 years’ experience in the industry, the FPA have become the UK’s leading fire safety organisation and City Security Services is a proud member.

ACS Pacesetters

The ACS Pacesetters membership is made up of Contract Security Guarding Companies who are in the top 15% benchmarking and achievement levels set by the Security Industry Authority Approved Contractor Scheme. See us on the ACS Pacesetters website here


The Royal Society for the Prevention of Accidents (RoSPA) is a British charity that aims to save lives and prevent life-changing injuries which occur as a result of accidents. City Security Services are proud to be associated with RoSPA.

City of London Crime Prevention Association

We are proud to be members of this prestigious Association. The City of London Crime Prevention Association has been in existence for more than 40 years and facilitates a network of likeminded Security professionals. It is a partnership between the City of London Police, the wider security community and all those involved with safety, security and emergency response.

The City Security Council

The City Security Council is a collective of premier security companies based in the City of London that works in collaboration with the City of London Police and City of London Corporation to help support them in times of crisis or any significant major event that takes place in the City. The council’s strategy aims to ensure the highest levels of Detection, Prevention, Deterrence and Response.