Welcome to CSS, your complete specialised security company. Founded in 2000, CSS has vast experience with engineers based throughout the UK and a network of global partners allowing us to operate on a worldwide basis. Our projects range from small domestic systems to large fully integrated commercial sites, with clients including Buhler UK Ltd, Cambridge University, OMO Metropolitan and COMO Halkin Hotels, F&A, Global Holdings Management Group, HMRC, Jaguar Land Rover, KCE FM, Magrock Ltd, Orlebar Brown, Overbury, Readie Construction, Realstar, Siemens, Southbank Centre, Spire Healthcare, The Deerbrook Group, UNCLE, University of Kent and What3words 

Through our fully trained and security vetted engineers we are able to offer full project management, installation, commissioning and testing, whatever the scale of your requirements. We aim to provide our clients with complete peace of mind by giving them exactly what they want, with works carried out expertly and discreetly using the highest quality equipment that suits the clients’ needs and budget. 

We are proud to have been nominated as
Security Installer of the Year 2020
at the Security & Fire Excellence Awards held virtually in November 2020

Offering the complete spectrum

We aim to provide out clients with complete peace of mind by covering the full spectrum of security systems, including:

Intruder Alarms




Integrated Systems

Gates, Barriers & Turnstiles

Committed to quality

CSS are holders of the Gold accreditation from the National Security Inspectorate (NSI). Gold is only awarded to a company after rigorous checks have been conducted to prove technical expertise and business competence. The  Gold scheme is accredited by the United Kingdom Accreditation Service (UKAS) which is recognised by the Government, the Police, Fire & Rescue Services and the insurance industry. The National Security Inspectorate is the leading approvals and certification body that inspects companies providing home security, business security and fire safety services. By choosing an NSI approved company ensures that the contractor you select works to the highest recognised industry standards as demanded by the Police, Fire & Rescue Services and the insurance industry. NSI Gold is your guarantee you are employing an approved company. View our certificates.

BAFE (British Approvals for Fire Equipment) is the independent register of quality fire safety service providers who are certified to ensure quality and competence to help meet your fire safety obligations. View our certificate.

Alcumus SafeContractor is a leading third party accreditation scheme which recognises extremely rigorous standards in health and safety management amongst contractors. It is used by thousands of organisations in the UK including SMEs and FTSE 100 companies. CSS Systems are proud to be an accredited SafeContractor.

CHAS (The Contractors Health and Safety Assessment Scheme) was created by experienced health and safety professionals in 1997 to improve health and safety standards across the UK. They set industry benchmarks, provide assurance and reassurance, and offer best-in-class services that are easy to use and cost effective.


In addition, all our engineers are accredited to install and maintain, amongst many others: