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.​

In partnership with the Association of London Government (ALG), CHAS was a key developer of the core criteria held in the Approved Code of Practice which supported the Construction (Design and Management) Regulations 2007 (now recogonised as CDM 2015) and is a founder member of SSIP (Safety Schemes in Procurement). As one of the founders of third party accreditation we are not only a trusted advisor on health and safety compliance, we are an authority. We set industry bench​marks, provide assurance and reassurance, and offer best-in-class service​​s that are easy to use and cost effective.

This health and safety legislation was created to achieve the following aims:

To simplify health and safety contractor assessment by standardising requirements.
To allow companies to avoid undergoing health and safety assessments for every job.
We have more than 900 public and private sector client organisations and 70,000 contractors registered on the CHAS database.