Achilles, Building Confidence

CHt has been accredited with Building Confidence since 2008, giving our external clients further assurance that our systems go above and beyond industry standards. Building Confidence is the construction standard providing certification to the Common Assessment Standard (CAS), putting the community at the forefront of standards in the UK.


CHt is extremely proud to have been one of the founding members of BESA (The Building Engineering Services Association) formerly known as the Heating and Ventilating Contractors’ Association (HVCA) over 100 years ago.


CHt has a long standing heritage with the Building Services Research and Information Association (BSRIA) and are proud to have been founding members back in 1955. BSRIA is an ISO 9001 Registered test, instruments, research and consultancy organisation, providing specialist services in construction and building services.


CHt is accredited with ISO 9001- Quality Management | ISO 45001 - Health & Safety | ISO 14001 - Environment Management | ISO 50001 - Energy Management Systems

Carbon and Energy Management and Reduction Scheme (CEMARS)

CEMARS is a greenhouse gas measurement and reduction scheme provided by Achilles for large organisations (or large emitting industries) to measure and support reduction of their greenhouse gas emissions.


CHt is fully accredited to the Contractors Health and Safety (CHAS) and Safety Schemes In Procurement (SSIP), one of the founders of third party accreditation who set industry benchmarks, provide assurance and reassurance, and offer services that are easy to use and cost effective.

Constructionline Gold

CHt has been Constructionline accredited since 2009, giving our clients the confidence that our systems and procedures are fully verified and accredited to the highest standards.

National Security Inspectorate (NSI).Pdf#Search=Nsi

Experts in Security and Fire Safety

NSI approval is a highly respected and trusted hallmark in the security and fire sectors, demonstrating technical expertise and a reassuring quality of service.

Gas Safe

CHt has been members of Gas Safe and previously Corgi for decades, Gas Safe Register is the official gas registration body for the United Kingdom, appointed by the relevant Health and Safety Authority for each area.


CHt has a long standing relationship with the National Inspection Council for Electrical Installation Contracting. The NICEIC provides assessment and certification services for contractors working across the building services sectors, assessing and providing certifications for electricians and renewable energy installers.

Responsible Sourcing Of Construction Products (BES6001)

​Responsible Sourcing of Construction Products provides a holistic approach to managing a product from the point at which component materials are mined or harvested, through manufacture and processing.

Safety Schemes In Procurement (SSIP)

SSIP operate a robust and consistent Deemed to Satisfy (DtS) agreement between SSIP member schemes that is clear and transparent.