The transaction will strengthen NAPIT’s commitment to continuously raise standards and safety within the construction industry and Stroma’s aim to focus on their core areas of service around environmental management, building performance testing and building control.

NAPIT’s group chief executive, Mike Andrews, said: “NAPIT has always been committed to continuously raising standards within the sector. We are confident that the acquisition of the installer activities part of the Stroma Group will result in a stronger and more robust Registration and Certification Body for the industry.

“This opportunity will bring together the best of what both organisations have to offer, alongside our combined experience, which will enable us to take the business forward in new and exciting ways for both our members and employees.”

Over 3,500 existing Stroma Certification members will continue to be UKAS accredited under a new certification body named Stroma Installer Certification Limited.

Martin Holt, Stroma’s group chief executive, said: “NAPIT have a strong reputation within the building services industry and we’re confident that their passion and commitment to safety and certification will ensure our members and consumers receive an excellent service.

“The Stroma Group will continue to deliver market-leading certification and training for energy assessors in addition to driving safety and compliance throughout the built environment via Stroma Building Control and Stroma Built Environment.”

The terms of the transaction will not be released and will remain confidential between both parties.