BPI is a non-profit organization that develops standards and provides credentialing for building performance professionals and companies. It oversees the certification of individuals in areas like building auditing, mechanical systems, and envelope work. It also accredits companies that commit to using whole-building performance approaches. The process involves training, exams, quality assurance checks, and ongoing compliance. BPI has credentialed over 10,000 professionals and 500 companies to help improve industry standards and prioritize customer safety.