The Mechanical Contractors Association of America, Inc. is a national trade association of approximately 2,500 of the nation's leading mechanical construction, service, and plumbing contractors. Member companies find value in MCAA’s programs and services, which include advocacy, education, resources, periodicals, coordination with affiliated associations and career development.

Located in the Metropolitan Washington, DC area, The Associated General Contractors of America is the leading association for the construction industry. Operating in partnership with its nationwide network of Chapters, AGC provides a full range of services satisfying the needs and concerns of its members, thereby improving the quality of construction and protecting the public interest.

The U.S. Green Building Council is a non-profit organization committed to a prosperous and sustainable future for our nation through cost-efficient and energy-saving green buildings. To accomplish this USGBC promotes and advocates for sustainable buildings, sites, practices, products, and lifestyles, through the education of professionals within the building and related industries, academia, public and private organizations, and individual members.

The National Certified Pipe Welding Bureau engages in research and educational work that will assist its member contractors in furnishing safe and dependable installations through the use of qualified Welding Procedure Specifications and qualified welders.