Commercial Plumbing

Black and McDonald

Toronto, Canada

Black & McDonald is one of Canada's largest independently-owned integrated multi-trade contractors, founded in 1921 and headquartered in Toronto, Ontario. With more than 5,000 employees and offices across Canada, the United States, and Bermuda, Black & McDonald provides commercial plumbing, mechanical, electrical, utility, and facilities management services for major commercial, institutional, industrial, and government projects. The company delivers full-service design, construction, and maintenance for hospitals, universities, airports, transit systems, and large commercial developments.

Comfort Systems USA

Houston, United States

Comfort Systems USA (NYSE: FIX) is a Fortune 500 mechanical and electrical contracting company headquartered in Houston, Texas, providing HVAC, plumbing, piping, controls, off-site construction, monitoring, fire protection, and electrical systems services. Founded in 1997 through the merger of 12 companies, Comfort Systems USA operates 47 operating units with 178 locations across 136 US cities. The company ranked 6th on ENR's list of top 600 specialty contractors and serves commercial, industrial, and institutional customers nationwide.

Modern Niagara

Ottawa, Canada

Modern Niagara is one of Canada's largest commercial mechanical and electrical contractors, offering mechanical contracting, electrical contracting, HVAC, commercial plumbing, piping, sheet metal fabrication, and building automation services across the country. With offices in Ottawa, Toronto, Vancouver, Calgary, and other major Canadian cities, Modern Niagara serves commercial, industrial, and institutional customers on major construction projects including cannabis production facilities, healthcare buildings, and large commercial complexes. Recognized as Canada's Safest Construction Employer.

Murphy Company

St. Louis, United States

Murphy Company is a premier national mechanical contractor founded in 1907 by John C. Murphy in St. Louis, Missouri. Family-owned for over a century, Murphy is one of the largest mechanical contractors in the United States with over 1,100 employees, regional offices in Illinois, Colorado, and Wyoming, and annual revenue exceeding $710 million. The company specializes in plumbing, pipefitting, sheet metal, HVAC, high-purity process piping, and refrigeration for commercial, industrial, institutional, and pharmaceutical clients.

NG Bailey

United Kingdom

NG Bailey is the United Kingdom's leading independent engineering and services business, founded in 1921 and family-owned. The company specializes in design, offsite manufacturing, and installation of mechanical, electrical, and plumbing solutions across the UK and Europe. NG Bailey delivers commercial plumbing for major infrastructure projects including UK airports, data centers, power stations, rail depots, higher education campuses, Transport for London's Elizabeth line depot, and battery manufacturing facilities like the UK Battery Industrialisation Centre.

SES Engineering Services

United Kingdom

SES Engineering Services is one of the United Kingdom's leading mechanical, electrical, and plumbing engineering contractors, part of the Wates Group. SES delivers commercial plumbing and full M&E services across sectors including healthcare, education, commercial offices, residential, defence, science and technology, and custodial. The company is known for its commitment to offsite manufacturing through its PRISM prefabrication facility, BIM-led design, and sustainability-focused engineering solutions for complex building projects.

Southland Industries

Garden Grove, United States

Southland Industries is one of America's largest mechanical, electrical, and plumbing (MEP) contractors, founded in 1949 and headquartered in Garden Grove, California. Southland is a full-service design-build firm offering in-house engineering, piping, sheet metal, plumbing, and pipefitting for large-scale commercial projects including offices, healthcare facilities, data centers, higher education campuses, and government buildings. The company operates across the western United States and is consistently ranked among ENR's top specialty contractors.