Limbach Holdings, Inc. provides building infrastructure services. It operates in two segments, Construction and Service. The company engages in the design, installation, and maintenance of HVAC and mechanical, electrical, and plumbing systems for various groups of commercial and institutional building owners. Its products include mechanical, plumbing, air conditioning, heating, building automation, electrical, and control systems. The company serves customers in various markets, including healthcare, sports and amusement, transportation, hospitality, education, retail and mixed use, government, manufacturing, entertainment, leisure, residential multifamily apartment buildings, and corporate and commercial office buildings. It has operations primarily in Northeast, Mid-Atlantic, Southeast, Midwest, and Southwestern regions of the United States. The company was founded in 1901 and is headquartered in Pittsburgh, Pennsylvania.