Limbach Holdings, Inc. engages in the provision of commercial specialty contractor services in the areas of heating, ventilation, air-conditioning, plumbing, electrical and building controls for the design and construction of new and renovated buildings, maintenance services, energy retrofits, and equipment upgrades. It operates through the General Contractor Relationships and Owner Direct Relationships segments. The General Contractor Relationships segment manages new construction or renovation projects that involve primarily HVAC, plumbing, or electrical services. The Owner Direct Relationships segment provides maintenance or services primarily on HVAC, plumbing or electrical systems, building controls and specialty contracting projects. The company was founded in 1901 and is headquartered in Warrendale, PA.