WDF Inc. (founded in 1929) is one of the nation’s leading plumbing, HVAC contracting and specialty general contracting companies. We have joined with Five Star Electric Corporation and Nagelbush Mechanical to form GreenStar Services Corporation as a diversified full service construction company. WDF Inc. has worked with the nation’s leading owners, general contractors, architects and engineers on many significant construction projects including high rise construction, waste water treatment plants, educational facilities, transportation systems and infrastructure projects. Our projects serve the private and public sector markets.