Introduction The D. H. Griffin Companies (DHG) is a group of privately owned and integrated companies that provide contract demolition, environmental and site development services, to both public and private sectors. Together, the DHG network includes over 1,000 employees in offices throughout the South and Mid Atlantic states, with an equipment fleet numbering over 600 pieces. DHG completes in excess of $400 million dollars in project revenue each year, serving both domestic and international markets.