Description DXI Construction is a turn-key site contractor founded in Harford County, Maryland, with expertise in pre-construction services, clearing, excavation, underground utilities, paving, stormwater management, soil stabilization and more. With over 50 years of experience, DXI has grown and evolved into one of the premiere site preparation construction companies located within the Middle Atlantic region, servicing Washington D.C., Virginia, Maryland, Pennsylvania, and Delaware.