Guardian Construction Co., a subsidiary of Guardian Companies, Inc., is a women-owned general contracting firm, which started ... business in 1976 based out of Wilmington, Delaware. Through diversification brought about by the demands of the marketplace, Guardian has grown significantly each year since its inception serving state, federal, city and private corporate accounts. Guardian concentrates it marketing efforts in business areas where it has established a solid marketing presence: commercial construction, underground utilities construction, and customized services. read more