Jst Builders 6030 Daybreak Cir Clarksville, MD 21029 Phone : (410) 884-0334 Jst Builders Business Category Building Contractors General Contractors-Nonresidential Buildings (No Industrial Buildings or Warehouses) Jst Builders 11018 Gaither Farm Rd Ellicott City, MD 21042 Phone : (410) 884-0334 Business Category Building Contractors General Contractors-Nonresidential Buildings (No Industrial Buildings or Warehouses)