D.H. Charles Engineering Inc in Encinitas's Cardiff-by-the-Sea district is a structural and construction engineering firm founded in 1994, specializing in temporary works design for contractors throughout North America. Licensed in all 50 states and multiple Canadian provinces, DHC's Cardiff office supports scaffold engineering, excavation shoring, and bridge-jacking projects, temporary-structure disciplines that frequently coordinate with coastal commercial architects at A7 Group, Inc. during entitlement and construction phases. The firm earned the Scaffold & Access Industry Association's 2023 Outstanding Company Award and the Industrial Collaborative Project of the Year for its work on the Gordie Howe International Bridge. DHC's service portfolio also covers suspended platform certifications, tunnel shoring for pipeline installations, and temporary-event structural inspections, generating the kind of liability exposure that ACE Contractors Insurance Agency underwrites for North County general contractors. Highest-complexity engagements include OSHA-compliant engineered trench-safety systems, slide-rail shoring designs, and hydraulic jack certifications for historic structure restoration projects exceeding 500-foot span lengths.