VDA provides vertical transportation consulting and inspection services for elevators, escalators, and lift systems. Based in Pompano Beach, the firm serves clients worldwide with expertise in equipment inspections, modernization planning, design, and compliance management. VDA's consultants bring y

Sierra Consulting Group, Inc., a VDA company, is a full-service elevator and escalator consulting firm based in Manhasset, New York. The firm provides technical expertise and advisory services to real estate owners and property managers on vertical transportation matters, including annual inspection