Builders Design | Full Service Interior Design | Gaithersburg, MD - Builders Design | National Interior Design FIrm Design, Trend, Marketing, Stellar, Customer Service, 7601 Lindbergh Dr, Gaithersburg, Md, 20879, 7039262809, model, multifamily, 55 +, vision, leadership Builders Design is an Award-winning Interior Design Firm Specializing in Model Home, Multi-Family, Active 55+, and Senior Living Interiors. Entrepreneurial thinking and design excellence are the cornerstones of our firm and have been our recipe for success for 40 years.