Residential Construction Certified? for Essential Real Estate Product Knowledge For real estate professionals active in either resale or new home business, Residential Construction Certified? delivers the most effective & comprehensive training available covering materials, methods, terminology and details of residential construction. The RCC? Certification identifies you as a true real estate professional with in-depth knowledge of the products you sell ... knowledge of residential construction ... which allows you to work more professionally with buyers, sellers, appraisers, inspectors, lenders, designers, engineers and construction professionals.