Keystone was founded as a National Fenestration Rating Council (NFRC) licensed Inspection Agency in 1998 by Former President, Marcia Falke, building on her more than 25 years experience in fenestration testing & certification. Since then, Keystone has added numerous certification, inspection and quality assurance programs focused on energy efficiency and structural quality. Our programs are utilized in a wide variety of product categories ranging from building products to appliances.
Keystone retains licenses, accreditations and recognition from a number of accreditation and government bodies, as well as memberships and affiliations with various industry associations, including:
Licenses, Accreditations, & Recognitions
Licensed Inspection Agency by the National Fenestration Rating Council (NFRC).
Accreditation by the American National Standards Institute (ANSI).
Accreditation by the ANSI National Accreditation Board (ANAB)
EPA Recognized Certification Body (CB) for the ENERGY STAR® program.
Florida Department of Business and Professional Regulation (DBPR) Recognized Quality Assurance Entity.
Florida Department of Business and Professional Regulation (DBPR) Recognized Validation Entity.
Memberships & Affiliations
Member of the Fenestration Manufacturers Association since 2003.
Contributing to standards development as a member of the ASTM.
Affiliate member of the Efficient Windows Collaborative.