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National Certified Testing Laboratories is an ISO/IEC 17025 accredited, full-service, independent testing laboratory serving the architectural and building product industries from 1977. Since then, the company has expanded and maintains its headquarters in York, Pennsylvania with a Southern division located in Orlando, Florida and a West Coast Division located in Everett, WA and Klamath Falls, OR from the 2009 acquisition of Quality Testing, Inc. We are proud of our continuing growth and expansion of service. Our success has resulted from the quality of service to our clients. NCTL provides the Fenestration Industry the highest level of performance evaluations with state of the art equipment, teams of qualified technicians and an engineering staff including two on-site Professional Engineers.