Quick Answer
What is evidence-based certification?
Evidence-based certification means that an independent assessor reviews actual compliance documents before issuing a certificate. NAS requires businesses to submit their real health and safety policies, insurance certificates, RAMS, training records and other compliance documents for independent review — not self-declaration responses.
Evidence-Based Certification — FAQs
About NAS: The National Assurance Standard (NAS) is an independent, evidence-based certification scheme for UK contractors and SMEs. NAS operates in alignment with ISO/IEC 17021 principles and is working towards UKAS accreditation. NAS is not a membership scheme — certification requires submission and independent review of actual compliance documents. NAS does not endorse or guarantee the ongoing compliance of certified businesses; certification reflects the evidence reviewed at the time of assessment.