The draft Circular promulgates national technical regulation QCVN xx:202x/BXD, replacing Circular No. 04/2023/TT-BXD and QCVN 16:2023/BXD. This draft Circular is planned to take effect from January 1, 2027. It include a transitional provision which applies to Certificates of Conformity, Registered or Designated Conformity Assessment Organizations, Conformity Assessment Files with completed sampling, and domestically produced or imported building materials and products. The draft technical regulation (QCVN) lays down mandatory technical requirements, limit values, test methods and sampling procedures for high-risk and medium-risk building-material products and goods manufactured domestically, imported, placed on the market and used in Viet Nam. The main amendments and additions include: - reclassifying and restructuring the list of covered products according to risk level; - updating essential technical characteristics, limit values, referenced standards, test methods and sampling procedures; - adding certain new materials and filling/embankment materials derived from industrial by-products; - specifying principles for conformity assessment and declaration of conformity, using Method 2, Method 5 or Method 7 depending on the product and risk level; - for high-risk products, declaration of conformity is based on certification by a certification body designated by the Ministry of Construction; for medium-risk products, declaration of conformity may be based on certification by…