efore a product can reach the market, it must generally be able to verify to a consumer or control board that it is safe and performs as claimed in terms of energy efficiency, consistency, sustainability, and a variety of other criteria. The action of confirming that a standard or technical specification was followed in the design, manufacturing, installation, maintenance, or repair of a device or system is known as conformity assessment. To achieve consistent and repeatable results, this activity must be carried out according to a set of well-defined criteria. In other words, conformity assessment must be conducted in a consistent manner. Nowadays all the project need approval in its processes so it can start working, including the construction projects. In construction projects the conformity starts for the design and end in the finishing work. Every country or region has its own standard and specification to ensure the stability of the construction project, where this standard suit the region conditions, uses and the availability of the used materials. In Kingdome of Bahrain, they set there standard for construction work. The new Standard Specifications for Construction Works aims to bring consistency to the construction sector by providing a crucial reference for developers to ensure that construction projects are developed to the highest possible standards. It serves as a guide for design professionals in terms of acceptable construction methods for Ministry of Works projects. In this research the conformity assessment for building materials in construction project in Kingdome of Bahrain will discussed. The research is aiming to discuss the conformity assessment definition and types, how the conformity system applied in construction project, the standard specifications for construction works in Kingdome of Bahrain, the standard of Earthworks, Concrete, Masonry, Glass & Glazing, Structural Steel & Coating, Painting & Decoration and Internal finishing including the thermal insulation Materials and how these materials tested to conform the standard.