Environmental issues and the damage industries have caused to the nature are undeniable at the present time. Unfortunately, construction industry is found to be the top polluter and the largest consumer of the natural resources. The currently used linear economy model at the end of the products’ life converts these resources into waste and encourages further resource consumption. Nevertheless, there is a better approach. Circular Economy model is advocated to help industries to perform in environmentally friendly manner and eliminate the waste. However, currently not many CE implementations can be seen in the built environment and it is acknowledged, that there are many factors influencing such condition. Even So, this study focuses on the technical instruments deficiency in order to move towards the more circular buildings. Many scholars agree that the early design phase is the best time to evaluate the decisions made for the future building, as at this time changes can be done with the least effort and lowest costs. Though, at the moment designers are not equipped with the necessary tools to carry out the assessment. Therefore, this study investigates the currently existing assessment tools, models, strategies as well as the possibilities to retrieve required data for the circularity assessment. According to the findings, a novel assessment framework is proposed while taking advantage of the Semantic Web and Linked Open Data technologies to provide a structure and openly available platform for a much-needed product circularity data database. Furthermore, the proof of concept is demonstrated as a first prototype of a new BCAO ontology dedicated to assist structuring the heterogeneous and scattered manufacturer products’ data for the circularity assessment.