The quality and suitability of construction materials has a significant impact on critical parameters such as time, cost, and quality in a construction project. Counterfeit, fraudulent and sub-standard (hereafter; CFSS) construction materials is a relatively unknown aspect in the literature. CFSS could potentially affect the degree of project success for both the client and the contractor. This research aims to answer the following research questions: What are the consequences of CFSS materials for the industry? What are the consequences of CFSS materials for the construction process? What are the consequences of CFSS materials for the final material? The research methods consist of a literature review and primary data was collected from the use of 13 in-depth interviews with key personnel from the client, contractor and supplier side of the Norwegian AEC-industry. The study is limited to the Norwegian AEC-industry. The research shows that CFSS-materials affects time, cost and quality in both the construction process and the final product. The use of CFSS-materials could provide “positive” consequences as competitive advantages for the contractor, but not without seriously risking negative consequences as loss of reputation, legal sanctions and/or extra costs. Consequences for the client can – if lucky – be none. If unlucky, the consequences can be higher operational costs or – if really “unlucky” – total structural collapse. The AEC-industry should be aware of false materials, and this paper contributes to exploring a relatively unexplored field within supply chain management in construction projects.