Product and service innovations are of great importance to maintain and increase the current market shares of companies. For this reason, the importance that companies attach to R&D projects is increasing constantly, and the problem of which of the proposed R&D projects should be implemented becomes a very critical decision due to the high cost of investments. Accordingly, in this study, an extension of fuzzy MARCOS method using fermatean fuzzy sets is developed to guide the selection of the R&D project to be invested. The developed methodology is applied to a company in the construction industry using the criteria technological applicability, economic benefits, technical benefits, technical risks, potential market size and financial feasibility to rank four innovative R&D projects.