This article proposes the use of current European standards and verification rules for EPDs (environmental product declarations) as a basis for evaluating the climate impact of contractors’ alternative designs of infrastructural projects. The proposed conceptual framework for verified climate calculations is based on the Swedish-based, the International EPD^® System. Several Swedish and Norwegian stakeholders were engaged in this joint project to understand driving forces and obstacles and provide key insights for the successful implementation of the framework for a transparent and comparable assessment of climate impact from alternative design options. In order to perform a sharp test of some main hypothesizes, the project participants tested the proposed framework in bridge and roads projects.