This article proposes the use of current European standards and verification rules for environmental product declarations (EPDs) 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 such verification framework for evaluation of climate impact from alternative design options. In order to perform a sharp test of some main hypothesizes about how it's possible to create verified climate calculations, four of the project participants collected data for EPD-like LCAs from infrastructural projects.