With an increased demand for sustainability in the building sector and to continuously worktowards the current climate goals, there has been a rise in incentives to build moreenvironmentally friendly. By implementing building materials with less environmental impact,one can actively contribute towards achieving these goals.This thesis is based on the development of a comprehensive parameter sheet designed toevaluate and compare the environmental impact of two building frames: a timber frame and asteel and concrete frame. The parameter sheet is developed in a math software for engineeringcalculations, called Mathcad. By allowing for adjustment of the input variables, customizationscan be made to generate results that are tailored to the specific project requirements.The purpose of the parameter sheet is to support early-stage decision-making regarding thechoice of building materials with regards to their environmental impact. By makingwell-founded decisions during the initial phases, the construction process can be simplified andexpedited, all while promoting sustainable construction.The parameter sheet presents the result in the form of a diagram where the total values foreach frame’s global warming potential (GWP) can be easily compared. The GWP values arebased on values from the building materials EPDs (Environmental Product Declarations) aswell as the structural calculations of the frame components.The results of this thesis are derived from two representative frames produced by “Tr¨agruppen”at Sitowise. The diagram clearly illustrates the environmental benefits of the timber frame, asevidence by its lower GWP values when compared to the steel and concrete frame. Thisdifference can be theoretically explained by the fact that the timber frame and its componentshave negative EPD values in the product stage of a life cycle analysis.