Envimat.cz is a new online catalogue of environmental profiles of building materials and structures localized for the Czech Republic. It allows users to compare, model and edit chosen elements. One of the main objectives is to help architects and designers to choose appropriate materials for their building and provide information on its environmental impacts. Information from the catalogue can also play a significant role for developers and their customers. Initial data are derived from the Swiss database Ecoinvent but the goal is to replace them continuously with more accurate, localized data coming from Environmental Product Declarations provided by Czech building industry producers. Envimat.cz brings multiple benefits, especially for the following stakeholders: it gives better information to the building owners; architects can easily choose solutions that are environmentally friendly; efficient producers can make profit from their advantage and Czech construction industry as whole is shifted to higher environmental friendly standard.