How to attain our climate objectives for the built environment. Take part! The Passive House Institute in Germany is an independent research institute that has been carrying out research on highly efficient building construction and renovation for over 25 years. Based on our years of experience with new construction, retrofits of existing building stock and the latest research findings, we have developed the following “building blocks”. These building blocks are a recommendation for a climate friendly built environment and they can be applied anywhere to contribute to climate protection.