The aim of this project is to develop policy instruments and to quantify their impacts applying a simulation model. Thereby, the perspective of individual actors is taken into account.  In addition to the building owners, who already represent different target groups considering individual barriers and decision-making calculations, relevant stakeholders include tenants, who are more and less burdened depending on the design of certain policy instruments. In addition, energy industry actors are relevant, especially in the field of central heat supply via district heating. Intermediaries such as installers and tradesmen are another group of stakeholders that have hardly been addressed by policies so far. Overall, three different policy packages are developed and evaluated with which the goal to achieve climate neutrality in the building sector by 2045 can be achieved. The effect of the policy packages will be quantified by applying the simulation model Invert/ee-lab and successively adjusted in an iterative process until the goal is achieved.