In 2016, approx. 45 % of the CO2 emissions and approx. 47 % of the final energy demand in Bavaria were connected to the heat supply. In each case, more than half of these percentages are connected to the heat supply of the residential building stock. This shows, the Bavarian goal to be climate neutral by 2050 (status 2021) cannot be achieved without significant energy savings in the residential building sector. Previous investigations analyzed the final energy consumption of Bavaria's building stock. One result of previous study was that even if the building stock is fully renovated by 2050, the Bavarian goals for 2050 (status 2021) will not be achieved though. However, considering final energy demand, there is still no distinction between renewable and conventional energy supply. In this study, the existing building technology and heat supply infrastructure of the residential building stock will be analyzed. Based on Barton’s (previous investigations) forecasts of the final energy demand, three scenarios for the development of building technology and heat supply infrastructure until 2050 will be defined. The replacement cycles and innovations are also taken into account. The results aim to show what extent renewable energies have to substitute conventional energies in order to achieve the political goals, and which building technologies and heat supply infrastructures are compatible with this goal.