Building permit

According to the current status (May 2021), photovoltaic systems on roofs generally do not require a separate building permit. But be careful: If a property is listed, there may be special conditions. The same applies to special development plans. These vary from region to region and from federal state to federal state. It may therefore be worthwhile to call the local building authority. If a building permit is required, you can expect costs of around 1000 euros.