For the rest it is highly recommendable to contact experts, especially if you intend to buy an old building, to assess its potential. Does the building comply with the provisions on landscape and water protection? Especially those who build a house from scratch should keep in mind that in each canton and municipality different building parameters and provisions are in force, which are absolutely binding. They specifically concern aspects such as territorial planning, protection of the environment and nature, protection of settlements, etc. These maps are publicly accessible for Asset Management and can be consulted by anyone, for example on the geoportal.
Buying a building without an energy certificate? A housing certificate provides information on the energy status and energy consumption of a building and assigns each building a specific energy class (A-G); A means New standard construction, G is an old building that needs to be renovated.