When renovating old buildings, the energy demand of a building can be reduced by up to 80%. The Ministry for the Environment, Climate and Energy Management of Baden-Württemberg has published a guide. It describes the 10 steps that must be taken for successful renovation.

The guide thus provides a good introduction and a comprehensive overview.

Refurbishment guide: Successful renovation in 10 steps: Ministry for the Environment, Climate and Energy Management Baden-Württemberg (baden-wuerttemberg.de)