Obligations for renovation and new construction
In the case of a new construction, extension and drastic energy renovation, a complete ventilation system must be provided: dry rooms (living room, bedroom …) must be equipped with window ventilation, a supply grille in the external wall or a supply opening for mechanical ventilation. Intermediate spaces, such as the lobby, must have grilles in the interior doors or interior walls or there must be a gap of at least 1 centimeter below each interior door. Wet rooms (such as bathroom, storage room, kitchen, laundry room …) must have a discharge channel that is connected to mechanical ventilation.
Anyone undertaking a renovation project should only install or have installed, at the minimum, supply and discharge facilities in all dry areas where windows are replaced or added.