Blower Door Test during construction not considered/What now?

Hello Wastl,

if at all, they orient themselves either on the specifications of a KfW 70 energy-efficient house - but do not take advantage of KfW loans and only need to comply with the applicable Energy Saving Ordinance. If a builder, on the other hand, includes KfW funds in their financing and installs a ventilation system, as far as I know a BDT is mandatory.

Building expert, on the go

...If a ventilation system is installed, the BDT - as far as I know, is generally mandatory when KfW funds are used; regardless of whether it serves to achieve KfW "X" or not...

Correct! The Energy Saving Ordinance is one aspect, KfW is often somewhat another

v.g.