KFW 40+ One central ventilation system per residential unit?

Hello everyone,

we are planning to build a house with two residential units. Our prefab house provider claims that each residential unit needs its own central ventilation system in order to receive the subsidy for both units. Is that true?

Regards

Yes, it was the same with us.

But also logically, you set the controlled residential ventilation to party mode at your place and at the neighbor's the drafts are noticeable. Of course, my depiction is exaggerated, but that's how it is.

There is nothing more to add to that. Completely correct.

Wow. I would never have thought that. A friend built the same way the year before last and also has only one system. Unfortunately, we therefore did not factor that into the finances.

You can check if the 2-unit is possible without ventilation. However, I would no longer build without it nowadays.

I was just about to complain "we had this topic recently" and then had to realize: twenty minutes of hardcore use of the forum search unfortunately is not enough to find the relevant twin post :-(