KfW loan + repayment grant for granny flat

Do you then have 2 ventilation systems and 2 electrical circuits for the [Einliegerwohnung]?

We are still under construction but have done the following: * Planning-wise, 2 residential units in documents for the authorities * Separate electricity * Separate ventilation system * Separate stairs and house entrance * Limestone wall to separate the residential units * Additional parking space * Care taken with cable routing and room planning to avoid noise. The granny flat is in the attic * Appropriate quiet floor coverings in the granny flat * Provision for complete separation of electricity and water for the two-family house

For this you get: * Additional KfW subsidy * Special depreciation for new residential buildings (tax) * Linear depreciation

I found the requirements for a granny flat very vague. Also regarding the ventilation system. We just wanted to have it separate. I couldn’t find out if that is necessary.

The planning somehow entails many things which, as I think, later on—for example in a conversion—can hardly be achieved.

A few things have already been addressed here:

Good luck

Ok, I'll take a look at it right away, thanks. I have everything as you stated above, including the partitions made separately from calcium silicate bricks for fire and sound protection.. only no separate ventilation and electrical circuit.. since it is for mother-in-law.. there will be an agreement..

Do you then have 2 ventilation systems and 2 electrical circuits for the granny flat?

The granny flat gets its own meter and a water connection for a small kitchen unit. But nothing more. Controlled residential ventilation should be connected to the main system. Separation is mainly via a exposed concrete wall on the ground floor.