KFW 70 | Requirements for basement windows?

Thank you for all the replies! I never expected to get so many – I’m new here. Sorry for my late response.

: Developer, yes! He represents the architect, civil engineer, and everything else for us. In the meantime, we are trying to take over the construction management. But the contract has been signed for more than a year now, and we are stuck with his "slow" (forgive the expression) way of working. However, a lawsuit would only prolong the whole thing. So we have no leverage that would help us.

: Yes, at least double glazing. Our developer might want to save money on us.

I took out my energy certificate. Unfortunately, the data about the basement doesn’t tell me much. I’ll attach the page here. Can you read anything from it?

Hello,

Developer, yes! He represents the architect, civil engineer, and everything together for us.

Did you also acquire the land through him, so everything from one source?

In the meantime, we are trying to take over the construction management ourselves. But the contract has been signed for more than a year now and we are stuck with his "slow" (forgive the expression) way of working. A court case would only prolong the whole thing. Therefore, we have no leverage that would help us.

If I were you, I would go to the Chamber of Architects; they have so-called mediators who can be of good service in such cases.

I once unpacked my energy certificate. Unfortunately, the data on the basement doesn’t tell me much. I’m attaching the page here. Can you read anything from it?

According to your attachment, your basement has no basement light wells.

Rhenish greetings

There are only basement interior walls; the basement exterior wall is missing.