By mail, of course. They need: invoices, proof of payment (bank statements), documentation from the expert (?) and documents related to the hydraulic balancing as far as I have interpreted it correctly.
Hopefully you don't have a fake granny flat with a glass door ;)
Nope. It’s about individual measures with KfW 430: facade, windows and heating. Apart from a few nuances, it should be consistent.
The day before yesterday, the tax office also wrote to me. They want similar documents for other trades that I indicated within the framework of the tax incentives. Unfortunately, not everything is recognized after all, because, for example, I paid a craftsman in cash. Despite invoice and receipt, no 20% reimbursement, since a bank transfer must have taken place necessarily.