So for 3088.55 euros gross, for example, you can do further training to become an energy consultant at the TÜV Thüringen Academy.
4 weeks full-time and you are already the expert on energy-related questions.
Yeah, right.
It's not quite that simple, but it's not rocket science to get the certificate. The certificate then entitles you to BEG / KfW / Bafa - funding support etc., but without basic prior qualifications, you are actually unqualified for anything beyond individual measures. And even then, the short training cannot convey everything that is relevant – which unfortunately leads to botched heating system plans etc., despite having an energy consultant.
The training scope is not insignificant with 180 * 45min. For engineers and architects, much is just repetition, for people with first contact, it is quite demanding.
By the way, the QNG / Birn certification is significantly more complex and requires about 70 full-time days for already qualified energy consultants with professional experience and costs quite a bit more.
Providing the QNG calculation is much more work than the calculation according to the Building Energy Act or KfW40 and here too, costs for the examination by the energy consultant arise.
I have often heard and read that 20k for a single-family house for QNG (Birn is somewhat cheaper and also fulfills KfW40 NH) is not an outlier. Whether it is really justified, I don't know, I don't do it myself.
The other prices that the original poster was given are certainly not unreasonable. But for years energy consultants were only regarded as a nuisance side issue, so I understand some who now raise prices where they can.
The number of energy consultants will probably increase, but unfortunately the quality will decrease. Previously, people did it out of interest in the subject matter (the participant group 10 years ago at the first meeting I was allowed to attend was quite different from today) – today, because they simply smell quick money. Many will then realize that you have to work for your money there too, and expertise and further training are indispensable to do this for more than 2 years.