Interesting thread! We are also from Middle Franconia (Nuremberg/Fürth/Erlangen region) and are currently looking for a reliable solid house builder from the region (doesn't have to be the cheapest, quality can definitely have its price!). We have already often read about Köhnlein Massivhaus (KMH), Büttner Massivhaus, and Noriplana Massivhaus, all of which have house proposals in their "[B]standard repertoire" that appeal to us. The "Google" reviews are also mostly positive (4,x ratings).
Is there anyone here in the forum who can give direct feedback from personal experience with these three companies (ideally has built with them themselves)? We would appreciate any tips :)