May I ask where you want to build? Fingerhut Haus is still in the running with us as well. The initial consultation is still pending - they are still in because of the local proximity to the building site.
Unfortunately, I can't send a PM yet.. I'll roughly say Siegerland. We were also in Neunkhausen yesterday and looked at the show house there. It's about 20 years old, but we really liked the layout. (And it had a large basement).
Which providers have you talked to so far and what budget do you mention when you go into such a conversation?
From another thread I have the following breakdown:
House 150m2 x 2000: 300,000
Additional building costs: 40,000
Outdoor facilities: 20,000
Carport/Garage: 20,000
Kitchen/furniture/lamps/equipment etc.: 30,000
That makes a total of 410,000..without basement. Phew. Then probably more towards 135/140m2 instead of 150m2...