Small estimate. We paid 430k for our build, of which 123k was land. That makes about 307k for the house and all ancillary costs and garage with carport.
What is included?
Bungalow with 160 sqm - kfw70, no basement, the roof caused an extra charge of 7k
Air-to-water heat pump with ventilation system
just under 100 power outlets
about 20 network outlets
5 satellite connections and dish
tiles in bathroom, guest WC and hallway (25 € per sqm was included in the construction service description)
electric shutters
smarthome (homeatic) in a slim version (lights, shutters)
garage 3x7m
carport 3x6m
paving stones for about 100 sqm
wastewater pump with lifting station
25k earthworks (rather unusual, but necessary for us due to poor soil conditions)
Do not underestimate the costs incurred besides the construction for a house. Connection costs can hit hard.