I've got a home builder that is building a 3400 sq ft (living space) home and then finishing another 1000 sq ft in the basement. He's running all the basics, (2) electric water heaters, a 240V 20 AMP Well pump, Water softener and a Geothermal furnace (probably another 3 240V Circuits). He is then running a 100 AMP Sub out to a pole barn about 100 feet away from the house. He'll have a ded. 240V 20 AMP circuit, a ded. 120V 15 AMP circuit as well as 2 lighting circuits and 2 general power circuits.

He's wanting a 200 AMP service with a 100 AMP sub (that would be a total of 2 100 AMP subs). I suggested a 400 AMP Service...

Any thoughts or suggestions?