Tell him how you want the addition to connect to the original house. How many square feet of windows, types of interior finishes to the addition. He'll have other questions too, I am sure.
Contractor, NRG Construction
916-677-7161 - Mobile
916-772-5675 - Home
Next answer to the question not asked.:
the added real estate resale value in todays real estate market, of the addition, will almost certainly be less than the total cost in todays dollars of building it.
Another answer to an unasked question: Never, never, never, ever never build an addition without proper building permits. It is the stupidest thing a person can do without matches. .
What do you mean? Are you asking the average cost for adding to your home? This can depend greatly on the addition being done. Contractors can charge $150-$300 per sq ft. I would advise to get multiple bids and check their licenses.