Hello Bruce! Bob has done numerous shows which they had to build second stories! My favorite the MALIBU HOUSE, THE SANTA BABARA HOUSE(arts&craft), Martha vineyard area. I had recently, spoke with two remodeling contractors, because we were planning to buy a 1958 custom house which is a fixer-upper! I was also curious about adding a second story . I was told that the house would need fittings, about $5,000(the house would not be able to hold the weight of a second floor because of the way it was built!) About $1,000 for engineer, about $10,000 just for the structure of one room , a second room about 8,000, if you want a completed room then it doubles! it cost about $100.00 a sq.Foot in california , maybe a little less if you have several companies bidding for the same job! Good-luck!!