average cost to build a second story addition
Second Story Addition Prices. Adding a second story to a one-story house is no small job. Depending on the size of your house the cost to build could be as little as $80,000 to as much as $3-400,000 and beyond.It is, however, a great way to add value to your home, and most times it will be cheaper than buying a house with a second floor.dding a second story to a one-story house is no small job. Depending on the size of your house the cost to build could be as little as $80,000 to as much as $3-400,000 and beyond.