Very expensive--the cost for new isn't so much in the fixtures. Basic bathroom or plush bathroom, the internal parts are the cost. To run pipes in spaces is the $. From a second floor, it is not going to be cheap.
Cost of The Second Floor Addition. Perhaps to a price range of $70-$150 per square foot. For a house that is 1,500 square feet wide, the range of the overall cost is going to be around $105,000 - $225,000, but of course this will all depend on how much you can do your own construction of it.
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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.
But the additional cost to add those two extra bedrooms and one bathroom will be so relatively small that you may want to rethink your strategy. Adding up is costly, and whether you're adding one master suite or three bedrooms and two bathrooms, you still have all of the associated costs that go along with that: structural, heating, roofing
While a bathroom can be added very affordable by taking into consideration your current bathroom situation, the average cost to add a bathroom in 2019 is around $7,600. This can be as low as $2,500 if updating an existing space and keeping the upgrades simple, or as high as $25,000 if adding an entire addition onto your home to make room for the new bathroom.