Great advice from everyone else on this...My feeling is you never know how much a remodel will cost until it is done! I know that isnt helpful so here is some information for you.
The big variables are where you live, the design, how much work you will do yourself and the materials you select. If you live in a rural - low cost area the price for your addition will be less than 1/2 of what you would pay in Manhattan, etc. Materails - same thing you can pay $30 for a faucet or $300???? And there are a lot of these material decisions in a bathroom. The 2nd story adds another variable especially in CA where the first story needs to hold up the 2nd in case of an earthquake so the existing structure may need a lot of reinforcement.
Having said all that there is no reason why you should not get a ballpark and that ballpark is $250 a square foot...plus or minus $100 a square foot (sorry for such a big range) I got that from the website RemodelOrMove.com which has a free to use online calculator for people who just want a ballpark estimate of remodeling costs. I pasted the numbers i got from the calculator below.
Estimated Report for whole house calculator...
After careful review of your project where you Hire a contractor, do None of the work yourself and use Average cost materials, we estimate the cost will be between $89,900 and $104,000. We also estimate the payback (the amount your home will appreciate by doing the remodel) will be $45,600.
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