Personally that depends on your appitite. What do you want in terms of upgrades and extras? The sky's the limit. What's your budget? I wouldn't even show up for an estimate for less than $150/sf no matter where it was. And that's just a starting point. Good luck.... more
I would look for a way to keep the bath in tact if not as a full then a 1/2 bath. It sounds like you are not adding any square footage to the house. If that is the case then I would say you are hurting your value if not marketability. If it is possible to put the laundry in the garage and keep the bath that may be a better option. This is definitely more of an opinion that fact.