Adding a bathtub to two piece bathroom

We're in the process of looking for a house and one of the things that I really REALLY want is a full master ensuite. This way we won't have to share a tub with the University students we plan to rent rooms to! :)
However, I feel that to get the best deal we should be open to considering some of the houses that only have a two piece bath, but perhaps enough room to install a tub either in the bedroom (near the bathroom), or expand the bathroom, etc. You get the idea of what I'm talking about.
My question is, generally, is it a pain in the butt to add a tub into an existing home? This would be on a main floor, but there is a chance if there is a powder room in the basement and bedrooms there, we may need to add a shower or tub in the basement as well.
I tried searching the net but didn't really come up with anything useful. We wouldn't do the plumbing ourselves, but we would do a lot of the drywall, construction and any electrical that needs to be moved (hubbys an electrician but no plumber!), but the plumbing we would leave to a professional. We just want an idea of how big a job it is (in general, I know it depends on the situation).
Thanks in advance!! Shaynelle
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Katherine wrote:

snip

A big general "first consideration" answer: Most people think of plumbing as running supply lines, but the big "gotcha" with plumbing is drainage. Tubs n sinks n toilets (especially toilets!) need to drain into a "stack" a vertical riser that goes to your main sewer line. That's usually an existing stack, but you can run new ones, but that's where it gets ugly. Anybody can run hot and cold supply, but getting rid of the stuff is your "big job" in most cases. Think *drains* when you get a mental picture of your brand new stuff. HTH.
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Oh, sorry I was actually thinking drainage, but now I realize of course I didn't even mention it! Especially if we need to put a bathtub or shower in the basement, I assume we'll need to gorge out some of the concrete and repour it :( Thanks for the info, it sounds like the drainage is indeed a big deal. Hopefully not something thats going to cost a small fortune however! :(
Shaynelle
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It will cost a small fortune, even if you do most of the grunt work yourself. A "small fortune" is relative - and since you're looking for "the best deal" by considering cheaper homes with only a 2-piece master bath (The difference between a deal and the "best deal" being the cost of a 2 full-bath home over the cost of a similar 1 & 1/2 bath home) unless the difference is more than a couple of thousand you're better off looking at homes with 2 full baths.
Even if you find a home with enough space to expand the master bath, you'll probably end up having to completely gut and re-do the master 1/2 bath and closet areas in order to fit in a tub.
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