Adding a bathroom to basement

[BryanBusby]

Been looking at houses and we haven't found one that matched our needs for extra space while fitting in budget. Our current house has a downstairs bedroom+bath which we've grown to really like for when we have guests from out of town.

Best solution I've came up with would be to build one in a house we buy. I figure I can install a basic shower, toilet and a sink without too much difficulty. What should I expect to pay for plumbing, walls and electrical? Tia