The question about cost depends on several factors. Is the bathroom on the first or second floor? Whats below it?? Of course where you are makes a difference as well. We added a master bath last year. It was on the second floor, over a office below and there was no plumbing there at all. The plumber had to bring the entire stack up from the basement and then put in toilet, tub, shower and sink and put the vent up through the attic to the roof. The cost was about $5000- which I thought was reasonable. This was just the cost of labor- valves and fixtures were extra. We also had to pay a carpenter to box in the pipes in the room below and repaint of course!!! (One thing always leads to another) We are in the Boston area. You already have plumbing in the area, as well as an air stack through the roof. Remember too that depending on the size and circumstance of your space raising up the floor might make replumbing much less expensive than either putting it into the floor- or under the floor as we did. Good luck

Look into getting new vanity, prefabricated one in HD or IKEA will not be much more than just countertop, but will improve storage. We got one from overstock including countertop, sink, faucet for 900. If you do all white would be great to use wood look tile on floors. Maybe wooden shelve above toilet.

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Here are a few quick tips to find out how "correct" the install is (or isn't). Correct meaning 'will not fail' vs. looks pretty. Looking pretty and being correctly installed are two different animals. 1. Caulking is used at EVERY change of plane (ahem...corners). Grout is NOT allowed when tile goes around a corner or goes from flooring tile to wall tile. To check for caulking just poke your finger nail in there and push. If it feels rubbery = caulking. If it feels like hardened sand/stone = grout. **Hint** Look at the GROUT that is sitting all around the wall cubby and the grout that is running down the corner...check the marble floor/tile wall connection. Do you see more grout? 2. Did they use wood (raw wood) at the shower threshold? If you remember seeing a plank of timber being 'tiled' you have issues. 3. Water Draining out of the shower should be even. The shower floor should not have areas that are left 'wet looking' (ie. darker...marble is AWESOME at showing this...which means you can test this very easily for yourself) for hours while other areas look 'dry' very quickly. An uneven drying time tell us water is SITTING (ie. not draining) under the marble. Issues like a mentioned above can be a perfect storm waiting to come crashing down (through the ceiling? below?) around your head. They are also issues that point to a REDO (especially the shower floor stuff). The uneven wall tiles = uneven wall. They needed to shim the walls (when the studs were exposed) and/or float the tile (very difficult and expensive and requires an OLD FASHIONED Tile Pro to get it done properly). You didn't get either. In other words your General Contractor used 'guys' to lay the tile and not the EXPENSIVE Tile setters (ahem...GCs HATE using expensive pros...it messes up their bottom line/quotes).