My son bought a 100 year old house with a small bathroom. It has been renovated within the last 6 years but the previous owners installed a cabinet-mounted sink that takes up a lot of room. He would like to replace it with a lower-profile pedestal sink. I have been asked to do the job!
The problem is the drain and water supplies come out of the floor about 4" from the finished wall (pictures attached). The floor is nicely tiled under the cabinet and it is out of the budget/skill set to tear up the floor and reroute the plumbing below the floor level. The current plumbing relies on an Air Admittance Valve (AAV) and I will be forced to do that in the new configuration.
I was thinking of routing the drains in one of 3 ways. Either 90 degree or 45 degree elbows and take the drain into the wall. Run the vent up to an AAV that would be situated behind the mirror so it can be serviced. I can make a cover for the plumbing easier if I use 90 degree elbows. The other is to run the drain along the wall and put the AAV underneath the sink. I'm not actually sure I have enough room to get the P-trap in, though.
I'm leaning towards A or B which will be a lot more work but seems more appropriate in the long run.