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60's ranch, with single bathroom. Tile over concrete slab. Toilet is about a foot from exterior brick wall. Vent pipe is in interior wall behind toilet. There's a concrete patio outside the bathroom, that extends about 10 feet from the wall. I'm considering adding an ADU in the back yard, and it seems like I'd have to tie into the existing toilet sewer pipe (cast iron, I believe), because all of the plumbing heads in the opposite direction, towards the street. I have so many questions about how a plumber would tackle this. For starters:
- Would the patio have to be broken up, or could the new pipe be passed under it? I'm guessing the patio has to be demo'd.
- How much floor demo would have to be done in the bathroom to add necessary connections? Would vanity next to toilet have to be removed, too?
- Since the house has only one bathroom, how likely is it that the inside work could be accomplished in only one day? Not feeling too optimistic on that one.
- Any extreme ballpark estimate on cost of the project (if allowed here), just to see if I can even consider having this work done?
