Hi there --
I want to put a second bathroom in my home. The location already has plumbing and a drain as it used to be where the washer and dryer were located.
The drain pipe goes from the spot where I want to put the bathroom down into the garage and then into the concrete floor of the garage. From there, it goes underground about 75 feet to the main drainage line at the street.
I've discussed this with a contractor (not a plumber, but he also does plumbing), and he says that the drain pipe that is visible is too small for toilet drainage, though it is fine for shower, sink, and bath drainage, and that the only way he can tell if the main drain pipe buried beneath the garage floor is larger is to jackhammer the concrete up to inspect the pipe.
Is there another way to determine the size of this pipe, such as by looking at city records or something?
This house was built in 1962, if that helps at all.
I am also wondering if anyone has a ballpark idea of what it will cost (in the Seattle area suburbs) to replace the drain pipe if it is not large enough. This would involve tearing up the asphalt driveway and the concrete floor of the garage, putting in the new pipe and then fixing the garage floor and driveway,
Thanks for any advice you can offer!
FA
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