San Francisco Bay Area - I need to add a second toilet in the same bath room.

by GEE Contracting and Development

I need to add a second toilet in the same bath room.

Instead of buying a condo costing $100,000 for second bathroom and second (not needed bedroom). Our one bathroom condo has a large sink/cabinet, regular toilet, a shower stall good size and a whirl pool (tub size). Have any of you plumbers out there heard of using the shower as a second place to install a toilet ,changing out the doors to double hinged for privacy. I need help before the flooring goes down. Does the sewage need to go to a special spot? Also we have neighbors below us. Any ideas would be helpful!

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Overland Remodeling & Builders If I understand it right, you want to install a toilet where you currently have a shower? If so, unfortunately that's not possible - your shower drain line is either 1-1-1/2" or 2" at the most, toilet drain line requires minimum of 3" drain line. How far is your current toilet from the second toilet you want to add? If it's close, try to branch out from the current toilet pipe to the second toilet.

Your plumber will have to make sure he follow the local code if cutting through the joists is required - to avoid structural damage.

Lucky you if you can run the pipe parallel to the joists and no cutting is required.

4 months ago · Like

Overland Remodeling & Builders Sorry for the typo 1-1/2" ( inch and a half).

4 months ago · Like

Norm Walters Construction Inc. The shower drain line is 2", or is suppose to be by code. It most likely connects to a 3" pipe at some point, maybe within a foot or so of the shower drain. Not only that there is a p trap connected to the shower drain which would have to be removed as the toilet has a p trap built in and you can't double p-trap. If your subfloor is concrete it's not going to happen because you are most likely not allowed to chip that slab.

4 months ago · Like

Ironwood Builders First time I've heard of a two seater in awhile! Overland is right, so is Norm. If you have wood sub-floor construction, it could be possible...or not, and you won't know until you tear up the floor and are already committed. Unless your downstairs neighbors don't mind you tearing out the ceiling of their bath just to have a look!

4 months ago · Like

ASVInteriors Just out of interest - are you talking about a toilet with a downward exit?
I have moved toilets around by building a return to house a slanting pipe that leads it to the correct drain and then installing a toilet with a lateral or horizontal exit (does this make sense?). It buys some height to give some travel length...
We have a norm of about 1cm drop per 1m of pipe. Could this be a possibility?

I don't want to confuse the issue but am trying to understand US standards.... so GEE please don't get your hopes up. These guys know what they are talking about and I am in Europe.

4 months ago · Like