Adding on a kitchen with an owner bedroom - plumbing

[Anonymous]

We are adding a 12 by 18 extension on our home. It is a brick semi detached house with the main waste stack in the back corner of the house along the party wall and back wall. Should we put the owner bath on the other side of it? And then somehow cut through the brick and attach the new bath drains into the stack?

I realize this is a technical question abd we can ask an architect. But before we do that we’d like to have an idea of how this works and what others in similar situations have done.

[Anonymous]

It's hard to run a drain horizontally in finished space. In unfinished space it's not bad. Vertically the drain can run through any wall.

Will you have an unfinished basement or crawlspace? Put the plumbing fixtures where you want them, run the drain down through a wall and across the unfinished space to join the existing stack.

If you don't have an unfinished space, in order to run a drain perpendicular to the floor joists -- which usually run the short dimension of the house -- you have to run the pipe below the ceiling below and then box it in with drywall. Usually you try to do this either in a closet or behind cabinets or something like that, this is where an architect can really help.

Making a hole in the brick for a drain pipe is not a big deal.

[Anonymous]

thank you!