Basement Plumbing rough in help

Hello. I just registered with this site since it seems like there is a lot of helpful people here. I have some questions about a basement bathroom (we are currently planning out how we want to finish the basement and a bathroom is part of that plan).



The pic attached is where the rough in plumbing is in the basement. Now I am not a plumber, so I am doing the best I can identifying what I have here, and how to best use this setup.

On the left is the main DWV stack. On the far right is a vent, you can see an (elbow?) off of it and that is open. When I flush the upstairs bathroom or drain the bath nothing comes down there, just a bit of air movement.

Now on the floor there are 2 covers. The one with the black weight over it is a 4" pipe that is flush with the concrete for the toilet I assume. The cover at the back near the wall with the grey brick on it is for the shower/tub.

As you can tell by this rough in it is all very close together, which is unfortunate because we have a good sized basement. Now I was thinking about digging up the concrete by the shower drain and running it to the left (the opposite side inside the taped rectangle on the floor). With the toilet where it is I could place the vanity in front of it and tie into that vent. The reason I would do this is so I could build a seat in the shower adjacent to the toilet and you could actually step into the shower. Otherwise the way everything is right now, the shower seat would be on the left of that taped area and you would have to squeeze into the shower between the seat and the toilet.

Hopefully this makes sense.... I guess I am mainly looking for layout help since this is such a cramped area. If I am wrong on any of the pipes/drains please correct me. I'm a millwright not a plumber lol.

Thanks

This is one of those things you will probably have to look at for many years, so it's best to carefully plan it out. If you are willing to open up the floor and move the drains, you could make the bathroom with any layout you desire.

It's best to measure out the room and then draw out some floor plans to get some ideas as to what the possibilities are. Once you have a floor plan then you can figure out the drains and vents.

IMO, buying a house with the basement bath roughed in is a crapshoot, at the existing rough-in will very seldom be what a future owner wants in a bathroom.

Seems to me that every now and again we get similar questions for folks with basement rough-ins that are a Chinese puzzle. It may have made sense to whomever designed it or installed it, but doesn't fit the new owner's plans. Do as cacher_chick suggests and make a plan of what you want. Then get a plumber on site to revised your plans if necessary, then open the floor as needed to get the plumbing in the right place for your needs. There are concrete cutting companies that would make short work of this without making a mess in the house with concrete dust.