My home is in Northern Colorado, built in 1997, bi-level with an unfinished "basement" that is entirely above grade, with a rough-in bathroom and a small open space that I want to turn into an office area. With the bathroom area in particular, I'm fairly certain that I've got to move the toilet drain, but I'm also wondering if there's something I'm missing here, because it feels like the house shouldn't have passed inspection at the time it was built.
I'll post the diagram and a picture here, but you can see a full gallery of pictures & captions of my bathroom here on imgur for a little more context or a larger view of the situation.
You can see in the pictures and in the diagram that the edge of the toilet drain is 14 3/4" from the edge of the concrete footing, and the waste stack is in between the two. Even before framing a bulkhead around the waste stacks to conceal them, there's only about 10 1/2" between the edge of the toilet drain and the edge of the waste stack, and the protrusion from the access into that waste stack reduces that down to around 9", before any framing.
I've looked into the possibility of using an offset toilet flange, but that only buys me around 1.5" - 2" at most. As near as I can tell, my only real option here is just to tear up the floor and then move the toilet drain, right? I feel like this is so obviously an issue that the plumbing simply shouldn't have been deemed acceptable when this was first installed 25 years ago, which makes me wonder if I'm not missing some sort of alternative here.
Assuming that this is the case, my tentative plan is to have the drain moved to about 20" off the edge of that concrete footer, and with new framing around the waste stacks, it would be about 12" off the new bulkhead hiding those stacks. That would leave about 44" from the drain to the wall in front of it. I also figure that I'd want to put an access cover in the wall behind the toilet to allow access to those stacks, though I'm not sure if that's allowed to be done behind a toilet or if it would need to be moved up the wall to be more accessible. Appreciate any feedback or wisdom that anyone has to offer!