Our builder's plumber put in our plumbing rough-in in the basement. Our house is 7 months old.

The layout and What I can see is as follows:
2" PVC shower drain stub is 20 3/4 inch from the concrete wall. According the the builder the layout calls for a tub positioned longways along this wall.

Moving away from the wall, the next thing is a 3" PVC toilet stub. It is positioned 49 3/4 inch from the same concrete wall.

Finally moving further away from the wall, the next thing is a 2" vent line. It is positioned 58 7/8 from the concrete wall.

The layout calls for the tub as mentioned then looking at the tub there would be the toilet on the left-hand wall, then a vanity (all moving away from the back wall)

The stub distances from each other are as follows, the vent pipe would be in the left-hand wall, the center to center distance as projected to the back wall from the vent to the tub is ~7", then it is approximately another 7" projected along the back wall to the Toilet stub.

The concrete was poured around these stubs so that the stub is projecting right out of the concrete, no square gravel areas surround either pipe

I'm assuming that the p-trap would be under the shower stub?

According the builder the rough-in is for a tub, however we have found an end drain shower pan that is 30x60 that seems like it will fit in this space, I believe we should just be able to hook up the drain to the 2" stub?

It seems to be virtually impossible to get the toilet to have 15” of clearance around it. After allowing for a stud wall and a standard tub. It appears that the only way to get the toilet to have the correct clearance to the sides is to use an offset flange, and even then we would have to cut the concrete floor to get it in, as I don’t know of one that can go inside a 3” PVC pipe? Do you have any other suggestions. I’m leary of cutting the floor and exposing the basement to possible moisture through this route? Also I’m worried about damaging the PVC pipe in the process. Any advice on cutting around it?

I would certainly appreciate any advice you can offer and I hope this is not too confusing.

Kim

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The layout and What I can see is as follows:
2" PVC shower drain stub is 20 3/4 inch from the concrete wall. According the builder the layout calls for a tub positioned longways along this wall.

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The measure's right for a shower, A tub rough in would be 15 1/2" off the wall.

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The concrete was poured around these stubs so that the stub is projecting right out of the concrete, no square gravel areas surround either pipe

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We wrap our toilet stubups with a Styrofome Wrapper so a closet flange can be installed. However if there's no wrapper you can use a inside closet flange with no problems.

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I'm assuming that the p-trap would be under the shower stub?

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That's the way we rough them.

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It seems to be virtually impossible to get the toilet to have 15 of clearance around it. After allowing for a stud wall and a standard tub

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When did your shower rough in change into a tub rough in?
Let's get something straight here.
Unless you have a 12 or 14" square cut out of floor for a tub trap you are roughed for a shower. You keep changing the terms back and forth and that's confusing me.
Since this is a 6 year 9old thread I should hope that all your issues have been resolved. Good luck, Tom