Leave well enough alone and just do a cosmetic redo. What you are proposing does not pass code. Or look in the other direction for the shower expansion. What's on the other side of the shower wall?

GreenDesigns-
So a 35" toilet space with 15" on one side and 20" on the other doesn't pass code? What is the reasoning behind that? I would have thought that if a 30" space with 15" on each side meets code, why would having extra space to the one side not be to code? A toilet isn't always between two walls.

We can't expand the other direction for the shower as that wall goes into our bedroom and the way the doors and an exterior window are positioned we can't move the wall any further into the room.

Ok..not sure if Google has led me down the right path but here is what I found according to IRC (International Residential Code) sec. 2705

http://archive.org/stream/gov.law.icc.irc.2012/icc.irc.2012_djvu.txt

"SECTION P2705
INSTALLATION
5. Water closets, lavatories and bidets. A water closet,
lavatory or bidet shall not be set closer than 15 inches
(381 mm) from its center to any side wall, partition or
vanity or closer than 30 inches (762 mm) center-to-cen-
ter between adjacent fixtures. There shall be a clearance
of not less than 21 inches (533 mm) in front of a water
closet, lavatory or bidet to any wall, fixture or door."

It doesn't say anything about the two sides being equal, just that they need to be a minimum of 15" from center, or 30" total center to center. Now you may tell me it will look horrible, that's another story, but I am not sure if I am following why it isn't to code.

Here is a picture I found online of an off center toilet. It is a toilet stall, and I think it is closer to walls/partitions than we would be...but it was all I could find. I don't think it looks terribly bad and to be honest I think ours will be less noticeable since the wall to the left will be a glass wall to the floor...so it will feel more open. Thoughts?

I did an off center toilet in our new bath because the toilet alcove is next to a low window with plantation shutters. The measurements from center might be more like 16" on the close side and 22" on the wider side. I am traveling so I can't check. But it really looks fine. By the time you put in a tp holder in the wider space, it's hardly noticeable.

kmcg- I would love to see a picture if you have one.

Hi KevinMP- Sorry if I wasn't clearer in my 1st post. That is exactly what we are planning doing. We currently have a 35" x 35" shower, 8" divider wall and 40" toilet space. Total wall length 83"

Plan is to move plumbing and eliminate divider wall...freeing up an additional 8" of shower space. We also have room to make the shower another 2" deeper...so it will be 37" deep (including shower curb)

We were also hoping we could have also easily move the toilet over 5-10" figuring we only needed a 30" toilet area, not 40".....ultimately creating a 37" x 53" shower. However once we opened the floor we realized that is not feasible.

So now our choices are as follows:
1) Keep a 40" toilet space, which makes the shower area 37" x 43" (including shower curbs)
2) Make the toilet area 35" by making the shower area another 5" wider...thus creating a 37" x 48" shower area (including shower curbs). However this option creates an off center toilet.

I just want the shower to be as spacious as possible, but if 5" isn't going to make a noticeable difference maybe we won't bother and will just leave the toilet at 40".
Thoughts?

The benefit you have is that you know from using your shower how much more space you need to be comfortable. Start with that as the baseline. If you think the extra 8" is enough, that's important to know. As long as you have 15" on either side of the toilet center, you should be good. Mine was 27", believe it or not, because my house is nearly 200 years old and didn't even have plumbing to begin with. I fixed it when I remodeled, and it's about 30" now, but it was very tight before with shoulder room. It all depends on what the dimensions are once it's off-centered. It sounds to me like you might have enough room to make it work. I wouldn't worry about the asymmetry if that's all it comes down to.

Here is what I have available, but it's not the best angle.