My current toilet is measuring at 11 inches even from the wall (not the molding) to the center of the bolts. Looking around I see a lot of people saying that they saw somewhere else that a 12 inch rough-in will fit, possibly with an offset flange, but I'd like a more authoritative answer if possible. My house was built in 1900, so a non-standard size wouldn't really shock me.
2 Answers
10" unless you can move the wall back.
Yes. You could cut the floor around it and put the offset flange like Home Depot model #889-POMPK but it will probably get to more than 12".
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No. I'v done it already on concrete floor and it wasn't sooo hard, it took just a hammer drill to dig around it and all the mess is getting covered by the toilet very nicely.– aofkjDec 23, 2016 at 6:09