I bought a brand new home in 2005 and recently discovered water stains on my hardwood floor around the downstairs toilet. I took the toilet off and discovered a broken offset toilet flange. I called a plumber to look at it and he said that, it would be a MAJOR job, that he would have to take the wood floor up, break the concrete(house is on a slab) to gain access to the pipe, extend the pipe and put a straight flange on. The cost $1800-2000 dollars. I thought I was going to faint! So I got to thinking, if the offset flange is illegal to install, then the plumbing company that did the original work should be liable and have to fix it. The only possible reason I can think of someone using an offset flange on a concrete slab, is if they did wrong measurements, came up 2 inches short and did a quick fix by putting in the offset flange rather than busting up the slab and refixing it correctly. Someone, please give me some good advice here. thanks!