Here in my area of Florida a WC can be 17 3/4-18 1/4 and the tank handle has to be opposite of the side wall. I guess we will need to become a church to get things changed as I have just recently found out that all churches are exempt from all ADA codes in the State of Florida. That bit of info came to me as we are in the process of bidding an addition and I questioned the HC bathroom sizes with the builder and architect. A call to the building department and a discussion with the chief plumbing official and he informed of the state exemption, btw it was news to the builder and architect too. Seems strange as we just finished another church in the next county to the north and a call to that county to see what they know, and the answer was yes thats true but the chief building inspector interprets the state code his way and they need to abide by the ADA codes!! Go Figure, I stay confused as always!!