Toilet Clearance Requirements In Philadelphia

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Hi,

I was wondering if anyone knew how much clearance is required for a toilet. 

We are renovating a three unit row home in Francisville and our contractor has said we need 18" on either side of the center of the toilet. I thought it looked like a lot of space and saw in the ICC that only 15" is needed on either side. I know Philly follows it's own plumbing code but couldn't find the clearance requirements when reading through the code.

The 18" is making it pretty difficult for us to get out bathroom layouts to work and was wishfully hoping I could show our contractor that it's only 15".

Any insight would be greatly appreciated.

 Grady