15" on each side, 24" in front of toilet. check the brand of toilet for its dimensions as brands/models vary (especially the front)
Hey! Watch it!In an old small house it is often impractical or impossible to maintain water closet clearances without serious modifications to the structure. For that reason I'd suggest contacting the inspector to "feel him out" regarding leniency. When meeting the code on an old home becomes impractical or impossible, there is often room for some negotiation when the issue isn't going to get anyone hurt or killed. The clearances around a water closet are not life safety codes, they're for usability. They're written for people with wide butts and/or long legs.