Floors and their traction level are in fact already regulated as part of ADA for many buildings. And there's tons of building codes regarding your residential b

Floors and their traction level are in fact already regulated as part of ADA for many buildings. And there's tons of building codes regarding your residential bathroom for similar safety issues - minimum clearances, height of fixtures, anti-scalding valves, types of glass. As others have pointed out, the entire building code is basically a balance between cost and safety. Anything having to do with egress tends to get extra attention, as well. If there was a zero-cost way to prevent slips and falls, it might well end up in the building code, yes.