Can anyone point me towards some reliable info on building code requirements for interior stairs in a duplex. I'll admit upfront this is not a tenant query- I want to buy a two family house and incorporate the basement (which is currently used as an illegal third apartment & which is below ground on the front side and completely above ground in the rear) into the first floor unit to make it a larger, duplex apartment. The stairs are very narrow now & I need to find out how wide they are supposed to be.
Thanks for any info or links.
J