Adds to existing law to establish provisions regarding single stairway building exceptions.

This legislation amends the Idaho Building Code Act to authorize local governments to allow certain apartment buildings to be served by a single interior exit stairway, notwithstanding adoption of the International Building Code, provided they meet certain life safety and design standards. Eligible buildings may be up to six stories, with limits on unit count per floor and total floor area, and must include enhanced fire protection measures such asfullNFPA13sprinklersystems,two-hourfireratedstairandshaftenclosures,pressurizedstairwells,firerated corridors and openings, limited travel distances, emergency escape and rescue openings, and comprehensive smoke and fire detection systems.