{"format":"cadcraft-library-item","format_version":1,"uuid":"8cc7732d-6d05-4ab7-8f81-7b05ce8aa58f","version":3,"name":"United States: International Residential Code 2015","kind":"regulation","category":"regulations/building","description":"The model code: numbers and section numbers entered from the IRC 2015 text in ICC's free viewer, checked 2026-10-27. A model code is not law until a state or city adopts it; pick your state's pack to check against what applies there.","maker":"","model":"","ifc":{"class":"IfcControl","predefined":"NOTDEFINED"},"plan":{"layers":[],"entities":[]},"body":null,"params":{},"regulation":{"format":"cadcraft-regulation-pack","version":1,"id":"us-irc-2015","name":"United States: International Residential Code 2015","jurisdiction":{"country":"US","level":"country","region":"","name":"United States"},"base":null,"edition":"IRC 2015","in_force":null,"review":{"state":"draft","note":"The model code: numbers and section numbers entered from the IRC 2015 text in ICC's free viewer, checked 2026-10-27. A model code is not law until a state or city adopts it; pick your state's pack to check against what applies there."},"authority":"model-code","source":{"name":"International Code Council, International Residential Code 2015","url":"https://codes.iccsafe.org/content/IRC2015/chapter-3-building-planning","date":"2014-05","checked":"2026-10-27"},"maker":null,"price":null,"criteria":[],"tables":[],"rules":[{"id":"stair.riser.max","applies":"stair","op":"<=","unit":"mm","clause":"R311.7.5.1","label":"Riser height","note":"","value":196.85},{"id":"stair.tread.min","applies":"stair","op":">=","unit":"mm","clause":"R311.7.5.2","label":"Tread depth","note":"","value":254},{"id":"stair.width.min","applies":"stair","op":">=","unit":"mm","clause":"R311.7.1","label":"Stair width","note":"","value":914.4},{"id":"stair.headroom.min","applies":"stair","op":">=","unit":"mm","clause":"R311.7.2","label":"Stair headroom","note":"","value":2032},{"id":"stair.rail.height","applies":"stair","op":"between","unit":"mm","clause":"R311.7.8.1","label":"Handrail height","note":"","min":863.6,"max":965.2},{"id":"room.ceiling.min","applies":"room","op":">=","unit":"mm","clause":"R305.1","label":"Ceiling height","note":"Simplified: the code has exceptions for beams, sloped ceilings and basements.","value":2133.6},{"id":"room.light.min","applies":"room","op":">=","unit":"pct","clause":"R303.1","label":"Glazing, share of floor area","note":"Simplified: lighting by artificial means is allowed in some rooms.","value":8},{"id":"room.vent.min","applies":"room","op":">=","unit":"pct","clause":"R303.1","label":"Openable area, share of floor area","note":"Simplified: mechanical ventilation is allowed instead.","value":4},{"id":"room.area.min","applies":"room","op":">=","unit":"m2","clause":"R304.1","label":"Habitable room floor area","note":"Every habitable room; kitchens are exempt. Floor under ceilings lower than 5 ft (sloped) or 7 ft (furred) does not count.","value":6.5032},{"id":"room.dim.min","applies":"room","op":">=","unit":"mm","clause":"R304.2","label":"Habitable room least dimension","note":"In any horizontal direction; kitchens are exempt.","value":2133.6},{"id":"hall.width.min","applies":"room","op":">=","unit":"mm","clause":"R311.6","label":"Hallway width","note":"","value":914.4},{"id":"door.egress.width.min","applies":"door","op":">=","unit":"mm","clause":"R311.2","label":"Egress door clear width","note":"One side-hinged egress door per dwelling unit; clear width with the door open 90 degrees (the checker estimates it as the leaf width less 2 in).","value":812.8},{"id":"door.egress.height.min","applies":"door","op":">=","unit":"mm","clause":"R311.2","label":"Egress door clear height","note":"Clear height from the top of the threshold to the bottom of the stop.","value":1981.2},{"id":"escape.area.min","applies":"window","op":">=","unit":"m2","clause":"R310.2.1","label":"Escape opening net clear area","note":"Every sleeping room (and basements, habitable attics). Grade-floor openings may be 5.0 sq ft. The checker estimates the clear opening from the window type.","value":0.5295},{"id":"escape.width.min","applies":"window","op":">=","unit":"mm","clause":"R310.2.1","label":"Escape opening clear width","note":"Net clear opening width.","value":508},{"id":"escape.height.min","applies":"window","op":">=","unit":"mm","clause":"R310.2.1","label":"Escape opening clear height","note":"Net clear opening height.","value":609.6},{"id":"escape.sill.max","applies":"window","op":"<=","unit":"mm","clause":"R310.2.2","label":"Escape opening sill height","note":"Measured from the floor to the bottom of the clear opening.","value":1117.6}]},"source_attrs":{},"license":{"id":"CC0-1.0","holder":"CadCraft","attribution":"“United States: International Residential Code 2015” by CadCraft (https://codes.iccsafe.org/content/IRC2015/chapter-3-building-planning), CC0 (https://creativecommons.org/publicdomain/zero/1.0/)","url":"https://creativecommons.org/publicdomain/zero/1.0/"},"provenance":{"library":"librarycraft","item":"8cc7732d-6d05-4ab7-8f81-7b05ce8aa58f","version":3,"sha256":"4484769ef3043aac36481e10f618a4f875bc35b3ad98dbaf888b17603f028f20","source_file":"us-irc-2015.json","source_sha256":"bc168413440d53c86a470a9a5d0b87b474008add5af23fe34905b4a828a75031","published_at":"2026-10-27T02:07:27Z"}}