{"format":"cadcraft-library-item","format_version":1,"uuid":"0fb872b4-de48-42f4-a05b-44574830bd8d","version":3,"name":"Massachusetts: Massachusetts State Building Code, 10th Edition, Residential Code (780 CMR 51.00)","kind":"regulation","category":"regulations/building","description":"Adopts IRC 2021 (Board of Building Regulations and Standards (BBRS); 780 CMR 51.00). State amendments to the checked rules: riser height, tread depth. Amendments were researched for stairs, ceiling height, light and ventilation only; every other rule (room size, egress, escape openings, electrical, alarms) is the base code's. Entered 2026-10-27 (research confidence: medium); not yet reviewed by a…","maker":"","model":"","ifc":{"class":"IfcControl","predefined":"NOTDEFINED"},"plan":{"layers":[],"entities":[]},"body":null,"params":{},"regulation":{"format":"cadcraft-regulation-pack","version":1,"id":"us-ma","name":"Massachusetts: Massachusetts State Building Code, 10th Edition, Residential Code (780 CMR 51.00)","jurisdiction":{"country":"US","level":"state","region":"US-MA","name":"Massachusetts"},"base":"us-irc-2021","edition":"IRC 2021 as adopted, 2024-10-11","in_force":"2024-10-11","review":{"state":"draft","note":"Adopts IRC 2021 (Board of Building Regulations and Standards (BBRS); 780 CMR 51.00). State amendments to the checked rules: riser height, tread depth. Amendments were researched for stairs, ceiling height, light and ventilation only; every other rule (room size, egress, escape openings, electrical, alarms) is the base code's. Entered 2026-10-27 (research confidence: medium); not yet reviewed by a…"},"authority":"adopted-law","source":{"name":"Board of Building Regulations and Standards (BBRS), 780 CMR 51.00","url":"https://www.mass.gov/handbook/tenth-edition-of-the-ma-state-building-code-780","date":"2024-10-11","checked":"2026-10-27"},"maker":null,"price":null,"criteria":[],"tables":[],"rules":[{"id":"stair.riser.max","applies":"stair","op":"<=","unit":"mm","clause":"780 CMR 51 R311.7.5.1","label":"Riser height","note":"State amendment.","value":209.55},{"id":"stair.tread.min","applies":"stair","op":">=","unit":"mm","clause":"780 CMR 51 R311.7.5.2","label":"Tread depth","note":"State amendment.","value":228.6}]},"source_attrs":{},"license":{"id":"CC0-1.0","holder":"CadCraft","attribution":"“Massachusetts: Massachusetts State Building Code, 10th Edition, Residential Code (780 CMR 51.00)” by CadCraft (https://www.mass.gov/handbook/tenth-edition-of-the-ma-state-building-code-780), CC0 (https://creativecommons.org/publicdomain/zero/1.0/)","url":"https://creativecommons.org/publicdomain/zero/1.0/"},"provenance":{"library":"librarycraft","item":"0fb872b4-de48-42f4-a05b-44574830bd8d","version":3,"sha256":"e17222008dd0801f19aacfa02e3120a368a06404493d02182a8f32e21e61311b","source_file":"us-ma.json","source_sha256":"add82be972d451f16a81723e5b21fc14e452f5d0d862053c4182407cc76cc95e","published_at":"2026-10-27T02:07:27Z"}}