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Search the building code.

Every 2024 IRC section and the IBC as it loads, by number or topic, plus the local rules for your city. Free to search.

Detached houses, duplexes and townhouses up to 3 stories with their own exits use the IRC; every other building uses the IBC (IBC 101.2).

A random sample from 1,054 sections for San Antonio, TX, the 2024 IRC and IBC

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  • M1602.2

    Return Air Openings

    • Return openings sit 10 ft from open-combustion appliances in the same room, return no more than a room's supply, and are sized per instructions, Manual D or the designer.
    • Mechanical-room returns serve only that room, allow only sealed-combustion appliances, and keep door pressure to 0.01 in WC; closet returns are 30 cfm max with a 1.5 in undercut or 30 sq in grille.
    • No returns from toilet rooms, garages, unconditioned attics or direct from crawl spaces, from kitchens unless 10 ft from cooking and serving only the kitchen, from undehumidified pools, or between dwelling units.

    International Residential Code, 2024 · Chapter 16, Duct SystemsRead the full text (opens UpCodes in a new tab)

Searches all 4,276 IRC 2024 sections, 5,532 IBC 2024 sections and defined terms (Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 so far) and each city's local rules as they are added. Section numbers and titles from the International Residential Code and International Building Code, 2024 editions, copyrighted by the International Code Council; the IRC's electrical chapters (34 to 43) follow NFPA 70, the National Electrical Code. Requirements are summarized in our words (IRC Chapters 3 to 43, IBC Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33); read the full text at the link on each result. Local values come from each city's published documents.

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