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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 1,598 sections for San Antonio, TX, the 2024 IRC

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  • R311.5

    Interconnectivity

    • Multiple CO alarms are interconnected (wireless is fine); existing areas are exempt unless finishes are opened or an attic, crawl or basement gives access.

    International Residential Code, 2024 · Chapter 3, Building PlanningRead the full text (opens UpCodes in a new tab)

  • R301.2.1.5

    Topographic Wind Effects

    • Where the jurisdiction flags hill speed-up damage, a house on the top half of a hill counts only if the slope is 10% or more and the hill is tall enough for its exposure.

    International Residential Code, 2024 · Chapter 3, Building PlanningRead the full text (opens UpCodes in a new tab)

  • R602.7.5

    Supports for Headers

    • Headers sit on jack studs or anchors, and exterior headers need full-height king studs: 1 to 4 per end as spans grow from 4 to 18 ft (fewer in low wind).

    International Residential Code, 2024 · Chapter 6, Wall ConstructionRead the full text (opens UpCodes in a new tab)

  • R703.10

    Fiber Cement Siding

    • Fiber-cement panels and lap siding (up to 12 in wide) meet ASTM C1186 Grade II; panel joints fall on framing and are protected; lap siding laps 1-1/4 in with ends caulked, covered or flashed.

    International Residential Code, 2024 · Chapter 7, Wall CoveringRead 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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