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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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  • R403.1.4.1

    Frost Protection

    • Foundations are protected from frost by going below the local frost line, a frost-protected shallow foundation, ASCE 32, or bearing on rock; never on seasonally frozen soil.
    • Frost protection isn't needed for detached light-frame sheds up to 600 sq ft, or other sheds up to 400 sq ft, with eaves of 10 ft or less.

    International Residential Code, 2024 · Chapter 4, FoundationsRead the full text (opens UpCodes in a new tab)

  • R302.15

    Fire-Retardant-Treated Wood

    • Fire-retardant-treated wood has a flame spread index of 25 or less, and in an extended 20-minute test the flame front stays within 10.5 ft.
    • Each FRTW piece is labelled, and is dried to 19% moisture or less for lumber and 15% or less for panels; interior FRTW stays at or below 28% at 92% humidity.

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

  • R408.2

    Openings for Under-Floor Ventilation

    • Vented crawl spaces need 1 sq ft of opening per 150 sq ft of floor, with one vent within 3 ft of each corner, screened to 1/4 in or less.

    International Residential Code, 2024 · Chapter 4, FoundationsRead the full text (opens UpCodes in a new tab)

  • R502.1.1

    Sawn Lumber

    • Sawn lumber carries a grade mark (or inspection certificate) from an agency accredited under DOC PS 20; treated lumber is marked per R304.2.

    International Residential Code, 2024 · Chapter 5, FloorsRead 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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