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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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  • R1003.5

    Corbeling

    • Chimneys corbel out no more than half their wall thickness, and not from walls under 12 in thick unless equal on both sides; each course projects no more than half the unit height or a third of its bed depth.

    International Residential Code, 2024 · Chapter 10, Chimneys and FireplacesRead the full text (opens UpCodes in a new tab)

  • R1005.3

    Solid-Fuel Appliances

    • In dwellings, factory-built chimneys for solid-fuel appliances meet UL 103 Type HT and carry its markings; chimneys for open fireplaces need UL 103 without the HT rating.

    International Residential Code, 2024 · Chapter 10, Chimneys and FireplacesRead the full text (opens UpCodes in a new tab)

  • R408.4

    Access

    • Every under-floor space has access: at least 18 x 24 in through the floor or 16 x 24 in through a wall, with an areaway if below grade, and never under a door.

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

  • R404.1.3.2.2

    Concrete Foundation Stem Walls Supporting Light-Frame Above-Grade Walls

    • Stem walls under light framing follow R404.1.3 up to 48 in of retained fill; more than that needs design, or a designed slab connection if the slab braces the top.

    International Residential Code, 2024 · Chapter 4, FoundationsRead 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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