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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 235 sections for San Antonio, TX, the 2024 IRC

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  • N1101.11.1

    Protection of Exposed Foundation Insulation

    • Exterior foundation and slab-edge insulation gets a rigid, opaque, weather-resistant cover reaching at least 6 in below grade.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead the full text (opens UpCodes in a new tab)

  • N1108.2.4

    More Efficient Thermal Distribution System Options

    • Distribution credits: ductless or hydronic inside, all ducts and equipment inside, at least 80 percent inside, low duct leakage (2.0 or 1.75 cfm/100 sq ft), or room airflow balanced within 20 percent.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead the full text (opens UpCodes in a new tab)

  • N1111.1.1.2

    Roof, Ceiling and Attic Alterations

    • Roof, ceiling and attic insulation meets N1102.1, or an approved design that minimizes the shortfall where conditions prevent it.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead the full text (opens UpCodes in a new tab)

  • N1102.2.11.1

    Crawl Space Wall Insulation Installation

    • Crawl wall insulation runs from the sill to the top of the footing (or the crawl floor if over 24 in below grade), and exposed earth gets a sealed Class I vapor retarder lapped 6 in and run 6 in up the walls.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead 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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