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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 237 sections for San Antonio, TX, the 2024 IRC and IBC

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  • N1101.10.6

    Airspaces

    • An airspace R-value counts only if the cavity is enclosed and unventilated, or behind anchored veneer with bottom-only weeps at 15 in or more and a closed top; ventilated cavities are tested to ASTM C1363.

    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)

  • N1108.2.1.3

    Roof Solar Reflectance Index

    • Low-slope roofs in zones 0-2 earn credit with a 3-year aged SRI of 75 or more over 95 percent of the roof, excluding PV, equipment, shaded and ballasted areas.

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

  • N1111.1.5

    Additional Efficiency Credit Requirements for Substantial Improvements

    • Substantial improvements earn at least 3 credits from Table N1108.2, unless done with an addition, by performance or ERI, or without new HVAC or water heating.

    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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