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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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  • N1103.3.7

    Duct System Testing

    • Every duct system is leak-tested at 25 Pa (RESNET 380 or ASTM E1554) at rough-in or final, with a signed report; standalone ventilation and short fully-inside systems of 10 ft or less are exempt.

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

  • N1111.1.1.1

    Fenestration Alterations

    • New or replacement windows meet Table N1102.1.3 U-factor and SHGC, averaged over all replacements if desired.

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

  • N1106.3

    Building Thermal Envelope

    • Under the ERI path, envelope TC stays within 1.08x prescriptive in zones 0-2 or 1.15x in zones 3-8, and SHGC is 0.30 max in zones 0-3.

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

  • N1110.2.5

    Additional Efficiency Credit Requirements for Additions

    • Additions earn at least 5 credits from Table N1108.2, unless they add under 25 percent of floor area, add no water heating or HVAC equipment, add no conditioned space, or comply by performance or ERI.

    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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