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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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  • 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)

  • 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)

  • N1103.5.1.1

    Circulation Systems

    • Recirculation uses a pump (no gravity or thermosyphon) that shuts off when the loop is hot or there's no demand; a cold-line return needs a sensor within 2 ft and limits water into it to 104 F.

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

  • N1108.2.2

    More Efficient HVAC Equipment Performance Options

    • HVAC credits require listed efficiencies, e.g. ground-source 16.1 EER/3.1 COP, AC 15.2 or 16.0 SEER2 with 12.0 EER2, furnaces 90/95/97 percent AFUE, heat pumps 7.8 HSPF2 with 15.2 SEER2 and 11.7 EER2 (zones 0-3).

    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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