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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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  • N1103.13.1

    Gas Fireplace Efficiency

    • Vented gas fireplace heaters have at least 50 percent fireplace efficiency (CSA P.4.1) and Z21.88 listing; decorative units are Z21.50 listed.

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

  • N1101.10.2

    Insulation Mark Installation

    • Insulation is installed so its R-value mark can be seen at inspection; unmarked blown or draped products get a posted installer certificate.

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

  • N1101.10.3

    Fenestration Product Rating

    • Window, door and skylight U-factors come from NFRC 100 and SHGC and VT from NFRC 200, by an accredited lab and labelled; unlabelled products take the default tables.

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

  • N1101.5

    Information on Construction Documents

    • Energy details on the plans: compliance path, insulation R-values, window U and SHGC with area-weighted calcs, mechanical design criteria, equipment sizes and efficiencies, controls, duct and pipe insulation and sealing, and air sealing.

    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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