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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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  • N1102.1.2

    Insulation and Fenestration Criteria

    • Assemblies and windows meet the maximum U-factors, F-factors and SHGC of Table N1102.1.2 for the climate zone.

    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)

  • N1103.3.8

    Duct System Leakage

    • Total duct leakage stays within Table N1103.3.8, set by floor area served, number of ducted returns and duct location.

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

  • N1101.13

    Application

    • Residential buildings comply by one of four paths: prescriptive, simulated performance, Energy Rating Index, or tropical; work on existing buildings follows N1109.

    Local review: Texas sets a statewide minimum residential energy code and cities adopt their own edition with amendments; confirm the energy code edition San Antonio has adopted before relying on 2024 values.

    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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