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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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  • N1102.2.1

    Ceilings With Attics

    • Where R-38 is required, R-30 over the whole ceiling counts if it runs full height over the top plate at the eaves; likewise R-38 for R-49. Not for the U-factor or UA routes.

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

  • N1104.3.1

    Controls for Individual Dwelling Units

    • Over 30 W of exterior lighting needs a manual switch, daylight shutoff, and any override must revert within 24 hours.

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

  • N1102.2.5

    Access Hatches and Doors

    • Access hatches and doors to attics and crawl spaces are insulated like the surrounding assembly; in zones 0-4 pull-down stairs may be R-10 average (R-13 over 75 percent), 13.5 sq ft max, weatherstripped.

    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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