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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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  • N1103.6.1

    Heat or Energy Recovery Ventilation

    • Zones 6-8 require balanced HRV or ERV ventilation with sensible recovery of at least 65 percent at 32 F.

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

  • N1102.2.10.1

    Slab-on-Grade Floor Insulation Installation

    • Prescriptive slab-edge insulation runs down from the top of the slab to the table depth (not past the footing), outward insulation is covered by paving or 10 in of soil, and full-slab insulation is continuous.

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

  • N1102.5.1.2

    Air Leakage Testing

    • Every building or dwelling unit is blower-door tested at 50 Pa (RESNET 380, ASTM E779, E1827 or E3158) after all penetrations are sealed, with a signed report; heated private garages may be visually verified instead.

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

  • N1108.2.2.1

    More Efficient HVAC Equipment for Climate Zone 4

    • Zone 4 may also use a 95 percent furnace with a 7.8 HSPF2 heat pump, or a 7.8 HSPF2 / 15.2 SEER2 / 11.7 EER2 heat pump.

    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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