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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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  • N1101.7

    Climate Zones

    • Use Figure or Table N1101.7 to find the climate zone by county; unlisted places use N1101.7.2. Moisture letters are A moist, B dry, C marine; an asterisk marks Warm Humid.

    Local review: San Antonio is in Bexar County, climate zone 2A and Warm Humid. Nearby counties differ (Kendall 3A, Medina 2B), so check the county for sites outside the city.

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

  • N1101.5.2

    Solar-Ready System

    • Where a solar-ready zone is provided, the plans show its roof area, dead, live and snow loads, and the conduit or plumbing route to the panel or water heater.

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

  • N1103.6.2

    Fan Efficacy for Whole-House Mechanical Ventilation Systems and Outdoor Air Ventilation

    • Whole-house ventilation fans meet listed efficacy minimums in cfm per watt.

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

  • N1101.7.2

    Climate Zone Definitions

    • For unlisted places, the thermal zone comes from degree-days and the moisture letter from Marine, Dry and Humid tests on temperature and precipitation.

    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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