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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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  • N1101.10.6

    Airspaces

    • An airspace R-value counts only if the cavity is enclosed and unventilated, or behind anchored veneer with bottom-only weeps at 15 in or more and a closed top; ventilated cavities are tested to ASTM C1363.

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

  • N1102.2.2

    Ceilings Without Attics

    • Ceilings without attic space may drop to R-30 where more won't fit, uncompressed over the plate, limited to 500 sq ft or 20 percent of ceiling area, whichever is less.

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

  • N1108.2.10

    Whole-Home Lighting Control

    • Whole-home lighting credit: one switch by the main entry (or a remote system) turns off all permanent interior lights, with up to 5 percent uncontrolled.

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

  • N1108.2.5

    Improved Air Sealing and Efficient Ventilation System Options

    • Air sealing and ventilation credits: ERV or HRV, or 2.0, 1.5 or 1.0 ACH50 with ERV, HRV or balanced ventilation; recovery units need 75 percent SRE and ERVs 50 percent latent.

    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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