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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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  • N1102.1.3

    R -Value Alternative

    • As an alternative to U-factors, insulation meets the minimum R-values of Table N1102.1.3 for the climate zone (cavity plus continuous options shown).

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

  • N1102.2.3.1

    Roof Truss Framing Separating Conditioned and Unconditioned Space

    • Vertical roof truss members separating conditioned and unconditioned space are insulated like wood-frame walls (steel per N1102.2.7).

    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)

  • N1110.2.5

    Additional Efficiency Credit Requirements for Additions

    • Additions earn at least 5 credits from Table N1108.2, unless they add under 25 percent of floor area, add no water heating or HVAC equipment, add no conditioned space, or comply by performance or ERI.

    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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