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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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  • 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)

  • N1103.3.7

    Duct System Testing

    • Every duct system is leak-tested at 25 Pa (RESNET 380 or ASTM E1554) at rough-in or final, with a signed report; standalone ventilation and short fully-inside systems of 10 ft or less are exempt.

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

  • N1102.6

    Maximum Fenestration

    • Even with trade-offs, average window U may not exceed 0.48 in zones 4-5 or 0.40 in 6-8, skylights 0.75 in 4-8, and SHGC 0.40 in zones 0-3; ICC 500 storm shelters are exempt.

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

  • N1108.2.3.1

    Compact Hot Water Distribution System Option

    • Compact hot water credit: no more than 16 oz of water in the pipe from the nearest hot source to each fixture; recirculation loops need demand control and a dedicated return.

    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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