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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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  • N1101.10.1.1

    Blown-in or Sprayed Roof and Ceiling Insulation

    • Blown or sprayed attic insulation gets depth markers, one per 300 sq ft, fixed to framing, facing the attic access, with numbers at least 1 in tall.

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

  • N1110.2.2

    Heating and Cooling Systems

    • New ducts in an addition meet N1103; extending existing ducts skips the duct test and leakage limits.

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

  • N1102.1.6

    Rooms Containing Fuel-Burning Appliances

    • In zones 3 to 8, open-combustion appliances fed by combustion air ducts sit outside the envelope or in a sealed, insulated room with a gasketed door; the air duct is R-8 through conditioned space. Direct-vent appliances are exempt.

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

  • N1108.2.7

    Renewable Energy

    • Renewables credit: permanently installed on-site capacity of at least 1.0 W per sq ft of conditioned floor area, with REC documentation.

    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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