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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 4,296 sections for San Antonio, TX, the 2024 IRC

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  • E3701.2.2

    Ampacity Adjustment or Correction

    • Conductors also carry the maximum load after correction and adjustment factors; a feeder neutral not on an overcurrent device may be sized at 100% (NEC 210.19(A), 215.2(A)).

    International Residential Code, 2024 · Chapter 37, Branch Circuit and Feeder RequirementsRead the full text (opens UpCodes in a new tab)

  • R802.5.2

    Ceiling Joist and Rafter Connections

    • Ceiling joists in the bottom third of the rafter height are nailed to the rafters per the heel joint table; higher joists, or joists running the other way without rafter ties, require a beam ridge.
    • Heel nailing rises as ties move up: x1.11 at 1/10 of the rise or less, up to x1.5 at one-third; above a third, the connection is designed.

    International Residential Code, 2024 · Chapter 8, Roof-Ceiling ConstructionRead the full text (opens UpCodes in a new tab)

  • N1102.2.10.2

    Alternative Slab-on-Grade Insulation Configurations

    • Under the performance or ERI paths, slab insulation follows the proposed or rated design.

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

  • N1104.1.2

    Exterior Lighting Power Requirements

    • Total connected exterior lighting stays within the allowance, excluding safety, emergency, exit, signal, athletic, temporary, art, pool, in-unit and egress lighting.

    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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