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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 1,598 sections for San Antonio, TX, the 2024 IRC

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  • R602.6

    Drilling and Notching of Studs

    • Notches are at most 25% of stud depth in exterior or bearing walls and 40% in partitions; holes are at most 60% of depth, 5/8 in from the edge, and not where there's a notch.
    • Holes over 40% in exterior or bearing studs need doubled studs, and no more than two doubled studs in a row may be bored that way.

    International Residential Code, 2024 · Chapter 6, Wall ConstructionRead the full text (opens UpCodes in a new tab)

  • R320.5

    Continuity

    • Handrails run the full flight from the top nosing to the bottom nosing and return to the wall or post with a gap of 1/4 in or less.

    International Residential Code, 2024 · Chapter 3, Building PlanningRead the full text (opens UpCodes in a new tab)

  • R905.2.5

    Fasteners

    • Shingle nails are galvanized, stainless, aluminum or copper, 12-gauge with a 3/8 in head, reaching 3/4 in into the deck (or through thinner decks); at least four per strip shingle.

    International Residential Code, 2024 · Chapter 9, Roof AssembliesRead the full text (opens UpCodes in a new tab)

  • R404.1.4.2

    Concrete Foundation Walls

    • In SDC D, plain concrete walls are at most 8 ft tall with 4 ft of backfill and at least 7.5 in thick (6 in if 4 ft 6 in tall or less); walls the tables allow plain still get No. 4 bars at 48 in.

    International Residential Code, 2024 · Chapter 4, FoundationsRead 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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