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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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  • R502.8.1

    Sawn Lumber

    • Notches in sawn joists are at most one-sixth of the depth, no longer than a third of the depth, and never in the middle third of the span; end notches up to a quarter of the depth.
    • Holes in sawn joists are no bigger than a third of the depth and stay 2 in from the edges, other holes and notches.

    International Residential Code, 2024 · Chapter 5, FloorsRead the full text (opens UpCodes in a new tab)

  • R302.2.6

    Structural Independence

    • Each townhouse unit stands on its own structurally, apart from shared foundations, sheathing, coverings, flashing, rated common walls or sprinklered units.

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

  • R1001.6

    Firebox Dimensions

    • The firebox is at least 20 in deep; the throat sits at least 8 in above the opening and is at least 4 in deep; the passage above the firebox is never smaller than the flue.
    • Rumford fireplaces are allowed if at least 12 in deep and one-third the opening width, with the throat at least 12 in above the lintel and at least 1/20 of the opening area.

    International Residential Code, 2024 · Chapter 10, Chimneys and FireplacesRead the full text (opens UpCodes in a new tab)

  • R404.1.4.1

    Masonry Foundation Walls

    • In SDC D, plain masonry foundation walls are at most 8 ft tall with 4 ft of backfill, at least 8 in thick, with No. 4 verticals at 4 ft and two No. 4s in the top 12 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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