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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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  • R502.4

    Joists Under Bearing Partitions

    • Joists under a parallel bearing wall are sized for it; doubled joists split for pipes are blocked solid at 4 ft or less, and perpendicular walls stay within one joist depth of their support.

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

  • R610.8

    Headers

    • SIP headers are at least 11-7/8 in deep, unspliced, and span only 2 to 4 ft (longer headers follow R602.7 or panel box headers).

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

  • R504.1.1

    Unbalanced Soil Loads

    • Wood basement floors are limited to sites where fill depth on opposite walls differs by 2 ft or less, unless sliding is resisted otherwise.

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

  • R302.1

    Exterior Walls

    Used in checks
    • An unsprinklered house's exterior walls closer than 5 ft to the lot line need a 1-hour rating, tested from both sides.
    • Unsprinklered: no projections within 2 ft of the line; 1-hour underside from 2 to under 5 ft; unrated at 5 ft or more.
    • Unsprinklered: no wall openings within 3 ft; up to 25% of the wall at 3 ft to under 5 ft; unlimited at 5 ft or more.
    • Penetrations within 3 ft of the lot line are protected per R302.4.
    • A fully sprinklered house only needs rated walls (tested from outside) under 3 ft; openings are unlimited from 3 ft and projections can be rated from 2 ft.
    • In a fully sprinklered subdivision, the separation distance can drop to 0 ft where the neighbouring lot keeps an open yard of 6 ft or more.
    • Two homes on one lot measure to an imaginary line between them; townhouses measure to the lot line or an imaginary line.
    • Exempt: walls perpendicular to the line, the owner's own accessory buildings, permit-exempt sheds, and foundation vents. A detached garage within 2 ft of the line may have eaves of up to 4 in.

    International Residential Code, 2024 · Chapter 3, Building PlanningRead 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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