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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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  • M1307.4.1

    Natural Ventilation

    • Naturally ventilated hydrogen spaces are 850 sq ft max, produce no more than 4 scfm per 250 sq ft, have openings at least 3 in across, and keep ignition sources 12 in below the ceiling.

    International Residential Code, 2024 · Chapter 13, General Mechanical System RequirementsRead the full text (opens UpCodes in a new tab)

  • E3702.1

    Branch-Circuit Voltage Limitations

    • Circuits feeding luminaires or cord loads up to 1,440 VA or under 1/4 hp are 120 V max between conductors; larger equipment may be 120 or 240 V (NEC 210.6).

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

  • M2203.5

    Vent Termination

    • Vents end outdoors at least 2 ft from openings with a weatherproof cap of full vent area, above snow level.

    International Residential Code, 2024 · Chapter 22, Special Piping and Storage SystemsRead the full text (opens UpCodes in a new tab)

  • R503.2.2

    Allowable Spans

    • Panel subfloor spans follow the span rating table or APA E30; the common subfloor ratings are 16, 20, 24, 32 and 48 in on center.
    • Sanded plywood used as combination subfloor is at least 1/2 to 1 in thick depending on species group and 16 to 24 in joist spacing.

    International Residential Code, 2024 · Chapter 5, FloorsRead 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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