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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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  • M1305.1.2

    Appliances in Attics

    • Attic appliances need a 20 x 30 in opening and a passage at least 30 in high and 22 in wide, no more than 20 ft long, floored at least 24 in wide, with a level 30 x 30 in service space where access is needed.

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

  • E3905.1.7

    Wiring Methods With Interior Access

    • Wireways, multioutlet assemblies, gutters and surface raceways with accessible removable covers need no separate boxes (NEC 300.15(A)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • R408.8

    Under-Floor Vapor Retarder

    • In warm-humid zones 1A, 2A and 3A, floor insulation over a vented crawl space carries a vapor retarder of 1.5 perms or less on its exposed face.

    Local review: San Antonio (Bexar County) is climate zone 2A, so this applies to vented crawl spaces there.

    International Residential Code, 2024 · Chapter 4, FoundationsRead the full text (opens UpCodes in a new tab)

  • P2909.2

    Reverse Osmosis Drinking Water Treatment Units

    • Residential RO units meet NSF 58 or CSA B483.1 and drain through an air gap.

    International Residential Code, 2024 · Chapter 29, Water Supply and DistributionRead 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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