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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 1,054 sections for San Antonio, TX, the 2024 IRC and IBC

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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)

  • M1305.1.3

    Appliances Under Floors

    • Underfloor appliances need a 22 x 30 in opening and a passage at least 30 in high, 22 in wide and no more than 20 ft long, a level 30 x 30 in service space, and masonry-lined walls if more than 12 in below grade.

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

  • G2407.5.2

    Known Air-Infiltration-Rate Method

    • Known-infiltration method: volume of 21/ACH cu ft (or 15/ACH for fan-assisted) per 1,000 Btu/h, with ACH capped at 0.60.

    International Residential Code, 2024 · Chapter 24, Fuel GasRead the full text (opens UpCodes in a new tab)

  • M1408.3

    Location

    • Floor furnace registers sit 6 in from walls, 12 in from doors and drapes, 5 ft below projecting combustibles, not on slab-on-grade, and clear of door swings by 12 in.

    International Residential Code, 2024 · Chapter 14, Heating and Cooling Equipment and AppliancesRead 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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