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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 237 sections for San Antonio, TX, the 2024 IRC and IBC

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  • N1111.1.5

    Additional Efficiency Credit Requirements for Substantial Improvements

    • Substantial improvements earn at least 3 credits from Table N1108.2, unless done with an addition, by performance or ERI, or without new HVAC or water heating.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead the full text (opens UpCodes in a new tab)

  • N1108.2

    Additional Energy Efficiency Credit Requirements

    • Prescriptive homes earn at least 10 credits from at least two measures in Table N1108.2, plus 5 more over 5,000 sq ft above grade; no interpolating between measures.

    Local review: Cities often amend the additional-credit requirement; confirm whether San Antonio's adopted energy code includes it and how many credits it requires.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead the full text (opens UpCodes in a new tab)

  • N1108.2.1.4

    Reduced Air Leakage

    • Reduced air leakage credit: measured 2.0 to 2.5 ACH50, or attached units averaging 0.24 cfm/sq ft or less.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead the full text (opens UpCodes in a new tab)

  • N1111.1.2.2

    System Sizing

    • New equipment is sized per N1103.7 for the altered building, unless shown incompatible with the remaining system.

    International Residential Code, 2024 · Chapter 11, Energy EfficiencyRead 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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