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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).

27 sections matching “IBC 506” for San Antonio, TX, the 2024 IBC

  • IBC 506.1

    General

    • Allowable floor area depends on construction type, occupancy, sprinklers and frontage on public way or open space.

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.2

    Allowable area determination

    • Allowable area comes from 506.2.1, 506.2.2 and the frontage increase in 506.3, using Table 506.2 factors.
    • Unsprinklered (NS) factors, e.g. VB: B 9,000, M 9,000, A-2/A-3 6,000, E 9,500, R-1/R-2/R-4 7,000, S-1 9,000, U 5,500; R-3 is unlimited. For these groups the sprinklered one-story factor (S1) is 4 × NS and multistory (SM) is 3 × NS.

    Works withIBC 506.2.1IBC 506.2.2IBC 506.3

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.3

    Frontage increase

    • A building must adjoin or reach a public way to get the frontage area increase per 506.3.1 to 506.3.3.

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.1.3

    Basements

    • Basements don't count toward allowable area if their total is within the one-story allowable area.

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.2.1

    Single-occupancy buildings

    • Per-story allowable area Aa = At + (NS × If). Above three stories, total area = [At + (NS × If)] × Sa, with Sa = 3 (4 with 13R); no single floor may exceed the per-story value.

    Works withIBC 506.3

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.2.2

    Mixed-occupancy buildings

    • Mixed buildings use 508.3.2 or 508.4.2 per story; above three stories the sum of each story's actual/allowable ratios may not exceed 3 (4 with 13R and separated occupancies).

    Works withIBC 508.3.2IBC 508.4.2

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.3.1

    Minimum percentage of perimeter

    • At least 25% of the perimeter must face a public way or open space reached from a street or fire lane.

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.3.2

    Minimum frontage distance

    • The open space must be at least 20 ft wide, measured from the building to the nearest interior lot line, across the full street, or to another building on the lot; use the narrowest qualifying width.

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.3.3

    Amount of increase

    • Frontage increase If from Table 506.3.3: by % of perimeter (25–50, 50–75, 75–100) and open space width (20–25, 25–30, 30+ ft): 0.17/0.21/0.25, 0.33/0.42/0.50, 0.50/0.63/0.75; interpolation allowed.

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.2.2.1

    Group H-2 or H-3 mixed occupancies

    • With H-2 or H-3 present, use 508.4.2 and apply the sprinkler increase only to non-H-2/H-3 parts.

    Works withIBC 508.4.2

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 506.3.3.1

    Section 507 buildings

    • A Section 507 building short of its 60-ft yards uses Table 506.3.3.1 with open space of 30 ft or more; If up to 1.50 at 75–100% perimeter and 55 ft.

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 503.1.2

    Buildings on same lot

    • Several buildings on one lot are treated separately, or as one building if their combined area and each one's height fit Sections 504 and 506.

    Works withIBC 504IBC 506

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 508.2.3

    Allowable building area

    • Area follows the main occupancy; accessory occupancies may total 10% of the story and each stays within its unsprinklered Table 506.2 value.

    Works withIBC 506

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead the full text (opens UpCodes in a new tab)

  • IBC 414.6.1.3

    Noncombustible construction

    • The cover is noncombustible and up to 1,500 sq ft (increasable per 506).

    Works withIBC 506

    International Building Code, 2024 · Chapter 4, Special Detailed Requirements Based on Occupancy and UseRead the full text (opens UpCodes in a new tab)

  • IBC 507.8.1.1

    Located within the building

    • Group H not on the perimeter may total 25% of its 506 allowable area.

    International Building Code, 2024 · Chapter 5, General Building Heights and AreasRead 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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