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IBC Chapter 5 — General Building Heights and Areas

Updated Mar 25, 2026

Allowable building heights and areas based on occupancy classification and construction type, with increases for sprinklers, frontage, and other factors.

Section 504: Building height — Table 504.3 provides maximum height in feet by occupancy and construction type. Type IA: unlimited for B, F, M, S. Type IIA: 65-85 ft depending on occupancy. Section 506: Allowable area — Table 506.2 provides maximum area per story by occupancy and type. Unlimited area: 1-story sprinklered buildings of Type IIB or higher with 60 ft frontage and fire-department access. Section 504.2: Automatic sprinkler increase — add 20 ft to allowable height for NFPA 13 systems. Section 506.3: Frontage increase — percentage increase based on frontage on public way or open space >20 ft wide. Section 507: Unlimited area buildings — 1-story, sprinklered, 60 ft access. Section 510: Special provisions — podium buildings (Type IA 1st story + lesser above), horizontal/vertical building separations.

TAGS

IBC building-height allowable-area construction-type sprinkler-increase

DETAILS

tables

["504.3","504.4","506.2"]

code year

2024

code system

IBC

code section

Chapter 5

RELATED KNOWLEDGE

IBC 903.2.1 — Group A Occupancies (Sprinkler Requirements)

Automatic sprinkler system required throughout buildings with Group A occupancy where fire area exceeds 5,000 square feet, or overall building area exceeds 12,000 square feet, or occupant load of the fire area exceeds 300.

IBC 903.2.7 — Group M Occupancies (Retail Sprinkler Requirements)

Automatic sprinkler system required in Group M (mercantile) occupancies where fire area exceeds 12,000 square feet or building is more than three stories above grade.

IBC 903.2.11.3 — Buildings 55 Feet or More in Height

Automatic sprinkler system required throughout buildings with a floor level having an occupant load of 30 or more that is located 55 feet or more above the lowest level of fire department vehicle access.

IBC 1015.1 — Exit and Exit Access Doorways Required

Two exits or exit access doorways required from any space where occupant load exceeds the table values. Spaces with occupant load exceeding 500 require a minimum of 3 exits. Spaces exceeding 1,000 require 4 exits.

IBC 1017.2 — Exit Access Travel Distance

Maximum travel distance from any point in a building to an exit shall not exceed 200 feet unsprinklered or 250 feet sprinklered for most occupancies. Specific occupancies have modified limits.

IBC Table 601 — Fire-Resistance Rating Requirements

Specifies minimum fire-resistance ratings for structural elements based on construction type (Type I through V). Type IA requires 3-hour rated structural frame, 2-hour floors, and 1.5-hour roof.

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