Building codes & construction
Occupancy classification
The CBC's use-based grouping of buildings (R-2 apartments, S-2 parking, B office, M retail) that sets height, area, fire, egress and accessibility requirements.
Definition
Occupancy classification is the code's use-based sorting of buildings and spaces into groups — Group R-2 for apartments, R-1 for transient lodging, R-3 for small residential, S-2 for enclosed parking, B and M for offices and retail — under Chapter 3 of the California Building Code. The assigned group, not the marketing label, drives nearly every downstream requirement: allowable height and area, required separations between mixed uses, sprinkler thresholds, egress design, accessibility scope and energy provisions.
Why it matters in an underwrite
A typical podium deal stacks three classifications — R-2 over S-2 parking with M or B space at grade — and each boundary carries separation and protection requirements that belong in the budget from day one. Classification is also where operating strategies quietly change the code: run apartments as short-term rentals (stays under 30 days) and the building drifts from R-2 toward R-1, with hotel-grade life-safety expectations attached.
Sources & related guides
See also
See the term in the law itself
Read the controlling text in the Code Library, or ask the AI how it applies to your project.
Last reviewed 2026-07-29. General information, not legal advice.