For a house, the number that actually limits you comes from your parcel's zoning district — your city or county sets it, and it is usually well below anything in the state code. Find it in three steps: (1) look up your parcel's zoning district on your city or county's zoning map or parcel lookup; (2) open that jurisdiction's zoning ordinance and read the development standards table for that district, which gives the maximum height in feet and often in stories as well; (3) check for overlay districts — hillside, historic, airport, or view-corridor overlays can lower it further. The California Building Code limits below are a separate and much higher ceiling set for fire safety, not your zoning limit, and the state housing overlays apply only if your site qualifies for one. Where more than one applies, you must satisfy all of them, so the lowest governs.
How to use the CBC table for homes
- Identify occupancy: R‑1 (transient), R‑2 (multifamily), R‑3 (one- and two‑unit, etc.), or R‑4 (§ 504.3 table rows).
- Determine construction type (I–V; A/B) and whether your design uses NS, S13D, S13R, or “S” sprinkler categories (§ 504.1; Table § 504.3).
- Read the “Allowable building height in feet above grade plane” for your row/column. Illustrative R‑group limits from § 504.3 include:
- R‑3: Type V‑B = 40 ft (NS or S13D) or 60 ft (S13R); Type V‑A = 50 ft (NS or S13D) or up to 70 ft where “S” applies without area increase.
- R‑2 (S13R): Type II‑B = 55 ft; Type V‑A = 50 ft; Type V‑B = 40 ft.
State overlays that change the “applicable” height
- AB 2011 corridor sites: greater of local zoning or state floors of 35 ft (<100‑ft corridor), **45 ft** (≥100‑ft corridor), or **65 ft** if within 1/2 mile of a major transit stop in a city >100,000 and not in the coastal zone; campus zones: 45 ft or 65 ft (§ 65912.123(c)).
Rooftops and what can extend above the limit
- Rooftop towers/spires/steeples and similar structures: unlimited height if noncombustible; if combustible, limited to 20 ft above the allowable building height and not for habitation/storage (§ 504.3 Exception).
- Occupiable roofs do not count toward “building height” or “number of stories” if § 503.1.4 is met; enclosures over occupiable roof areas are limited to 48 inches above the roof surface, with narrow exceptions (§ 503.1.4; § 503.1.4.1).
What the provided text does not supply: the specific “height allowed on the parcel by the local government” referenced in § 65912.123(c)(1); you must obtain that local zoning height separately.