Sonoma County · Zoning · CO
Sonoma County CO zoning: height, setbacks and lot size
In Sonoma County's CO zone, generally buildings can be up to 35 ft. tall, the front setback is 15 ft. and the minimum lot size is 8,000 sq. ft., with the conditions listed below (Sonoma County code, read October 2026).
Key points
- Maximum building height: 35 ft.
- Minimum front setback: 15 ft.
- Minimum lot size: 8,000 sq. ft. (Lots with public sewer service or with both public sewer and public water service)
- Maximum lot coverage: 50%
CO is a zoning district in Sonoma County. Every value below was read from the Sonoma County Municipal Code and links to its section (read October 2026). State laws such as the ADU and SB 9 rules can allow more on a residential lot. General information, not legal advice — read the code text and check with the city before you build.
Development standards in CO
The general rule for a typical lot in this zone. Zoning tables often attach notes, such as rules for corner lots, lots next to a residential zone, or new subdivisions only. Open “code text” under a value to see the table cell or sentence it was read from.
| Maximum building height | 35 ft. § 26-10-040 · code textTable row “Height (max. ft.)”, column “CO Zone”: 35 ft. |
|---|---|
| Minimum front setback | 15 ft. § 26-10-040 · code text1. Front property line: fifteen feet (15'). |
| Minimum lot size | 8,000 sq. ft. Applies: Lots with public sewer service or with both public sewer and public water service § 26-10-040 · code textTable row “Lot size for lots with public sewer service or with both public sewer and public water service (min.)”, column “CO Zone”: 8,000 sq. ft. |
| Maximum lot coverage | 50% § 26-10-040 · code textTable row “Lot Coverage (max.)”, column “CO Zone”: 50% |
Uses in CO
Uses the code's use tables allow in CO, or allow with a permit. Each links to its page with the code section.
- Single-family home — Needs a conditional use permit
When a different number applies
The code sets other values for particular lots, buildings or locations in CO:
- Minimum lot size: 1 acre — Lots with public water service and no public sewer service § 26-10-040
- Minimum lot size: 1.5 acres — Lots with no public water service and no public sewer service § 26-10-040
Not on this page
We did not find a general stories, side setback, rear setback, FAR, density limit for CO in the zoning tables we read. The code may still set one elsewhere — check the Sonoma County Municipal Code.
Other Sonoma County zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Sonoma County's CO zone?
35 ft. — Sonoma County Municipal Code § 26-10-040.
What is the minimum front setback in Sonoma County's CO zone?
15 ft. — Sonoma County Municipal Code § 26-10-040.
What is the minimum lot size in Sonoma County's CO zone?
8,000 sq. ft. (lots with public sewer service or with both public sewer and public water service) — Sonoma County Municipal Code § 26-10-040.
What is the maximum lot coverage in Sonoma County's CO zone?
50% — Sonoma County Municipal Code § 26-10-040.
General information, not legal advice.
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