Sonoma County · Zoning · RR
Sonoma County RR zoning: height, setbacks and lot size
In Sonoma County's RR zone, generally buildings can be up to 35 ft tall, the front setback is 20 ft and the minimum lot size is 20,000 sq ft, with the conditions listed below (Sonoma County code, read October 2026).
Key points
- Maximum building height: 35 ft
- Minimum front setback: 20 ft
- Minimum side setback: 5 ft
- Minimum rear setback: 20 ft
- Minimum lot size: 20,000 sq ft (Lands designated “Urban Residential” on the General Plan land use map)
- Maximum lot coverage: 35%
- Maximum density: 1 unit per 1 to 20 acres (the code sets a range: at least 1, at most 20 acres per unit)
RR (RR Zone) 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 RR
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 § 26-08-040 · code textTable row “Main Building Height (max. ft.)”, column “RR Zone”: 35 |
|---|---|
| Minimum front setback | 20 ft § 26-08-040 · code textTable row “Front Property Line Setback (min. ft.)”, column “RR Zone”: 20 |
| Minimum side setback | 5 ft § 26-08-040 · code textTable row “Interior Side Property Line Setback (min. ft.)”, column “RR Zone”: 5 |
| Minimum rear setback | 20 ft § 26-08-040 · code textTable row “Rear Property Line Setback (min. ft.)”, column “RR Zone”: 20 |
| Minimum lot size | 20,000 sq ft Applies: Lands designated “Urban Residential” on the General Plan land use map § 26C-92 · code textOn lands designated "Urban Residential" on the General Plan land use map, minimum lot size shall be twenty thousand (20,000) square feet. |
| Maximum lot coverage | 35% § 26-08-040 · code textTable row “Lot Coverage (max.)”, column “RR Zone”: 35% |
| Maximum density | 1 unit per 1 to 20 acres Applies: the code sets a range: at least 1, at most 20 acres per unit § 26-08-040 · code textTable row “Acres per Dwelling Unit (min.)”, column “RR Zone”: 1-20 |
Uses in RR
Uses the code's use tables allow in RR, or allow with a permit. Each links to its page with the code section.
- Single-family home — Allowed
When a different number applies
The code sets other values for particular lots, buildings or locations in RR:
- Minimum lot size: 1.5 acres — lands designated rural residential; lots not served by public water § 26C-92
- Minimum lot size: 1 acre — lands designated rural residential on the general plan land use map and lots served by public water § 26-08-040
Not on this page
We did not find a general stories, FAR limit for RR 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 RR zone?
35 ft — Sonoma County Municipal Code § 26-08-040.
What is the minimum front setback in Sonoma County's RR zone?
20 ft — Sonoma County Municipal Code § 26-08-040.
What is the minimum side setback in Sonoma County's RR zone?
5 ft — Sonoma County Municipal Code § 26-08-040.
What is the minimum rear setback in Sonoma County's RR zone?
20 ft — Sonoma County Municipal Code § 26-08-040.
What is the minimum lot size in Sonoma County's RR zone?
20,000 sq ft (lands designated “Urban Residential” on the General Plan land use map) — Sonoma County Municipal Code § 26C-92.
General information, not legal advice.
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