Sonoma County · Zoning · R1
Sonoma County R1 zoning: height, setbacks and lot size
In Sonoma County's R1 zone, buildings can be up to 35 ft tall, the front setback is 20 ft and the minimum lot size is 6,000 sq. ft. (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: 6,000 sq. ft.
- Maximum lot coverage: 40%
- Maximum density: 1 to 6 units per acre (the code sets a range: at least 1, at most 6 units per acre)
R1 (R1 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 R1
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 “R1 Zone”: 35 |
|---|---|
| Minimum front setback | 20 ft § 26-08-040 · code textTable row “Front Property Line Setback (min. ft.)”, column “R1 Zone”: 20 |
| Minimum side setback | 5 ft § 26-08-040 · code textTable row “Interior Side Property Line Setback (min. ft.)”, column “R1 Zone”: 5 |
| Minimum rear setback | 20 ft § 26-08-040 · code textTable row “Rear Property Line Setback (min. ft.)”, column “R1 Zone”: 20 |
| Minimum lot size | 6,000 sq. ft. § 26-08-040 · code textTable row “Lot Size (min. sq. ft.)”, column “R1 Zone”: 6,000 |
| Maximum lot coverage | 40% § 26-08-040 · code textTable row “Lot Coverage (max.)”, column “R1 Zone”: 40% |
| Maximum density | 1 to 6 units per acre Applies: the code sets a range: at least 1, at most 6 units per acre § 26-08-040 · code textTable row “Max. Dwelling Units per Acre (max.)”, column “R1 Zone”: 1-6 |
Uses in R1
Uses the code's use tables allow in R1, or allow with a permit. Each links to its page with the code section.
- Single-family home — Allowed
Not on this page
We did not find a general stories, FAR limit for R1 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 R1 zone?
35 ft — Sonoma County Municipal Code § 26-08-040.
What is the minimum front setback in Sonoma County's R1 zone?
20 ft — Sonoma County Municipal Code § 26-08-040.
What is the minimum side setback in Sonoma County's R1 zone?
5 ft — Sonoma County Municipal Code § 26-08-040.
What is the minimum rear setback in Sonoma County's R1 zone?
20 ft — Sonoma County Municipal Code § 26-08-040.
What is the minimum lot size in Sonoma County's R1 zone?
6,000 sq. ft. — Sonoma County Municipal Code § 26-08-040.
General information, not legal advice.
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