Ventura County · Zoning · RO
Ventura County RO zoning: height, setbacks and lot size
In Ventura County's RO zone, buildings can be up to 25 ft tall, the front setback is 20 ft and the minimum lot size is 20,000 sq. ft. (Ventura County code, read October 2026).
Key points
- Maximum building height: 25 ft
- Minimum front setback: 20 ft
- Minimum side setback: 5 ft (Interior and Corner Lots, Except Reverse Corner)
- Minimum rear setback: 15 ft
- Minimum lot size: 20,000 sq. ft.
RO is a zoning district in Ventura County. Every value below was read from the Ventura 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 RO
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 | 25 ft § 8106-1.1 · code textTable row “RO”, column “Principal Structure”: 25 ft |
|---|---|
| Minimum front setback | 20 ft § 8106-1.1 · code textTable row “RO”, column “Front”: 20 ft |
| Minimum side setback | 5 ft Applies: Interior and Corner Lots, Except Reverse Corner § 8106-1.1 · code textTable row “RO”, column “Side”: 5 ft |
| Minimum rear setback | 15 ft § 8106-1.1 · code textTable row “RO”, column “Rear”: 15 ft |
| Minimum lot size | 20,000 sq. ft. § 8106-1.1 · code textTable row “RO”, column “Minimum Lot Area 1”: 20,000 sq. ft. |
Uses in RO
Uses the code's use tables allow in RO, or allow with a permit. Each links to its page with the code section.
- Single-family home — Allowed
- Growing crops — Allowed — see note
- Horses and stables — Allowed
When a different number applies
The code sets other values for particular lots, buildings or locations in RO:
- Maximum building height: 35 ft — Height may be increased above 25 ft if each side yard setback is at least 15 ft or as specified by permit § 8106-1.1
- Minimum side setback: 10 ft — Reverse Corner Lots: Street Side § 8106-1.1
Not on this page
We did not find a general stories, lot coverage, FAR, density limit for RO in the zoning tables we read. The code may still set one elsewhere — check the Ventura County Municipal Code.
Other Ventura County zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Ventura County's RO zone?
25 ft — Ventura County Municipal Code § 8106-1.1.
What is the minimum front setback in Ventura County's RO zone?
20 ft — Ventura County Municipal Code § 8106-1.1.
What is the minimum side setback in Ventura County's RO zone?
5 ft (interior and Corner Lots, Except Reverse Corner) — Ventura County Municipal Code § 8106-1.1.
What is the minimum rear setback in Ventura County's RO zone?
15 ft — Ventura County Municipal Code § 8106-1.1.
What is the minimum lot size in Ventura County's RO zone?
20,000 sq. ft. — Ventura County Municipal Code § 8106-1.1.
General information, not legal advice.
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