Colusa · Zoning · R-3
Colusa R-3 zoning: height, setbacks and lot size
In Colusa's R-3 zone, buildings can be up to 35 ft tall and the front setback is 20 ft (Colusa code, read October 2026).
Key points
- Maximum building height: 35 ft
- Minimum front setback: 20 ft
- Minimum side setback: 5 ft on one side and 10% of lot width on the other side; total of both need not exceed 15 ft (interior lots)
- Minimum rear setback: 20% of lot depth, minimum 15 ft, maximum 30 ft
- Maximum lot coverage: 40%
R-3 (Neighborhood Apartment District) is a zoning district in Colusa. Every value below was read from the Colusa 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 R-3
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 § 7.05 · code textBuilding Height Limit: Two and one-half stories, but not to exceed thirty-five feet. |
|---|---|
| Minimum front setback | 20 ft § 7.05 · code textFront Yard Setback: Twenty feet. |
| Minimum side setback | 5 ft on one side and 10% of lot width on the other side; total of both need not exceed 15 ft Applies: interior lots § 7.05 · code textInterior Lots: Each interior side yard shall be not less than five feet on one side and ten percent of the lot width on the other side, but the total of both need not exceed fifteen feet. |
| Minimum rear setback | 20% of lot depth, minimum 15 ft, maximum 30 ft § 7.05 · code textRear Yard Setback: Twenty percent of the lot depth, may not be less than fifteen feet, need not exceed thirty feet. |
| Maximum lot coverage | 40% § 7.05 · code textMaximum Main Building Coverage: Forty percent of lot area. |
When a different number applies
The code sets other values for particular lots, buildings or locations in R-3:
- Minimum side setback: 15% of lot width, maximum 15 ft — street side of a corner lot § 7.05
- Minimum side setback: 5 ft — interior side yard of a corner lot § 7.05
- Minimum lot size: 6,000 sq ft — single family dwellings § 7.05
- Maximum density: 1 unit per 4,000 sq ft — duplexes § 7.05
- Maximum density: 1 unit per 2,650 sq ft — triplexes § 7.05
- Maximum density: 1 unit per 2,000 sq ft — quadraplexes § 7.05
Not on this page
We did not find a general stories, lot size, FAR, density limit for R-3 in the zoning tables we read. The code may still set one elsewhere — check the Colusa Municipal Code.
Other Colusa zoning districts
Who this affects
Frequently asked questions
What is the maximum building height in Colusa's R-3 zone?
35 ft — Colusa Municipal Code § 7.05.
What is the minimum front setback in Colusa's R-3 zone?
20 ft — Colusa Municipal Code § 7.05.
What is the minimum side setback in Colusa's R-3 zone?
5 ft on one side and 10% of lot width on the other side; total of both need not exceed 15 ft (interior lots) — Colusa Municipal Code § 7.05.
What is the minimum rear setback in Colusa's R-3 zone?
20% of lot depth, minimum 15 ft, maximum 30 ft — Colusa Municipal Code § 7.05.
What is the maximum lot coverage in Colusa's R-3 zone?
40% — Colusa Municipal Code § 7.05.
General information, not legal advice.
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