Building Setbacks & Zoning in Colusa County, CA (2026)

3 rules for unincorporated Colusa County, California.

Verified from official government sources

Note: These county rules apply to unincorporated areas of Colusa County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Setback Rules

Colusa County's Zoning Code sets minimum building setbacks by zone. In the main residential zones, primary structures need a 20-foot front setback (15 feet in R-4), a 15-to-20-foot rear setback, and a 6-to-10-foot side setback. Agricultural and commercial zones use different distances.

Colusa County Building Setback Rules

Some Restrictions

Colusa County Zoning Code Table 44-2.30-2 (Development Standards in the Residential Zones)

Minimum Setbacks (Primary Structure): Front 20 ft / 20 ft / 20 ft / 20 ft / 15 ft; Rear 20 ft / 20 ft / 15 ft / 15 ft / 15 ft; Interior Side 10 ft / 6 ft / 6 ft / 6 ft / 6 ft; Street Side 10 ft / 8 ft / 8 ft / 8 ft / 8 ft (R-R / R-1 / R-2 / R-3 / R-4).

Full ordinance details →Official source ↗

Structure Height Limits

The Colusa County Zoning Code caps building height by zone. In the residential zones, the maximum structure height is 30 feet in Rural Residential, Single-Family, and Two-Family zones, and 40 feet in the Multiple-Family and Apartment-Professional zones. Agricultural and other zones allow taller structures.

Colusa County Structure Height Limits

Some Restrictions

Colusa County Zoning Code Table 44-2.30-2 (Development Standards in the Residential Zones)

Maximum Structure Height: 30 ft / 30 ft / 30 ft / 40 ft / 40 ft (R-R / R-1 / R-2 / R-3 / R-4).

Full ordinance details →Official source ↗

Lot Coverage Limits

The Colusa County Zoning Code does not cap residential lot coverage with a percentage. It controls building bulk through setbacks and maximum structure height, uses Floor Area Ratio limits in commercial and industrial zones, and limits impervious surfaces in required residential setbacks to 50 percent.

Colusa County Lot Coverage Rules

Some Restrictions

Colusa County Zoning Code Article 44-3 (Site Planning Provisions)

In the single- and multi-family residential zones (R-1, R-2, R-3, and R-4): No more than 50 percent of required front and side setbacks may be covered with paving or other impervious surfaces.

Full ordinance details →Official source ↗

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