Colusa R-4 zoning: height, setbacks and lot size

R-4 (General 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-4

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	50 ft § 8.05 · code text Building Height Limit: Four stories, but not exceed fifty feet.
Maximum number of stories	4 stories § 8.05 · code text Building Height Limit: Four stories, but not exceed fifty feet.
Minimum front setback	20 ft Applies: 10 ft for High Density Combining District zoning § 8.05 · code text Front Yard Setback: Twenty feet (reduced to ten feet for High Density Combining District Zoning).
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 side yards § 8.05 · code text 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, min 15 ft, max 30 ft Applies: 10 ft for High Density Combining District zoning § 8.05 · code text Rear Yard Setback: Twenty percent of lot depth, may not be less than fifteen feet, need not exceed thirty feet (reduced to ten feet for High Density Combining District Zoning).
Minimum lot size	6,000 sq ft § 8.05 · code text Lot Area: Six thousand square feet and otherwise as provided for R-3 Districts.
Maximum lot coverage	60% § 8.05 · code text Maximum Main Building Coverage: Sixty percent of lot area, but within required setbacks.

When a different number applies

The code sets other values for particular lots, buildings or locations in R-4:

Minimum front setback: 10 ft — High Density Combining District Zoning § 8.05
Minimum side setback: 15% of lot width; total of both need not exceed 15 ft — street side of a corner lot § 8.05
Minimum rear setback: 10 ft — High Density Combining District Zoning § 8.05
Maximum density: 1 unit per 1,500 sq ft — multifamily structures containing five or more dwelling units § 8.05

Not on this page

We did not find a general FAR, density limit for R-4 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

HomeownersArchitects and designersDevelopersReal estate agents

Frequently asked questions

What is the maximum building height in Colusa's R-4 zone?

50 ft — Colusa Municipal Code § 8.05.

What is the maximum number of stories in Colusa's R-4 zone?

4 stories — Colusa Municipal Code § 8.05.

What is the minimum front setback in Colusa's R-4 zone?

20 ft (10 ft for High Density Combining District zoning) — Colusa Municipal Code § 8.05.

What is the minimum side setback in Colusa's R-4 zone?

5 ft on one side and 10% of lot width on the other side; total of both need not exceed 15 ft (interior side yards) — Colusa Municipal Code § 8.05.

What is the minimum rear setback in Colusa's R-4 zone?

20% of lot depth, min 15 ft, max 30 ft (10 ft for High Density Combining District zoning) — Colusa Municipal Code § 8.05.

General information, not legal advice.