Colusa County · Building on your lot
Building on your lot in Colusa County
Colusa County's code applies only in unincorporated areas. There, fence height depends on the yard, the zone and how open the fence is, and the code also limits accessory structures and home businesses.
Key points
- Front yard fences: County rule: in residential required front yard setbacks, fences are limited to 3 ft and not solid; in R-R, 4 ft if 75% open.
- Setback fences: County rule: fences in any setback in any residential zone are limited to 7 ft.
- Corner lots: County rule: in a 30 ft corner-lot triangle, fences are at most 3 ft and not solid; R-R allows 4 ft if 75% open.
- Building height: County rule: structures, including accessory structures, are limited to 30 ft in R-R, R-1 and R-2 zones and 40 ft in R-3 and R-4.
- Setbacks: County rule: accessory structures need a 5 ft rear setback and a 3 ft interior side setback in the rear 50% of the lot.
- Home business: County rule: most home businesses need an administrative permit and may use at most 25% of the home's floor space.
Each rule below is marked Colusa County code or CA state law and links to the section it comes from (checked October 2026). General information, not legal advice.
Colusa County's code applies in the unincorporated areas of the county. Cities in Colusa County have their own codes and their own pages.
Fences and walls
| Corner visibility |
|
|---|---|
| Height anywhere on the lot |
|
| Front yard height |
|
| Side and rear yard height |
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Sheds, garages and other accessory structures
| Maximum height |
|
|---|---|
| Size or lot coverage |
|
| Side and rear setback |
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| Distance from the house |
|
Running a business from home
| Space used |
|
|---|---|
| Employees |
|
| Permit |
|
| Businesses not allowed |
|
Solar panels and EV chargers
| EV charger permit |
|
|---|---|
| Review time |
|
Pets, chickens and bees
| Pet limit |
|
|---|
Who this affects
Frequently asked questions
How tall can a fence be in Colusa County?
County rule: in residential required front yard setbacks, fences are limited to 3 ft and not solid; in R-R, 4 ft if 75% open. County rule: fences in any setback in any residential zone are limited to 7 ft. County rule: in a 30 ft corner-lot triangle, fences are at most 3 ft and not solid; R-R allows 4 ft if 75% open.
How big can a shed or accessory building be in Colusa County?
County rule: structures, including accessory structures, are limited to 30 ft in R-R, R-1 and R-2 zones and 40 ft in R-3 and R-4. County rule: accessory structures need a 5 ft rear setback and a 3 ft interior side setback in the rear 50% of the lot.
Can I run a business from my home in Colusa County?
County rule: most home businesses need an administrative permit and may use at most 25% of the home's floor space.
Do I need a permit for solar panels or an EV charger in Colusa County?
Colusa County's code: You can submit the permit application and supporting documents electronically. (Applies to all EV charging station permit applications.) (§ 5-44); The building official approves administratively and issues all required permits or authorizations. (Applies when the application is complete, meets the checklist and follows the article.) (§ 5-45).
Can I keep chickens or bees at my home in Colusa County?
Colusa County's code: Up to 4 small household pets. (Applies in all residential and transitional zones.) (§ 44-4.110.010); Up to 6 small household pets. (Residential and transitional zones; parcels over 10,000 square feet.) (§ 44-4.110.010).
General information, not legal advice.
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