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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

Colusa County code What Colusa County's code adds
Corner visibility
  • No fence, wall or hedge over 3 feet high or more than 50% opaque in the corner triangle.
    Applies: Street side of corner lots, all residential zones; triangle runs 30 feet along both lot lines. R-R zone: 4 feet if 75% open.
    § 44-3.10.090.20 · code text
    On the street side of a corner lot, within a triangle formed by measuring thirty feet from the front side yard street corner down the street side yard lot line and the front yard lot line.
Height anywhere on the lot
  • At most 7 feet.
    Applies: Fences in any setback in any residential zone.
    § 44-3.10.090.20 · code text
    No fence over seven feet in height shall be allowed in any setback in any residential zone.
Front yard height
  • At most 3 feet, and not solid (more than 50% opaque).
    Applies: Required front yard setback in all residential zones; height measured from the adjacent street grade.
    § 44-3.10.090.20 · code text
    In the required front yard setback.
  • At most 4 feet, if the fence is 75% open to views.
    Applies: R-R zone only, in the required front yard setback; height measured from the adjacent street grade.
    § 44-3.10.090.20 · code text
    In the R-R zone, the maximum height allowed in subsection (a) of this section may be increased to four feet for such structures when measured from the elevation of the adjacent street grade which are seventy-five percent open to views through the fence.
Side and rear yard height
  • At most 3 feet and not solid, within 10 feet of the street side line of a corner lot.
    Applies: Residential zones; within 5 feet instead between the rear line and 15 feet behind the house's front corner, if no traffic sight obstruction.
    § 44-3.10.090.20 · code text
    On the street side of a corner lot, no closer than ten feet to the street side property line, except that such structures may come to within five feet from the street side property line between the rear property line and a point set back fifteen feet from the front corner of the residence closest to the street side yard; provided, that the structure does not pose a traffic sight obstruction.
  • At most 4 feet, if the fence is 75% open to views.
    Applies: R-R zone only; street side of corner lots, where the 3-foot limit applies; height measured from the adjacent street grade.
    § 44-3.10.090.20 · code text
    In the R-R zone, the maximum height allowed in subsection (a) of this section may be increased to four feet for such structures when measured from the elevation of the adjacent street grade which are seventy-five percent open to views through the fence.

Sheds, garages and other accessory structures

Colusa County code What Colusa County's code adds
Maximum height
  • At most 30 feet.
    Applies: All structures, including accessory structures, in the R-R, R-1 and R-2 zones.
    § 44-2.30.20 · code text
    Maximum Structure Height | 30 ft | 30 ft | 30 ft | 40 ft | 40 ft
  • At most 40 feet.
    Applies: All structures, including accessory structures, in the R-3 and R-4 zones.
    § 44-2.30.20 · code text
    Maximum Structure Height | 30 ft | 30 ft | 30 ft | 40 ft | 40 ft
Size or lot coverage
  • One story and no larger than 600 square feet.
    Applies: Flood rules only: detached garages or storage buildings used only for parking or storage, below base flood elevation in a special flood hazard area.
    § 33-10.1 · code text
    Are one story and not larger than six hundred square feet in area when located in special flood hazard areas other than coastal high hazard areas.
Side and rear setback
  • At least 5 feet from the rear lot line.
    Applies: Accessory structures in all residential zones.
    § 44-2.30.20 · code text
    Minimum Setbacks Accessory Structure [1] | Rear | 5 ft | 5 ft | 5 ft | 5 ft | 5 ft
  • At least 5 feet from the interior side lot line.
    Applies: Accessory structures in the front 50% of the lot.
    § 44-2.30.20 · code text
    Minimum Setbacks Accessory Structure [1] | Interior Side | 5 ft [2] 3 ft [3] | 5 ft [2] 3 ft [3] | 5 ft [2] 3 ft [3] | 5 ft [2] 3 ft [3] | 5 ft [2] 3 ft [3]
  • At least 3 feet from the interior side lot line.
    Applies: Accessory structures in the rear 50% of the lot.
    § 44-2.30.20 · code text
    Minimum Setbacks Accessory Structure [1] | Interior Side | 5 ft [2] 3 ft [3] | 5 ft [2] 3 ft [3] | 5 ft [2] 3 ft [3] | 5 ft [2] 3 ft [3] | 5 ft [2] 3 ft [3]
Distance from the house
  • At least 5 feet from any building.
    Applies: Detached accessory buildings.
    § 44-2.30.20 · code text
    Detached accessory buildings must be 5 feet from any building.

Running a business from home

Colusa County code What Colusa County's code adds
Space used
  • At most 25% of the home's floor space.
    Applies: Home businesses inside a dwelling.
    § 44-4.90 · code text
    The home occupation is confined completely within a legal structure and occupies not more than twenty-five percent of the floor space of a dwelling
  • At most 50% of the accessory building's floor space.
    Applies: Home businesses inside an accessory building.
    § 44-4.90 · code text
    The home occupation is confined completely within a legal structure and occupies not more than twenty-five percent of the floor space of a dwelling or fifty percent of that of an accessory building.
  • Growing may cover at most 50% of the rear yard outside accessory structure setbacks.
    Applies: Agricultural home businesses growing only annual flowers and vegetables for off-site sale; outdoors in the rear yard only.
    § 44-4.90 · code text
    the total cultivation area shall not exceed fifty percent of the rear yard area outside the accessory structure setback requirements.
Employees
  • No employees; only family members living in the home may do the work.
    § 44-4.90 · code text
    The home occupation is carried on by the members of the family occupying the dwelling with no other persons employed.
Permit
  • An administrative permit is required.
    Applies: Most home businesses; office-only or indoor businesses with no employees, display, storage, signs or outside sign of business register instead.
    § 44-4.90 · code text
    No home occupation shall be allowed unless an administrative permit has first been issued for such use
  • Registration with the planning department is enough.
    Applies: Businesses using only office equipment or making items inside the main building, with no employees, display, storage, signs or outside sign of business.
    § 44-4.90 · code text
    businesses utilizing only office equipment or producing items inside the primary structure with no employees, no display or storage, no signs, or no exterior indication of any business will be permitted upon the registration of such businesses with the planning department
Businesses not allowed
  • strictly retail businesses, including grocery stores and stock item stores
    § 44-4.90 · code text
    Strictly retail businesses shall not be allowed (that is, grocery stores, stock item stores, and the like).

Solar panels and EV chargers

Colusa County code What Colusa County's code adds
EV charger permit
  • You can submit the permit application and supporting documents electronically.
    Applies: Applies to all EV charging station permit applications.
    § 5-44 · code text
    The building official of the county of Colusa or his/her designee shall facilitate an expedited permitting process to administratively approve an application to install electric vehicle charging stations through the issuance of a building permit or similar nondiscretionary permit.
  • The building official approves administratively and issues all required permits or authorizations.
    Applies: Applies when the application is complete, meets the checklist and follows the article.
    § 5-45 · code text
    Upon confirmation by the building official that the application is complete and meets the requirements of the checklist and is consistent with this article, the building official shall administratively approve the application and issue all required permits or authorizations.
Review time
  • The permit is issued the same day.
    Applies: Small rooftop solar; over-the-counter applications that meet the checklist and standard plan; fees paid in person.
    § 5-35 · code text
    The department shall issue a building permit, the issuance of which is nondiscretionary, on the same day for over-the-counter applications or within one to three business days for electronic applications upon receipt of fees, which must be paid in person as the department does not have electronic capabilities to accept payments.
  • The permit is issued within 1 to 3 business days.
    Applies: Small rooftop solar; electronic applications that meet the checklist and standard plan, after fees are paid in person.
    § 5-35 · code text
    The department shall issue a building permit, the issuance of which is nondiscretionary, on the same day for over-the-counter applications or within one to three business days for electronic applications upon receipt of fees, which must be paid in person as the department does not have electronic capabilities to accept payments.

Pets, chickens and bees

Colusa County code What Colusa County's code adds
Pet limit
  • Up to 4 small household pets.
    Applies: Applies in all residential and transitional zones.
    § 44-4.110.010 · code text
    The keeping of up to four small domestic household pets is allowed in all residential and transitional zones.
  • Up to 6 small household pets.
    Applies: Residential and transitional zones; parcels over 10,000 square feet.
    § 44-4.110.010 · code text
    For parcels that exceed ten thousand square feet, up to six small domestic household pets may be kept.
  • Up to 8 small household pets, with no more than 6 of the same species.
    Applies: Residential and transitional zones; parcels over 1 acre.
    § 44-4.110.010 · code text
    For parcels that exceed one acre, up to eight small domestic household pets may be kept, provided that there are no more than six animals of the same species
  • Up to 8 puppies or kittens do not count toward the pet limit.
    § 44-4.110.010 · code text
    Up to eight immature animals (i.e., puppies and kittens) shall not count against the total number of animals allowed.

Who this affects

HomeownersContractorsDesigners

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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