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Sec. 49.10. - Architectural objective.

Colusa County Zoning Code · 2026-06 edition · updated 2026-07-07 · Colusa County

(a)

Architectural compatibility between the accessory dwelling unit and primary dwelling unit shall be demonstrated by matching two or more of the following qualities of the accessory dwelling unit to the proposed or existing primary dwelling unit:

a.

Color;

b.

Siding material and style; or

c.

Architectural design elements and features, (e.g., roof pitch, window style, trim details).

(b)

Exterior Entrance. An accessory dwelling unit must include a separate exterior entrance.

(c)

Privacy. A balcony, window or door of a second story accessory dwelling unit shall be designed to lessen privacy impacts to adjacent properties. Appropriate design techniques include obscured glazing, window placement above eye level, screening treatments, or locating balconies, windows and doors toward the existing on-site residence.

(d)

Residential Development. A residential dwelling must already exist on the lot or shall be constructed on the lot in conjunction with the construction of the accessory dwelling unit.

Sec. 49.11. - Number per lot.

Number of Units. No more than the number of ADUs allowed by state law may be constructed on any lot.

(Ord. No. 568, 5-20-2025)

Sec. 49.12. - Parking.

(a)

One off-street parking space is required for an ADU, except as outlined below. Parking may be uncovered, compact, tandem, or located within setback areas, unless deemed infeasible by the review authority due to site constraints, topography, or fire and life safety concerns.

a.

The ADU is seven hundred fifty square feet or less or a studio unit.

b.

The ADU is within an existing primary residence or an existing accessory structure.

c.

The ADU is permitted concurrently with a new single-family or multi-family dwelling on the same lot.

d.

The ADU is created by converting or demolishing a garage, carport, or covered parking structure (no replacement parking required).

(Ord. No. 568, 5-20-2025)

Sec. 49.13 - Standards for proposed accessory structures attached to an existing or proposed accessory dwelling unit.

(a)

A proposed accessory structure with a floor area less than fifty percent of the accessory dwelling unit floor area:

a.

Shall be processed ministerially in conjunction with the accessory dwelling unit.

b.

Shall comply with the lot coverage and setback requirements of this section.

(b)

A proposed accessory structure with a floor area that exceeds fifty percent of the total floor area of the accessory dwelling unit:

a.

Is subject to any discretionary review required by this zoning code.

b.

Shall comply with lot coverage, height, and setback requirements for an accessory structure in the applicable standard zoning district or the most similar standard zoning district.

Junior accessory dwelling unit.

The following provisions are intended to set standards, in compliance with California Government Code Section 65852.22, for the development of junior accessory dwelling units so as to increase the supply of smaller and affordable housing while ensuring that such housing remains compatible with the existing neighborhood. This section does not intend to override lawful use restrictions as set forth in conditions, covenants and restrictions.

(Ord. No. 568, 5-20-2025)

Sec. 49.14. - General requirements.

A junior accessory dwelling unit:

(a)

May be located on any lot that allows single-family or multifamily dwellings and that contains only one existing or proposed single-family detached dwelling. Only one junior accessory dwelling unit shall be permitted per parcel.

(b)

Is not subject to the density requirements of the general plan but shall otherwise be consistent with the general plan text and diagrams.

(c)

Shall not be used for rentals with terms of less than thirty days.

(Ord. No. 568, 5-20-2025)

Sec. 49.15. - Reserved Sec. 49.16. - Permit requirements.

An application for a junior accessory dwelling unit that complies with all applicable requirements of this section shall be approved ministerially.

(Ord. No. 568, 5-20-2025)

Sec. 49.17. - Application and processing requirements.

(a)

Step One—Submittal. The application for a junior accessory dwelling unit permit shall be submitted to the department concurrent with an application for a building permit. In addition to the standard submittal requirements for a building permit, an application for a junior accessory dwelling unit permit shall include all the following:

a.

Plot plan. If any expansion of the foundation is required for a junior accessory dwelling unit, a plot plan, drawn to scale, showing the dimensions of the perimeter of the parcel proposed for the junior accessory dwelling unit; the location and dimensioned setbacks of all existing and proposed structures on the site and structures located within fifty feet of the site; all easements, building envelopes, and special requirements of the subdivision as shown on the final map and improvement plans, if any; and average slope calculations for the site.

b.

Floor plan. A floor plan, drawn to scale, showing the dimensions of each room, the area devoted to the junior accessory dwelling unit, and the resulting floor areas of the junior accessory dwelling unit and of the primary residence. The use of each room shall be identified, and the size and location of all windows and doors shall be clearly shown. The plan shall identify whether separate or shared sanitation facilities are proposed.

c.

Deed restrictions. Deed restrictions completed, signed and ready for recordation in compliance with subsection G.

(b)

Step Two—Decision. The department shall approve or deny an application for a junior accessory dwelling unit permit within sixty days of submittal of a complete application. A junior accessory dwelling unit permit shall be issued only if the proposed junior accessory dwelling unit complies with all applicable standards in this section. A permit for a junior accessory dwelling unit shall not be denied due to the correction of nonconforming zoning conditions, building code violations, or unpermitted structures that do not present a threat to public health and safety and are not affected by the construction of the junior accessory dwelling unit.

(Ord. No. 568, 5-20-2025)

Sec. 49.18. - Utility connection fees.

No new or separate utility connection and no connection fee for water, sewer, or power is required for a junior accessory dwelling unit.

(Ord. No. 568, 5-20-2025)

Sec. 49.19. - Development standards.

A junior accessory dwelling unit permit shall be issued only if the unit complies with the following development standards:

(a)

Maximum floor area. The junior accessory dwelling unit shall not exceed five hundred square feet in total floor area.

(b)

Existing development. The junior accessory dwelling unit shall be contained entirely within the existing walls of an existing or proposed single-family dwelling, which includes the walls of an attached garage. However, an additional one hundred fifty square feet is permitted to allow for a separate entrance into the unit.

(c)

Kitchen. The junior accessory dwelling unit must contain an efficiency kitchen as defined by the Government Code Section 66333(f)(1) and (f)(2)

(d)

Sanitation. Bathroom facilities may be separate from or shared with the single-family dwelling. A separate bathroom facility shall be provided if the junior accessory dwelling unit does not include an interior entry into the primary residence.

(e)

Entrance. The junior accessory dwelling unit shall include an exterior entrance separate from the main entrance to the single-family dwelling. The junior accessory dwelling unit may include a second interior doorway for sound attenuation.

(f)

Parking. Off-street parking shall not be required for junior accessory dwelling units. No replacement offstreet parking spaces are required when a junior accessory dwelling unit is created through the conversion or demolition of an attached garage, carport or covered parking structure.

(Ord. No. 568, 5-20-2025)

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