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Article 49 — Accessory Dwelling Units and Junior Accessory Dwelling Units.

Sec. 49.03. - Permit requirements.

Colusa Zoning Code · 2026-06 edition · updated 2026-09-09 · Colusa

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

(a)

If the department, together with utility providers and county environmental health when a septic system is utilized, has not approved or denied the completed application within sixty days, the application shall be deemed approved. If the department denies an application for an accessory dwelling unit or junior accessory dwelling unit, it shall provide in writing a full set of comments to the applicant with a list of items that are defective or deficient and a description of how the application can be remedied by the applicant.

(b)

A permit 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 accessory dwelling unit.

(c)

A permit shall not be denied for an unpermitted accessory dwelling unit that was constructed before January 1, 2018, because, among other conditions, the unit is in violation of building standards or state or local standards applicable to accessory dwelling units, unless the department finds that correcting the violation is necessary to protect the health and safety of the public or occupants of the structure.

(d)

A demolition permit for a detached garage that is to be replaced with an accessory dwelling unit shall be reviewed with the application for the accessory dwelling unit and issued at the same time. The applicant is not required to provide written notice or post a placard for the demolition of a detached garage that is to be replaced with an accessory dwelling unit.

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

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▸Contents — Colusa Zoning Code
Colusa Zoning Code
  1. Article 1 — Findings and Adoption of Zoning (District) Plan.
  2. Article 2 — Designation of Districts.
  3. Article 3 — Establishment of Districts.
  4. Article 4 — Definitions.
  5. Article 5 — R-1 Single Family Residence District—Regulations.
  6. Article 8 — R-4 General Apartment District—Regulations.
  7. Article 9 — C-N Neighborhood Business District—Regulations.
  8. Article 10 — C-G General Commercial District—Regulations.
  9. Article 11 — C-H Highway Service Commercial District— Regulati…
  10. Article 12 — M-1 Light Industrial District—Regulations.
  11. Article 13 — M-2 General Industrial District—Regulations.
  12. Article 14 — M-L Limited Manufacturing District—Regulations.
  13. Article 15 — P-D Planned Development District—Regulations.
  14. Article 16 — P-F Public Facilities District—Regulations.
  15. Article 17 — O-S Open Space District—Regulations.
  16. Article 18 — F-W Floodway District—Regulations.
  17. Article 19 — "A" Agricultural Combining Districts—Regulations.
  18. Article 20 — "B" Special Building Site Combining District— Reg…
  19. Article 21 — "CD" Special Civic District Combining District— R…
  20. Article 21.5 — Cannabis Regulations.
  21. Article 22 — "F" Special Highway Frontage Combining District— …
  22. Article 23 — "FP" Special Floodplain Combining District—
  23. Article 24 — "H" Special Height Combining District—Regulations.
  24. Article 25 — "P" Special Parking Combining District—Regulations.
  25. Article 26 — "O" Special Divided Ownership—Regulations.
  26. Article 27 — "A-O" Special Adult-Oriented Combining District— …
  27. Article 28 — Fire Zones.
  28. Article 29 — Off-Street Parking Requirements.
  29. Article 30 — Landmark and Historic Preservation.
  30. Article 31 — Outdoor Advertising and Sign Regulations.
  31. Article 33 — Use Permits.
  32. Article 34 — Variances.
  33. Article 35 — Nonconforming Uses.
  34. Article 36 — Amendments, Alterations, Changes in Districts.
  35. Article 37 — Enforcement, Legal Procedure, Penalties.
  36. Article 38 — Repealing.
  37. Article 39 — Floodplain Management.
  38. Article 40 — Dedication of Lands for Park and Recreational Pur…
  39. Article 41 — Density Bonus.
  40. Article 41.5 — By Right Housing Projects.
  41. Article 42 — High Density Housing Combining District.
  42. Article 43 — Reasonable Accommodations.
  43. Article 44 — "M-U-B" Bridge Street Mixed-Use District— Regulat…
  44. Article 45 — "M-U-D" Downtown Mixed Use District—Regulations.
  45. Article 46 — "M-U-M" Main Street Mixed Use District—Regulations.
  46. Article 47 — "M-U-R" Residential Mixed-Use District—Regulations.
  47. Article 48 — Mixed Use Districts Table.
  48. ▸Article 49 — Accessory Dwelling Units and Junior Accessory Dwe…
    Overview
    1. Sec. 49.01. - General requirements.
    2. Sec. 49.02. - Reserved.
    3. Sec. 49.03. - Permit requirements.
    4. Sec. 49.04. - Accessory dwelling units—Application and process…
    5. Sec. 49.05. - Utility connections and fees.
    6. Sec. 49.06. - Accessory development standards.
    7. Sec. 49.07. - Maximum floor area.
    8. Sec. 49.08. - Height limit.
    9. Sec. 49.09. - Lot coverage.
    10. Sec. 49.10. - Architectural objective.
    11. Sec. 49.12. - Parking.
    12. Sec. 49.13 - Standards for proposed accessory structures attac…
    13. Sec. 49.14. - General requirements.
    14. Sec. 49.15. - Reserved
    15. Sec. 49.16. - Permit requirements.
    16. Sec. 49.17. - Application and processing requirements.
    17. Sec. 49.18. - Utility connection fees.
    18. Sec. 49.19. - Development standards.
    19. Sec. 49.20. - Deed restrictions.

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