Colusa — Variances and Exceptions

Last reviewed: July 1, 2026

Overview

This page explains how the City of Colusa’s zoning code handles variances and exceptions (relief from numeric zoning rules) and the special, stricter rules that apply when floodplain standards are involved. The controlling rules for general variances are in § 34.01; floodplain-specific variance and appeal rules are in § 39.06.

Where this page mentions related topics the first time, it links to the City’s local guidance: the City zoning map and program, development standards, parking, design review, overlays, ADU rules and the state building code. See the linked topics for permit-level requirements: Colusa Zoning, Colusa Development Standards, Colusa Parking, Colusa Design Review, Colusa Overlay Districts, Colusa ADUs and California Building Standards Code.

What the code actually requires (quick map)

• General variances from area/height/yard/space rules are processed by the planning commission under § 34.01; applicants must show special circumstances, that denial causes exceptional hardship, and that granting will not give special privileges or injure public welfare.

• Notices, hearing timing, appeal and revocation rules for variances are set out in § 34.01 (public hearing within 60 days, 300-foot notice mailing, planning commission findings, appeals to city council, and a one‑year expiry if not used).

• Floodplain variances follow a separate, stricter set of standards in § 39.06 (variance only in narrowly defined circumstances, minimum necessary relief, special notice/recording, and a warning that flood insurance rates may rise). Variances that increase flood heights or are within mapped regulatory floodways are prohibited.

• The code defines many districts by name; when considering a variance you must check the district standards for that parcel (for example R‑1, R‑3, C‑N, M‑2, P‑F, O‑S, F‑W). The list of district symbols and combining districts is in § 2.01.

District-by-district (how variances are viewed in specific Colusa districts)

Note: the variance process and findings are uniform citywide (see § 34.01) but the practical issues differ by district because of permitted uses, setbacks, and density. Below are the districts for which the Colusa code gives substantive standards in the retrieved materials; each subsection lists purpose, typical permitted uses, key dimensional standards (when available from the code), and where it applies.

R-1 (Single-Family Residence)

• Purpose: Apply to single‑family residential areas and newly annexed lands default to R‑1 if not otherwise mapped. § 5.01 defines intent and application.
• Typical permitted uses: one‑family dwellings, accessory buildings, small residential care, parks and schools, secondary dwelling units (ADUs) (subject to ADU standards). § 5.02. (See ADU rules at Colusa ADUs.)
• Key dimensional standards (apply unless modified by a variance): Lot area 8,000 sq ft, front setback 20 ft, max coverage 35%, interior side yards not less than 5 ft on one side (total not to exceed 15 ft), rear yard = 20% of lot depth (min 15 ft, max 30 ft). § 5.05.
• Where it applies: City residential neighborhoods and default district for unmapped lands. § 3.02(a).

R-3 (Neighborhood Apartment)

• Purpose: For small multi‑unit residential areas. § (R‑3 provisions).
• Typical uses: Multifamily dwellings, accessory uses listed for R‑1 expanded to higher density. § 7. (R‑3 rules)*.
• Key dimensional standards: Lot area 6,000 sq ft, lot dimensions 60 x 100 ft, max coverage 60%, front setback 20 ft (can be 10 ft under HD combining district), interior side yard 5 ft on one side and 10% of lot width on the other, rear yard 20% (min 15 ft). § 7. (minimums)*.

R-4 (General Apartment)

• Purpose: Areas where multifamily dwellings are the principal use. § 8.01.
• Typical uses: R‑3 uses plus larger multifamily projects, single room occupancy, farmworker housing. § 8.02.
• Key dimensional standards: Lot area generally 6,000 sq ft or as R‑3; 1,500 sq ft per unit for structures with 5+ units; front setback 20 ft (10 ft with HD); height limit 4 stories / 50 ft. § 8.05.

C‑N (Neighborhood Business)

• Purpose: Neighborhood commercial to serve nearby residences. § 9.01.
• Typical uses: Retail shops (food, drugstores), barber/beauty, professional offices, restaurants, service stations (with enclosed operations), and most R‑district uses subject to restrictions. § 9.02.
• Key dimensional standards: Follow Article 32 general rules and standards for the underlying district; dwellings permitted only with a major use permit. § 9.02(a–b).

M‑2 (General Industrial)

• Purpose: Heavy industrial uses where more intensive operations are permitted. § 13.01.
• Typical uses: Wholesale lumberyards, concrete batch plants, heavy manufacturing, enclosed heavy operations (some uses require walls/fences). § 13.02.
• Key dimensional standards: Many minimums waived (lot area, width, coverage, front yard often none), rear yard 5 ft, height limits can be high (up to 100 ft for some industrial). § 13.04.

P‑F (Public Facilities)

• Purpose: Sites for public facilities, utilities, schools, parks and similar uses. § 16.01–16.02.
• Typical uses: Public schools, parks, civic centers, public utility facilities; similar uses by planning commission written findings. § 16.02(a).
• Key dimensional notes: Use- and site-specific standards, with some variation allowed by the planning commission; variations to fit topography/design are expressly allowed in related sections § 15.07–15.08.

O‑S (Open Space)

• Purpose: Preserve natural terrain, provide buffers, recreational and conservation uses. § 17.01–17.02.
• Typical uses: Trails, parks, low‑intensity recreation, crop/tree farming, grazing, and similar uses with planning commission findings. § 17.02(a).

F‑W (Floodway District) and Floodplain Combining Districts

• Purpose: Regulate development in areas of special flood hazard; floodway areas are treated as hazardous and subject to strict prohibitions on encroachments. § 39.03–39.05 and floodway rules.
• Typical uses: Limited; encroachments are generally prohibited unless certified by a registered engineer that flood elevations will not increase. § 39.05(f).
• How variances behave here: Floodplain variances are rare and subject to extra findings (see § 39.06).

(Full district list with combining districts appears in § 2.01. Use that to confirm your parcel’s base zone before applying for a variance.)

Most decision‑relevant standards (table)

Checklist — what an applicant must prepare (from the code)

• Completed variance application form and filing fee as set by city resolution. § 34.01(a)
• Scaled site plans, elevations and statements showing the special circumstances of the property (size, shape, topography, location or surroundings). § 34.01(a)(1)(a)
• Written justification that denial causes exceptional hardship (note: mere economic hardship alone is generally insufficient). § 34.01(a)(1)(b) and definitions on "Hardship".
• Proof of notice materials for neighbors (addresses from assessor’s roll for 300‑ft radius). § 34.01(a)(2)
• If in a mapped flood hazard area, technical flood evaluations and evidence showing variance meets minimum necessary floodplain criteria and will not increase base flood elevations; be prepared for a recorded notice about insurance consequences. § 39.06(c) and § 39.06(b)(4).
• Any additional materials required by applicable overlay or combining district (e.g., HD, FP) — check Colusa Overlay Districts and the parcel’s zone.

Risks & Ambiguities

Plain‑English summary

If your Colusa property can’t meet a numeric zoning rule because of a unique, physical lot problem (not just money), you can apply for a variance to the Planning Commission; you must show the hardship is exceptional, the variance is the minimum needed, and it won’t give you a special privilege or harm neighbors. Floodplain variances are subject to much stricter rules and are rarely granted. § 34.01 and § 39.06 explain the standards and procedures.

Information Gaps / What the code excerpts do not confirm

• Exact current fees for filing a variance are set by council resolution; the ordinance references a fee schedule but the numerical fee is not in the retrieved text. Verify with the planning department. Not found in retrieved materials.
• Specific procedural checklists, pre-application meeting requirements, and application forms are not in the code excerpts; these are administered by the planning department. Not found in retrieved materials.
• Any local administrative adjustment or "minor variance" program (administrative adjustments by director vs. planning commission) — the code shows minor use permits but does not contain an explicit administrative variance procedure in the retrieved sections. Verify with the planning department. Not found in retrieved materials.

Source References

• Colusa Zoning Code — Title 17 Zoning, Article 34 (Variances), § 34.01.
• Colusa Zoning Code — Floodplain regulations, Article 39, Variances and appeals, § 39.06.
• Colusa Zoning Code — R‑1 Single Family Residence District regulations, § 5.01–5.05.
• Colusa Zoning Code — R‑3/R‑4 multifamily and dimensional standards, Article 7–8 (lot dimensions, setbacks, height).
• Colusa Zoning Code — C‑N Neighborhood Business District uses, § 9.01–9.02.
• Colusa Zoning Code — M‑2 General Industrial District, Article 13 (uses and setbacks).
• Colusa Zoning Code — District list and combining districts, § 2.01–2.02.
• Colusa Zoning Code — Off‑street parking (Article 29) (for related parking obligations). § 29.01.

Retrieved passages

• Colusa Zoning Code (section 39.02) High relevance show source text
• Colusa Zoning Code (section 39.02) High relevance show source text
• Colusa Zoning Code (Section 34.01) High relevance show source text
• California Building Code (Article 35.) High relevance show source text
• Colusa Zoning Code (section 39.05) High relevance show source text
• Colusa Zoning Code High relevance show source text
• Colusa Zoning Code (article may) High relevance show source text
• Colusa Zoning Code (section shall) High relevance show source text
• Colusa Zoning Code (§ 2) High relevance show source text
• Colusa Zoning Code (chapter creates) Medium relevance show source text
• Colusa Zoning Code (Article 29.) Medium relevance show source text
• Colusa Zoning Code (Article 32) Medium relevance show source text
• Colusa Zoning Code Medium relevance show source text
• Colusa Zoning Code (Article 29) Medium relevance show source text
• Colusa Zoning Code (Title 17) Medium relevance show source text

Cited sections

• Colusa Zoning Code — Title 17 Zoning, Article 34 (Variances), **§ 34.01**. (Title 17)
• Colusa Zoning Code — Floodplain regulations, Article 39, Variances and appeals, **§ 39.06**. (Article 39)
• Colusa Zoning Code — R‑1 Single Family Residence District regulations, **§ 5.01–5.05**. (§ 5.01)
• Colusa Zoning Code — R‑3/R‑4 multifamily and dimensional standards, **Article 7–8** (lot dimensions, setbacks, height). (Article 7)
• Colusa Zoning Code — C‑N Neighborhood Business District uses, **§ 9.01–9.02**. (§ 9.01)
• Colusa Zoning Code — M‑2 General Industrial District, **Article 13** (uses and setbacks). (Article 13)
• Colusa Zoning Code — District list and combining districts, **§ 2.01–2.02**. (§ 2.01)
• Colusa Zoning Code — Off‑street parking (Article 29) (for related parking obligations). **§ 29.01**. (Article 29)
• Colusa_ZoningCode.md

• Official Colusa code library