Contra Costa County — Variances and Exceptions

Overview

In unincorporated areas of Contra Costa County, a variance or exception is the County’s limited tool to relax a zoning, overlay, or development standard when strict application would create a unique hardship and relief would stay consistent with the ordinance’s purpose. General zoning variances are discretionary and may carry conditions, while special overlays (especially floodplain regulations) apply stricter, property‑focused findings. Some chapters also allow targeted exceptions or waiver/adjustment processes tied to constitutional “takings.”

Variances run with the land, not the owner, and exist to address unusual physical characteristics of a parcel—especially in flood hazard contexts—not personal circumstances (§ 82-28.1201).

What can be varied—and by whom

• General variance authority (unincorporated areas):
  • Any person may seek a variance “to erect any structure, increase height, permit growth of any tree, or otherwise use the property” contrary to a standard in the zoning chapter, when literal enforcement causes practical difficulty or unnecessary hardship; relief must not be contrary to the public interest, must do substantial justice, and align with the spirit of the regulations (§ 86-4.020). The County may impose conditions (§ 86-4.020).
• Subdivision context variances:
  • When a tentative subdivision map is under consideration, the Planning Commission administers any necessary modification or variance in lot area, side yard, height, or setback (§ 82-6.006).
• Floodplain management variances (strict):
  • Nature: Variances pertain to the property, requiring “exceptional hardship” due to unique land characteristics, not shared by adjacent parcels (§ 82-28.1201). Personal or economic reasons do not qualify (§ 82-28.468).
  • Conditions: No variance may increase flood levels in a designated floodway; variances must be the minimum necessary; require “good and sufficient cause” and a showing that denial would cause exceptional hardship; and must not create increased flood heights, safety threats, extraordinary public expense, nuisances, fraud/victimization of the public, or conflicts with local law (§ 82-28.1204(2)–(4)).
  • Historic structures: May be varied if work preserves historic designation and is the minimum necessary to preserve character (§ 82-28.1204(1)).
  • Functionally dependent uses: May receive variances if minimum criteria are met and the development is protected to minimize flood damage without creating new public safety threats (§ 82-28.1204(5)).
  • Mandatory notice and recordation: If a variance allows building below base flood level, the Floodplain Administrator must provide written notice of substantially higher flood insurance rates (as high as $25 per $100 of coverage) and record the notice in the chain of title (§ 82-28.1204(6)).
• Sight triangles/intersection visibility:
  • Variances from intersection sight obstruction standards may be obtained per the County’s variance procedures in Article 26-2.20 (referenced), as cross‑applied by the sight obstruction chapter (§ 82-16.416). Coordinate with Land Use, Development Standards and Parking requirements where relevant.
• Hillside/ridgeline provisions (Article 814-2):
  • Variance permits may modify provisions in Articles 814-2.6 through 814-2.14, processed under Chapters 26-2 and 82-6 (§ 814-2.1602).
  • One-house exception: A legal vacant parcel with average slope not exceeding thirty percent, and with no significant ridgelines or hilltops, may have one detached single‑family dwelling without the article’s application submittal and development plan review/approval (§ 814-2.1408). Coordinate with Design Review as applicable elsewhere.
  • Improvement exceptions: Exceptions to Titles 7 and 9 improvements may be allowed to meet Article 814-2 standards and findings (§ 814-2.818).
• Accessory buildings in the R-6 district:
  • Variance permits may modify accessory building area coverage and height limits in § 82-4.212(1)–(2), processed under Chapters 26-2 and 82-6 (§ 84-2.006).
• Inclusionary/fee “takings” waivers or adjustments (residential development):
  • If an applicant demonstrates no reasonable nexus between a residential project’s impacts and an inclusionary requirement or fee—amounting to a taking—the County may adjust or waive the requirement (§ 822-4.422).
  • Filing deadlines: A written request with economic evidence is due no later than 15 days before the first public hearing on any discretionary approval; if no discretionary approval or if the action occurs after that hearing, file within 10 days of the challenged action (§ 822-4.422).
  • Decision‑maker: Board of Supervisors (§ 822-4.422).
• Conflict clause (water systems, construction chapter):
  • If Chapter 82-30 conflicts with Chapter 414-4, the latter prevails (§ 82-30.204). This does not itself grant a variance but clarifies which standard controls.

For broader context on zoning districts and overlays in the unincorporated areas, see Contra Costa County Zoning, Overlay Districts, and Contra Costa County Development Standards. For historic resources, coordinate with Historic Preservation. Variances do not substitute for compliance with the California Building Standards Code.

District-by-district and chapter-specific notes (variance/exception focus)

Chapter 84-4 — R-6 Single-Family Residential District

• Purpose and typical uses: Not found in source materials.
• Key dimensional standards: Area coverage and height for accessory buildings are controlled by § 82-4.212(1)–(2) (specific figures not in source materials).
• Variance pathway: Accessory building area coverage/height may be varied via Chapters 26-2 and 82-6 (§ 84-2.006).
• Where it applies: Unincorporated areas mapped R‑6 (Verify with the jurisdiction). Cross‑check with Development Standards.

Article 814-2 — Slope/Ridgeline/Hilltop Standards (inferred from text)

• Purpose and typical uses: Regulates development on sloped terrain, ridgelines, and hilltops (inferred from §§ 814-2.1408, 814-2.1602).
• Key dimensional/approval standards: Not found in source materials (Article 814-2.6–814-2.14 are referenced but not provided).
• Exception: A single detached dwelling may be placed on a legal vacant lot with average slope ≤ 30% and without significant ridgelines/hilltops, exempt from application submittal and development plan review under this article (§ 814-2.1408).
• Variance pathway: Variances may modify Articles 814-2.6–814-2.14 through Chapters 26-2 and 82-6 (§ 814-2.1602). Improvements exceptions to Titles 7 and 9 may be allowed to meet this chapter’s objectives (§ 814-2.818).
• Where it applies: Unincorporated areas subject to Article 814-2 (Verify with the jurisdiction). See Overlay Districts.

Article 82-28 — Floodplain Management Areas

• Purpose: Protect life/property from flooding; County policy is to strictly limit variances (§ 82-28.1201).
• Typical uses: Not found in source materials.
• Key standards affecting variances:
  • Variances are property‑based and rare; must be minimum necessary (§ 82-28.1201; § 82-28.1204(3)).
  • No floodway variances that increase flood levels (§ 82-28.1204(2)).
  • Findings: good cause; exceptional hardship; no increase in flood heights, safety hazards, public expense, nuisances, fraud/victimization, or legal conflicts (§ 82-28.1204(4)).
  • Flood hazard hardship is tightly defined; economic/personal reasons insufficient (§ 82-28.468).
  • Required recorded notice: Insurance premiums can be as high as $25 per $100 of coverage when built below base flood level (§ 82-28.1204(6)).
• Special cases: Historic structures and functionally dependent uses (§ 82-28.1204(1), (5)).
• Where it applies: Unincorporated areas within mapped flood hazard areas (Verify with the jurisdiction).

Intersection Visibility — Sight Obstructions

• Purpose: Maintain clear sight distance at intersections.
• Variance pathway: Variances are available under Article 26-2.20 (referenced), per § 82-16.416.
• Typical conditions: Not found in source materials. Coordinate with Landscaping and Screening and Parking when driveway/landscape features are involved.
• Where it applies: Unincorporated areas wherever intersection visibility standards apply (§ 82-16.416).

Division 822 — Residential Inclusionary/Impact Requirements (Takings)

• Purpose: Implement inclusionary or fee requirements for residential development; provides a constitutional “takings” safety valve.
• Exception/adjustment: Board of Supervisors may adjust/waive if no reasonable relationship (nexus) exists between project impacts and fee or inclusionary requirement (§ 822-4.422).
• Filing deadlines: 15 days before first discretionary hearing; if none or if action comes later, within 10 days of the challenged action (§ 822-4.422).
• Where it applies: Unincorporated areas for qualifying residential development (§ 822-4.422).

Variance and Exception Pathways (key decision points)

Checklist

• Confirm the parcel is in the unincorporated areas and identify all applicable chapters/overlays using Contra Costa County Zoning and Overlay Districts.
• Identify the exact standard you seek to vary (cite the controlling section).
• For a general zoning variance, prepare findings addressing practical difficulty/unnecessary hardship, public interest, substantial justice, and consistency with the ordinance’s spirit (§ 86-4.020).
• If in a flood hazard area, prepare property‑specific hardship evidence; demonstrate minimum necessary relief; and show no increase in flood levels (especially in floodways) and no added public risk/expense (§§ 82-28.1201, 82-28.1204(2)–(4), 82-28.468).
• If proposing work on a historic structure in a flood area, document that the work preserves its historic designation and is the minimum necessary (§ 82-28.1204(1)); coordinate with Historic Preservation.
• For intersection visibility issues, route the request under Article 26-2.20 procedures as referenced in § 82-16.416 (Verify with the jurisdiction).
• In hillside contexts (Article 814-2), determine if the single‑house exception applies (legal lot, ≤30% average slope, no significant ridgelines/hilltops) (§ 814-2.1408). If not, assess a variance under § 814-2.1602 or possible improvements exceptions under § 814-2.818.
• In R‑6, if varying accessory coverage/height, tie the request to § 84-2.006 and the underlying § 82-4.212(1)–(2) standards.
• For subdivision tentative maps, coordinate any lot area/yard/height/setback variances with the Planning Commission’s map hearing (§ 82-6.006).
• If asserting a constitutional “takings” waiver/adjustment for residential inclusionary/fees, file a written, evidence‑backed request on time: at least 15 days before the first discretionary hearing, or within 10 days after the challenged action (§ 822-4.422).
• Anticipate and accept reasonable conditions of approval if relief is granted (§ 86-4.020).

Risks & Ambiguities

Plain-English Summary

If you’re in the unincorporated areas and a strict rule makes your site unworkable, you can ask the County for a variance. The County looks for a true, property‑based hardship, not just added cost. Floodplain variances are the tightest—no raising flood levels in a floodway and the variance must be the bare minimum. Some chapters offer targeted relief, like a one‑house hillside exception or R‑6 accessory building variances, and a separate waiver process exists if an inclusionary requirement would be an unconstitutional taking.

Source References

• § 86-4.020 — Variances (general criteria; Board of Adjustment; conditional approvals)
• § 82-6.006 — Modification or variance administration with tentative subdivision maps
• § 82-16.416 — Variances for sight obstructions by reference to Article 26-2.20
• §§ 82-28.1201, 82-28.1204, 82-28.468, 82-28.470 — Floodplain variance nature, conditions, hardship definition, related definitions
• § 814-2.1408 — Exception for one detached single-family dwelling on certain sloped legal lots
• § 814-2.1602 — Granting of variance permits within Articles 814-2.6 through 814-2.14
• § 814-2.818 — Improvement exceptions to Titles 7 and 9 to meet Article 814-2 objectives
• § 84-2.006 — Accessory building variances in the R‑6 District (modifying § 82-4.212(1)–(2))
• § 82-30.204 — Construction; conflict with Chapter 414-4
• § 822-4.422 — Takings determination; adjustment/waiver process and deadlines (Board of Supervisors)

Source passages

• Contra Costa County Zoning Code (§ 86-4.020) Medium relevance show source text
• Contra Costa County Zoning Code (§ 82-16.416) Medium relevance show source text
• Contra Costa County Zoning Code (§ 814-2.818) Medium relevance show source text
• Contra Costa County Zoning Code (§ 82-28.1201) Medium relevance show source text
• Contra Costa County Zoning Code (§ 82-30.204) Medium relevance show source text
• Contra Costa County Zoning Code (§ 822-4.422) Medium relevance show source text
• Contra Costa County Zoning Code (§ 814-2.1602) Medium relevance show source text
• Contra Costa County Zoning Code (§ 82-6.006) Medium relevance show source text
• Contra Costa County Zoning Code (§ 814-2.1408) Medium relevance show source text
• Contra Costa County Zoning Code (§ 84-2.006) Medium relevance show source text
• Contra Costa County Zoning Code (§ 82-28.1204) Medium relevance show source text
• Contra Costa County Zoning Code (§ 82-28.468) Medium relevance show source text

Cited sections

• § 86-4.020 — Variances (general criteria; Board of Adjustment; conditional approvals) (§ 86-4.020)
• § 82-6.006 — Modification or variance administration with tentative subdivision maps (§ 82-6.006)
• § 82-16.416 — Variances for sight obstructions by reference to Article 26-2.20 (§ 82-16.416)
• §§ 82-28.1201, 82-28.1204, 82-28.468, 82-28.470 — Floodplain variance nature, conditions, hardship definition, related definitions (§ 82-28.1201)
• § 814-2.1408 — Exception for one detached single-family dwelling on certain sloped legal lots (§ 814-2.1408)
• § 814-2.1602 — Granting of variance permits within Articles 814-2.6 through 814-2.14 (§ 814-2.1602)
• § 814-2.818 — Improvement exceptions to Titles 7 and 9 to meet Article 814-2 objectives (§ 814-2.818)
• § 84-2.006 — Accessory building variances in the R‑6 District (modifying § 82-4.212(1)–(2)) (§ 84-2.006)
• § 82-30.204 — Construction; conflict with Chapter 414-4 (§ 82-30.204)
• § 822-4.422 — Takings determination; adjustment/waiver process and deadlines (Board of Supervisors) (§ 822-4.422)

• Official Contra Costa County code library