Local zoning · Contra Costa County

Contra Costa County — Variances and Exceptions

Variances and Exceptions under the Contra Costa County local zoning and planning code, with the controlling citations.

Last reviewed: July 6, 2026

Overview

In unincorporated areas of Contra Costa County, “variances” and “exceptions” are narrow tools that allow relief from certain zoning and planning standards only when strict findings are met. The County’s rules are highly context-specific: flood hazard regulations, airport airspace zones, planned unit districts, intersection sight-triangle standards, and even parking each have their own variance or exception pathways embedded in the ordinance. This page synthesizes where variances and exceptions exist in the County code, who decides them, and the core findings you must meet.

Bottom line: Contra Costa County variances are granted only when you prove a specific, code-defined hardship and when the relief is the minimum necessary and consistent with public safety and the ordinance’s purpose (see especially flood, airport, and P‑1 planned unit provisions).

Where variances and exceptions appear in the Contra Costa County ordinance

Flood hazard regulations: Variance procedure and findings in Articles 82-28.6 and 82-28.12, including a definition of “variance,” freeboard basis, decision-maker, and appeal path. See § 82-28.516, § 82-28.604, § 82-28.1201, § 82-28.1202, § 82-28.1204.
Airport zoning (Buchanan Field): Variances to height/use limits in approach/turning/transition zones via the Board of Adjustment, with hardship and public interest tests; hazard-lighting conditions may be required. See § 86-4.020 and § 86-4.022.
Planned Unit District (P‑1): Variance permits may modify Article 84-66.6 standards if consistent with the General Plan; processed per Chapters 26-2 and 82-6. See § 84-66.2002.
Parking standards: Chapter 82‑16 allows variances per Article 26‑2.20 for any parking requirement. See § 82-16.416.
Sight obstructions at intersections: A Board of Adjustment variance can be sought from the sight‑triangle limits. See § 82-18.010.
Subdivision-related dimensional relief: If a “modification or variance” of lot area/yard/height/setback is necessary for a tentative map, it is processed as an “exception” under Title 9, with Land Use Permit-style notice; administered by the Planning Commission. See § 82-6.002 and § 82-6.006.

Decision snapshot (common variance/exception tracks)

Context	Decision-maker	Core findings/limits	Code Reference
Special Flood Hazard Areas	Zoning Administrator (appeal to Planning Commission/Board of Supervisors)	Show “good and sufficient cause,” “exceptional hardship;” relief is the minimum necessary; no increased flood heights or added public risk; floodway increases prohibited.	§ 82-28.1202, § 82-28.1204
Airport Zoning (Buchanan Field)	Board of Adjustment	Practical difficulty/unnecessary hardship; not contrary to public interest; consistent with chapter purpose; hazard lighting/markers may be conditioned.	§ 86-4.020, § 86-4.022
P‑1 Planned Unit District	Per Chapters 26‑2 and 82‑6	May modify Article 84‑66.6 standards; must be consistent with General Plan.	§ 84-66.2002
Parking chapter	Per Article 26‑2.20	Variances available for parking requirements; process findings not shown in retrieved materials.	§ 82-16.416 (Article 26‑2.20 details: Not found in retrieved materials)
Sight-Triangle at Intersections	Board of Adjustment	May grant, grant conditionally, or refuse to grant a variance to sight limits.	§ 82-18.010
Tentative Map “Exceptions” (Subdivision Title 9)	Planning Commission	Dimensional relief treated as an exception under Title 9; hearing notice like Land Use Permits.	§ 82-6.002, § 82-6.006

District-by-district and zone-by-zone detail (variance-relevant)

Special Flood Hazard Areas (Articles 82-28.6 & 82-28.12)

Purpose and where it applies: Applies to FEMA-mapped areas of special flood hazard; the County adopts the Flood Insurance Study for unincorporated areas and requires freeboard (2 ft in the SF Bay–Delta region; 1 ft elsewhere). See § 82-28.604.
Typical permitted uses: Underlying zoning uses remain, but development must meet flood standards. Variance is relief from flood requirements only; it does not authorize otherwise prohibited uses. See § 82-28.516 (definition).
Key standards: Variances are “property-based,” rare, and must be the minimum necessary to afford relief; cannot increase base-flood levels or create added risks; floodway relief is prohibited if it increases flood levels. See § 82-28.1201 and § 82-28.1204.
Decision/appeal: The Zoning Administrator decides variances and related appeals; further appeals follow Article 26‑2.24 to the Planning Commission and Board of Supervisors. See § 82-28.1202.

Airport Approach Zones (Buchanan Field) (Chapter 86-4)

Purpose and where it applies: Land within about two miles of Buchanan Field is segmented into approach, turning, and transition zones to protect air navigation. See § 86-4.012.
Typical permitted uses: Underlying land use continues, but with added airspace limits and use restrictions (e.g., no glare, radio interference, smoke, etc.). See § 86-4.016.
Key dimensional standards: Approach zones have graduated height limits starting at 20 ft and increasing by stepped increments up to 150 ft, depending on runway distance segment and zone number. See § 86-4.014.
Variance track: Apply to the Board of Adjustment; must show practical difficulty/unnecessary hardship; relief not contrary to public interest; hazard lighting/markers may be required. See § 86-4.020, § 86-4.022.

Airport Turning Zones (Buchanan Field)

Purpose/use: Same as above; protects maneuvering areas. See § 86-4.012 and use restrictions in § 86-4.016.
Dimensional standards: Maximum height generally 150 ft (except mapped “not included” areas). See § 86-4.014(3).
Variance: Same Board of Adjustment hardship/public interest test; possible lighting conditions. See § 86-4.020, § 86-4.022.

Airport Transition Zones (Buchanan Field)

Purpose/use: Transitional protection between approach/turning and the surrounding area; underlying uses remain subject to restrictions. See § 86-4.012, § 86-4.016.
Dimensional standards: Maximum heights as shown on the adopted airport zoning plan. See § 86-4.014(4).
Variance: Board of Adjustment with the same criteria/conditions. See § 86-4.020, § 86-4.022.

P‑1 Planned Unit District (Article 84‑66)

Purpose and where it applies: The P‑1 district is a planned development tool; uses and standards are defined by approved development plans and Article 84‑66.6 standards. See general P‑1 framework in Article 84‑66.
Typical permitted uses: As established by the approved development plan for the P‑1 area; design review and development standards may also apply.
Key dimensional standards: Governed by Article 84‑66.6 (not reproduced in retrieved excerpts).
Variance track: A “variance permit” may modify Article 84‑66.6 provisions if the hearing body finds General Plan consistency; processed per Chapters 26‑2 and 82‑6. See § 84-66.2002.

Countywide Sight‑Triangle Areas (Chapter 82‑18)

Purpose and where it applies: Protects vehicle visibility near intersections and railroad crossings; caps height of structures/vegetation within a sight triangle. See § 82-18.002, § 82-18.006.
Typical permitted uses: Underlying uses continue; this is a visibility constraint.
Key dimensional standards: Max 2.5 ft above curb grade (3 ft at edge of pavement) within a defined triangle. See § 82-18.002.
Variance track: Appeal or variance to the Board of Adjustment per § 82-18.010.

Parking Requirements (Chapter 82‑16)

Purpose/where it applies: Countywide off‑street parking standards; shared parking and other tools are in Chapter 82‑16. See general framework in Chapter 82‑16 (shared parking deed restrictions at § 82‑16.414 illustrate administration).
Variance track: A variance from any parking requirement may be obtained per Article 26‑2.20. See § 82-16.416. (Details of Article 26‑2.20: Not found in retrieved materials.)

Subdivision “Exceptions” for Dimensional Relief (Chapter 82‑6 cross‑reference)

Purpose/where it applies: When a tentative map needs relief from lot area, side yard, height, or setback, it is processed as an “exception” under Title 9 (Subdivision), with hearing notice like a Land Use Permit. See § 82-6.002.
Administration: The Planning Commission administers such modification/variance necessary to a tentative map. See § 82-6.006.

Key flood variance standards (most common hardship track)

“Variance” is defined in the flood chapter as relief from its requirements. See § 82-28.516.
Findings: Must show “good and sufficient cause,” that denial would cause “exceptional hardship,” and that granting will not raise flood heights, add threats to safety, create extraordinary public expense, or conflict with other laws; variance must be the minimum necessary. See § 82-28.1204.
Decision/appeals: Zoning Administrator decides; appeals go per Article 26‑2.24 to the Planning Commission and Board of Supervisors. See § 82-28.1202.
Special notes: Variances in a designated floodway cannot be issued if any increase in flood levels would result; applicants granted a variance to build below base flood elevation must receive and record special flood‑risk and insurance cost notices. See § 82-28.1204.

Checklist

Confirm your parcel is in unincorporated Contra Costa County and identify all applicable contexts: flood hazard, airport zones, P‑1 district, intersection sight triangle, or parking standards.
Match your request to the correct variance/exception pathway and decision-maker (e.g., Zoning Administrator for flood; Board of Adjustment for airport/sight‑triangle; P‑1 variance permits per § 84-66.2002).
Prepare required findings and evidence:
- Flood: exceptional hardship, minimum necessary relief, no increase to base flood, etc. (§ 82-28.1204).
- Airport: practical difficulty/unnecessary hardship; not contrary to public interest; accept possible lighting conditions (§ 86-4.020, § 86-4.022).
- P‑1: demonstrate General Plan consistency for any variance to Article 84‑66.6 (§ 84-66.2002).
Provide technical documentation where relevant (e.g., flood elevations, site sections, height exhibits within airport zones).
Understand appeals and recordation requirements (e.g., flood variance notices must be recorded in the chain of title; § 82-28.1204(6)).
Coordinate with Overlay Districts, Design Review, and Development Standards early; variances do not waive separate approvals.

Risks & Ambiguities

Issue	Why it matters	What to verify
General variance process under Article 26‑2.20	Parking and P‑1 reference Article 26‑2; detailed findings/procedures aren’t in retrieved excerpts.	Process steps, noticing, and findings in Article 26‑2. “Not found in retrieved materials.”
Base-district setback/height variances	Standard zoning districts (e.g., R‑6, A‑2) may have general variance pathways not shown here.	Whether a general variance chapter applies beyond flood/airport/P‑1. “Not found in retrieved materials.”
Airport zoning map boundaries	Exact zone lines control max height and permitted relief.	The adopted Buchanan Field map referenced in § 86-4.012 at County Planning.
Floodway vs. floodplain	Variances in a “floodway” are far more limited.	Whether your site is within a designated floodway; see § 82-28.1204.
Subdivision “exceptions” interplay	Tentative map “exceptions” are not the same as zoning variances.	Title 9 procedures referenced by § 82-6.002/§ 82-6.006.
Nonconforming situations	Variances do not automatically cure nonconformities.	See Nonconforming Uses and any chapter-specific provisions before filing.

Plain-English Summary

If you’re in the unincorporated areas, Contra Costa County allows variances only in narrow situations and only with strict evidence. Flood-area variances go to the Zoning Administrator and require proof of exceptional hardship and minimum necessary relief; airport‑zone variances go to the Board of Adjustment and require a hardship showing and may require hazard lighting; P‑1 planned unit areas have their own variance permit that must align with the General Plan. Parking and intersection sight‑triangle standards also have their own variance or exception routes. Start by confirming which specific chapter applies, then build a case that meets the chapter’s exact findings.

Source References

Flood hazard variance definition and scope: § 82-28.516; flood study basis and freeboard: § 82-28.604; nature of variances: § 82-28.1201; decision-maker/appeals and evaluation factors: § 82-28.1202; conditions/findings/limits/recordation: § 82-28.1204.
Airport zoning map, height and use restrictions, variances and hazard marking: § 86-4.012, § 86-4.014, § 86-4.016, § 86-4.020, § 86-4.022.
P‑1 Planned Unit District variance permits: § 84-66.2002.
Parking chapter variance cross-reference: § 82-16.416.
Intersection sight‑triangle variance/appeal: § 82-18.010.
Land Use Permits admin; subdivision “exceptions” for tentative maps: § 82-6.002, § 82-6.006.
For context and related processes: Contra Costa County zoning & planning overview, Contra Costa County Zoning, Contra Costa County Land Use, Contra Costa County Development Standards, Contra Costa County Design Review, Contra Costa County Overlay Districts, Contra Costa County Parking, Contra Costa County Nonconforming Uses
Note: This page does not cover the California Building Standards Code.

Information Gaps

Article 26‑2.20 variance procedures/findings (referenced in parking and P‑1 processing) — Not found in retrieved materials.
General variance provisions applicable to base zoning districts outside of flood/airport/P‑1 — Not found in retrieved materials.
Specific P‑1 Article 84‑66.6 dimensional standards and any district‑specific variance criteria beyond § 84‑66.2002 — Not found in retrieved materials.
Full Title 9 (Subdivision) “exception” procedures — Not found in retrieved materials.

Sources

Retrieved passages

Contra Costa County Zoning Code (Section 82-28.1202) High relevance
Contra Costa County Zoning Code (Section 82-28.1202) High relevance
Contra Costa County Zoning Code (Section 8228.1204) High relevance
Contra Costa County Zoning Code (Section 8228.1012) High relevance
Contra Costa County Zoning Code (chapter may) High relevance
Contra Costa County Zoning Code (Article 26-2.24) High relevance
Contra Costa County Zoning Code (§ 8112) High relevance
Contra Costa County Zoning Code (Chapter 84.30) Medium relevance

Cited sections

Official Contra Costa County code library

Frequently asked questions

What variance findings are required in a flood hazard area?

You must show good and sufficient cause, that denial would cause exceptional hardship, and that the variance is the minimum necessary. The County also cannot grant a variance that raises flood heights, adds public risk, or conflicts with laws; floodway increases are prohibited. See § 82-28.1204.

Who decides airport height variances near Buchanan Field?

Airport‑zone variances are decided by the Board of Adjustment. You must demonstrate practical difficulty or unnecessary hardship, and the relief cannot be contrary to the public interest; the County may require hazard markers or lighting as conditions. See § 86-4.020 and § 86-4.022.

Can I get a variance from parking requirements?

Yes. Chapter 82‑16 allows variances from any parking requirement, processed pursuant to Article 26‑2.20. The detailed procedures and findings for Article 26‑2.20 were not included in the retrieved materials; verify with the jurisdiction. See § 82-16.416.

Do P‑1 Planned Unit Districts have their own variance process?

Yes. A P‑1 “variance permit” can modify Article 84‑66.6 standards if the hearing body finds the change consistent with the General Plan; procedures follow Chapters 26‑2 and 82‑6. See § 84-66.2002.

How do appeals work for flood-related variances?

The Zoning Administrator decides flood variances; appeals proceed under Article 26‑2.24 to the Planning Commission and then the Board of Supervisors, with records maintained and notices as required. See § 82-28.1202.

Is there a way to vary the intersection sight‑triangle standard?

Yes. You may appeal the Public Works determination or seek a variance to the sight‑triangle limits by application to the Board of Adjustment, which may grant, conditionally grant, or deny the variance. See § 82-18.010.

What if my tentative map needs relief from setbacks or height?

If a “modification or variance” of lot area, yards, height, or setback is necessary for a tentative map, it is processed as an “exception” under Title 9, with Land Use Permit‑style noticing; the Planning Commission administers these. See § 82-6.002 and § 82-6.006.

Does a variance fix a nonconforming situation?

No. A variance in one chapter doesn’t automatically legalize nonconforming uses or structures under others. Review the Nonconforming Uses rules and any chapter-specific limits before applying.

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