Local zoning · Ventura County

Ventura County — Nonconforming Uses

Nonconforming Uses under the Ventura County local zoning and planning code, with the controlling citations.

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Last reviewed: July 6, 2026

Overview

This page explains how Ventura County’s Non-Coastal Zoning Ordinance applies to nonconforming uses, structures, and lots in the unincorporated areas. Ventura County’s zoning rules are codified as the “Non-Coastal Zoning Ordinance” and apply outside the Coastal Zone; they set the framework for what happens when a once-lawful use or structure no longer matches current zoning rules (for example, after an ordinance update).

Key rule in plain English: If a nonconforming use stops for 180 days or more, its legal nonconforming status is considered abandoned and terminated.

Link to big-picture context and related review steps: Ventura County zoning & planning overview, Ventura County Zoning, Ventura County Development Standards, Ventura County Parking, Ventura County Design Review, and Ventura County Overlay Districts.

What counts as “nonconforming”

  • Definitions:

    • A Nonconforming Use is a use that was legally established and maintained, but is no longer permitted in the zone or no longer meets current parking requirements for the zone.
    • A Nonconforming Structure is a lawfully erected or altered structure that no longer meets current development standards (height, setbacks, lot coverage, parking, etc.) due solely to later changes in law.

  • Ordinance scope:

    • Ventura County’s nonconforming rules apply throughout the unincorporated area (excluding the Coastal Zone) under the Non-Coastal Zoning Ordinance.

Core nonconforming rules that frequently decide outcomes

  • Uses nonconforming only because of updated parking standards:

    • Such uses may continue; expansion or change-of-use is allowed if current parking for the new/expanded use can be provided. The County can specify parking by permit where needed.
    • A limited exception allows expanding a single-family home that lacks full current parking if listed conditions are met (e.g., at least one covered space or very small homes ≤1,000 sq. ft.).
    • Discontinuance for 180+ days terminates nonconforming parking status.

  • Uses no longer permitted in their zone:

    • Nonconforming use of land without permanent structures must end within 3 years after it becomes nonconforming.
    • Nonconforming commercial or industrial uses located within Residential (R), Open Space (OS) or Agricultural (AE/RA, etc.) zones are subject to an amortization schedule tied to building square footage (max 60 years), after which they must conform or terminate unless a continuance is granted. Expansion/change of such uses is prohibited.
    • For non-amortized uses, a change may be allowed to a similar use with the same or less parking requirement (but not to a use that would require a Conditional Use Permit). Abandonment after 180 days terminates the status.

  • Continuation or time extension of a nonconforming use/structure:

    • The Planning Commission may issue a Continuation Permit if special circumstances exist and the continuance is not detrimental to the public interest, health, safety, convenience, or welfare. Filing deadlines apply when a Notice of Termination is served.
    • Continuation and Expansion permit types are identified in the County’s entitlements article.

  • Limited expansion of certain nonconforming uses in the OS zone:

    • Where zoning changes on March 2, 2010 made a formerly permitted OS-zone use nonconforming, a one-time Expansion Permit can allow up to a 25% increase in building area/use area if not detrimental to the public interest, etc.

  • Damage, destruction, and rebuild thresholds:

    • If a non-amortized nonconforming structure (or structure containing a non-amortized nonconforming use) is damaged/destroyed up to and including 50% of floor or roof area, it may be restored to its prior state if a complete building permit application is submitted within 12 months and pursued diligently; special Thomas Fire deadlines applied. If damage exceeds 50% (voluntary cumulative removal counts), full conformance is required.
    • Similar 50% thresholds govern amortized uses/structures.

  • No “add-on” uses while a nonconforming use remains:

    • No additional principal or accessory use is permitted on a lot while a nonconforming use (other than the keeping of animals) exists, even if the additional use would otherwise conform.

  • Nonconforming lots:

    • A legal lot that is smaller than today’s minimums can still be used as permitted in its zone.

  • Involuntary nonconformance:

    • A lot is not “nonconforming” if its status is caused by a conveyance to a public entity via or under threat of eminent domain.

  • Animals:

    • Nonconformities involving the keeping of animals (other than roosters addressed elsewhere in the code) must be brought into conformance within 3 years, unless a Continuation Permit is granted.

  • Overlay and wildlife-crossing setbacks (northern unincorporated area):

    • Existing nonconforming structures partially or wholly within the 200-foot wildlife-crossing setback are governed by the nonconforming-structures article; expansions can be deemed in conformance if the expansion is entirely outside the 200-foot area or does not increase the footprint and does not increase certain listed nonconformities.
    • See also County overlays for habitat connectivity and wildlife corridors.

  • ADUs on properties with nonconforming conditions:

    • County ADU standards recognize “Existing” to include legal nonconforming conditions.
    • Under state ADU law, an agency generally cannot deny an ADU solely because of existing nonconforming zoning conditions unless there is a public health/safety threat tied to the ADU work; see California ADU law (state guidance).

Key decisions at a glance

Topic What the code says Practical takeaway Code Reference
Abandonment of use 180+ days discontinuance ends nonconforming status Keep operations continuous; gaps can permanently forfeit rights § 8113-3.3; § 8113-5.3.3
Nonconformity due to parking only Continuance and expansion/change allowed if current parking is provided Solve parking to keep or expand; County can set parking via permit § 8113-3; § 8113-3.1–3.2
Land-only nonconforming uses Must terminate within 3 years Temporary wind-down only; plan exit § 8113-5.1
Amortization (commercial/industrial in R/OS/Ag) Formula by building SF; max 60 years; no expansion/change Expect a scheduled sunset unless Continuation Permit is granted § 8113-5.2; § 8113-5.2.1; § 8113-5.4
Change to similar use (not amortized) Allowed if similar and same/less parking; no CUP uses Pivot to a like-for-like or lower-intensity use § 8113-5.3.2
OS zone expansion One-time expansion up to 25% if made nonconforming on 3/2/2010 Narrow expansion path exists in OS § 8113-5.5
Damage/destruction threshold ≤50% may rebuild to original if timely; >50% must conform Track cumulative voluntary removal; clock runs to apply § 8113-6.1.1; § 8113-6.1.2; § 8113-6.2.1–.2
No additional uses No new principal/accessory uses while nonconforming use exists Don’t try to “layer” a new business onto a nonconforming site § 8113-7
Legal small lots Legal substandard lots can be used per zone Development is possible if the lot is legal § 8113-8
Animals 3-year amortization unless continued by permit Animal-related nonconformities sunset on a timetable § 8113-4
Wildlife crossing setback Specific rules for nonconforming structures within 200 feet Expansion outside setback or footprint-neutral may be OK § 8106-6.5.5

District-by-district: how nonconforming rules most often surface

Use listings are set in matrices at § 8105-4 (OS/AE/R/Special Purpose zones) and § 8105-5 (Commercial/Industrial); development standards (setbacks, height, coverage, etc.) are in § 8106-1. Verify specifics against the matrices and standards before acting.

  • Note on zone abbreviations in the County matrices: OS-REC, OS, AE, RA, RE, RO, R1, R2, RPD, RHD, TP, TRU.

OS-REC (Open Space – Recreation)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Not found in retrieved materials. See matrices at § 8105-4.
  • Key dimensional standards: Not found in retrieved materials; see § 8106-1 for current tables.
  • Nonconformity highlight: Where a use became nonconforming due to March 2, 2010 changes, limited expansion may be available if it qualifies under OS expansion standards. Verify applicability.

OS (Open Space)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Agricultural/open-space oriented; categories in matrices include Agriculture and animal husbandry. Verify the specific line items in § 8105-4.
  • Key dimensional standards: See § 8106-1.1 (OS included). Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: One-time ≤25% expansion path for certain OS nonconforming uses (made nonconforming on 3/2/2010).

AE (Agricultural Exclusive)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Agricultural uses dominate; see § 8105-4.
  • Key dimensional standards: In § 8106-1.1 (zone list includes AE). Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: Commercial/industrial uses in AE are amortized if made nonconforming; additional AE-specific discretionary permit findings apply to new/modified discretionary permits.

RA (Rural Agricultural)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Agriculture/residential mix; check § 8105-4.
  • Key dimensional standards: In § 8106-1.1. Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: Amortization schedules apply to commercial/industrial uses in Residential/Open Space/Agricultural zones; side-yard addition relief may apply to certain nonconforming residences.

RE (Rural Estate)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Low-density residential and accessory/agricultural categories; confirm in § 8105-4.
  • Key dimensional standards: In § 8106-1.1. Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: Same framework as RA; see amortization and residential setback relief provisions.

RO (Residential Open)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Residential with limited accessory uses; see § 8105-4.
  • Key dimensional standards: In § 8106-1.1. Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: Commercial/industrial nonconforming uses in R zones are amortized; additions to nonconforming side setbacks may be allowed within § 8106-5.15 limits.

R1 (Single-Family Residential)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Single-family dwellings and accessories; check § 8105-4.
  • Key dimensional standards: In § 8106-1.1. Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: Parking-only nonconformities may expand if conditions met; small-home exception exists. Side-yard addition relief can apply.

R2 (Two-Family Residential)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Two-family dwellings; check § 8105-4.
  • Key dimensional standards: In § 8106-1.1. Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: Same as R1 for parking-only and side-yard additions.

RPD (Residential Planned Development)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Planned residential forms; confirm in § 8105-4.
  • Key dimensional standards: Often project/permit-specific; base standards referenced in § 8106-1.1. Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: Commercial/industrial nonconforming uses amortized; verify permit conditions for continuance.

RHD (Residential High Density)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Multi-unit residential; confirm in § 8105-4.
  • Key dimensional standards: Refer to § 8106-1.1. Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: As above for residential zones.

TP (Timber Production)

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Not found in retrieved materials. See § 8105-4.
  • Key dimensional standards: See § 8106-1.1. Not found in retrieved materials for specific numbers.
  • Nonconformity highlight: Amortization applies if a commercial/industrial use in this zone is made nonconforming.

TRU

  • Purpose: Not found in retrieved materials.
  • Typical permitted uses: Not found in retrieved materials. See § 8105-4.
  • Key dimensional standards: Not found in retrieved materials; see § 8106-1.1.
  • Nonconformity highlight: Apply general nonconforming framework above.

For projects on historic sites, separate tailored findings and possible permit deviations can apply; see Ventura County Historic Preservation.

Checklist

  • Identify whether the issue is a use, structure, or lot nonconformity (and whether it is due only to updated parking).
  • Confirm if the use is subject to amortization (commercial/industrial in R/OS/Ag) and calculate remaining time if applicable.
  • If seeking to keep operating past termination, prepare a Continuation Permit case showing special circumstances and lack of detriment. File before expiration or within 30 days of a Notice of Termination.
  • For OS-zone uses made nonconforming on 3/2/2010, assess eligibility for a one-time ≤25% Expansion Permit.
  • If the structure was damaged/destroyed, document the percent of loss (watch cumulative voluntary removals) and submit a complete rebuild permit application within 12 months to keep nonconforming rights.
  • Avoid abandonment: do not discontinue a nonconforming use for 180+ days.
  • Don’t “add” a second use while a nonconforming use is present.
  • Check overlay constraints (habitat/wildlife corridors) and special nonconforming structure rules near wildlife crossings.
  • Coordinate early on parking, since it controls many change/expansion paths. See Ventura County Parking.
  • If the nonconformity is a lot size issue, confirm the lot is a legal lot.

Risks & Ambiguities

Issue Why it matters What to verify
50% destruction threshold Crosses the line from “can rebuild as before” to “must fully conform” Accurate floor/roof area calculations; track cumulative voluntary removals; 12-month application timing. § 8113-6.1.1, § 8113-6.1.2, § 8113-6.2.1–.2
“Similar use” changes Determines if a non-amortized nonconforming use can pivot Parking demand equivalency and whether the target use needs a CUP (not allowed). § 8113-5.3.2
180-day discontinuance Abandons rights if exceeded Any proof of continuous operation; dates and evidence of hiatus lengths. § 8113-3.3; § 8113-5.3.3
OS-only expansion pathway Unique, one-time route for some 2010-era nonconforming OS uses Whether the use was rendered nonconforming by the March 2, 2010 changes; 25% cap; public-interest findings. § 8113-5.5
Parking-only nonconformity Often fixable, enabling expansion/change-of-use Ability to meet today’s parking on-/off-site; permit conditions may specify parking. § 8113-3, § 8113-3.1–3.2
Wildlife-crossing setbacks Adds constraints for sites within 200 ft of listed structures Whether expansion is outside the 200-ft area or footprint-neutral and doesn’t increase listed nonconformities. § 8106-6.5.5
Animal-keeping nonconformities 3-year amortization window Whether a Continuation Permit is warranted. § 8113-4; § 8113-5.4

Plain-English Summary

If your use or building in unincorporated Ventura County was legal when established but no longer fits the current rules, you may keep it under specific limits. Watch for 180-day gaps that terminate rights, a 50% damage line that can force full compliance, and special amortization schedules for commercial/industrial uses in residential, open space, or agricultural zones. Some narrow avenues exist—like a one-time 25% expansion for certain Open Space cases—but most changes need to prove no greater impact and often require a discretionary continuance.

Source References

  • Non-Coastal Zoning Ordinance adoption/scope: § 8101-0; § 8101-1; § 8101-2.1 (unincorporated areas; excludes Coastal Zone).
  • Definitions (Nonconforming Use/Structure): Definitions article excerpt.
  • Parking-only nonconformities and 180-day rule: § 8113-3; § 8113-3.1–3.3.
  • Land-only nonconforming uses: § 8113-5.1.
  • Amortization (commercial/industrial in R/OS/Ag) and prohibition on expansion/change: § 8113-5.2; § 8113-5.2.1.
  • Non-amortized uses—change to similar use; abandonment: § 8113-5.3.2; § 8113-5.3.3.
  • Continuation Permit criteria/timing: § 8113-5.4.
  • OS-zone limited expansion: § 8113-5.5.
  • Destruction/rebuild thresholds: § 8113-6.1.1; § 8113-6.1.2; § 8113-6.2.1–.2.
  • No additional uses while nonconforming use exists: § 8113-7.
  • Legal substandard lots: § 8113-8.
  • Involuntary nonconformance (eminent domain): § 8113-9.
  • Wildlife crossings and nonconforming structures in setback: § 8106-6.5.5.
  • Zone matrices and standards references: § 8105-4; § 8105-5; § 8106-1.1.
  • AE zone additional findings for discretionary permits: § 8111-1.2.1.3.
  • ADU context (existing includes legal nonconforming; state limits on denials due to nonconforming conditions): § 8107-1.7; HCD ADU Handbook.

Information Gaps

  • Purpose statements and detailed zone-by-zone dimensional numbers for the districts listed (OS-REC, OS, AE, RA, RE, RO, R1, R2, RPD, RHD, TP, TRU): Not found in retrieved materials. Verify with the jurisdiction using the current matrices and standards.
  • Complete text of § 8113-5.2.1 (Expansion and Change of Use Prohibited) beyond its heading reference: Not found in retrieved materials.

Sources

Retrieved passages

  • Ventura County Zoning Code (§ 7) High relevance
  • Ventura County Zoning Code (§ 7) High relevance
  • Ventura County Zoning Code (Section 8113-5.2) High relevance
  • Ventura County Zoning Code (Chapter or) High relevance
  • Ventura County Zoning Code (Chapter or) High relevance
  • Ventura County Zoning Code (Chapter as) High relevance
  • Ventura County Zoning Code (Section 8107-41) Medium relevance
  • CFC § 2 (§ 2) Medium relevance
  • Ventura County Zoning Code (§ 9) High relevance
  • Ventura County Zoning Code (Article if) High relevance
  • Ventura County Zoning Code (Article if) High relevance
  • Ventura County Zoning Code (Chapter must) High relevance
  • Ventura County Zoning Code (Section 8105-4) Medium relevance
  • Ventura County Zoning Code (§ 4) Medium relevance
  • Ventura County Zoning Code (§ 4) Medium relevance
  • CBC § 9 (Article or) Medium relevance
  • Ventura County Zoning Code (§ 4) Medium relevance
  • Ventura County Zoning Code (Chapter 1.) Medium relevance
  • CBC § 9 (§ 9) Medium relevance

Cited sections

Frequently asked questions

How long can a nonconforming use sit idle in unincorporated Ventura County before I lose rights?

If a nonconforming use is discontinued for 180 days or more, the County deems the nonconforming status abandoned and terminated. Maintain continuous operation or obtain approvals before extended shutdowns. § 8113-3.3; § 8113-5.3.3

My building with a nonconforming use was 40% damaged. Can I rebuild it as before?

Often yes: if the destruction is 50% or less of floor/roof area, you may restore to the prior state if you submit a complete building permit application within 12 months and diligently pursue completion. If damage exceeds 50%, full conformance is required. § 8113-6.1.1; § 8113-6.1.2; § 8113-6.2.1–.2

I have a shop that’s nonconforming only because parking rules changed. Can I expand?

Possibly. Uses nonconforming due solely to parking may continue and expand/change if current parking for the expanded/new use is provided as required. The County can set parking via a permit if needed. § 8113-3; § 8113-3.1–3.2

Can I switch my nonconforming use to a different business?

If the use is not under amortization, a change to a “similar” use with the same or lower parking requirement may be allowed, but not to a use that requires a Conditional Use Permit. § 8113-5.3.2

What’s a Continuation Permit and when do I need one?

It’s a Planning Commission permit to continue a nonconforming use/structure past its sunset. You must show special circumstances and that continuance isn’t detrimental to the public interest, health, safety, convenience, or welfare. File before the permit expires or within 30 days of a Notice of Termination. § 8113-5.4; § 8111-1.2 (permit types)

I’m in the Open Space (OS) zone and my use became nonconforming in 2010. Can I expand some?

A narrow OS-only pathway exists: the County may grant a one-time Expansion Permit up to 25% of existing square footage if specific findings are met. § 8113-5.5

Do nonconforming lots (smaller than today’s minimum) block me from building?

If the lot is a legal lot, you may use it as permitted for the zone, despite not meeting today’s minimum lot area. § 8113-8

Can I add a second (conforming) use while I keep my nonconforming use?

No. While a nonconforming use exists on a lot, no additional principal or accessory use is permitted (except certain animal-keeping cases). § 8113-7

My house is too close to the side yard. Can I add on without fixing that setback?

Possibly. The code allows additions aligned to an existing side-yard nonconformity if conditions are met (e.g., at least 3 feet remains on that side, limits on how far the addition can extend). § 8106-5.15

How do wildlife-crossing setbacks affect my nonconforming structure?

Existing nonconforming structures within 200 feet of listed wildlife crossings remain subject to the nonconforming-structures article; certain expansions may be allowed if fully outside the setback or if they don’t increase the footprint or specified nonconformities. § 8106-6.5.5

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