Local zoning · Ventura County

Ventura County — Overlay Districts

Overlay Districts under the Ventura County local zoning and planning code, with the controlling citations.

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Last reviewed: July 6, 2026

Overview

In unincorporated Ventura County, the Non-Coastal Zoning Ordinance (NCZO) adds “overlay zones” on top of base zoning to impose extra rules, triggers, and processes where special resources or policy priorities apply. Overlays never replace a base zone; they superimpose additional requirements and either restrict or expand what is allowed. The NCZO applies only to unincorporated areas outside the Coastal Zone; parcels split by the Coastal boundary follow NCZO on the non-coastal portion, with Coastal policies considered if effects extend into the Coastal Zone . The ordinance itself states overlay zones are used to superimpose regulations on base zones .

Key idea: An overlay does not change your base zoning; it adds targeted rules (e.g., viewshed protection, lighting limits, wildlife movement setbacks) that can trigger extra permits or prohibit certain features.

Before applying any overlay, confirm the parcel’s base zone under Ventura County Zoning, and check resource-specific layers in County GIS (especially for HCWC/CWPA overlays) as referenced in the NCZO.

How overlays fit with other Ventura County requirements

Overlay Zones — District-by-District

Scenic Resource Protection (SRP) overlay zone

  • Purpose and coverage: Protect viewsheds of designated lakes and scenic highways; added to base zones as “/SRP” . Also states overlays superimpose on base zoning .
  • Typical permitted uses: Uses remain those of the base zone; SRP adds permit triggers and design standards.
  • Key dimensional/permit triggers:
    • A Planning Director-approved Planned Development (PD) Permit is required for: grading over 5 ft height or 1,000 sf area; new structures over 15 ft; any part of a structure within 20 vertical ft of a prominent ridgeline unless not silhouetted; new structure(s) >1,000 sf or >20% of an existing structure within 40 ft; expansions exceeding specified height/size thresholds; removal of ≥1,000 sf of native vegetation .
    • Tree Permit required to alter/destroy any Protected Tree; processed with PD if PD is required .
    • Development must avoid ridgeline silhouette, minimize grading, use non-reflective colors/materials, and limit lighting; tall or off-site signs are restricted .
  • Where it applies: Mapped “Scenic Resource Area” and other scenic areas per Area Plans; confirm map and ridgelines during review .

Mineral Resource Protection (MRP) overlay zone

  • Purpose and coverage: Safeguard access to significant mineral deposits; “/MRP” added to base zones .
  • Typical permitted uses: Base-zone uses continue unless discretionary development would hamper extraction.
  • Key standards:
    • Discretionary development is prohibited if it would significantly hamper or preclude resource access/extraction, unless specified findings are made (public safety, significant public benefit, resource not present, extraction infeasible, or infeasible due to County limits) .
  • Where it applies: Parcels overlain by mapped mineral resource areas; verify with County maps.

Community Business District (CBD) overlay zone

  • Purpose and coverage: Preserve/re-create historic main-street character, enable mixed-use revitalization; “/CBD” suffix added to base zone .
  • Typical permitted uses: Base-zone uses; CBD adds process standards and allows targeted deviations to support pedestrian-oriented, historic contexts.
  • Key standards/process:
    • Ministerial Design Permit required for any exterior alteration or new construction (including signs) when no discretionary permit is otherwise required; must meet adopted area/specific plan design guidelines .
    • Discretionary permit findings must show consistency with CBD purposes and applicable design guidelines .
    • Allowed deviations: minimum setbacks, maximum height, landscaping, and certain sign rules to fit historic context; parking for mixed-use may be modified per CBD standards (coordinate with Ventura County Parking and Ventura County Signage) .
    • Mixed-use development must meet CBD-specific design and compatibility objectives .
  • Where it applies: Identified community business districts in Area Plans/Specific Plans; verify applicable design guidelines.

Temporary Rental Unit Regulation (TRU) overlay zone

  • Purpose and coverage: Manage short-term lodging impacts in Ojai Valley; “/TRU” added to base zones .
  • Typical permitted uses: Dwellings remain per base zone; overlay narrowly authorizes certain rentals.
  • Key standards:
    • Rentals under 30 days are prohibited unless expressly authorized by TRU; homeshares are authorized, but short-term rentals are only permitted on parcels designated as a County “landmark” as of June 19, 2018 (see Ventura County Historic Preservation) .
    • County permit mandatory to rent/advertise/facilitate a homeshare/STR in TRU; permits are one-year maximum terms and expire on sale/transfer; owner-limitations apply (e.g., one permitted property per owner; one unit per multi-unit property) .
    • Operations and property management standards are auto-imposed on permits; violations include failing to meet operating/management or complaint-response standards .
  • Where it applies: TRU overlay boundary in Ojai Valley; confirm overlay mapping.

Dark Sky (DKS) overlay zone

  • Purpose and coverage: Protect night skies and reduce glare/sky glow; “/DKS” added to base zones .
  • Typical permitted uses: Base uses continue; overlay regulates outdoor lighting.
  • Key standards:
    • Applies to all outdoor luminaires (and agricultural luminaires within translucent/transparent enclosures) installed or replaced after November 1, 2018; use of lighting prohibited by standards must cease by November 1, 2019; existing lighting must meet retrofit rules; general lighting standards and prohibited lighting types apply; Article 13 lighting provisions do not apply where DKS does .
    • Exempt lighting and Planning Director-authorized deviations are provided; deviation requests require technical submittals (lumens, kelvin, shielding, lighting plan) and findings of functional equivalence .
  • Where it applies: DKS-mapped areas; confirm with zoning maps.

Habitat Connectivity and Wildlife Corridors (HCWC) overlay zone

  • Purpose and coverage: Maintain wildlife movement and habitat connectivity; “/HCWC” added to base zone .
  • Typical permitted uses: Base uses continue; overlay adds development setbacks, fencing limits, lighting rules, and review.
  • Key standards:
    • Applicability relies on County GIS; standards generally apply to uses/structures needing a discretionary permit or Zoning Clearance after April 11, 2019; more restrictive standards prevail where overlays overlap .
    • Prohibitions include intentional planting of invasive plants; perimeter wildlife-impermeable fencing that encloses a lot; open vertical pipe fence posts in OS/AE zones .
    • Setbacks: PD Permit required for development within 200 ft of wildlife crossing structure inlet/outlet or bridge perimeter; PD or Zoning Clearance required for work within surface water features depending on activity (invasive plant removal vs other work) .
    • Wildlife-impermeable fencing thresholds: Larger enclosed areas may trigger PD Permit; calculations include percent of lot area and consider existing enclosures; mapping and site plan requirements apply; multiple exemptions exist (near dwellings, crop protection, small well enclosures, habitat projects, small lots, road fencing, shooting ranges) .
    • Outdoor lighting standards to reduce wildlife impacts also apply under this section; Article 13 lighting does not apply where 8109-4.8.2 governs lighting .
    • Discretionary permits require biological documentation and feasibility-based siting guidelines to minimize disturbance and maximize contiguous open area; similar findings apply to CWPA below .
  • Where it applies: HCWC overlay areas per County GIS .

Critical Wildlife Passage Areas (CWPA) overlay zone

  • Purpose and coverage: Three critical passage areas nested within HCWC where connectivity is especially sensitive; “/CWPA” added in addition to “/HCWC” as applicable .
  • Typical permitted uses: Base and HCWC uses; CWPA adds stricter applicability to structures, uses, and fencing on larger lots.
  • Key standards:
    • Applies to lots two acres or larger; covers new structures/additions needing a Zoning Clearance/permit, new uses needing a Zoning Clearance/permit, and new or replacement wildlife-impermeable fencing enclosing areas on OS/AE lots; CWPA provisions are in addition to HCWC and more restrictive standards prevail .
    • Discretionary permits require biological documentation and feasibility-based siting consistent with connectivity guidelines (minimize disturbance, maximize contiguous open area, minimize wildlife-impermeable fencing) .
  • Where it applies: Mapped CWPA subareas inside the broader HCWC overlay; verify via GIS .

Mobilehome Park (MHP) overlay zone

  • Purpose and coverage: Maintain mobilehome parks as primary land use in mapped parks; “/MHP” suffix added to base zone .
  • Allowed uses:
    • Principal: Mobilehome parks.
    • Accessory: Structures/uses incidental to park operation for residents/guests (clubhouse, pool, RV storage, laundry).
    • Accessory uses to dwellings; exempt uses; and customary ancillary uses with reasonable expectancy (e.g., filming, wireless), all subject to permits as required .
  • Where it applies: All mobilehome parks in unincorporated areas designated with MHP overlay .

Senior Mobilehome Park (SMHP) overlay zone

  • Purpose and coverage: Preserve senior parks as age-restricted communities; “/SMHP” suffix added in addition to MHP where applicable .
  • Allowed uses:
    • Principal: Senior mobilehome parks.
    • Accessory: Same general accessory framework as MHP, tailored to senior parks .
  • Key occupancy/administrative standards:
    • At least 80% of occupied units must house ≥1 person age 55+; signage/advertising and ongoing age-verification procedures required; periodic submittals to Planning Division are mandated .
  • Where it applies: Mobilehome parks rezoned to SMHP that meet the County’s “senior mobilehome park” definition as of the ordinance’s operative date .

Quick-reference standards and triggers

Overlay What it does Key trigger or limit Permit/Process Code Reference
SRP Viewshed protection Grading >5 ft or ≥1,000 sf; new structures >15 ft or near ridgeline; vegetation removal ≥1,000 sf PD Permit; Tree Permit if Protected Tree; design standards apply § 8109-4.1.2; § 8109-4.1.4; § 8109-4.1.5
MRP Protect mineral resources Discretionary dev. that would hamper extraction Prohibited unless findings (safety, public benefit, resource absent/infeasible) § 8109-4.4.2
CBD Historic main-street character; mixed-use Any exterior work when no discretionary permit Ministerial Design Permit; possible deviations to setbacks/height/landscaping/signs; mixed-use standards § 8109-4.5.2; § 8109-4.5.4; § 8109-4.5.5
TRU Short-term lodging controls (Ojai Valley) <30-day rentals restricted; homeshares allowed; STRs only on pre-2018 landmarks Zoning Clearance; one-year term; owner limits; operating/management rules § 8109-4.6.1; § 8109-4.6.4; § 8109-4.6.4.1; § 8109-4.6.5; § 8109-4.6.11.2
DKS Night-sky protection New/replaced luminaires after 11/1/2018 must meet standards; some lighting prohibited after 11/1/2019 General/Prohibited standards apply; exemptions; Planning Director may authorize deviations § 8109-4.7.1–.2; § 8109-4.7.5–.6
HCWC Wildlife connectivity Prohibits invasive planting & certain fencing; 200-ft wildlife-crossing setbacks; surface-water permitting; fencing area thresholds; lighting controls PD Permit/Zoning Clearance depending on activity; biological documentation; feasibility guidelines § 8109-4.8; § 8109-4.8.2–.3; § 8109-4.8.3.4–.5; § 8109-4.8.3.6–.7; § 8109-4.8.3.8
CWPA Critical wildlife passage Applies on lots ≥2 acres to structures/uses/fencing; more restrictive than HCWC Zoning Clearance/PD as triggered; documentation and connectivity findings § 8109-4.9; § 8109-4.9.1; § 8109-4.9.4
MHP Preserve mobilehome parks Limits principal use to mobilehome parks Uses limited to park and accessory/ancillary uses § 8109-4.10.1–.2
SMHP Preserve senior parks Age-restricted occupancy and verification Uses per SMHP; 80% 55+ occupancy; signage/advertising rules; reporting § 8109-4.11.1–.3.2

Checklist

  • Identify all overlays mapped on your parcel via County GIS; HCWC/CWPA applicability is determined using the Ventura County RMA GIS referenced in the ordinance .
  • Confirm whether your project crosses SRP triggers (grading, height, ridgeline proximity, vegetation removal) and whether a Planned Development permit and/or Tree Permit is required .
  • If in CBD, determine whether a ministerial Design Permit suffices or a discretionary permit is needed; if discretionary, prepare findings and identify any desired deviations to setbacks/height/landscaping/signage .
  • If in TRU, determine if homeshare vs. STR is eligible; confirm “landmark” status for STR; prepare for one-year permit conditions and owner limits .
  • In DKS or HCWC, inventory all existing and proposed outdoor lighting; plan to meet applicable lighting standards or request a documented deviation (DKS); note Article 13 lighting does not apply where these overlay lighting sections apply .
  • In HCWC/CWPA, map wildlife crossing structures and surface water features; evaluate 200-ft setbacks, surface water permitting, and any wildlife-impermeable fencing thresholds/exemptions; include required biological documentation for discretionary permits .
  • For MHP/SMHP, confirm overlay designation; ensure principal and accessory uses fit overlay and, for SMHP, implement occupancy verification and required signage/advertising language .

Risks & Ambiguities

Issue Why it matters What to verify
Ridgeline “silhouette” judgment in SRP Subjective visual finding can trigger PD or redesign Request County staff guidance and photo-simulations; apply SRP design standards early (§ 8109-4.1.2, § 8109-4.1.5)
Defining “wildlife-impermeable fencing” and “enclosed area” HCWC/CWPA thresholds depend on design and total enclosed area Provide a fencing site plan with calculations; confirm exemptions (near dwellings, crops, wells, etc.) (§ 8109-4.8.3.6–.7; § 8109-4.9.1)
Surface water feature boundaries Triggers PD or Zoning Clearance in HCWC Delineate features and setbacks; coordinate with environmental agencies if applicable (§ 8109-4.8.3.5)
TRU “landmark” exception for STRs Only landmarks as of 6/19/2018 are eligible Confirm designation date in County records before applying (§ 8109-4.6.1)
CBD design guidelines vary by area Ministerial approval hinges on guideline consistency Identify the applicable Area/Specific Plan and submit designs consistent with it (§ 8109-4.5.2–.3)
SMHP occupancy compliance Losing 80% 55+ occupancy can affect status Maintain and submit age verification records biennially (§ 8109-4.11.3.2, § 8109-4.11.4)

Information Gaps

  • DKS lighting details: The retrieved materials reference the existence of general and prohibited lighting standards and exemptions, plus the deviation process, but do not list the full technical standards of § 8109-4.7.3 and § 8109-4.7.4. Verify the exact lumen, kelvin, shielding, and curfew requirements with the jurisdiction. Not found in retrieved materials.

Plain-English Summary

If your land in unincorporated Ventura County lies in a special overlay, you still keep your base zoning—but you take on extra rules to protect views, wildlife, night skies, or mobilehome communities. Expect added permits for certain grading/heights in scenic areas, limits on lighting in dark-sky and wildlife zones, fencing and setback rules near wildlife crossings/streams, tighter short-term rental rules in the Ojai Valley, and age-occupancy requirements in senior mobilehome parks, all with specific NCZO sections guiding what’s allowed and how to get approvals.

Source References

  • Non-Coastal Zoning Ordinance: Applicability, adoption, and Coastal boundary context: § 8101-0, § 8101-1, § 8101-2
  • Overlay zones purpose (superimpose regs): § 8104-7
  • SRP: § 8109-4.1.1–.1.2 (application, PD triggers), § 8109-4.1.4 (Tree Permit), § 8109-4.1.5 (design standards)
  • MRP: § 8109-4.4.1–.4.2 (application, permit standards)
  • CBD: § 8104-7.4 (purpose), § 8109-4.5.1–.5.5 (application, design permit, deviations, mixed-use)
  • TRU: § 8104-7.5 (purpose), § 8109-4.6.1–.6.5 (authorization, permit, term, owner limits), § 8109-4.6.11.2 (violations)
  • DKS: § 8104-7.6 (purpose), § 8109-4.7.1–.7.2 (applicability, existing lighting), § 8109-4.7.6 (deviations)
  • HCWC: § 8104-7.7 (purpose), § 8109-4.8 (applicability, lighting), § 8109-4.8.3.3 (prohibitions), § 8109-4.8.3.4–.5 (setbacks and permitting), § 8109-4.8.3.6–.7 (fencing controls), § 8109-4.8.3.8 (permit documentation/guidelines)
  • CWPA: § 8104-7.8 (purpose), § 8109-4.9–.4.9.1 (applicability on ≥2-acre lots), § 8109-4.9.4 (permit documentation/guidelines)
  • MHP/SMHP: § 8104-7.9–.7.10 (purposes), § 8109-4.10–.4.10.2 (MHP uses), § 8109-4.11.1–.4.11.3.2 (SMHP uses, signage/advertising, occupancy)

Sources

Retrieved passages

  • Ventura County Zoning Code (Section 810745.2.4) Medium relevance
  • Ventura County Zoning Code (§ 6) Medium relevance
  • Ventura County Zoning Code (Section 8102-0.) Medium relevance
  • Ventura County Zoning Code (§ 4) Medium relevance
  • Ventura County Zoning Code (§ 8) Medium relevance
  • Ventura County Zoning Code (§ 5) Medium relevance
  • CBC § 8111 (Section 8111-1.1.1) Medium relevance
  • Ventura County Zoning Code (Section 8107-25) Medium relevance
  • Ventura County Zoning Code (§ 5) High relevance
  • Ventura County Zoning Code (Section 8109-4.8.) High relevance
  • Ventura County Zoning Code (Section 8111-1.2) High relevance
  • Ventura County Zoning Code (§ 5) High relevance
  • Ventura County Zoning Code (Section 8109-4.8.3.4.) High relevance
  • Ventura County Zoning Code (§ 4) High relevance
  • Ventura County Zoning Code (Section 8105-4) High relevance
  • Ventura County Zoning Code (§ 4) High relevance
  • Ventura County Zoning Code (§ 5) High relevance
  • Ventura County Zoning Code (§ 5) High relevance
  • Ventura County Zoning Code (Section 8108) Medium relevance
  • Ventura County Zoning Code (Section 8109-0) Medium relevance
  • Ventura County Zoning Code (Section 8109-4.6.8) Medium relevance
  • Ventura County Zoning Code (§ 8) Medium relevance

Cited sections

Frequently asked questions

Does an overlay change what I can build under my base zoning in unincorporated Ventura County?

Generally no—the overlay adds rules on top of your base zone. For example, SRP adds extra permit triggers for grading, height, and ridgeline proximity, but your underlying uses come from the base zone (§ 8109-4.1.2) .

I’m in the Scenic Resource Protection (SRP) overlay—when do I need a permit?

A Planning Director-approved Planned Development permit is required if you exceed thresholds such as grading over 5 ft/1,000 sf, new structures over 15 ft, building near ridgelines, expansions over set percentages, or removing ≥1,000 sf of native vegetation (§ 8109-4.1.2) .

Are short-term rentals allowed in the Ojai Valley TRU overlay?

Rentals under 30 days are prohibited unless expressly authorized. Homeshares can be permitted; full STRs are allowed only on parcels designated as County “landmarks” as of June 19, 2018, and all require a County permit with a one-year term (§ 8109-4.6.1; § 8109-4.6.4; § 8109-4.6.4.1) .

What fences are restricted in the Habitat Connectivity and Wildlife Corridors overlay?

New wildlife-impermeable fencing that encloses a lot, certain perimeter fences, and open vertical pipe posts are restricted. Larger enclosed areas can trigger a PD Permit, with exemptions near dwellings, crops, well enclosures, small lots, etc. (§ 8109-4.8.3.3; § 8109-4.8.3.6–.7) .

How close can I build to a culvert or bridge used by wildlife?

Within the HCWC overlay, any development within 200 ft of a wildlife crossing structure (culvert/bridge) requires a PD Permit; there are also rules for work within surface water features (§ 8109-4.8.3.4–.5) .

Do dark-sky rules require me to replace my existing lights?

Existing luminaires prohibited by DKS standards had to cease use by November 1, 2019; others may continue until replaced but are subject to retrofit rules. New/replacement luminaires must meet DKS general standards; exemptions and a deviation process exist (§ 8109-4.7.1–.7.2; § 8109-4.7.5–.7.6) .

What makes the Critical Wildlife Passage Areas (CWPA) different from HCWC?

CWPA areas are the most sensitive parts within the broader HCWC. On lots ≥2 acres, CWPA applies to more project types (structures, uses, and certain fencing) and requires biological documentation and connectivity-siting findings (§ 8109-4.9.1; § 8109-4.9.4) .

Can a mobilehome park be used for something else if it has the MHP overlay?

The MHP overlay makes mobilehome parks the principal allowed use, with only customary accessory/ancillary uses for residents and guests; other uses are limited and must be consistent with permit conditions (§ 8109-4.10.2) .

What are the occupancy rules in a Senior Mobilehome Park (SMHP)?

At least 80% of occupied units must have one resident age 55+, with signage/advertising and periodic age-verification required by the County (§ 8109-4.11.3.1–.3.2) .

Do overlays apply in unincorporated areas inside the Coastal Zone?

The NCZO applies to unincorporated areas outside the Coastal Zone. For split parcels, NCZO governs the non-coastal portion, but Coastal policies may be used if non-coastal development could adversely affect inside the Coastal Zone (§ 8101-2) .

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