Summary
- Location
- Ventura County, California, USA
- County-level accepted plans
- 3 accepted plans
- Providers
- 1 provider
- Origin programs
- 1 program
- Plan size range
- 700 to 1,188 sq ft
- Permit sources
- 12 sources
County context
Ventura County Pre-Approved ADU Plans
Browse official city and county pre-approved ADU plan programs in Ventura County, California.
Program Overview
This Ventura County page summarizes source-backed county context for Ventura County, California. The current public dataset lists 3 city program pages in this county and 3 county-level accepted-plan records. County-level plan sources include County of Ventura Building & Safety Division, County of Ventura Resource Management Agency, Ventura County Resource Management Agency, and others. Provider names include County of Ventura Building & Safety Division.
County records may apply only in unincorporated areas or county-administered jurisdictions, so verify the official source before relying on a plan for an incorporated city. County fee and permit data includes 5 fee records and 12 permit requirement records. Missing source fields remain Not listed in source, and directory records do not guarantee permit approval.
Included Locations
City
Oxnard, Ventura County, California, USA
9 accepted plans
City
Simi Valley, Ventura County, California, USA
0 accepted plans
City
Ventura, Ventura County, California, USA
10 accepted plans
County-Level Accepted Plans
3 plans Source-backed record Official county source
- Origin program
- Ventura County, California, USA
- Accepted location
- Ventura County, California, USA
- Size
- 700 sq ft
- Bedrooms
- 1 bed
- Bathrooms
- 1 bath
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Source-backed record Official county source
- Origin program
- Ventura County, California, USA
- Accepted location
- Ventura County, California, USA
- Size
- 900 sq ft
- Bedrooms
- 2 beds
- Bathrooms
- 2 baths
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Source-backed record Official county source
- Origin program
- Ventura County, California, USA
- Accepted location
- Ventura County, California, USA
- Size
- 1,188 sq ft
- Bedrooms
- 3 beds
- Bathrooms
- 2 baths
- Last checked
- Jul 28, 2026
Verify current acceptance, site limits, and permit requirements with the local building department.
Permit Requirements
12 requirementsUnincorporated county
Planning and building permits
An appropriate Planning permit is required when applicable, and a Building Permit is required.
- Source
- Standardized Plans for Accessory Dwelling Units and Farmworker/Animal Caretaker Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- Do not begin construction before the Building & Safety Division issues a valid permit.
All county standard plans
Restrictions on plan modifications
A County standard plan may not be modified without prior Building & Safety approval.
- Last checked
- Jul 28, 2026
- Notes
- Appearance choices do not authorize changes to standardized dimensions or feature locations.
County standard plans
Geotechnical or soils review
A geotechnical/soil report is required for the 1,188-square-foot plan; a waiver may be submitted for review for plans under 1,000 square feet when applicable.
- Last checked
- Jul 28, 2026
- Notes
- Waiver eligibility is site-specific and is not guaranteed.
County standard plans
Hazard and terrain exclusions
The plans are not for Lockwood Valley or areas above 4,000 feet, La Conchita, or adverse geotechnical conditions; slope setbacks also apply.
- Last checked
- Jul 28, 2026
- Notes
- The standard foundations are not designed for added snow load or adverse geotechnical movement.
Site specific
Site plan
A site plan must show structures, setbacks, slopes, protected trees, sewer or septic, utility connections, drainage, topography, streets, and easements.
- Last checked
- Jul 28, 2026
- Notes
- The County fact sheet specifies a 24-by-36-inch format.
Unincorporated county
Water and wastewater clearances
Adequate water supply and sewage disposal must be verified through the applicable well, water-purveyor, septic, or sewer clearances.
- Last checked
- Jul 28, 2026
- Notes
- Required agencies vary with the property's serving systems.
Unincorporated county
Fire review
Fire access, fire flow, and sprinkler requirements must be verified with the Ventura County Fire Protection District.
- Last checked
- Jul 28, 2026
- Notes
- Location-specific fire-severity-zone requirements may apply.
Site specific
Final site-condition review
Building & Safety verifies final clearances, the site plan, fire and flood zones, geotechnical conditions, and truss design before permit issuance.
- Last checked
- Jul 28, 2026
- Notes
- Payment of remaining permit fees is also required.
Unincorporated county
Geographic scope
County housing and ADU permitting resources apply to unincorporated Ventura County.
- Source
- Housing Information
- Last checked
- Jul 28, 2026
- Notes
- Incorporated-city acceptance must be established separately.
Unincorporated county
County site permits
Ventura County standardized plans still require property-specific planning and building permits.
- Last checked
- Aug 12, 2026
- Notes
- Not listed in source
All
County territorial applicability
Ventura County permitting jurisdiction
- Source
- Accessory Dwelling Units
- Last checked
- Aug 13, 2026
- Notes
- Simi Valley acceptance is not inferred.
All
Planning and building permits
Required
- Source
- Accessory Dwelling Units
- Last checked
- Aug 13, 2026
- Notes
- Preapproval does not eliminate parcel review; coastal rules may apply.
Fees
5 fee recordsAll county standard plans
Standardized plan cost
$0
- Source
- Standardized Plans for Accessory Dwelling Units and Farmworker/Animal Caretaker Dwelling Units
- Last checked
- Jul 28, 2026
- Notes
- Free plan access does not waive permit, construction, utility, or professional costs.
Projects requiring plan review
Plan review fee
Variable; calculated as a percentage of applicable permit fees
- Last checked
- Jul 28, 2026
- Notes
- The exact amount is calculated during permitting and may include site-specific reviews.
Unincorporated county
Building permit fee
Variable; calculated from project size, scope, and value
- Last checked
- Jul 28, 2026
- Notes
- Additional trade, issuance, development, agency, and state fees may apply.
Unincorporated county
Ventura County plan document fee
Free
- Last checked
- Aug 12, 2026
- Notes
- Not listed in source
All
Pre-approved plan cost
$0
- Source
- Accessory Dwelling Units
- Last checked
- Aug 13, 2026
- Notes
- The county states the plan layouts are free.
Official Sources
12 sources1,188 Square Feet Accessory Dwelling Unit Construction Set
- Publisher
- County of Ventura Building & Safety Division
- Last checked
- Jul 28, 2026
700 Square Feet Accessory Dwelling Unit Construction Set
- Publisher
- County of Ventura Building & Safety Division
- Last checked
- Jul 28, 2026
900 Square Feet Accessory Dwelling Unit Construction Set
- Publisher
- County of Ventura Building & Safety Division
- Last checked
- Jul 28, 2026
Accessory Dwelling Units
- Publisher
- County of Ventura Resource Management Agency
- Last checked
- Jul 28, 2026
Accessory Dwelling Units
- Publisher
- Ventura County Resource Management Agency
- Last checked
- Aug 13, 2026
Accessory Dwelling Units and Junior Accessory Dwelling Units FAQs
- Publisher
- County of Ventura Building & Safety Division
- Last checked
- Jul 28, 2026
Accessory Dwelling and Farmworker Dwelling
- Publisher
- County of Ventura
- Last checked
- Aug 12, 2026
Checklist for Using a Standardized Plan for Accessory Housing
- Publisher
- County of Ventura Building & Safety Division
- Last checked
- Jul 28, 2026
Housing Information
- Publisher
- County of Ventura Resource Management Agency
- Last checked
- Jul 28, 2026
Permit Fees Collected by Building and Safety
- Publisher
- County of Ventura Resource Management Agency
- Last checked
- Jul 28, 2026
Standard Plans for ADUs and Farmworker Housing — General Information Fact Sheet
- Publisher
- County of Ventura Building & Safety Division
- Last checked
- Jul 28, 2026
Standardized Plans for Accessory Dwelling Units and Farmworker/Animal Caretaker Dwelling Units
- Publisher
- County of Ventura Resource Management Agency
- Last checked
- Jul 28, 2026