Can I Build an ADU in Ventura County? | Factory Home Source
Can I Build an ADU in Ventura County?
The 2026 Guide to Zoning, Costs, Permits & Smart Options
Many homeowners in Ventura County, including Ventura, Oxnard, and Camarillo, are sitting on serious untapped value right in their backyard. Thanks to California’s updated housing laws, building an Accessory Dwelling Unit (ADU) in 2026 is easier, faster, and more profitable than ever.
Whether your goal is rental income, multigenerational living, or boosting property value, this guide breaks down everything you need to know—clearly, legally, and without the confusion.
What Is an ADU?
An Accessory Dwelling Unit (ADU) is a self-contained secondary home built on the same lot as a primary residence. It includes its own kitchen, bathroom, and living space.
Types of ADUs Allowed in Ventura County
Choosing the right ADU depends on your lot, budget, and timeline.
Detached ADU
A separate structure from the main home.
Best for: Long-term rentals, privacy, and maximum resale value.
Attached ADU
Connected to the main house, often sharing one wall.
Best for: Family housing or lower construction costs.
Junior ADU (JADU)
Up to 500 sq. ft., usually converted from existing space like a bedroom or garage.
Best for: Faster approvals and lower upfront investment.
💡 Prefab and factory-built ADUs often fit all three categories and dramatically reduce build time.
Ventura County ADU Zoning Rules (2026 Update)
California state law limits how restrictive local governments can be—and that’s good news for homeowners.
Key ADU Zoning Rules
Maximum Size: Up to 1,200 sq. ft. (depending on ADU type)
Setbacks: Typically 4 feet from side and rear property lines
Parking:
No parking required if within ½ mile of public transit
No replacement parking required if converting a garage
Owner Occupancy: Not required for ADUs through at least 2026
Navigating these rules alone can be stressful. That’s why Factory Home Source manages zoning reviews and permits for homeowners across Ventura, Oxnard, Camarillo, and surrounding areas.
Stick-Built vs. Factory-Built ADUs: Which Is Better?
One of the biggest decisions you’ll make is how to build.
Stick-Built ADUs
Timeline: 12+ months
On-site construction: Loud, messy, weather-dependent
Cost: Often $350–$450+ per sq. ft.
Factory-Built / Manufactured ADUs
Timeline: Built off-site in ~3 months
Minimal disruption: Installed quickly on your property
Cost: Lower cost per sq. ft. with predictable pricing
Factory-built ADUs are one of the fastest and most affordable ways to build legally in Ventura County.
How Much Does an ADU Cost in Ventura County?
Costs vary based on size, design, and construction method.
Typical ADU Cost Ranges
Stick-Built ADU: $300,000–$450,000+
Factory-Built ADU: Often significantly less with fewer surprise costs
By choosing affordable ADU plans from Factory Home Source, homeowners avoid delays, labor overruns, and hidden fees. Pricing is transparent before construction begins.
How Long Does ADU Permitting Take in Ventura County?
Permit review: 60–90 days (state-mandated timeline)
Factory-built advantage: Fewer inspections and faster approvals
Total project timeline: As little as 4–6 months from approval to move-in
Frequently Asked Questions
Can I build an ADU on my property in Ventura County?
Yes. Most single-family and many multi-family properties are eligible under California law, subject to basic zoning standards.
Do I need owner occupancy to build an ADU?
No. Owner-occupancy requirements are currently waived statewide through at least 2026.
What is the maximum ADU size allowed?
Up to 1,200 sq. ft., depending on whether it’s detached, attached, or a conversion.
Can I rent out my ADU?
Yes. ADUs can be rented long-term and are commonly used for passive rental income.
Are manufactured or prefab ADUs legal in Ventura County?
Yes. Factory-built ADUs that meet state and local building codes are fully legal and widely approved.
Do I need parking for an ADU?
Often no—especially if your property is near public transit or you’re converting an existing structure.
Ready to Build an ADU in Ventura County?
Don’t let permits, zoning rules, or misinformation slow you down.
Factory Home Source simplifies the entire process—from eligibility checks to permitting and delivery.
