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What Is an ADU?

A Homeowner’s Introduction to Accessory Dwelling Units

Accessory Dwelling Units (ADUs) are becoming one of the most popular ways for California homeowners to add flexible living space, generate rental income, or support multigenerational households. Whether you’re exploring a detached backyard home or converting part of your existing structure, Hive ADU helps you understand what’s possible, from concept to construction

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What Is an Accessory Dwelling Unit (ADU)?

An Accessory Dwelling Unit (ADU) is a small, independent home built on the same property as a primary residence and also known as a backyard cottage, in-law unit, tiny house, or granny flat. An ADU typically includes a kitchen, bathroom, living space, and a private entrance. Whether you’re building one for family, rental income, or long-term flexibility, adding an ADU is now easier than ever in both Ventura County ADU regulations and Santa Barbara County ADU regulations, thanks to updated California state laws and Hive ADU’s streamlined process.

I-660 ADU tab image showing exterior detached ADU design

Hive ADU helps you determine what qualifies on your property and makes the process turnkey from start to finish.

What Qualifies as an ADU?

Not every structure qualifies as an ADU, but many homeowners are surprised by what’s allowed. In California, an Accessory Dwelling Unit must be a fully independent living space on the same lot as a primary residence. That means it includes a private entrance, kitchen or kitchenette, sleeping area, and a full bathroom. ADUs can be newly built or created by converting existing space and must follow specific local and state building standards.

Types Of ADU

  • Detached ADUs: A standalone structure, typically built in the backyard. Hive ADU specializes in Ventura and Santa Barbara County detached ADUs.
  • Attached ADUs: Physically connected to the main home, often through a new room addition.
  • Garage Conversions: Existing garages converted into livable units.
  • Junior ADUs (JADUs): Smaller units (max 500 sq ft) within the primary home, often with a shared bathroom.

What You Need To Know When Considering Building An ADU

Key insights every homeowner should review before starting their ADU project

Before starting an ADU project, it’s essential to understand how local zoning, design limitations, permitting requirements, and builder selection can impact your timeline and budget. While California has made Accessory Dwelling Units (ADUs) easier to build, each city and county still has its own unique rules and approval processes. From lot eligibility and utility access to construction timelines and costs, knowing what to expect helps you avoid delays and stay on budget. The resources below will walk you through the most critical topics before building your ADU in Ventura or Santa Barbara County.

Zoning & Lot Eligibility

Not every lot is eligible for an ADU, but most are. Learn how lot size, existing structures, and local overlay zones affect your Ventura or Santa Barbara County building ability.

ADU Design & Size Limits

ADUs offer the most flexibility, but local rules still apply. Before designing your Accessory Dwelling Unit, learn about maximum square footage, height limits, and how much of your lot can be used for building an ADU.

Utilities & Site Access

Will your ADU need a new water or sewer connection? Can it share electricity with the main home? Learn how utilities impact your layout, cost, and approval process. We coordinate directly with your utility providers.

Financing & Rebates

ADUs are a significant investment, including typical construction costs, ADU financing options such as the CalHFA grant, and rebates available to local homeowners. Know your construction costs in advance.

ADU Building Timeline

ADUs in California benefit from a streamlined, 60-day approval timeline, but only with a complete submittal. Our process ensures zoning review, plan check, and inspections are handled efficiently from start to finish.

Choosing the Right
ADU Contractor

Not all contractors understand ADUs. Learn what to look for in a licensed ADU builder.

Explore Hive ADU Models

See all our pre-designed ADU models, floorplans, and design finishes

Thinking about building an Accessory Dwelling Unit (ADU) in Ventura or Santa Barbara County? Download our comprehensive Hive ADU Model Guide to view detailed floor plans, stunning 3D renderings, premium features, and turnkey pricing. Discover the perfect ADU for your property.

From studio to 3-bedroom ADU floor plans, our catalog features bright, space-maximizing designs tailored for homeowners in Ventura and Santa Barbara counties. Our free guide features real-life examples, detailed cost breakdowns, and expert tips for navigating zoning compliance. Whether you’re planning a granny flat, home office, or tiny home backyard rental, get actionable insights to simplify your build.

Our 20 most popular floor plans in one complete downloadable ADU guide.

What's Next?

Start With A 10-minute Call

Ready To Explore Building With Hive ADU?
Let’s discuss your goals and see if the Hive ADU is a good fit. This friendly 10-minute call lets you ask questions and clarify the next steps. No pressure, just honest guidance and advice to understand the Hive ADU experience clearly. We’re here to help you make the most of your property with clarity and confidence. If it feels like a match, we’ll schedule a complete consultation when you’re ready..

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Frequently Asked Questions

All ADUs require a building permit, and most cities must approve compliant applications within 60 days. Hive ADU manages the entire submittal and approval process to keep your project moving forward.

A detached ADU is a completely separate structure from the main home, while an attached ADU shares at least one wall with it. Detached units often allow more design freedom and privacy, which is why they’re a popular choice among homeowners.

Not significantly. In most cases, only the value of the new ADU is reassessed, not your entire property. This means a modest increase in property tax, but nothing close to a complete revaluation.

Yes, we stay current on all local and statewide ADU incentives, including the CalHFA $40,000 grant. Our team can help you determine eligibility and apply as part of your build process.

Most detached ADUs in our area fall between $250,000 and $450,000, depending on size, finishes, and site conditions. Hive ADU offers pre-designed plans that help predict costs with accurate vertical construction estimates. Custom ADUs with premium finishes, vaulted ceilings, or high-end kitchens may fall at the higher end. Whether planning a cozy rental or a spacious guest house, we’ll guide you toward a solution that fits your goals and budget, with full cost transparency from day one.