ADU Building Trends in California

Accessory Dwelling Units (ADUs) have become one of the most popular residential construction trends across California. As housing needs evolve and state regulations continue to support ADU development, more homeowners are choosing to build ADUs to add space, flexibility, and long-term value to their properties.

In Anaheim and throughout Orange County, ADUs are no longer considered a niche upgrade—they are a smart, practical solution for families, investors, and multigenerational households.

Why ADU Construction Is Growing Across California

Several key factors are driving the rapid rise in ADU construction throughout the state:

• Housing shortages: ADUs help increase housing supply without changing neighborhood character
• High home prices and rents: ADUs offer more affordable housing options
• California ADU laws: Streamlined regulations have made ADU approval faster and more accessible
• Multigenerational living: Families need space for aging parents, adult children, or caregivers
• Rental income opportunities: ADUs can provide steady supplemental income

Because of these benefits, ADUs have become one of the most valuable property improvements available to California homeowners.

Common Types of Accessory Dwelling Units Built in California

Every property is different, which is why ADUs come in several forms. The right choice depends on your lot size, budget, and goals.

Detached ADUs

Detached ADUs are standalone structures built separately from the main home. They provide the most privacy and flexibility and are often used as long-term rentals or guest houses.

• Best for: Larger lots, rental income, private living space

Attached ADUs

Attached ADUs share at least one wall with the primary home while maintaining a separate entrance. They typically cost less than detached units and work well on smaller lots.

• Best for: Homeowners wanting additional space without sacrificing yard area

Garage Conversion ADUs

Garage conversion ADUs are among the most popular options in Orange County. Converting an existing garage can reduce costs and shorten construction timelines.

• Best for: Underused garages, budget-conscious ADU projects

Junior ADUs (JADUs)

JADUs are smaller units—typically under 500 square feet—created within the existing home. They often share utilities and are ideal for extended family living.

• Best for: Multigenerational households and smaller properties

Things to Consider When Building an ADU in California

While ADUs offer many benefits, careful planning is essential for success.

Local Zoning and Regulations

Even with statewide ADU laws, cities like Anaheim, Irvine, and Huntington Beach still have local requirements related to setbacks, utilities, and design standards. Working with an experienced ADU contractor helps avoid delays.

Permits and Approvals

ADUs must comply with building codes, fire safety requirements, and utility standards. A knowledgeable contractor will manage the permitting process from start to finish.

Budget and Financing

ADU costs vary depending on size, design, and site conditions. Homeowners should budget for construction, design, permits, and utility connections. Financing options such as home equity loans may be available.

Design and Functionality

A well-designed ADU should be comfortable, efficient, and easy to maintain. Layout, storage, natural light, and privacy are key considerations.

Utility Connections

Water, sewer, gas, and electrical connections must meet city requirements. Utility upgrades can affect both cost and timeline, making early planning important.

ADU Design Trends Shaping California Homes

Modern ADUs focus on comfort, efficiency, and long-term value. Popular trends include:

• Open floor plans that maximize usable space
• Energy-efficient windows and insulation
• Durable, low-maintenance materials
• Separate entrances for privacy
• Full kitchens and bathrooms
• Designs that match the main home’s architecture

These features help ensure ADUs remain functional and appealing for years to come.

Why Choose Aaron Alt Construction as Your ADU Contractor

Choosing the right Accessory Dwelling Unit (ADU) contractor is one of the most important decisions when building an ADU.

Proven Experience

Aaron Alt Construction brings over 13 years of experience, 500+ completed projects, and 400+ satisfied customers to every ADU project.

Full-Service ADU Construction

We handle every phase of the project, including:

• Design and planning
• Engineering and permitting
• Construction and inspections
• Final walkthrough and completion

Our turnkey approach reduces stress and keeps your project on track.

Local Orange County Expertise

As a trusted ADU contractor in Anaheim and Orange County, we understand city-specific requirements across Irvine, Huntington Beach, Newport Beach, Santa Ana, Long Beach, and surrounding areas.

Built for Real Life

We design and build ADUs that are practical, durable, and comfortable—whether your goal is rental income, family housing, or long-term flexibility.

Is an ADU Right for Your Property?

If you’re considering building an ADU in California, working with an experienced contractor makes all the difference. From planning and permits to construction and completion, Aaron Alt Construction helps homeowners turn ADU ideas into high-quality, compliant living spaces.

Serving Anaheim, Orange County, and surrounding Southern California communities.