A1 ADU Contractor

Turning Spaces into a Beautiful, Functional ADU — Custom-Built by Experts with 15+ Years of Experience!

A1 ADU logo
All Reviews 5.0
Facebook
Google 5.0
Yelp 5.0
★★★★★

I hired a contractor to build an accessory dwelling unit in my backyard. From the first consultation to the final walkthrough, the team was professional and knowledgeable. They helped design the unit efficiently, handled all permits, and kept the construction site organized and clean. The quality of work exceeded my expectations, and the project was completed on time. I’m extremely happy with the result.

Tyler James
Tyler James February 25
★★★★★

We replaced our roof this winter in Sherman Oaks and couldn’t be happier. The team was respectful, hardworking, and detail-oriented. Even with occasional rain, they stayed organized and careful. Our home feels safer and looks refreshed. We highly recommend them for anyone needing roofing work.

★★★★★

We hired an A1 ADU Contractor in Sherman Oaks to build a detached ADU in our backyard, and the whole experience honestly exceeded our expectations. Even with the cooler winter mornings and a few rainy days, the crew stayed on schedule and kept everything clean and organized. They explained every step in simple terms so we always knew what was happening. The new space feels warm, bright, and perfect for our in-laws. It’s amazing how smoothly everything went from start to finish. We’re so happy with the final result and highly recommend them to anyone thinking about building an ADU.

James John
James John February 16
★★★★★

I recently hired A1 ADU Contractor for a remodeling project at my home in Sherman Oaks and I couldn’t be happier with the results From the initial planning to the final walkthrough the team was professional communicative and detail oriented They truly did an amazing job bringing my vision to life. If you’re looking for a reliable contractor in the Valley I highly recommend them

Supian Sauri
Supian Sauri January 20
★★★★★

Team worker made the process painless. The garage door conversion turned out seamless . Thanks a lot good service

★★★★★

I had a stressful lockout situation late at night, but AJ Locksmith is a game-changer. I called their emergency number, and the person I spoke with was calm and courteous. The locksmith, Robert, called when he was on his way and arrived in under 20 minutes. He was extremely professional and friendly, taking one look at the situation and unlocking my door without damaging anything. The best part was that the final cost was exactly as quoted over the phone. No surprise charges or hidden here somsd. I would highly recommend this company to anyone in need of a reliable emergency locksmith.

LUIS JORGE
LUIS JORGE January 18
★★★★★

Professional team delivering solid ADU construction, clear communication, dependable timelines, and quality workmanship.

★★★★★

We hired this ADU builder for a garage conversion, and the entire process was seamless. Highly recommend them for any Accessory Dwelling Unit project!

★★★★★

Im glad that i used their service. They really retrofitted the place and it looks brand new. Very functional. And the price was spot on. Completely worth it. I am glad we contracted them

Ashey Murph
Ashey Murph October 23
★★★★★

My garage was just collecting junk, now it’s a fully functional rental unit. The quality of the work is impressive and the attention to detail really paid off. I would definitely hire them again.

Marcus
Marcus October 23
★★★★★

I can honestly say these guys know their craft. They transformed my cluttered garage into a beautiful ADU that looks like it was always part of the house. Everything was completed right on schedule.

★★★★★

The project added real value to our home. The garage door conversion gave us the base to create a small apartment for my parents. The team really cared about how it looked, not just how it worked. I’d happily use them again for another project. Thanks again!

Our ADU Services in Orange County and surrounding areas.

We specialize in transforming underutilized garages into:

We begin with a free on-site consultation to learn how you want to use your ADU — whether it’s for family, guests, rental income, or personal workspace. We listen closely to your lifestyle needs and budget so we can design a space that fits perfectly.

Drop Your Info and We Will Contact You.

Why Choose Us For The Job

Local Experts in Orange County
15+ Years of Proven Experience
One-Stop Solution: Design to Delivery

ADU Contractor Orange County: Our Thinking and Design Process

Our thinking and design process for ADU construction in Orange County is centered around your unique needs, lifestyle, and property. It all begins with a free consultation where we listen carefully to your vision—whether it’s building a rental unit, guest house, or personal workspace. From there, our expert design team creates a custom layout that maximizes space, functionality, and style, while ensuring full compliance with local zoning and building codes. We provide detailed 3D renderings so you can visualize your ADU before construction begins. Our team handles all permitting and paperwork to ensure a smooth, stress-free process. Once approved, our in-house professionals deliver high-quality craftsmanship and on-time construction—transforming your garage into a beautiful, fully livable space that adds lasting value to your home.

Serving All of Orange County and Surrounding Areas!

✅ Irvine | ✅ Anaheim | ✅ Santa Ana
✅ Huntington Beach | ✅ Fullerton | ✅ Costa Mesa …

Not sure if we service your area?

Power Tools We Use

Let's Connect.

FAQ

Do you handle all the permits and approvals?

Yes, we take care of the entire permitting process, including architectural drawings, structural engineering, and submitting plans to your city or county for approval. You don’t have to worry about the paperwork—we’ve got it covered.

What types of ADUs do you build?

We specialize in garage-to-ADU conversions, detached ADUs, and custom living spaces such as studio units, one- and two-bedroom apartments, guest houses, and in-law suites. All designs are customized to your needs.

Can I use my ADU as a rental property?

Yes! Many homeowners in Orange County build ADUs to generate rental income. We ensure your ADU meets all legal requirements for rental use in your local area.

More Questions?

People Also Ask

The cost of an ADU in Orange County varies significantly based on size, design, and site conditions. For a basic, detached 500-square-foot unit, you can expect a starting range of $200,000 to $300,000. More complex projects, such as two-story or larger units with high-end finishes, can easily reach $400,000 to $600,000 or more. Key cost drivers include foundation work, utility connections, permit fees, and material choices. It is crucial to obtain detailed quotes from licensed contractors who understand local Orange County building codes and regulations. Proper budgeting should also account for potential site-specific challenges like grading, drainage, and parking requirements.

The $40,000 grant in California typically refers to the CalHFA ADU Grant Program. This initiative provides forgivable loans of up to $40,000 to qualified homeowners to cover pre-development costs associated with constructing an Accessory Dwelling Unit (ADU) or Junior ADU (JADU). Eligible costs include impact fees, plan check fees, architectural designs, and permit applications. The loan is forgiven if the homeowner completes the ADU and rents it to a low-income tenant for at least five years. This program aims to increase affordable housing stock and help homeowners offset the significant upfront costs of ADU construction. It is a crucial financial tool for making ADU projects more feasible and accessible across the state.

The cost comparison between building an ADU and buying a prefab unit is nuanced. Generally, prefabricated ADUs can be cheaper upfront due to controlled factory construction, which reduces material waste and labor time. However, site-built ADUs, while often having higher initial costs due to custom designs and on-site labor, can offer better long-term value through higher quality finishes, perfect site integration, and potentially greater property value increase. Key factors include site preparation costs (foundation, utilities) which are required for both, local permit fees, and your specific design needs. A prefab might be cheaper for a basic unit, but a custom build could be more cost-effective for complex lots or if maximizing square footage is a priority.

The cost comparison between adding an ADU versus building one depends heavily on your property's existing conditions and local regulations. Generally, converting an existing structure like a garage or basement into an ADU is often more cost-effective, as it utilizes an existing foundation, roof, and walls, saving on major structural expenses. A new, detached ADU typically has higher per-square-foot costs due to site work, new foundations, and separate utility connections. However, an addition that significantly alters your primary home's structure can also become expensive. Key factors include local permit fees, utility hookup costs, and the condition of any existing space. A detailed feasibility study and cost estimate from a licensed contractor like A1 ADU Contractor is essential for an accurate comparison specific to your property.

Finding a reliable residential ADU contractor in Orange County requires careful vetting. Look for licensed, bonded, and insured professionals with specific ADU experience, as local zoning and permitting (like in cities such as Irvine or Santa Ana) can be complex. A reputable contractor will guide you through the entire process, from initial feasibility and design to securing permits and construction. They should provide a detailed, transparent contract and timeline. It is crucial to check reviews, ask for recent references, and verify their standing with the California Contractors State License Board. A good contractor ensures your accessory dwelling unit is built to code, maximizes your property's potential, and provides a smooth building experience.

Finding the best ADU contractor in Orange County involves thorough research and careful vetting. Look for a licensed, bonded, and insured contractor with extensive, verifiable experience specifically in ADU construction, as local zoning and permitting are complex. Check online reviews on multiple platforms and ask for a detailed portfolio of completed ADU projects. Obtain at least three itemized bids to compare scope and cost. A top contractor will clearly explain the process, handle permits, provide a realistic timeline, and communicate proactively. Prioritize those who offer a comprehensive contract covering all phases of work, materials, and payment schedule. Personal referrals from recent clients are invaluable.

The cost of an ADU contractor in Orange County typically ranges from $200,000 to $500,000 or more, depending on the project's scope and specifications. Key factors influencing price include the ADU's size, foundation type, design complexity, and interior finishes. A detached new construction unit generally costs more than a garage conversion. It is crucial to obtain multiple detailed bids that break down expenses for permits, materials, labor, and site work. Always verify that the contractor is properly licensed, insured, and has extensive experience with local Orange County building codes and ADU regulations to avoid costly delays and ensure a compliant, quality build.

When evaluating Orange County construction reviews, it is crucial to look at multiple sources and specific details. Start by checking established platforms like the Better Business Bureau, Yelp, and Google My Business for overall ratings and complaint histories. Pay close attention to reviews that mention project management, communication, adherence to timelines and budgets, and post-completion support. For specialized work like ADU construction, seek out reviews on niche sites or contractor portfolios that showcase relevant projects. A pattern of positive feedback regarding permitting expertise, quality craftsmanship, and problem-solving is a strong indicator. Always verify that the company holds a current, active California contractor license and adequate insurance.

Facebook
Google
Yelp

Overall Rating

5.0
★★★★★

39 reviews

Call Now