Homeowners across Los Angeles County are looking for smarter ways to expand their living space without relocating. Whether it’s for extended family, rental income, or a private home office, a professionally constructed Accessory Dwelling Unit (ADU) offers flexibility and strong return on investment. However, without experienced builders, construction delays, inspection issues, and unexpected costs can quickly arise.
At A1 ADU Contractor, we provide expert custom ADU construction services in Los Angeles County. From foundation to final finishes, our team handles every phase with precision, ensuring structural integrity, modern design, and full compliance with county and city regulations.
Constructing an ADU requires more than just building walls — it demands careful coordination, engineering expertise, and attention to detail. Our construction services include:
Energy-efficient construction methods that meet California standards
Problem: Construction requirements can vary across different cities within the county. Solution: Our team ensures your ADU is built according to all applicable building codes and inspection requirements.
Problem: Existing garages or older properties may require reinforcement or upgrades. Solution: We perform structural evaluations and strengthen foundations, framing, and roofing as needed.
Problem: Expanding plumbing, sewer, and electrical systems can be technically demanding. Solution: We coordinate licensed professionals to install utilities safely and efficiently.
Problem: Poor project management can extend timelines and increase costs. Solution: We follow organized scheduling and proactive coordination to keep your project on track.
Adding an ADU felt overwhelming at first, but our A1 ADU Contractor in Sherman Oaks made it feel easy. They communicated clearly and respected our home throughout the process. The crew showed up consistently, even on brisk mornings. The final result is a comfortable, energy-efficient space that stays warm at night and bright during sunny afternoons. Our family absolutely loves it. I highly recommend them to anyone considering an ADU project.
Our experience with an A1 ADU Contractor in Sherman Oaks was honestly refreshing. From the first meeting, they listened to what we wanted and offered practical suggestions. Construction stayed on track despite cooler weather and shorter daylight hours this time of year. The finished ADU looks like it was always part of our home. It’s now a peaceful workspace away from the main house. We’re thrilled with the outcome and highly recommend their services.
Converting the garage into an ADU was a great investment, and this business nailed it. They handled permits, construction, and finishes without me having to chase them around. The new space is cozy, bright, and private.
My garage was just wasted space before this project. The transformation into a livable ADU was done quickly and looks high quality. Every visitor thinks it’s a brand new build, not a conversion.
We are thrilled with the ADU renovation A1 ADU Contractor completed for us. Chris was incredibly knowledgeable and guided us through the whole process seamlessly. The quality of work exceeded our expectations, and we couldn't be happier with our new space!
We wanted a backyard ADU for rental income, and choosing an A1 ADU Contractor in Sherman Oaks was the best move we made. They were patient with all our questions and helped us design something that truly fit our lot. Even after some light winter rain, they kept everything moving smoothly. The craftsmanship is solid and you can tell they care about the details. The space feels modern yet comfortable. We’re beyond grateful and would recommend them without hesitation.
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.
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.
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
Our comprehensive construction solutions cover every aspect of the building phase:
Each ADU is constructed to ensure durability, safety, and long-term property value enhancement.
We begin by reviewing approved plans, assessing the property, and preparing a clear construction timeline.
Our skilled team completes framing, roofing, and all mechanical systems with careful supervision and quality control.
We finalize interiors, exterior detailing, and coordinate inspections to ensure the unit is move-in ready and fully compliant.
You may benefit from professional ADU construction if you notice:
A1 ADU Contractor focuses on precision craftsmanship and reliable project management to ensure every ADU is built to last.
We have successfully completed custom ADU builds ranging from compact backyard cottages to fully equipped detached living units. Each project reflects our commitment to craftsmanship, compliance, and client satisfaction.
We proudly provide custom ADU construction services throughout Los Angeles County, delivering dependable building solutions tailored to local property requirements. Our team ensures every unit is safely constructed, energy-efficient, and ready for comfortable living.
Homeowners value our:
Our strong client satisfaction record reflects our dedication to delivering durable, functional ADUs built for long-term use.
Ready to move forward with your ADU build? Contact A1 ADU Contractor today to begin your custom ADU construction project in Los Angeles County. Our team is prepared to deliver professional craftsmanship, organized project management, and a finished space designed for lasting value.
Call now or submit our contact form to get started.
The cost of a custom ADU construction in Los Angeles County varies widely based on size, design complexity, materials, and site conditions. A basic detached ADU typically starts around $200,000, while a high-end, fully customized unit can exceed $400,000 or more. Key cost drivers include foundation work, utility connections, architectural design fees, and premium finishes. It is crucial to budget for permits, impact fees, and potential site preparation like grading or tree removal. For a detailed breakdown of expenses and the regulatory process specific to the area, we recommend reading our internal article, ADU Construction in Los Angeles County. Working with a licensed contractor experienced in local codes is essential for accurate budgeting and project success.
Our service areas include: Glendale, Burbank, Van Nuys, North Hollywood, Reseda, Bel Air, Mission Hills, Sylmar, Pacoima, Sun Valley, Sherman Oaks, Encino, Studio City, Panorama City, Canoga Park, Tarzana, Valley Village, Toluca Lake, San Fernando, Valley Glen, Lake Balboa, Granada Hills, Winnetka, North Hills, the San Fernando Valley, and throughout Los Angeles County.
13701 Riverside Dr #200, Sherman Oaks, CA 91423
Based in Sherman Oaks, CA, we are your trusted partner ADU building and transforming garages into functional and beautiful spaces. Serving the San Fernando Valley and Los Angeles County.
Sun – Fri: 9AM to 5PM
Sat: Closed
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45 reviews