Top 7 ADU Construction Companies in Downey, CA

Explore the top 7 ADU construction companies in Downey, CA.

Adding an Accessory Dwelling Unit or ADU to your property is a great way to maximize space and add value to your home. Whether you’re thinking about a rental unit or a comfortable in-law suite, finding the right contractor is key.

Here’s a rundown of the top seven ADU construction companies in Downey, CA, that can help bring your project to life.

1. Cornejos Builders ADU Construction & Home Building

At Cornejos Builders, we love making your ADU vision come to life. With over five years of experience, we’ve gotten really good at building spaces that not only fit your needs but also feel like a natural extension of your home.

Whether you’re dreaming up a cozy in-law suite or a rental unit for extra income, we’ve got you covered from the very first design sketch to the final inspection. We’re all about using high-quality materials and smart, energy-efficient solutions to give your ADU a long, low-maintenance life.

Plus, with our clear pricing and step-by-step communication, you’ll always know what’s happening and what to expect. It’s all about making the process smooth and stress-free, while turning your ideas into a space that feels just right.

See What Our Satisfied Clients Are Saying!

We are very thankful for the positive reviews from our happy customers. Their feedback shows our commitment to quality and inspires us to keep working hard. Take a look at what people are saying about us:

Marco Urbana

★★★★★ 5/5

Really good and professional company. I love the fact that they are bilingual several companies came our to give a estimate but they were by far the most qualified and did a great job.

Andrei Hienadz

★★★★★ 5/5

I had a fantastic experience with Cornejos Builders! They exceeded my expectations in every way. From the initial consultation to the final walkthrough, their professionalism and craftsmanship shone through.

Ready to get started? Let’s make your dream ADU a reality – reach out to us at (562) 319-3178 today!

2. Build My ADU

Build My ADU offers exceptional services for those seeking to add an ADU to their home in Southern California. They focus on creating modern spaces that fit seamlessly into your property.

Their professional approach ensures a high-quality finish, making them a reliable choice for homeowners looking for additional living space or rental income.

paul ramirez

★★★★★ 5/5

Working with the Build My ADU company has been great. Tony, Preston, and Keith were all very helpful in explaining the whole build process.

3. Leli Construction, Inc

Known for their expertise in custom pools and construction, Leli Construction extends their knowledge into ADU builds, providing customized designs and efficient construction services. They specialize in making the most of small spaces, creating ADUs that maximize both functionality and style.

Kevin Ramirez

★★★★★ 5/5

Choosing Leli Construction to bring my backyard dreams to life was one of the best decisions I’ve ever made. From our first phone call, they made me feel like more than just another project—they genuinely listened to my ideas, understood my vision, and worked alongside me every step of the way.

4. ADU Company

ADU Company is a trusted name in the community, offering years of experience in ADU construction. Whether you’re looking to add an in-law suite or an extra rental unit, their team focuses on delivering high-quality designs and efficient project completion.

Malakai Aarav

★★★★★ 5/5

ADU Company Downey-CA was highly professional and provided the shortest timeline for any service. Ask for a free consultation and estimate, you won’t be disappointed!

6. ADU Room Addition Contractor

With over three years of experience in home building, ADU Room Addition Contractor excels at providing professional and efficient ADU construction services. They are well-versed in garage conversions and other home expansions, ensuring that every project meets client expectations.

Steve Parker

★★★★★ 5/5

The highest praise for Ivan. Last week completed the construction of a three-bedroom and two-bath ADU detached from our primary house. From the initial estimate to the completion of the dwelling, they were very professional and the results truly surpassed our expectations.

5. Esco Builders Inc.

Esco Builders Inc. specializes in ADU construction and room additions. With over three years in the business, they are known for their attention to detail and high level of craftsmanship. Their experience in ADUs makes them a solid choice for anyone looking to add additional living space to their property.

J F Real Estate

★★★★★ 5/5

Escobuilders are very talented at building the adu or addition that you need. They do high quality work at a competitive price and are very straight forward.

7. Manny Walls

For over a decade, Manny Walls has been helping homeowners in Downey convert garages into functional ADUs. Their expertise in maximizing space, combined with their commitment to delivering on-time projects, makes them a popular choice for ADU builds in the area.

Sandra Levin

★★★★★ 5/5

Outstanding. Professional, prompt, reliable, honest. Doesn’t get any better than this. Hire this guy and don’t waste your time.

Build Your ADU with Cornejos Builders

Whether you’re looking to create additional rental income or provide a space for family, these top ADU construction companies in Downey are equipped to help you achieve your goals. With trusted expertise and proven results, your dream ADU is within reach.

And if you’re looking for a seamless, stress-free experience, Cornejos Builders is ready to bring your vision to life. With our dedication to high-quality craftsmanship, clear communication, and a seamless building process, we’ll make sure your ADU is completed to the highest standards.

Contact Cornejos Builders at (562) 319-3178 to start your ADU project in Downey today!

Downey, CA, is a vibrant city blending history and progress. Located in Los Angeles County, it features iconic spots like the world’s oldest operating McDonald’s, a symbol of American fast-food culture. The Columbia Memorial Space Center adds to Downey’s aerospace legacy by providing space science education. The city harmoniously combines its past with a vision for the future.