Top 10 ADU Construction Companies in Norwalk

Explore the top 10 ADU construction companies in Norwalk, CA.

Adding an Accessory Dwelling Unit or ADU to your property can be a fantastic way to increase living space, generate rental income, or accommodate family members. From initial design to the final touches, the following companies specialize in ADU construction in Norwalk, CA, offering high-quality services and expertise to turn your vision into reality.

1. Cornejos Builders ADU Construction & Home Building

At Cornejos Builders, we specialize in turning ideas into fully customized ADUs that feel like an integral part of your home. With decades of experience in Norwalk and the surrounding areas, we take pride in making sure every ADU project is done with careful attention to quality, function, and style.

Our process starts with a detailed consultation where we listen closely to your needs, discuss design options, and help you visualize your new space. From handling permits to managing construction, our goal is to make your experience as smooth and stress-free as possible.

We’re all about quality and work with materials like reinforced concrete and durable framing to ensure a structure that stands the test of time. Plus, with our transparent approach to pricing and timelines, you can count on staying well-informed every step of the way.

Praise From Our Customers

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.

Whether you’re dreaming up a guest suite, a rental unit, or a cozy home office, we’re here to bring that vision to life. Reach out today at (562) 319-3178 to see how we can help!

2. HSL Building Company, LLC

HSL Building Company is known for delivering personalized service and superior craftsmanship in ADU construction. With local expertise and a meticulous approach to every project, they ensure each build aligns with their clients’ vision and budget. HSL specializes in custom building solutions, making them a go-to for unique ADU projects.

Tracey Hoover

★★★★★ 5/5

HSL Building Company works to the highest standards. They went above and beyond to keep the client happy on the smallest to the largest projects. It was a pleasure working with them.

3. Leo and Company LLC

Leo and Company bring a wealth of experience in home additions, including ADUs. Known for smooth communication with town offices and architects, they help streamline the process and ensure that each ADU project adheres to all local regulations and standards. Their quality of work and commitment to customer satisfaction set them apart.

Debbie Koster

★★★★★ 5/5

Leo and his crew were amazing! They were on time, diligent, and finished the two jobs we had for them not only on time, but faster than estimated.

4. Mocciola Construction, LLC

Mocciola Construction offers comprehensive ADU building services in Norwalk. With a focus on detail and quality, they specialize in transforming spaces to meet clients’ needs for additional living areas. Their skilled team makes sure each ADU is both functional and stylish, catering to individual requirements and lifestyle needs.

chris lightner

★★★★★ 5/5

I recently hired Mocciola Construction for a bathroom renovation, and I couldn’t be more pleased with the results. The quality of their work was outstanding.

5. Domus Constructors LLC

Domus Constructors is a trusted home builder that has been creating exceptional ADUs in the Norwalk area for over a decade. Their focus on precision and durability ensures each ADU project is crafted to high standards, providing a blend of style, comfort, and value. Domus offers a full range of services, from planning to construction.

Susan C

★★★★★ 5/5

We highly recommend Domus Constructors LLC. They made our dream house come true. They are a great team

6. Sunny House Design & Build

Sunny House Design & Build combines creativity with technical expertise to produce custom ADUs tailored to fit any property. Their team excels in crafting spaces that add value and functionality, using high-quality materials to guarantee a lasting result. From the design phase to the final build, they’re with you every step of the way.

Patricia Troiano

★★★★★ 5/5

SunnyHouse and the entire crew were fantastic! Sergei, our main point of contact, walked us through the entire project from start to finish

7. Adeo Painters & Home Improvements LLC

Though primarily a painting and home improvement company, Adeo Painters has expanded its services to include ADU construction, offering tailored solutions for additional dwelling units. Their team is known for thorough project execution, clear communication, and a commitment to meeting their clients’ unique needs.

Leslie Maxson

★★★★★ 5/5

I can’t say enough good things about ADEO Painters! Melvin and his team are professional and skilled painters and are truly wonderful.

8. A.M. Santella Construction Company Inc.

With over 45 years in the construction industry, A.M. Santella Construction Company brings expertise and professionalism to every ADU project. They focus on building high-quality, sustainable ADUs that enhance your property and provide additional living space. Known for reliability and durability, they’re a solid choice for any ADU project.

Kelly Cardonna

★★★★★ 5/5

I could not be happier with the service I received from A.M. Santella.

9. EuroWorks Builder LLC

EuroWorks Builder is a versatile construction company that delivers high-quality ADUs in Norwalk. With a focus on functional and modern designs, EuroWorks helps clients bring their vision to life while ensuring compliance with local building codes.

Their team’s attention to detail and dedication to quality make them a great choice for ADU construction.

Mar Kwas

★★★★★ 5/5

Kris and his team did an amazing job on our Mudroom/laundry custom built in project. We were on a time crunch and Kris made it work

10. Sound Renovation, LLC

Specializing in both roofing and ADU construction, Sound Renovation offers services that focus on durability and style. They work closely with clients to design ADUs that meet both practical and aesthetic goals, using materials and construction techniques that ensure a lasting addition to any property.

Caroline Holbrook

★★★★★ 5/5

Adam and his crew were quick to replace my roof and did a great job, they even did a remarkable job with cleanup.

Trust The Pros

With so many options in Norwalk, finding the right ADU contractor is key.

Cornejos Builders stands out with years of experience, a commitment to quality, and a smooth, client-focused process from start to finish.

Let us help you transform your property with a beautiful, functional ADU. Contact Cornejos Builders today to schedule a consultation! (562) 319-3178

Norwalk, CA, is a vibrant community with access to nearby amenities like Cerritos College and the bustling Norwalk Town Square. This growing city offers an ideal setting for homeowners looking to enhance their property value with an ADU.