ADU Construction Companies in La Mirada, CA
Find the top ADU construction companies in La Mirada, CA! Hire the right team for your project today.
La Mirada has a character of its own, and so do the homes here. When you start thinking about adding an Accessory Dwelling Unit, there’s usually more behind the decision than extra space. It might be about staying closer to family, giving someone their own corner of the world, or planning for what’s next.
There’s no shortage of ADU contractors in and around La Mirada, but the right one depends on what matters most to you: how involved you want to be, how custom the space needs to feel, how much support you’ll need getting through permits, and whether timelines and budget actually hold. Below, we’re breaking down a few of the local companies that specialize in custom ADU builder, starting with our team at Cornejos Builders.
1. Cornejos Builders – Featured Contractor
We’ve been building in this area for a long time. A lot of homes, a lot of stories. Every one of them is different.
When someone hires us for ADU contractors, we don’t see it as another job. You’re opening up your space and asking for something that’s going to sit a few steps from your back door, maybe for decades. That deserves more than a standard plan and a handshake.
The way we work is simple. We handle the entire process—from early design ideas to final inspection. No bouncing between offices, no piecing it together yourself. You talk to us, and we take it from there.
We have a full design team in-house. They’ll walk the site with you, sketch ideas, and work toward something that feels right—not just on paper, but once it’s built. It has to match the way you live and the home you already have. Permits can be a mess.
The back-and-forth with the city, the paperwork, the codes—people usually don’t see how much time it takes. We’ve done this enough times to know where the hold-ups are, and we keep it moving.
Before we start, we give you a full project estimate. Not a range. Not a ballpark. And once we agree on a schedule, we stick to it. You’ll know the date we plan to finish, and we’ll keep that promise. Every ADU comes with warranties on structure, finishes, roofing, and plumbing. But more than that, we build it right the first time.
We know how much it matters. Some companies chase volume. That’s not what we’re built for. We take on fewer projects so we can do them properly. That’s the only way we’re interested in working.
If you’re thinking about building, or just want to talk it through, call us at (562) 319-3178 or Contact Us. Every builder approaches things a little differently. Some focus on speed.
Others on custom design, or broader renovation services. Here’s a look at a few other ADU contractors working in the La Mirada area and what you can expect from each.
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Daisy Tapia
Ronda Welker
Contact us today to start your custom ADU builder in La Mirada, CA!
2. Horizon Remodeling Inc.
Horizon Remodeling Inc. is a licensed and award-winning contractor with over 15 years of experience serving Orange, Los Angeles, San Bernardino, and Riverside counties. The company provides a comprehensive suite of home remodeling services, including kitchens, bathrooms, and interior/exterior work, in addition to specialized ADU and structured additions.
A key component of their service is a professional design division that collaborates with architects and engineers to deliver a complete package of plans, blueprints, and permits, thereby simplifying the process for clients.
Conchita Leslie
We recently had our roof remodeled by Horizon Construction and Remodeling, and we couldn’t be more pleased with the outcome.
3. Innovation Design and Construction Inc.
Innovation Design and Construction Inc. is a prominent provider of custom ADU construction and home renovation services within Los Angeles County, including La Mirada. With more than 15 years of industry tenure, the company’s business model is centered on delivering high-quality, functional, and custom-tailored living spaces.
The firm relies on a network of trusted professionals, including designers and architects, to ensure each project is executed with precision and a high degree of craftsmanship.
Steve S.
4. Gettler Construction Inc.
Gettler Construction Inc. is a licensed and insured general contractor specializing in ADU construction, room additions, and garage conversions in Orange County.
The company’s core philosophy is built on delivering quality, professionalism, and a client-friendly “design-to-build” process that minimizes miscommunication. Gettler presents itself as a partner in home transformation, offering free quotes and a transparent approach that manages every step, from initial consultation and permitting to final construction.
The company’s services are framed around creating functional living spaces for family members or as a source of rental income. With a reputation for delivering high-quality work and a commitment to customer satisfaction, Gettler aims to turn clients’ dreams into a tangible, high-value reality.
Johnny O.
I finally decided to undergo an ADU project on my property. I added 799 SF two bedroom and two bathrooms and I absolutely love the final product. Owner was super professional and well spoken. The team managed my expectation and whenever we faced obstacles, sound solutions were provided within my budget. Paint job was stellar! Had renters ready before it was finished and it’s been rented ever since.
5. Rockwood Homes Inc.
Rockwood Homes Inc. is a licensed general contractor based in the Long Beach area, specializing in ADU construction and home remodeling services, with a specific focus on garage conversion ADUs. The company’s founder, Alan, is a certified ADU Specialist with a background in biology, which he applies to problem-solving and meticulous attention to detail on every project. Rockwood Homes Inc. emphasizes its client-focused approach, priding itself on turning visions into reality through exceptional craftsmanship and transparent communication.
The company offers customized design solutions to meet specific needs and helps homeowners maximize their property’s value by creating additional living spaces that can be used for family or as a source of rental income. The company offers a complimentary 30-minute consultation to discuss renovation goals and financing options.
Mike T.
Rockwood Homes has completed multiple projects for me, and I have had nothing but an amazing experience. Alan is very honest, has a high level of expertise, and has bailed us out from a bad experience with another contractor. He redid inferior work at a fair price and did a great job on our kitchen remodel. I would definitely work with Alan again and strongly recommend his company.
6. Hami Construction Inc.
Hami Construction Inc. is a Los Angeles-based general contractor that offers a wide range of services, including kitchen/bathroom remodels and new construction projects, with a specialization in ADU installation.
The company’s business model is built on providing a comprehensive service package that covers everything from design to permits to construction, with a focus on seamless project execution and clear communication.
Kayla Monchatre
7. Oro Coast Builders
Oro Coast Builders is a full-service, family-owned design and build construction company with over 25 years of experience serving Los Angeles and the Bay Area.
The company is run by a husband-and-wife team who bring a shared passion for design and construction to their work, personally guiding every project from initial concept to the final detail. Oro Coast Builders specializes in ADUs and home extensions, offering a fully customized design process to meet a client’s needs, budget, and property structure.
The company prides itself on treating clients as partners and emphasizes transparent communication, ensuring they are kept informed at every stage of the project. Their approach focuses on meticulous planning, resolving issues quickly, and delivering a smooth, predictable, and enjoyable remodeling experience.
Stah Lehman
Exceptional craftsmanship and service. Oro Coast Builder went above and beyond on our project.
8. Sea Pointe Design & Remodel
Sea Pointe Design & Remodel is a prominent design/build residential remodeling firm that has been serving Orange County since 1986. The company specializes in whole home remodels, additions, kitchens, and bathrooms, with ADUs listed as a provided service. Their comprehensive approach unifies design and construction, offering clients a single point of contact and all-inclusive project pricing.
Sea Pointe uses technology, such as 3D renderings, to show clients what their project will look like before construction begins, which helps to minimize changes and stay on schedule. The firm is a recognized leader in the industry, having received multiple awards and having nearly half of its business come from repeat clients and referrals.
Kirk Kelly
9. Trinity Builders & Design, Inc.
Trinity Builders & Design, Inc. is a family-owned and operated construction company with over 20 years of experience serving the greater Los Angeles area. The company’s team includes an adept designer and an experienced general contractor who work together to ensure every detail of a project is covered, from aesthetics to building codes.
Trinity Builders specializes in delivering high-quality ADUs, home additions, and home renovations. The company is distinguished by its client-centric philosophy, which includes a commitment to constant communication and responsiveness. The team prides itself on treating each project “like they were building it for themselves,” ensuring exceptional workmanship and attention to detail. They offer peace of mind by managing the entire process, from initial consultation to permitting and construction.
Jonathan Israel
Tamir and Asi are amazing. Asi helped us with design work for our bathroom and guided us along the way to ensure our dreams became a reality. They even put in new floors when we were on vacation – we hardly had to do a thing! Couldn’t imagine working with anyone else!!
10. Tuscany Builders and Design
Tuscany Builders is a full-service design-build firm specializing in custom ADUs, guesthouses, and room additions in Los Angeles and Orange County. With over 47 years of experience, the owner, who holds three building licenses, is actively involved in every project to ensure precision and expertise. The company operates on a “one-project-at-a-time” philosophy, prioritizing quality over volume to deliver a personalized, “hands-on” experience. They handle the entire process from design and permitting to material selection and construction.
The company provides clients with 3D renderings and walk-through videos so they can visualize their new space before construction begins. Tuscany Builders is an award-winning, licensed, bonded, and insured company with a reputation for seamless, stress-free remodels.
Susan Short
Closing Thoughts
Adding an ADU takes more than a good idea—it takes follow-through. From design to permits to construction, there are a lot of moving parts, and each one needs to be handled with care. It should fit the way your home already works, not feel like it was dropped in as an afterthought.
We manage the process from start to finish, keep the timeline honest, and build with attention to every detail—nothing rushed, nothing halfway done.
If you’re ready to take the next step or just want to talk through what’s possible on your property, call us at (562) 319-3178 or send a message here.
La Mirada, California, is a city built on a mix of suburban calm and unexpected character. It’s home to Biola University’s picturesque campus and a vibrant arts scene centered around the La Mirada Theatre for the Performing Arts. You’ll also find the Splash! La Mirada Regional Aquatics Center which becomes a hub for families and visitors in the summertime. With those spots and a garden‐like neighborhood feel, La Mirada offers both small‑town comfort and little cultural touches worth exploring.