Accessory Dwelling Units In Cerritos

Enhance your home and give everyone in your family the space they need with the help of our expert accessory dwelling unit services here in Cerritos.
Accessory Dwelling Units In Cerritos

Homeowners in Cerritos looking for professional accessory dwelling unit services need not look further. Our team has been the trusted choice for years, providing unmatched quality and precision

Instead of facing the hassle of cramped living spaces, our clients enjoy spacious, beautifully designed units that perfectly meet their needs.

By choosing our expert services, you say goodbye to the risks of poorly executed construction projects and hello to efficiency, increased home value, and a smooth, stress-free experience

We tailor each project to fit your unique requirements, ensuring satisfaction and transforming your vision into reality with unparalleled expertise.

a backyard area with a shed and green grass in the yard is surrounded by trees, shrubs and bushes on both sides
Alexsander Cornejo owner of Cornejo Builders California

Alexsander Cornejo – Owner of Cornejo Builders

Hi, I’m Alexsander Cornejo, the owner and founder of Cornejo’s Builders. I started working in the remodeling and construction industry right out of high school, in 2009.

With Cornejo’s Builders, the goal is to give back to the city I grew up in. I want to send a message of hope and inspiration: any dream can be achieved, no matter where you come from, if you put in enough work and dedication.

Unmatched Benefits For Your Convenience

Our exceptional service level and benefits have revolutionized the accessory dwelling unit industry, setting unprecedented standards for quality and satisfaction. 

Discover the difference by seeing the benefits we offer:

Your Accessory Dwelling Units Project Could Look As Good as These

Imagine your home transformation looking just as amazing as the photos below. These examples serve as perfect inspiration for your own project. 

Take a look at the gallery below to get a sense of the level of quality of our services:

60+ projects done

100+ of families helped

1:1 approach to your project

CW-logo-short-black bg
Alexsander Cornejo owner of Cornejo Builders California
Unsure about choosing us? Request a quote to get to know us better! Let’s discuss your project. Or, call us at (562) 319-3178 now!

What Your Neighbors In Cerritos Say About Us

We are truly thankful for the positive feedback from our customers. Their experiences highlight the value and quality of our work. 

Check out the beautiful things people have to say about us:


Jenna Laricchia​


Cornejos Builders Inc did excellent work for my kitchen remodel project.

I really appreciate Alex efforts in fulfilling my goals, not to mention I had fun working with the team who gave me excellent quality service and ideas for my project. I am extremely satisfied; not to mention the reasonable timeline to finish the job with no hassles.

I wish Cornejos Builders Inc great success! I highly recommend Cornejos Builders Inc to anyone who is looking to get construction work done.


Yahritza Orellana​


Had a truly great experience with Alex. Cornejo’s Builders just completed converting my crawlspace/basement into an ADU (studio with new bathroom and kitchen).

What made the experience even more valuable was that the owner himself (Alex) came over for a consultation. Other companies just send their sales reps and most of the time they don’t even know anything. Feeling important is always a positive I can’t wait to work with them again.

I highly recommend them. You can tell Alex is passionate about what he does, his clients, and his company.

Accessory Dwelling Unit Costs In Cerritos

ADUs range in cost from $80,000 to $250,000, depending on the project scope and size. Avoid estimating the final expenses; instead, seek a complimentary quote, engage in a consultation, and determine a practical price for your renovation.
Project Included Total Cost
Alhambra, CA (735 sq. ft.) New foundation, plumbing, electrical, HVAC, Spanish style finishes, custom kitchen cabinets, separate utility connections $250k
Whittier, CA (535 sq. ft.) Central AC, open concept kitchen/living room, rental income property, custom finish bathroom tile, vinyl engineer flooring, level 5 drywall finish $150k
Downey, CA (798 sq. ft.) Vaulted ceilings, level 5 smooth finish, exterior stucco with smooth finish, customized electrical smart home finish, curbless walk-in shower, central AC $200k

Factors Which Can Influence The Costs Of Accessory Dwelling Units In Cerritos

Several factors can significantly impact the cost of building an accessory dwelling unit in Cerritos. Understanding these variables can help you better anticipate your project’s budget.
Larger ADUs require more materials and more extensive work, increasing the overall cost.
High-quality materials are more durable and aesthetically pleasing but can also elevate the price of the project.
Simple designs are cost-effective, while intricate layouts with unique architecture can raise the price.
Adding custom features like skylights or built-in shelving can make your ADU unique but also adds to the cost.
The complexity of securing permits varies, and the fees can account for a portion of your budget.
Establishing independent utilities for your ADU, like electricity and plumbing, can influence the total expense.

Strict Budget & Timeline Adherence

At Cornejos Builders, professionalism is paramount. We provide accurate timelines and budget estimates, ensuring no surprises along the way.

We respect the budget set at the beginning. We understand the importance of financial planning and commit to working within the agreed budget. Our expertise allows us to anticipate and mitigate potential cost overruns, ensuring your financial peace of mind.

Our dedicated team strives to complete your project before our deadline. We prioritize efficient and effective work without compromising quality. Our proactive planning and execution mean your ADU will be ready for you to enjoy sooner than expected.

Our Easy 3-Step Process For Succesful Projects

Choosing us for your project means stepping onto a hassle-free path to your dream accessory dwelling unit. Rest easy knowing we cover every angle, ensuring a smooth and enjoyable experience from start to finish. 

Here’s how it works in three simple steps:



Together, we define your vision, targeting exactly what you need in 10-15 words.



Our expert team gets to work, transforming plans into reality efficiently and precisely.



Step into your completed ADU and start enjoying the new space we’ve created together.

Accessory Dwelling Units In Cerritos - FAQs

Typically, constructing ADUs takes approximately 90 days. Yet, it’s vital to note that the duration may extend based on project intricacy, materials, and amenities. A precise timeframe will be provided post site evaluation.
All visitors to your property are trusted, local tradespeople. We work solely with top industry experts committed to putting your needs first.
Avoid voiding the warranty by choosing our material procurement and installation services. Our warranties range from 1 year to a lifetime, ensuring coverage for your purchases.

Certainly! Before finalizing any material or design choices, take advantage of previewing a 3D model of your new Accessory Dwelling Unit (ADU). This ensures your complete satisfaction with the renovation. 

The 3D visualizations are pivotal in our design-build approach, enhancing your overall happiness with the outcome.

Absolutely! Get peace of mind with a 1-year warranty on construction and materials when you have a new ADU built by us. Count on our ongoing support for top-notch assistance whenever you require our services down the line.

Introducing a fresh ADU in Southern California, featuring a kitchen, bathroom, living room, washer and dryer hookups, 1 bedroom or studio (based on ADU size), central heating, water, gas, and electrical setups. 

We handle all aspects, delivering a fully furnished ADU upon completion of construction!

Accessory Dwelling Units (ADUs) typically range in cost from $80,000 to $250,000, depending on the project’s size and complexity. 

Rather than relying on ballpark figures, it’s advisable to request a complimentary quote, consult with experts, and set a practical budget for your renovation.

Absolutely! Every Accessory Dwelling Unit (ADU) in Southern California needs a permit, but don’t worry. Cornejo’s Builders Inc. manages all aspects from design to permits and construction, allowing you to sit back and witness your dream home become a reality.

Upgrade Your Home With a New Living Quarters Today

Alexsander Cornejo owner of Cornejo Builders California

Alexsander Cornejos

Investing in an ADU is the smart choice that pays off, offering extra space or a rental income stream you’ll wish you had earlier. 

With our expertise, adding an ADU becomes a hassle-free process, enhancing your property’s value and utility. 

Reach out to (562) 319-3178 and trust Cornejo’s Builders to make your investment worthwhile.

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Cerritos, nestled in the heart of Los Angeles County, is a vibrant community known for its rich cultural heritage and modern amenities. Renowned landmarks like the unique Cerritos Library with its iconic Titanic-themed Children’s area, the Cerritos Center for the Performing Arts offering world-class entertainment, and the picturesque Heritage Park, make Cerritos a remarkable place to live, enhancing its appeal for homeowners looking to invest in Accessory Dwelling Units.