Accessory Dwelling Units In Norwalk, CA

Upgrade your home and give everyone in your family the space they need with our expert accessory dwelling units in Norwalk, CA.

new ADU exterior built in norwalk california

For homeowners in Norwalk, CA, our accessory dwelling unit expertise is unmatched. Choose us and sidestep the headache of amateur mistakes. Instead of costly do-overs, you’ll bask in the excellence of a job done right the first time.

Our professional team guarantees efficiency and quality, turning your vision into reality. Forget the stress of potential compliance issues—with our expertise, you’re assured a seamless process and an accessory dwelling unit that elevates your property’s value.

interior of an ADU build by Cornejos in California
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.

Industry-Leading Benefits

Our unparalleled services revolutionize the industry, setting benchmarks for excellence and customer satisfaction. Check out the benefits we offer:

With us, you’re getting:

Your Accessory Dwelling Units Project Could Be as Fantastic as These

Your dream addition can mirror the stunning transformations showcased in our portfolio. Let these successful projects inspire your own design. 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

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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!

Real Testimonials From Your Neighbors In Norwalk

We are deeply thankful for our customers’ feedback—it’s the heartbeat of our business. Their satisfaction is our top priority. Check out the beautiful things people have to say about us:

Lanny Lam


Cornejo’s Builders did an amazing job remodeling our kitchen. Alexsander made this experience one of a kind, he was accessible and flexible throughout the process. 

This guy’s knowledge truly guided us to perfect our dream kitchen. He has endless recommendations. The workers were efficient. We appreciate how he handled minor changes we had with professionalism. 

After getting work done by different General Contractors, Cornejo’s Builders definitely sets the bar for the rest. Thank you, Alexsander.


Alexsis Veal​


Called Cornejo’s Builders after seeing their beautiful work on Tik Tok. Spoke to the owner regarding an ADU project. Alex always returned my calls, explained throughly how the project would be completed.  Love how his company is an all in one stop. They definitely handle everything from getting permits, architect, plumbing, electrical etc. Turn key ready, his prices are very reasonable and is willing to work around your budget Alex was very understanding when I explained why I had to put a hold on the the project. He definitely treats his customers like family.

Accessory Dwelling Units Costs In Norwalk

ADUs range from $80,000 to $250,000, depending on the scope of work and size. Instead of guessing the final cost, why not get a free quote, chat with us, and discover a realistic price for your upgrade?

ADU Size Features Included Cost Estimate
New 735 sq. ft. Two-Story ADU (Alhambra, CA) New foundation, plumbing, electrical, HVAC, Spanish style finishes, custom kitchen cabinets, separate utility connections. Quoted at $250,000, with architectural plans at $15,000. $250,000
New 535 sq. ft. ADU (Whittier, CA) Central AC, open concept kitchen/living room, rental income property, custom finish bathroom tile, vinyl engineered flooring. Quoted at $150,000, with custom kitchen cabinets at $12,550. $150,000
New 798 sq. ft. ADU (Downey, CA) Vaulted ceilings, level 5 smooth finish, smooth exterior stucco finish, customized electrical smart home features, curbless walk-in shower, central AC. Quoted at $200,000, with bathroom tile at $8,000. $200,000

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

The cost of accessory dwelling units is subject to a myriad of influences, with each aspect playing a significant role in the overall investment.

The intricacies of your unit’s design can affect the cost. A more complex layout means more detailed work, which can increase expenses.

Selecting high-end materials will reflect in your bill. Opt for durability and aesthetics to ensure your investment is sound.

Larger ADUs require more materials and time to build, which naturally raises the cost compared to smaller units.

Every region has its fees for the necessary permits. These legal requirements are a crucial factor in your total budget.

Establishing connections to utilities like water, gas, and electricity can vary in cost depending on the existing infrastructure.

The condition and layout of your land can impact the price. Clearing land or adjusting for slopes incurs additional costs.

Personal touches and unique features will cause prices to vary. The more customized, the higher the cost tends to be.

Remember, each factor intertwines with the others, influencing your project’s final price tag. Let’s navigate the details together for a transparent and fair quote.

We Respect Your Time & Budget

Our team’s professionalism ensures accurate timelines and budget estimates for your ADU project.

When you invest with us, rest assured that respecting the original budget is paramount. We prioritize transparency from the start, avoiding unexpected expenses and maintaining clear communication throughout.

Meeting our deadlines is a commitment we take seriously. Your ADU will be completed on or before the agreed date, because we value your satisfaction and the importance of timeliness in your home improvement journey.

Effortless ADU Building With Our 3-Step Collaboration Process

Embarking on your ADU project is a breeze with our streamlined 3-step method. We’ve got it all under control—so you can relax and watch your dream space come to life.



Discuss your vision with our experts; we listen and plan meticulously.



Watch as our skilled team efficiently transforms blueprints into reality.



Step into your completed ADU and savor the comfort and new utility it brings.

FAQs About Accessory Dwelling Units In Norwalk

Typically, we can construct most ADUs within just 90 days. Yet, keep in mind that the timeline may extend based on project complexity, materials chosen, and features desired. For precise scheduling, we’ll provide an exact timeframe following our on-site assessment.

All individuals stepping onto your property are trusted, local tradesmen. We exclusively collaborate with top-notch industry professionals, experts who genuinely care about your needs.

Buying materials yourself voids warranty. Let us provide materials & installation for warranty coverage lasting 1 year to a lifetime.

Certainly! You’ll get to view a 3D design of your new ADU before finalizing any materials or design, ensuring your complete satisfaction. The 3D renderings are part of our design-build process to enhance your experience.

Receive a 1-year warranty on all new ADUs we build and materials we provide. Plus, count on our ongoing support and priority service for all your future needs.

A new ADU in Southern California offers a kitchen, bathroom, living room, washer and dryer hookups, 1 bedroom or studio (depending on ADU size), central heating, and utilities. We handle everything, and once we’re done, you’ll have a ready-to-use ADU on the same day!

ADUs range from $80,000 to $250,000, depending on the scope of work and size. Rather than estimating costs, it’s advisable to request a free quote, schedule a consultation, and determine a realistic price for your upgrade.

All ADUs in Southern California must have a permit. But don’t stress! Cornejo’s Builders takes care of everything from planning to construction. Sit back, relax, and witness your dream home become a reality.

Don't Miss Out On The Opportunity

Alexsander Cornejo owner of Cornejo Builders California

Alexsander Cornejos

Investing in an ADU today can significantly boost your property’s value and utility. Don’t wait—discover the profits you’re missing out on. Call us at (562) 319-3178 and let Cornejo’s Builders expertly steer your ADU project to a successful and satisfying completion.

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Andrei Hienadz​

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.

Julie Bean​


Amazing experience with Cornejos builders. From beginning to end- communication was clear as well as expectations. Work was 5 star and every member of the crew was exceptional

I would highly recommend Cornejos builders for ANY project or build. I will continue to use them and refer them for as along as they are available. 

Thank you for your beautiful work at such a competitive price!!!!

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Nestled just southeast of Los Angeles, Norwalk, CA, is a vibrant community rich with landmarks like the historic Norwalk Town Square and the Hargitt House Museum. Its central location offers convenient access to Southern California’s major attractions while maintaining a distinct charm that resonates through its local events and community-focused lifestyle.