Quality Remodeling & Construction In South California

Upgrade your home with an expert who truly cares anywhere in Downey, San Marino, Rancho Palos Verdes, Newport Beach, Cypress, and more!

First-floor open-space kitchen featuring a kitchen island with a white countertop and black cabinets. The wooden floor adds warmth and contrast to the contemporary design. White cabinets in the background complete the sleek and stylish aesthetic, creating a modern culinary space.

Take your home’s comfort to the next level with a seamless and stress-free remodel where you’re the priority.


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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.


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.

– Andrei Hienadz

Our Services

From renovations to design assistance and full-service construction, we treat each project with unparalleled focus and dedication.

ADU Contractor

Get more living square footage and make the most out of your property with a spacious ADU.

Kitchen Remodeling

Rediscover the pleasure of cooking and make room for all the important people in your life.

Bathroom Remodeling

Pamper yourself anytime you want in a pristine bathroom that becomes your own personal oasis.

Home Improvements

Expand your home with an addition or make it feel more like yours with a complete remodel.

Home Building

Live in a home designed and built exclusively for you and your loved ones here in Southern CA.

A Lifelong Partnership With A Reliable Expert

Guarantee your project’s success with an expert who puts you and your investment first. Our continuous education ensures we deliver on our promise every single time.

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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.


Lety Ortega​​​


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.


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.

Fully Enjoy The Excitement Of Your Home Upgrade

Let’s take you on a beautiful remodeling journey where all you need to do is enjoy the ride. This 3-step process ensures a smooth and stress-free experience, start to finish.



Contact us and let’s plan your home upgrade together with our designers.



Remain comfortable and on top of everything while we’re building your dream home.



Have everyone over for dinner and show off your new home to everyone your love!

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 long as they are available. 

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

Let’s Make Your Home Match Your Boldest Dreams​

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