About Cornejo's Builders Inc

Your local, trusted choice for kitchen and bathroom remodels, ADUs, and home improvement projects in Downey, San Marino, and more of South CA!

Scroll down to discover our mission and what drives us forward

Meet Alexsander

Hi, I’m Alexsander Cornejo, the owner and founder of Cornejo’s Builders. I started working in the remodeling and construction industry with my dad, 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.

Make your Home Upgrade Go smoother with an expert who puts you first


projects done


of families helped


approach to your project

Samantha Garcia


I want to begin by highlighting the prompt response I received when I inquired about their services. One of the most important details for me is quick response. Alexsander was quick to respond and made an availability that was not only quick but worked for me. […]

The home inspection was very thorough. I am looking to tear up the laminate floor (disgusting) and thanks to Alexsander I found out that my old home (built in 1930s) lacks more foundational support.

How did he know? He got down and fit himself as best as he could to check the foundation on the floor (also very well dressed and professional attire). Without asking him Alexsander checked every detail of my home from the inside, outside, corner, etc. 

His quoting? Very fair and I’ve consulted DTLA architects as well as contractors and the pricing is very fair. He’s very open to ideas and has a plethora of recommendations. What’s important to me, is to be listened to and not be persuaded against my vision.

I am looking forward to not only replacing my disgusting laminate floor and having more foundation support but I am excited to also remodel my entire home. You can’t go wrong with this team.

Our Core Values

For me and my team, doing everything by the book is key to a successful remodel and a satisfied client. Our stand by our core values on every project we work on. Here’s what defines us:

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.

Trust Your Home Project With A Team That’s There For You