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Custom Home Builder & Remodeling Contractor in San Marino, CA

Build your new home with a reliable local expert here in Downey, San Marino, Cerritos, La Mirada, Whittier, and more of Los Angeles and Orange County!

  • 24 Homes built in 4 years
  • Fast completion timelines
  • Constant project updates
  • Seasoned and friendly pros
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Scroll down to discover options, pricing, and process

Live in Beautiful Space Designed Exclusively For You

Building a new home in San Marino is an opportunity to create a space that reflects your lifestyle, preferences, and long-term plans. Whether you’re expanding your living space, upgrading outdated layouts, or starting fresh with a custom design, our team guides you through every stage so your vision becomes a well-built reality.

Here’s what your new home includes:

  • New foundation
  • New plumbing installation
  • New eletrical installation
  • Up-to-date kitchen
  • Timeless new bathroom
  • Living space and bedroom
  • Crawl space or basement
  • Premium materials
  • High-end finishes

Home Building Projects in San Marino, CA

What Neighbors in San Marino Says About Us

Homeowners across San Marino appreciate our dedication to quality, transparency, and dependable project management. Their feedback highlights our professionalism, clean workmanship, and commitment to completing each project the right way. Take a look at the reviews from local clients to learn why families continue to trust us with their homes.
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Lanny Lam​

Rated 5 out of 5

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.

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Lety Ortega​​​

Rated 5 out of 5

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.

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Yahritza Orellana​

Rated 5 out of 5

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.

Home Builder Cost in Pico Rivera, CA

Understanding San Marino, CA Zoning Laws & Building Permit Requirements

San Marino is known for strict building standards, and understanding local regulations is an essential part of any home construction or remodeling project. Most projects require approval from the City of San Marino Planning & Building Department, including:

  • New home construction Additions
  • Structural changes
  • Electrical, plumbing, and mechanical upgrades
  • Accessory Dwelling Units (ADUs)

 

San Marino also has neighborhood-specific design requirements and architectural guidelines. We assist with preparing plans, submitting permit applications, coordinating inspections, and ensuring your project remains compliant throughout the entire process.

Home Building Cost Near San Marino, CA

Home building prices vary based on size, materials, and project complexity. These sample projects provide a general idea of what nearby homeowners have invested. Actual pricing depends on your design, finishes, and site conditions.

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800 sq. ft. New Home in Montebello

A compact, well-designed new home with modern finishes and standard utilities. Typical features include a functional layout, updated systems, and efficient construction.
  • Level 5 drywall finish for smooth walls
  • Curbless walk in shower
  • New kitchen cabinets and countertops
  • New 2-ton mini split system
  • New vinyl flooring
This project was quoted at $155,000, and the most expensive item was the Milgard French doors at over $13,000.
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750 sq. ft. New Construction Unit in Los Angeles, CA

This project included:

  • New foundation
  • New windows
  • New drywall
  • New balcony
  • New sand finish stucco
  • New electrical and plumbing installation

This home building project was quoted at $175,000, where the most expensive item was the wood framing material, at $15,000.

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682 sq. ft. Master Suite Addition in Long Beach, CA

A spacious bedroom and bathroom addition with premium finishes, expanded foundation, and upgraded systems.

  • Heated flooring
  • Level 5 smooth finish walls
  • Bose sound system throughout the suite
  • Master bathroom
  • Smooth stucco finish
  • New foundation

This project was quoted at $205,000, and the heated floors alone were priced at $15,000 for 620 sq. ft.

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Our Simple 3-Step Process to Home Building

This process is meant to keep you in full control of your investment. We focus on efficiency, quality, and getting the work done in a timely matter. This 3-step process guarantees that.
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1

Collaborate

We discuss your goals, evaluate your property, and create a clear plan that outlines scope, materials, and timeline.
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2

Build

Our team handles architectural plans, permits, gr

oundwork, framing, installation, inspections, and final detail work with structured project management.

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3

Enjoy

Once construction is finished, we walk through the home with you to ensure everything meets expectations and resolve final details promptly.

Certified and Backed by The Biggest Names in the Industry

Our team maintains industry-recognized certifications and partnerships that support long-lasting, high-quality construction. These qualifications ensure that our work meets or exceeds the highest standards in safety, materials, craftsmanship, and compliance.

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Home Builder Who Puts You Front and Center

From the first consultation to the final walkthrough, your project goals guide every decision we make. We prioritize clear communication, transparent budgets, dependable scheduling, and consistent quality control. Your home is built with care, accuracy, and long-term durability in mind.

  • Fast Timelines
Start your project in as quickly as 3 days after our visit, and get the job done in record time without compromising anything.
  • Fair Pricing
Get the best rates on materials and a service reflective of the high-quality craftsmanship you’ll enjoy.
  • Dialed-in Processes

Remain in full control of your project with a dialed-in process that focuses on you, your family, your time, and investment.

Home Builder FAQs in San Marino, CA

Most custom homes take several months from planning to completion. The timeline depends on design complexity, permitting, materials, and weather conditions. After reviewing your project, we’ll provide a detailed schedule so you know what to expect.

Yes. Almost all structural, electrical, plumbing, and mechanical work requires city permits. San Marino has strict building guidelines. We handle all permit submissions and inspection coordination to keep the project on track.

Size, foun

dation requirements, electrical and plumbing upgrades, finishes, and architectural details all influence cost. Once we understand your design and goals, we prepare an accurate written estimate.

Yes. We work with design professionals to create functional layouts and plans that fit your needs while meeting San Marino’s building standards.

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