Custom ADU Contractor in La Habra, CA
La Habra keeps growing, and the smartest thing happening on a lot of these streets is what homeowners are doing with the space they already own.
Why La Habra Homeowners Choose Cornejos Builders for ADU Construction
We’ve been building accessory dwelling units across Southern California for years, and La Habra is one of those markets where properties have more potential than their owners realize.
In four years, our team has completed 24 ADU projects. We handle the full scope of ADU construction in La Habra, from detached ADUs and garage conversions to junior ADUs and new additions built on the foundation of your main home.
What keeps clients coming back and sending their neighbors our way is simple: we show up, we communicate, and we finish what we start. No vague estimates, no hidden fees, and no silence when things get complicated.
Our team knows local regulations well, and we treat the permitting side of this job with the same seriousness we bring to the build itself.
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.
- 5-year workmanship warranty included
- 24 ADUs completed successfully
- Constant updates throughout construction
- Experienced, approachable crew
- Garage conversions and additions
- Full-service from permits to final walkthrough
What La Habra Homeowners Say About Us
We could describe what great ADU construction looks like, but it lands differently from people who have actually gone through the process. Read what La Habra homeowners have shared about working with our team below.
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alondracastillo1
After browsing some time to find a contractor that met our standards, we finally had the pleasure to work with Cornejos Builders. From the beginning of the project to the end Alex and his team committed to being consistent with communication in every aspect and was extremely informative when we had any questions regarding the project.
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Daisy Tapia
Highly observant to detail or changes that others often over look. Gives various options on products and communicates in a professional manner. I really admire the work ethic.
What Does an ADU Actually Cost in La Habra, CA?
ADU construction in La Habra typically runs between $80,000 and $250,000, and that range reflects the fact that ADUs are full construction projects with many moving parts.
Ballparking a number without knowing your specific property, scope, and goals is never a good idea. The most useful thing we can do is sit down with you, go through the details, and build a realistic quote together.
The five pricing factors that matter most:
- Size and Layout
A 400-square-foot junior ADU and a 1,200-square-foot detached ADU are completely different builds. More square footage means more materials, more labor, and more time on site.
- ADU Type and Complexity
A garage conversion ADU costs differently from an above-garage ADU or a brand-new detached build from the ground up. Each ADU type has its own complexity, and complexity shapes cost.
- Site Conditions and Property Constraints
Not every lot in La Habra is the same. Slope, soil conditions, yard space, and equipment access all affect the cost of foundation work and site prep.
- Finishes, Design, and Custom Features
A custom ADU with high-end finishes is going to cost more than a clean, functional rental unit with standard materials.
- Permit and Soft Costs
Every ADU project in La Habra requires permits, and the city has its own fees and approval timelines. We handle permits for our clients as part of our process.
Your build will have its own cost based on your specific scope, so reach out, and we’ll put a real number together.
Budgets We Respect and Timelines We Keep
Starting an ADU project raises questions about money and time, and we’d rather address both upfront than let them simmer.
An ADU is one of those investments that earns its keep. A finished rental unit in La Habra generating $1,500 to $2,000 a month means that over ten years, a $150,000 build has more than paid for itself, on the same property you already own.
Our team sets realistic timelines and sticks to them. We treat your home with care throughout the entire construction process, leave the site clean at the end of every day, and communicate immediately if anything changes. Delays happen in construction, but we handle them honestly and adjust the plan with you, not around you.
Your ADU, Handled from the First Conversation to Move-In Day
Building an ADU involves permits, engineering, inspections, materials, and a dozen other details. Our job is to handle all of that so you don’t have to.
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Collaborate
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Build
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Enjoy
FAQs About Accessory Dwelling Units in La Habra, CA
How long does it typically take to build an ADU in La Habra?
Most ADU projects run between six and twelve months from permit approval to final inspection, depending on the type and scope of the build. Garage conversions tend to move faster than new detached ADUs built from the ground up. During your consultation, we’ll give you a realistic timeline specific to your project so you’re not left guessing.
Do I need permits to build an ADU in La Habra?
Yes, every ADU project in La Habra requires permits, and the city has specific rules around setbacks, height, and allowable square footage. We manage the entire permit process for our clients, so this is handled, not handed off to you.
Will an ADU increase my property value?
Absolutely. Additional living space on the same property is one of the more reliable ways to raise a home’s market value, particularly in LA County, where housing demand holds steady. A well-built ADU adds square footage, rental income potential, and real estate development value that both appraisers and future buyers respond to.
Can I build an ADU on a smaller lot?
Usually, yes. ADU types, such as junior ADUs and attached ADUs, are specifically designed for properties with limited yard space. The best way to understand your options is to have us take a look and tell you honestly what your lot can support.
Ready to Put Your La Habra Property to Work?
Alexsander Cornejos
There’s a version of your property that includes a finished ADU, a steady income stream, a comfortable place for family, or simply more space to live in. We’d like to help you get there.
Call us at (562) 319-3178 or visit our contact page here to start the conversation. If you want to learn more about our approach before reaching out, you can read more about our accessory dwelling unit services and see the full range of what Cornejos Builders offers in La Habra and across Southern California.
La Habra is a city with a strong community feel and the kind of quiet pride that shows up in well-kept neighborhoods and local institutions. Families spend weekends at Portola Park and bring their kids to the Children’s Museum at La Habra, one of the more beloved spots in the area. The City of La Habra has also made meaningful strides in supporting ADU development, making it an increasingly smart place for homeowners in La Habra, CA, to invest in.