Custom ADU Contractor in Rowland Heights, CA
- 24 ADUs built in 4 years
- Fast completion timelines
- Constant project updates
- Seasoned and friendly pros
Scroll down to discover options, pricing, and process
Add Smart Living Space to Your Rowland Heights Property
Rowland Heights is known for its family-oriented neighborhoods and multi-generational households. As families grow, many homeowners are looking for ways to add flexible living space without relocating.
An ADU can be used for:
- Private living quarters for parents or adult children
- Rental income opportunities
- Guest houses
- Home offices or creative studios
With proper planning and professional construction, your ADU can blend seamlessly with your existing home while significantly increasing property value.
Here are some ADUs you can get:
- Granny flat
- Home addition
- Garage conversion
- ADU construction
- Bump-outs
- Porches and decks
- Second-story additions
- Attached garages
- Other conversions
Understanding Rowland Heights ADU Zoning Laws & Permit Requirements
Rowland Heights falls under Los Angeles County jurisdiction, which means ADU projects must comply with both California state ADU laws and county-specific regulations.
Important considerations include:
- Maximum ADU size limits
- Setback requirements
- Parking regulations (when applicable)
- Utility connections and sewer capacity
- Fire and safety compliance
Our team handles the entire permitting process, coordinating with local departments to ensure your ADU plans meet all requirements and pass inspections without unnecessary delays.
Our Recent ADU Contractor Project
New 735 sq. ft. Two-Story ADU in Alhambra, CA
This two-story detached ADU builder project included:
- New foundation
- New plumbing
- New electrical
- New HVAC
- New Spanish style finishes
- New custom kitchen cabinets
- New separate Utility connections
Total project cost: $250,000.
The most significant investment was the architectural and structural design package, totaling $15,000.
New 535 sq. ft. ADU in Whittier, CA
This compact yet efficient ADU featured:
- New central AC
- New open concept kitchen/living room
- New rental income property
- New custom finish bathroom tile
- New vinyl engineer flooring
- New level 5 drywall finish
Total project cost: $150,000.
Custom kitchen cabinets with marble countertops were the largest expense at $12,550.
New 798 sq. ft. ADU in Downey, CA
This high-end ADU builder project included:
- New vaulted ceilings
- New level 5 smooth finish
- Smooth finish on exterior stucco
- Customized electrical smart home finish
- Curbless walk-in shower
- Central AC
Total project cost: $200,000.
The premium bathroom tile package was the most expensive feature at $8,000.
Our Simple ADU Design & Build Process
We’ve streamlined our process to make ADU construction efficient and predictable:
1
Collaborate
2
Build
We manage approvals, finalize selections, and prepare for construction.
3
Enjoy
Our team completes construction with consistent communication and thorough quality control.
Why Rowland Heights Homeowners Trust Our ADU Contractors
An ADU is a long-term investment, and choosing the right contractor makes all the difference. We don’t disappear once construction ends we stand behind our work and remain a trusted resource long after your project is complete.
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!!!!
Y
Yahritza Orellana
Had a truly great experience with Alex. Cornejos 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.
J
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.
The Perks Of A Seasoned ADU Contractor In South CA
Take advantage of the best perks of working with a local, trusted ADU contractor here in Downey, San Marino, and surrounding areas.
- Peace Of Mind
Everyone involved in your project is 100% committed to your satisfaction. You’ll be treated with utmost respect 24/7.
- Quality Craftsmanship
You’ll enjoy the best tradesmen here in South California, all ready to deliver the best product you could ever find around here.
- Dialed-in Processes
Remain comfortable while fully enjoying the excitement of getting an ADU. We have the know-how to make it happen!
ADU Contractor FAQs in Rowland Heights, CA
How long does it take to build an ADU in Rowland Heights?
Most ADU projects take approximately 5–8 months depending on permit approvals and construction scope.
Can I legally rent out my ADU?
Yes, ADUs can typically be used as long-term rental units, though short-term rental rules may vary.
Is my property eligible for an ADU?
Do you handle design and permits?
Yes. We manage the entire ADU process from planning and design to final inspection.
Start Building Homes & Get a Free Quote
- Cornejos Builders ADU Construction & Home Building
- 8909 Elmont Ave. Downey, CA 90240
- (562) 319-3178
- alex@cornejosbuilders.com