If you hire this pro, you’re covered by a money-back guarantee. Learn more
If you hire this pro, you’re covered by a money-back guarantee. Learn more
About
At Quantum Construction & Design, we specialize in high-quality home remodeling, custom ADUs, room additions, kitchen renovations, bathroom remodels, and whole-home transformations throughout Southern California.
As a licensed California General Contractor with over 15 years of construction experience and a second-generation contractor, we manage every phase of your project—from design and permitting to construction and final inspection—providing one point of contact throughout the entire process.
Our clients choose us because we prioritize:
• Clear communication from start to finish
• Honest pricing with detailed scopes of work
• Professional project management
• Clean and organized jobsites
• High-quality craftsmanship
• On-time scheduling whenever possible
Whether you’re building an ADU, expanding your home, or investing in a complete remodel, our goal is simple: deliver a finished project you’ll be proud of for years to come.
If you’re looking for a contractor who values integrity, professionalism, and attention to detail, we’d love the opportunity to earn your business.
Contact us today for a complimentary consultation and estimate.
Overview
Hired 11 times
Serves Downey, CA
Background checked
License verified
6 employees
7 years in business
Business hours
SunClosedMon7:00 am - 5:00 pm
Payment methods
This pro accepts payments via Apple Pay, Cash, Check, Credit card, PayPal, Square cash app, Venmo, and Zelle.
Customers rated this pro highly for work quality, professionalism, and responsiveness.
Very good 4.5
18 reviews
5
83%
4
0%
3
6%
2
6%
1
5%
Your trust means everything to us. Learn about our review guidelines.
Read reviews that mention:
Jessica T.
4 weeks ago
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Hired on Thumbtack
Amazing! You can tell when someone is passionate with their work. Willie and his crew went straight to helping me figure out what countertops I wanted. He's very responsive with all my questions and concerns. Definitely recommend
Details: Construction of new kitchen • No, plumbing will not need to be relocated • No, electrical will not need to be relocated • No existing plans - need design suggestions • Residential • Renter, with owner's permission to do this job
Kitchen Remodel
Harold T.
3 weeks ago
We had a great experience with Quantum Construction and Design for our whole-home remodel. Willie, the owner, was easy to work with, always communicated with us, and made sure everything was done right. The house turned out amazing, and we’re really happy with the quality of the work. Definitely recommend Willie and his team!
Frank t.
Jul 13, 2021
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Hired on Thumbtack
Willie and his team are great, we had a plumbing issue with the shower water leaking to the first floor. I sent him some pictures and he gave a quote immediately (more complex problems probably require a detailed inspection) and we arranged for next day meeting.
When his team arrived, they checked out the leak and confirmed that it would be the price we agreed upon.
They worked fast and were creative in their problem solving where another company was unable to solve. They gave a great deal and saved the landlord thousands of dollars compared to the alternative.
They gave us a one year warranty for their service which is indictive of the trust in their work. I greatly appreciate that.
All in all, I think Willie and his team are professional, prompt, highly skilled, and extremely reasonable in pricing.
Would hire again, 10 out of 10!
Details: Install bathroom tiles or flooring • Fix bathroom tiles or flooring • Fix water damage • Master bath • Home
Bathroom Remodel
Katherine A.
Mar 6, 2021
Willie and his team were very professional. I remodeled my entire bathroom and they helped with the design to give me exactly what l wanted. The bathroom is beautiful and I couldn’t be happier. The work crew was on time and very clean. I highly recommend their services and would call them back again.
Mary T.
Dec 23, 2021
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Hired on Thumbtack
If you are looking for high quality work on your home then you should look no further than Quantum Construction. Earlier this year they both designed and constructed an amazing ADU for us. The unit was for a family member who was coming to live with us and who had mobility issues so there were some really speicifc things we needed put in and they were so accomodating. I couldn't have asked for a better experience. This company does absolutely incredible work and I consider myself very lucky to have found them.
Details: I'm just starting • Bedroom • Complete renovation • 1,000 - 1,500 sq ft • Home • I am the owner
General Contracting
FAQs
What should the customer know about your pricing (e.g., discounts, fees)?
Good work isn’t always cheap
How did you get started doing this type of work?
I come from a family that has been in construction for 40+ years, so it was only natural for me to take up contracting. Above all construction has always been a passion of mine since I was a young child, I just love that you could take something old and create a masterpiece.
What advice would you give a customer looking to hire a provider in your area of work?
Always look for a contractor that is communicative, responsive, honest, and transparent with what your project entails.
