Quantum Construction & Design
Licensed general contractor in Los Angeles, California
Quantum Construction & Design holds CSLB licence 1061867, active, licensed since 2 Jan 2020, rated 3.8 from 13 Google reviews. Bonded for $25,000 with Business Alliance Insurance Company. Clean CSLB record, with no citations, complaints or legal actions disclosed.
Report card
- Licence activeCSLB #1061867, class B. Issued 2 Jan 2020, expires 31 Jan 2028.
- Licensed 7 yrsSince 2 Jan 2020.
- Bonded$25,000 with Business Alliance Insurance Company, since 10 Nov 2025. California requires the same $25,000 bond of every contractor.
- Workers' comp insuredBerkshire Hathaway Direct Insurance Company, policy N9WC933604, valid to 2 Feb 2027.
- Clean CSLB recordNo citations, complaints or legal actions disclosed.CSLB record
- Website shows the licenceTheir own site displays licence #1061867.
- On the BBB, not accreditedIts BBB rating, complaints and reviews are on its Better Business Bureau profile.BBB profile Complaints Reviews
- 20 building permits since 2020Pulled under this licence (City of Los Angeles, LADBS), most recently 10 May 2023.
Checked against the Contractors State License Board (CSLB) register on 4 Nov 2026.
About Quantum Construction & Design
- People on the licence
- Willie Rodriguez Griffin (qualifier, CEO and president)
Google reviews
3.8(13 reviews)Bryan Peralta★★★★★ 8 months ago
Willie at Quantum Construction is a stand-up dude and extremely knowledgeable. You can definitely trust him to get the job done right. He has years of experience, and I can always rely on him when I have questions. As a fellow contractor, this is the kind of guy you want in your corner—very knowledgeable with great work on ADUs, new construction, and more. I’d highly recommend Willie and Quantum Construction for any …
Frank Salazar★★★★★ a year ago
A huge shoutout to Willie Griffin and the team at Quantum Construction And Design for their exceptional work and professionalism! Willie’s integrity, attention to detail, and problem-solving skills truly set him apart. His proactive approach and clear communication had a significant impact on our City of Los Angeles ADU project. A standout moment—during inspections, the Building and Safety Inspector was so impressed …
perfec toyslas★★★★★ a month ago
Quantum Construction and Design delivered outstanding work on our renovation project. Their creativity, professionalism, and attention to detail made the entire process smooth and stress-free. We are extremely happy with the results.
tone s★★ 11 months ago
Willie started as a good contractor during project ideation but hasn’t followed up with any fixes on our ADU project after the fact. We’ve had so many issues with plumbing and mold due to the lack of accountability from him and his team. We’re still dealing with some of the fallout and still no word or response from Willie. I’d highly recommend you look elsewhere for your contractor needs.
Klay Smith★ 10 months ago
BEWARE I’m writing this from a place of deep frustration and genuine concern for anyone considering working with Quantom Construction . We were forced to live in a hotel for months because our project was ignored for MONTHS after the agreed-upon deadline. This wasn’t a small delay or a minor inconvenience , it was the direct result of ongoing neglect, broken commitments, and a complete lack of urgency to finish the j…
Read all 13 reviews on Google Reviews and photos from Google, refreshed every 30 days.
Recent permits
Building permits pulled under licence #1061867, from City of Los Angeles, LADBS open data. Locations are shown to ZIP code only.
- 10 May 2023 · Bldg-Addition · ZIP 90062ADDITION TO (E) GARAGE TO CREATE (N) ADU PER LAMC 12.22 A.33(c) AND (
- 10 May 2023 · Bldg-Addition · ZIP 90039New irregular-shaped 378 square foot addition to rear of existing sing
- 16 Mar 2023 · Bldg-Alter/Repair · ZIP 90016EPLAN. SUPPLEMENTAL TO 22016-10000-32379 removing large scope of wo
- 6 Dec 2022 · Bldg-Addition · ZIP 90016ADD 25'-0" X 15'-3" BEDROOM AND BATHROOM TO THE (E) SFD. WORK DONE PE
- 17 Oct 2022 · Plumbing · ZIP 90094Apartment
Why it ranks #4148 of 9,857 general contractors in Los Angeles
Score 60.8 / 100. Claiming this listing or using Theo never changes it. How we rank
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