Updated: Apr 06, 2026
Location and Projects
Address
6990 CENTER AVENUE, Alta Loma, CA, 91701
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Zengquan Zhai Construction
Zengquan Zhai at 6990 CENTER AVENUE, Alta Loma, CA 91701, held a General Contractor license (#621886) with the California contractors license board with an expiration date of 06-30-1997. We last verified the license was expired on 04-05-2026.
Their BuildZoom score is 0 because we haven’t been able to verify an active license. As a result, they’re not ranked in the top 50% of 336,931 California contractors.
If you’re thinking about hiring them, we recommend double-checking their license status with your local licensing authority. Alternatively, use our project planner to be easily matched to qualified, licensed professionals in your area.
Zengquan Zhai Services
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Zengquan Zhai Contact Information
Phone Number: (714) 989-4628
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Address: 6990 CENTER AVENUE, Alta Loma, CA 91701
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Zengquan Zhai Alta Loma
Quality
Alert*
Pro tip:
We generally recommend hiring a contractor with a score higher than 95.
*No active license on file. If you are Zengquan Zhai, click “This is My Business” to update your information.
Activity
|
1 project
|
2026 |
|
3 projects
|
2025 |
|
1 project
|
2024 |
|
1 project
|
2023 |
Our building permit records indicate that Zengquan Zhai has worked on at least
6.0 projects over the past 3 years.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
This is an overview of this contractor's activity. Click here to access our complete licensing and building permit database.
Pricing
|
1 project
|
$20k-$50k |
Pro tip:
For more details about their pricing, check out their recent activity to see how much they have charged for different types of work.
This is a sample of this contractor's permits. Click here to access their complete permit history.
(eplan) detached adu
Valuation:
N/A
Permit #:
00964983-RADU
Status:
triage
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
773 sf garage conversion to (2) bedroom (1) bathroom adu
Valuation:
$30,920
Permit #:
YL-0077435
Status:
issued
Fee:
$2,978
Permit Type:
N/A
Building Type:
N/A
New air conditioning and replace existing furnace
Valuation:
N/A
Permit #:
00812497-AC
Status:
final
Fee:
$264
Permit Type:
N/A
Building Type:
N/A
New air conditioning and replace existing furnace
Valuation:
N/A
Permit #:
00811075-RMO
Status:
triage
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Non-bearing partition wall non-bearing partition wall to divide living room and kitchen. *investigation fee has been applied* *carbon monoxide/smoke alarms are required for this project per 2016 crc section r314/r315
Valuation:
$0
Permit #:
B17-0465
Status:
Issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Kitchen and bathrooms remodel kitchen fixtures and (3) bathroom fixtures change outs. owner/builder no workers compensation. *investigation fee has been applied to this permit
Valuation:
$0
Permit #:
B17-0391
Status:
Issued
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
(eplan) roof mounted photovoltaic system with panel upgrade. must have reroof permit prior to installation of solar panels
Valuation:
N/A
Permit #:
00887712-RRA
Status:
final
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
(eplan) roof mounted photovoltaic system. revised kw and module details
Valuation:
N/A
Permit #:
00895155-SOLR
Status:
triage
Fee:
$277
Permit Type:
N/A
Building Type:
N/A
Service panel upgrade 200 amp
Valuation:
N/A
Permit #:
B17-0680
Status:
final
Fee:
$137
Permit Type:
Meter panel
Building Type:
N/A
Massage technician
Valuation:
$0
Permit #:
COD2007-06032
Status:
Closed
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
(eplan) install (1) gas outlet for mobile bbq
Valuation:
N/A
Permit #:
00975185-MISR
Status:
issued
Fee:
$198
Permit Type:
N/A
Building Type:
N/A
(eplan) install (1) gas outlet for mobile bbq
Valuation:
N/A
Permit #:
00974769-RMO
Status:
triage
Fee:
N/A
Permit Type:
N/A
Building Type:
N/A
Jb0002434547 - 2374 tamalapais ave - vault replacement
Valuation:
N/A
Permit #:
EP25-0264
Status:
issued
Fee:
N/A
Permit Type:
Utility
Building Type:
N/A
Temporary sign - display banner massage grand opening to display from 9/25/07 to 10/9/07 and 10/25/07 to 11/09/07 (nt)
Valuation:
N/A
Permit #:
BLD2008-02059
Status:
expired
Fee:
$50
Permit Type:
N/A
Building Type:
N/A
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Zengquan Zhai Reviews
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Zengquan Zhai License info
Inactive License
| License # | 621886 |
| Status | Inactive |
| State | California |
| Type | General Building |
| Business Type | Sole Ownership |
- According to the California Contractors State License Board, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Zengquan Zhai at the California Contractors State License Board.
This is a sample of licensing data; click here to access a complete history.
ALERT*
BuildZoom Score
- How the BuildZoom Score works
- *No active license on file. If you are Zengquan Zhai, click “This is My Business” to update your information.
Bonded
| Bonded Agent | This License Filed A Contractor's Bond With |
| Bond Value | $5,000 |
10
Permits
- Building permit records show that Zengquan Zhai has worked on 10 permitted projects.
Zengquan Zhai Employees
JZ
James Zengquan Zhai
Sole Owner