Licensed Contractors in Diamond Bar, CA
Updated November 1, 2026 · Data from CSLB's public license file
- 311licenses
- 94.5%Clear
- 5.5%suspended (state 4.6%)
- 56.3%workers' comp exempt
- 9.1 yrsmedian time licensed
- 33new in 12 months
CSLB's license file shows 311 contractors with a Diamond Bar address, across 4 trades with at least 20 licensees each (the biggest is general contractors). 5.5% have a suspension, compared with 4.8% across Los Angeles County and 4.6% statewide.
Licensed trades in Diamond Bar
Smaller trades in Diamond Bar (under 20 licensees) are searchable:
- General Engineering Contractors (14)
- Painters (12)
- Low Voltage Contractors (10)
- Landscapers (9)
- Limited Specialty Contractors (8)
- Tile Contractors (8)
- Flooring Contractors (6)
- Roofers (5)
- Fire Protection Contractors (5)
- Refrigeration Contractors (4)
- Cabinet and Finish Carpentry Contractors (4)
- Concrete Contractors (3)
- Insulation Contractors (3)
- Glazing Contractors (3)
- Sign Contractors (2)
- Elevator Contractors (2)
- Water Conditioning Contractors (2)
- Earthwork and Paving Contractors (2)
- Drywall Contractors (2)
- Septic and Sanitation Contractors (2)
- Solar Contractors (1)
- Masonry Contractors (1)
- Pool Contractors (1)
- Structural Steel Contractors (1)
Suspensions in Diamond Bar, by reason
Explainers: Suspended: contractor's bond · Suspended: workers' compensation · Suspended: no qualifying individual · Suspended: liability insurance
Newest Clear licenses in Diamond Bar
| Business name | License # | Status | Years | Workers' comp | Bond |
|---|---|---|---|---|---|
| Jh Advanced HVAC Solutions | 1163754 | Clear | <1 | Insured | On file |
| Amehs Windows & Glass Doors | 1163528 | Clear | <1 | Exempt | On file |
| Lili Sheng | 1163154 | Clear | <1 | Exempt | On file |
| Big Demolition and Construction | 1162961 | Clear | <1 | Exempt | On file |
| Vanguard Plumbing | 1161936 | Clear | <1 | Exempt | On file |
| Kun Ho Shin | 1161518 | Clear | <1 | Exempt | On file |
| Aquarena Water Conditioning | 1160847 | Clear | <1 | Insured | On file |
| Jing Y Electrical Services | 1160291 | Clear | <1 | Exempt | On file |
| Myung Won I Kim | 1159753 | Clear | <1 | Exempt | On file |
| Steven Jiang | 1158255 | Clear | <1 | Exempt | On file |
Source: CSLB public data · Updated November 1, 2026 Status can change at any time. Verify on CSLB's Instant License Check.
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