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Licensed General Contractors in Diamond Bar, California

Updated November 1, 2026 from CSLB's public license file · B General Building Contractor

  • 180licensed general contractors
  • 171active (Clear)
  • 5%with a suspension
  • 64.4%workers' comp exempt
  • 8.1 yrsmedian time licensed
  • 56.7%corp / LLC / partnership (43.3% sole owner)
  • 21new in the last 12 months
  • —change tracking began November 1, 2026

CSLB's public data lists 180 general contractors with a mailing address in Diamond Bar, and 171 of them (95%) show a Clear primary status.

64.4% report a workers' comp exemption, 6.7 points higher than the statewide figure for general contractors (57.7%), so many of these businesses say they have no employees. The share with a suspension (5%) is close to the Los Angeles County rate for the same license (4.5%).

Experience varies: 43.3% have been licensed 10+ years and 21 are new this year (median 8.1 years, vs 15.3 statewide).

General contractors hold CSLB's B (General Building Contractor) license, which covers projects that combine two or more unrelated trades. See the B General Building Contractor guide for what the license covers.

How to check a general contractor's license in Diamond Bar

  1. Look the company up by name or license number (search Diamond Bar). On the profile, confirm three things: Clear status, the B license for this kind of work, and a contractor's bond on file.
  2. Re-check the same number on CSLB's Instant License Check the day you sign; our copy is refreshed weekly and 5% of Diamond Bar listings here already show a suspension.
  3. Match the license holder's name to the name on the written contract and the person you meet. Since 64.4% of Diamond Bar general contractors claim a workers' comp exemption, ask who will actually do the work. Hiring checklist.

50 of 180 general contractors in Diamond Bar

Diamond Bar general contractors sorted with Clear licenses first, then by years licensed. Badges reflect CSLB's file dated November 1, 2026, not a rating of anyone's work.

Licensed general contractors in Diamond Bar
Business nameLicense #StatusYearsWorkers' compBond
Miller G Development CO 325200 Clear 50 None On file
Cornerstone Construction CO 427183 Clear 44 Exempt On file
A E D Contractors 441036 Clear 43 Exempt On file
Kertland Roofing INC 510174 Clear 39 Insured On file
Arora Jay 512179 Clear 39 Exempt On file
Place Construction & Development INC 515653 Clear 39 Insured On file
Perspective Landscaping INC 541581 Clear 38 Insured On file
M T Quality Construction 586957 Clear 36 Exempt On file
Shockley Gregory George 584514 Clear 36 Insured On file
Ablay Joe Cledera 629389 Clear 35 Exempt On file
Duke Builders Corp 635180 Clear 34 Insured On file
Fedorow Michael Steven 652125 Clear 34 Exempt On file
M D B Design Associates 653762 Clear 34 Exempt On file
Monair Contractors 677543 Clear 33 Exempt On file
Halstead Todd Michael 685211 Clear 32 Exempt On file
C F P Construction INC 700920 Clear 31 Insured On file
Wang Hsu - Da 712058 Clear 31 None On file
C - Thirty - Six INC 739644 Clear 29 Insured On file
D R O - West Construction 754069 Clear 28 Exempt On file
Lambarena Jorge 759138 Clear 27 Exempt On file
Zip Renovation & Air 762505 Clear 27 Insured On file
Liao Hsueh Yu 769733 Clear 27 Exempt On file
Ace Plumbing CO 785570 Clear 26 Exempt On file
Pub Construction INC 788668 Clear 25 Insured On file
Rooter Shooter 800418 Clear 25 Exempt On file
J L J Construction 817273 Clear 23 Insured On file
Salazar Ralph 819223 Clear 23 Insured On file
Chien Ming Chu Chen 820540 Clear 23 Exempt On file
M S T Construction 837086 Clear 22 Exempt On file
Sturdi-Quick Building Systems 862157 Clear 21 Exempt On file
Pun Daniel C 866867 Clear 21 Exempt On file
McDonald Construction 870492 Clear 20 Exempt On file
Pacific Rim Builders 871504 Clear 20 Exempt On file
Mirae Construction CO 876472 Clear 20 Insured On file
Peh David Liang Hua 882040 Clear 20 Exempt On file
American Resources Corporation 895201 Clear 19 Insured On file
Falkon Construction INC 911791 Clear 18 Insured On file
Petrie Custom Woodworks 914575 Clear 18 Exempt On file
L L L Development INC 923665 Clear 18 Insured On file
D D Y Improvement Corp 925637 Clear 17 Exempt On file
Promise Development Group INC 925512 Clear 17 Exempt On file
F S Construction 928966 Clear 17 Exempt On file
Castaneda Construction 932830 Clear 17 Exempt On file
Tahada Construction 934622 Clear 17 Exempt On file
Touchstone Construction Development INC 938018 Clear 17 Insured On file
Ko Jonathan 939589 Clear 17 Exempt On file
Yao Jifeng 945757 Clear 16 Exempt On file
Consma INC 951561 Clear 16 Insured On file
H4 Investment INC 950924 Clear 16 Exempt On file
Ning Construction 958376 Clear 15 Exempt On file

See all 180 general contractors in Diamond Bar

Source: CSLB public data · Updated November 1, 2026 Status can change at any time. Verify on CSLB's Instant License Check.

Frequently asked questions

How many licensed general contractors are in Diamond Bar?

CSLB's current public file lists 180 general contractors with a Diamond Bar mailing address. 171 have a Clear status, and 87.2% show no issues at all in the file (no suspension, no pending action, bond on file, not near expiration).

What license does a general contractor need in California?

Look for B on the license. 180 businesses in Diamond Bar hold it. Small jobs under $1,000 with no permit and no employees are exempt; everything else needs a license (details).

How do I check a general contractor's workers' comp?

Each profile shows the workers' comp type, insurer and policy dates from CSLB's file. Among Diamond Bar general contractors, 64.4% are exempt (no employees), 31.7% insured and 3.9% without current coverage. Verify a policy with CSLB's insurer search (step by step).

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Guides