Licensed Contractors in Diamond Bar, California

Diamond Bar has 292 licensed contractors registered with the California Contractors State License Board across 40 trade classifications. The most common specialties are Electrical Contractor (40), Warm-Air Heating, Ventilating and Air-Conditioning (HVAC) Contractor (32), Plumbing Contractor (25). 184 contractors hold general contractor licenses (Class A or B).

All license data is sourced from the California Contractors State License Board (CSLB). Last data update: April 05, 2026.

Contractors by Trade

Building (191)
Electrical (51)
HVAC (40)
Plumbing (29)
Painting (25)
Landscaping (13)
Fire (9)
Limited (9)
Roofing (8)
Earthwork (6)
Solar (3)
Welding (2)
G Miller Development Co Active
License #325200 B Diamond Bar, CA Est. 1976
Pacific Overhead Doors Active
License #373281 D28 Diamond Bar, CA Est. 1979
Joe Clifton Tile Contractor Inc Active
License #401939 C-54 Diamond Bar, CA Est. 1981
Richard L Baugh Dba Cornerstone Construction Co Active
License #427183 B, C-9 Diamond Bar, CA Est. 1982
Dolores K Martin Active
License #430320 C-27 Diamond Bar, CA Est. 1982
A E D Contractors Active
License #441036 A, B +2 more Diamond Bar, CA Est. 1983
Adams Electric Active
License #448001 C-10 Diamond Bar, CA Est. 1983
A W Pirelli Active
License #463755 B Diamond Bar, CA Est. 1984
Kertland Roofing Inc Active
License #510174 B, C-39 Diamond Bar, CA Est. 1987
Jay Arora Active
License #512179 B, C-54 Diamond Bar, CA Est. 1987
Place Construction & Development Inc Active
License #515653 A, ASB +6 more Diamond Bar, CA Est. 1987
Edward Caruso Electric Active
License #529763 C-10 Diamond Bar, CA Est. 1988
Ace Iron Works Active
License #539620 C-23 Diamond Bar, CA Est. 1988
Perspective Landscaping Inc Active
License #541581 B, C-27 Diamond Bar, CA Est. 1988
Kachung Ng Active
License #547015 B Diamond Bar, CA Est. 1988
All About T-Bar Active
License #570421 C-2 Diamond Bar, CA Est. 1989
Tetra Tech Bas Inc Active
License #572017 A, C-57 +1 more Diamond Bar, CA Est. 1989
Good Tidings Construction Inc Active
License #577154 B Diamond Bar, CA Est. 1989
Mac Refrigeration And Air Conditioning Co Active
License #580557 C-20 Diamond Bar, CA Est. 1989
Oxford Painting Active
License #580795 C-33 Diamond Bar, CA Est. 1989
Gregory George Shockley Active
License #584514 B Diamond Bar, CA Est. 1990
M T Quality Construction Active
License #586957 B, C-33 Diamond Bar, CA Est. 1990
Atlantic Air Conditioning Inc Active
License #613226 C-20 Diamond Bar, CA Est. 1991
Jay'S Plumbing Active
License #622850 C-36 Diamond Bar, CA Est. 1991
Joe Cledera Ablay Active
License #629389 B Diamond Bar, CA Est. 1991
Ace Rodil Heating And Air Conditioning Active
License #631042 C-20 Diamond Bar, CA Est. 1991
Duke Builders Corp Active
License #635180 B Diamond Bar, CA Est. 1992
M D B Design Associates Active
License #653762 B Diamond Bar, CA Est. 1992
Master Painting Co Active
License #658145 C-33 Diamond Bar, CA Est. 1992
Able Design & Construction Inc Active
License #668681 B Diamond Bar, CA Est. 1993
Chyr-Shin Paul Tsao Active
License #670052 C-10 Diamond Bar, CA Est. 1993
Arkius Inc Active
License #673454 B Diamond Bar, CA Est. 1993
C S D M Inc Dba Cal Steam Company Active
License #674646 C-4, C-20 +1 more Diamond Bar, CA Est. 1993
Monair Contractors Active
License #677543 B, C-10 +1 more Diamond Bar, CA Est. 1993
G C Plumbing Active
License #681446 C-36 Diamond Bar, CA Est. 1993
Todd Michael Halstead Active
License #685211 B, C-10 Diamond Bar, CA Est. 1994
Cfp Construction Inc Active
License #700920 B Diamond Bar, CA Est. 1995
Power Painting Inc Active
License #711007 C-33 Diamond Bar, CA Est. 1995
Hsu - Da Wang Active
License #712058 B, C-6 Diamond Bar, CA Est. 1995
Professional Tile Installation Active
License #712185 C-54 Diamond Bar, CA Est. 1995
Jae H Lim Active
License #721424 C-27 Diamond Bar, CA Est. 1996
Hardy Landscape Active
License #734646 C-27 Diamond Bar, CA Est. 1997
C - Thirty - Six Inc Active
License #739644 B, C-36 Diamond Bar, CA Est. 1997
Tasco Pacific Fire Protection Active
License #750602 C-10, C-16 Diamond Bar, CA Est. 1998
Jh Builder And Remodeling Inc Active
License #751479 B, C-16 +1 more Diamond Bar, CA Est. 1998
D R O - West Construction Active
License #754069 B Diamond Bar, CA Est. 1998
Sunshine Roofing Inc Active
License #755126 C-39 Diamond Bar, CA Est. 1998
Jorge Lambarena Active
License #759138 B Diamond Bar, CA Est. 1999
Zip Renovation & Air Active
License #762505 B, C-10 +3 more Diamond Bar, CA Est. 1999
Post Electric Company Inc Active
License #768204 C-10 Diamond Bar, CA Est. 1999

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Licensing Resources

How to verify a contractor license
Deposit and payment rules for California contracts
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