Licensed Contractors in Diamond Bar, California

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)
Hsueh Yu Liao Active
License #769733 B, C-10 +1 more Diamond Bar, CA Est. 1999
Ace Plumbing Co Active
License #785570 B, C-36 Diamond Bar, CA Est. 2000
Pub Construction Inc Active
License #788668 A, B +3 more Diamond Bar, CA Est. 2000
Ss Smith Landscape Active
License #789335 C-27 Diamond Bar, CA Est. 2001
Service Wizards Active
License #797071 C-20, C-36 +1 more Diamond Bar, CA Est. 2001
Kenneth Daley Heating & Air Services Active
License #798187 C-20, C-36 Diamond Bar, CA Est. 2001
Todd Clark Dba Rooter Shooter Active
License #800418 B, C-36 +1 more Diamond Bar, CA Est. 2001
Ralph Salazar Active
License #819223 B Diamond Bar, CA Est. 2003
Ming Chu Chen Chien Active
License #820540 B, C-10 +1 more Diamond Bar, CA Est. 2003
So Cal Hardwood Floors Active
License #824420 C-15 Diamond Bar, CA Est. 2003
Quality Contract Glazing Active
License #826550 C-17 Diamond Bar, CA Est. 2003
M S T Group Inc Dba M S T Construction Active
License #837086 B, C-10 Diamond Bar, CA Est. 2004
Green Air & Refrigeration Active
License #839148 C-20, C-38 Diamond Bar, CA Est. 2004
Xpertcom Solutions Inc Active
License #844669 C-7 Diamond Bar, CA Est. 2004
Sturdi-Quick Building Systems Active
License #862157 B Diamond Bar, CA Est. 2005
Mr A/C Active
License #864636 C-20 Diamond Bar, CA Est. 2005
Daniel C Pun Active
License #866867 B Diamond Bar, CA Est. 2005
Mcdonald Construction Active
License #870492 B Diamond Bar, CA Est. 2006
Pacific Rim Builders Active
License #871504 B Diamond Bar, CA Est. 2006
Ct & T Concrete Paving Inc Active
License #875627 A, C-8 +1 more Diamond Bar, CA Est. 2006
J H Plumbing Active
License #876263 C-36 Diamond Bar, CA Est. 2006
Mirae Construction Co Active
License #876472 A, B +1 more Diamond Bar, CA Est. 2006
Devin Electric Active
License #878672 C-10 Diamond Bar, CA Est. 2006
Mcmaster Mechanical Active
License #879152 C-20 Diamond Bar, CA Est. 2006
Century 25 Developement Co Active
License #879310 B, C-5 Diamond Bar, CA Est. 2006
David Liang Hua Peh Active
License #882040 B Diamond Bar, CA Est. 2006
Summit Hardwood Floors Active
License #886345 C-15 Diamond Bar, CA Est. 2006
Lucas Electrical Active
License #888594 C-10 Diamond Bar, CA Est. 2006
Forest & Sun Arborist Designers Landscapers Active
License #893193 C-27 Diamond Bar, CA Est. 2007
American Resources Corporation Active
License #895201 B Diamond Bar, CA Est. 2007
Liberty Woodworking Active
License #903696 C-6 Diamond Bar, CA Est. 2007
Hardy Landscape Construction Inc Active
License #905954 C-27 Diamond Bar, CA Est. 2007
Green Point Active
License #907419 C-27 Diamond Bar, CA Est. 2007
Falkon Construction Inc Active
License #911791 A, B +2 more Diamond Bar, CA Est. 2008
Petrie Custom Woodworks Active
License #914575 B, C-6 Diamond Bar, CA Est. 2008
Jones Plumbing Active
License #917266 C-36 Diamond Bar, CA Est. 2008
K M K Glazing Contractors Active
License #917948 C-17 Diamond Bar, CA Est. 2008
L L L Development Inc Active
License #923665 B Diamond Bar, CA Est. 2008
Promise Development Group Inc Active
License #925512 B Diamond Bar, CA Est. 2008
D D Y Improvement Corp Active
License #925637 B Diamond Bar, CA Est. 2008
Likai Chen Hvac Inc Active
License #926434 C-20 Diamond Bar, CA Est. 2008
F S Construction Active
License #928966 B Diamond Bar, CA Est. 2009
R A Z Electric Active
License #932271 C-10 Diamond Bar, CA Est. 2009
Castaneda Construction Active
License #932830 B Diamond Bar, CA Est. 2009
Tahada Construction Active
License #934622 B Diamond Bar, CA Est. 2009
Touchstone Construction Development Inc Active
License #938018 B Diamond Bar, CA Est. 2009
Jonathan Ko Active
License #939589 B Diamond Bar, CA Est. 2009
Expedite Plumbing Active
License #939646 C-36 Diamond Bar, CA Est. 2009
Jifeng Yao Active
License #945757 B Diamond Bar, CA Est. 2010
H4 Investment Inc Active
License #950924 B Diamond Bar, CA Est. 2010

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Licensing Resources

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