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Licensed contractors in Diamond Bar, CA 297 active licenses list Diamond Bar as their address in California Contractors State License Board's License Master file, file dated November 6, 2026.
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General building (B) 129 5 Zero INC #1105104 · expires May 31, 2027 Ablay Joe Cledera #629389 · expires July 31, 2027 Acemd Corporation #1111963 · expires October 31, 2027 Alliant Construction Services INC #1061441 · expires December 31, 2027 Alpha Construction Services INC #1015331 · expires June 30, 2028 American Resources Corporation #895201 · expires April 30, 2027 Apex Construction Builder INC #1074739 · expires April 30, 2027 Apt Construction INC #1149695 · expires January 31, 2028 B7 Builders #1065231 · expires April 30, 2028 Big Demolition and Construction #1162961 · expires October 31, 2028 Big Elephant Construction INC #1031703 · expires October 31, 2027 Big Mango Renovation INC #1121648 · expires June 30, 2028 Blue Star Contractor #1120031 · expires April 30, 2028 C F P Construction INC #700920 · expires January 31, 2027 Cabinets 4 You LLC #1112243 · expires May 31, 2028 Carve Modular Corporation #1154699 · expires May 31, 2028 Castaneda Construction #932830 · expires May 31, 2027 Centaline Construction INC #1145427 · expires October 31, 2027 Chen Fangzhou Construction #1040290 · expires June 30, 2028 Chen Ichien #1080792 · expires September 30, 2027 Consma INC #951561 · expires April 30, 2028 D A S Builder INC #1044031 · expires July 31, 2027 D D Y Improvement Corp #925637 · expires December 31, 2026 D R O - West Construction #754069 · expires September 30, 2028 Datang Building Service INC #1103658 · expires April 30, 2027 Dayone Construction #1157614 · expires July 31, 2028 Dcloud Homes #1106436 · expires August 31, 2027 Donglianglu #1145119 · expires October 31, 2027 Dongqiang Lu #1139854 · expires July 31, 2027 Dreamer Construction and Development #1125664 · expires August 31, 2028 Duke Builders Corp #635180 · expires January 31, 2028 Dyconn INC #1093822 · expires July 31, 2028 Dz Prime Construction #1129072 · expires November 30, 2028 Ecp Construction #1150062 · expires February 29, 2028 Evercraft Construction INC #1122597 · expires June 30, 2028 F S Construction #928966 · expires January 31, 2028 Freddie Vega #1138185 · expires May 31, 2027 G L Construction Group INC #994049 · expires June 30, 2028 Gary & Son Construction #1138649 · expires June 30, 2027 H4 Investment INC #950924 · expires August 31, 2028 Hamya INC #1125118 · expires August 31, 2028 Henry Roger #980170 · expires January 31, 2027 Home Builders Incorporated #1047096 · expires November 30, 2026 Hong Construction #1142230 · expires August 31, 2027 Hong Ding Construction INC #1038313 · expires April 30, 2028 Hu Peter Yiping #1053475 · expires May 31, 2027 Huamei Construction INC #1051093 · expires March 31, 2027 Huang Jamie Jinzuo #1055726 · expires July 31, 2027 J K Z Group INC #1080141 · expires August 31, 2027 J L J Construction #817273 · expires August 31, 2028 Jae Do Lee #1140383 · expires July 31, 2027 Jiancai Construction INC #1141118 · expires July 31, 2027 Joe Construction Group #1140095 · expires July 31, 2027 Jt Project Management INC #1116801 · expires February 29, 2028 Jung Young Chai #1051661 · expires March 31, 2027 Justprime Construction INC #1153105 · expires April 30, 2028 Ko Jonathan #939589 · expires October 31, 2027 Kun Ho Shin #1161518 · expires September 30, 2028 L L L Development INC #923665 · expires June 30, 2028 Lambarena Jorge #759138 · expires February 28, 2027 Ld Construction #1154620 · expires May 31, 2028 Lexar Construction #1074012 · expires March 31, 2027 Lhw Construction INC #1095664 · expires August 31, 2028 Lili Sheng #1163154 · expires October 31, 2028 Lizarraga Ricardo A #1109743 · expires September 30, 2027 M & E Management Group INC #969068 · expires January 31, 2028 M D B Design Associates #653762 · expires September 30, 2028 Malo Douglas Charles Construction #972557 · expires May 31, 2028 Mcdonald Construction #870492 · expires January 31, 2028 Mengqi Construction #1150260 · expires February 29, 2028 Miller G Development Co #325200 · expires December 31, 2027 New Life Construction #1148327 · expires December 31, 2027 New Life Construction and Renovation #1039347 · expires August 31, 2028 Nexera Builders INC #1037400 · expires March 31, 2028 Nexville Construction INC #1035410 · expires January 31, 2028 Ning Construction #958376 · expires March 31, 2027 Oceanlux Construction INC #1153579 · expires May 31, 2028 Pacific Rim Builders #871504 · expires January 31, 2028 Park Jonghyun #1071186 · expires November 30, 2026 Pathfinder Construction #1141723 · expires August 31, 2027 Paul Quijano #1115522 · expires January 31, 2028 Peh David Liang Hua #882040 · expires August 31, 2028 Pjcy Renovation #1095968 · expires August 31, 2028 Primo Hand Construction & Services #962220 · expires June 30, 2027 Promise Development Group INC #925512 · expires November 30, 2026 Property Investment and Development Group #1006865 · expires August 31, 2027 Pun Daniel C #866867 · expires November 30, 2027 Qed Factory INC #1153759 · expires April 30, 2028 Riva Property Management #1053668 · expires May 31, 2027 Rodriguez & Sons General Construction INC #976744 · expires September 30, 2028 S V L Construction Operations #1131331 · expires January 31, 2027 Salazar Ralph #819223 · expires April 30, 2027 Samuel J Lee #1060372 · expires November 30, 2027 Servicemaster Restoration By Disaster Services #1113356 · expires November 30, 2027 Seven Diamonds INC #1143632 · expires September 30, 2027 Shockley Gregory George #584514 · expires October 31, 2028 Shoreline Construction and Development #1141851 · expires August 31, 2027 Sim Derek #977202 · expires September 30, 2028 Song Construction #1151604 · expires March 31, 2028 Steven Jiang #1158255 · expires July 31, 2028 Stl Home Build INC #1136498 · expires April 30, 2027 Sturdi-Quick Building Systems #862157 · expires November 30, 2027 Sunrise Building Group INC #1155622 · expires May 31, 2028 T&L Building Group #1137830 · expires May 31, 2027 Tahada Construction #934622 · expires June 30, 2027 Tian Qi #971912 · expires April 30, 2028 To the Max Construction #998426 · expires November 30, 2026 Top Choice Construction Service INC #1105149 · expires May 31, 2027 Top Point Construction INC #1016784 · expires August 31, 2028 Touchstone Construction Development INC #938018 · expires September 30, 2027 Uni Construction #1026926 · expires March 31, 2028 Unicorn Construction #1042772 · expires August 31, 2028 Urbanedge Construction INC #1145858 · expires November 30, 2027 V C Construction & Development #959583 · expires April 30, 2027 Velazquez Robert Construction #1072001 · expires December 31, 2026 Viviluxe Construction INC #1151920 · expires March 31, 2028 Walnut Housing Tech INC #1142816 · expires August 31, 2027 Wang Ziyi Construction #1145455 · expires October 31, 2027 Wkh Construction Service INC #1136117 · expires March 31, 2028 Xiating Chen #1155347 · expires May 31, 2028 Xinlongyuan Construction INC #1118997 · expires April 30, 2028 Yao Jifeng #945757 · expires April 30, 2028 Yin Construction Enterprises LLC #1128987 · expires November 30, 2026 Yu General Construction INC #1155644 · expires May 31, 2028 Yuen Yiu Ming #1142834 · expires August 31, 2027 Zhang Yuan #1042983 · expires August 31, 2028 Zheng Haojiang #966894 · expires October 31, 2027 Zhibin Su #1155412 · expires May 31, 2028 Zhou Liang #982880 · expires April 30, 2027 Electrical (C-10) 24 Adams Electric #448001 · expires October 31, 2027 Arow Electric #1129710 · expires November 30, 2026 Barron Electric #1104314 · expires May 31, 2027 Ca Sunshine Electrical #1133255 · expires February 28, 2027 Devin Electric #878672 · expires June 30, 2028 Electech #982409 · expires April 30, 2027 Enervision Electric Power LLC #1144854 · expires October 31, 2027 Gonzalez Electric #962683 · expires June 30, 2027 Ice Man Power LLC #1158034 · expires July 31, 2028 Integrated Wiring Concepts INC #1076152 · expires May 31, 2027 Jia Xiaolong #1149248 · expires January 31, 2028 Jing Y Electrical Services #1160291 · expires August 31, 2028 Liu Yin Ping #960083 · expires April 30, 2027 Lucas Electrical #888594 · expires December 31, 2026 Monarch Information Systems LLC #1007648 · expires February 28, 2027 Nielsen Electric #950973 · expires August 31, 2028 Post Electric Company INC #768204 · expires November 30, 2028 Qd Power INC #1157184 · expires June 30, 2028 Quark La Electrical #1112779 · expires November 30, 2027 Ray Bi Electrical & Energy LLC #1125153 · expires May 31, 2028 Ray Electrical Engineering INC #1039207 · expires May 31, 2028 Tsao Chyr-Shin Paul #670052 · expires April 30, 2027 Wh Electrical #1147623 · expires December 31, 2027 Xiaoqing #1113933 · expires December 31, 2027 Warm-air heating, ventilating and air-conditioning (C-20) 22 Ac Heat Diamond Bar #1145762 · expires October 31, 2027 Ace Rodil Heating and Air Conditioning #631042 · expires October 31, 2027 Allwayz Heating & Air Conditioning INC #1097372 · expires October 31, 2028 Atlantic Air Conditioning INC #613226 · expires March 31, 2027 Climate Specialists #1003654 · expires May 31, 2027 Four Seasons Air Conditioning and Heating #966880 · expires October 31, 2027 Gary's Ac Services #921063 · expires August 31, 2028 Honest Pro Air Conditioning and Heating #1106190 · expires June 30, 2027 Jh Advanced HVAC Solutions #1163754 · expires October 31, 2028 L B Air Conditioning #1072480 · expires January 31, 2027 Lanyi USA INC #1121762 · expires June 30, 2028 Likai Chen HVAC INC #926434 · expires December 31, 2027 Mac Refrigeration and Air Conditioning Co #580557 · expires November 30, 2027 Mcmaster Mechanical #879152 · expires February 28, 2027 Medrara HVAC #1042958 · expires August 31, 2028 Mr A/C #864636 · expires September 30, 2027 Plhk HVAC INC #1151997 · expires March 31, 2028 Qin HVAC #1161560 · expires September 30, 2028 Wu Chung Chieh #1105504 · expires June 30, 2027 Yq Air Condition Solution #1077548 · expires June 30, 2027 Yuze Air Conditioning #1086305 · expires January 31, 2028 Zy HVAC Equipment Services #1133374 · expires February 28, 2027 Plumbing (C-36) 10 Advanced Tankless and Plumbing #1121827 · expires June 30, 2028 All Day Drains #1088634 · expires March 31, 2028 Elite Pipe P #1144688 · expires October 31, 2027 Expedite Plumbing #939646 · expires October 31, 2027 G C Plumbing #681446 · expires December 31, 2027 Galvan Plumbing #1065435 · expires April 30, 2028 J H Plumbing #876263 · expires April 30, 2028 Jay's Plumbing #622850 · expires July 31, 2027 Jones Plumbing #917266 · expires June 30, 2028 Vanguard Plumbing #1161936 · expires September 30, 2028 Other license types 112 3 T Media INC Low voltage systems (C-7) · #987903 · expires October 31, 2027 A and L Systems Solutions Low voltage systems (C-7) · #966840 · expires February 29, 2028 A E D Contractors General engineering (A), General building (B) and 2 more · #441036 · expires March 31, 2028 Ace Iron Works Ornamental metal (C-23) · #539620 · expires August 31, 2028 Ace Plumbing Co General building (B), Plumbing (C-36) · #785570 · expires October 31, 2028 Airpropower Electrical (C-10), Warm-air heating, ventilating and air-conditioning (C-20) · #1150732 · expires February 29, 2028 All About T-Bar Insulation and acoustical (C-2) · #570421 · expires June 30, 2027 Amehs Windows & Glass Doors Glazing (C-17) · #1163528 · expires October 31, 2028 Aquarena Water Conditioning Water conditioning (C-55) · #1160847 · expires September 30, 2028 Arora Jay General building (B), Ceramic and mosaic tile (C-54) · #512179 · expires June 30, 2027 Avanti Membrane Technology INC Water conditioning (C-55) · #1091779 · expires May 31, 2028 Aveo INC General engineering (A), General building (B) and 3 more · #969881 · expires February 29, 2028 Beshear Floor Flooring and floor covering (C-15) · #1100076 · expires December 31, 2026 C - Thirty - Six INC General building (B), Plumbing (C-36) · #739644 · expires May 31, 2028 C M Innovate INC Ceramic and mosaic tile (C-54) · #992367 · expires April 30, 2028 Cal Steam Company Boiler, hot water heating and steam fitting (C-4), Warm-air heating, ventilating and air-conditioning (C-20) and 1 more · #674646 · expires April 30, 2027 Cany Fire Protection INC Fire protection (C-16), Plumbing (C-36) · #1142986 · expires September 30, 2027 Chien Ming Chu Chen General building (B), Electrical (C-10) and 1 more · #820540 · expires June 30, 2027 Ciel Air Conditioning and Electric Electrical (C-10), Warm-air heating, ventilating and air-conditioning (C-20) · #1039457 · expires May 31, 2028 Clifton Joe Tile Contractor INC Ceramic and mosaic tile (C-54) · #401939 · expires March 31, 2027 Colony On Green Landscaping (C-27) · #951899 · expires September 30, 2028 Cornerstone Construction Co General building (B), Drywall (C-9) · #427183 · expires August 31, 2028 Ct & T Concrete Paving INC General engineering (A), Concrete (C-8) and 1 more · #875627 · expires April 30, 2028 Daley Kenneth Heating & Air Services Warm-air heating, ventilating and air-conditioning (C-20), Plumbing (C-36) · #798187 · expires August 31, 2027 Dannys Installation of Appliances Limited specialty (D-34) · #984698 · expires June 30, 2027 Diamond Elevator Services Elevator (C-11) · #1021983 · expires December 31, 2026 Dk Air & Refrigeration Refrigeration (C-38) · #1123000 · expires June 30, 2028 Dream Space Construction General building (B), Painting and decorating (C-33) · #1071725 · expires December 31, 2026 Dux Technology Consulting INC Low voltage systems (C-7) · #1050592 · expires February 28, 2027 Dynamic Solar Electrical (C-10), Solar (C-46) · #1006299 · expires August 31, 2027 Echo Development INC General engineering (A) · #993395 · expires June 30, 2028 Edesh Construction General building (B), Electrical (C-10) and 1 more · #1020843 · expires November 30, 2026 Falkon Construction INC General engineering (A), General building (B) and 2 more · #911791 · expires March 31, 2028 Fedorow Michael Steven General building (B), Plumbing (C-36) · #652125 · expires October 31, 2027 Feng Haitao Low voltage systems (C-7) · #1061261 · expires December 31, 2027 Fill Good Landscaping Landscaping (C-27) · #1053396 · expires May 31, 2027 Forest & Sun Arborist Designers Landscapers Landscaping (C-27) · #893193 · expires March 31, 2027 Fueltec INC General engineering (A), HAZ · #1011678 · expires March 31, 2028 G A N Signs & Graphic INC Sign (C-45) · #1008442 · expires October 31, 2027 G N Y INC Low voltage systems (C-7) · #1033410 · expires November 30, 2027 Giant Palms Construction INC General building (B), Painting and decorating (C-33) · #1072035 · expires December 31, 2026 Grand Space General engineering (A), General building (B) · #1075915 · expires May 31, 2027 Green Air & Refrigeration Warm-air heating, ventilating and air-conditioning (C-20), Refrigeration (C-38) · #839148 · expires June 30, 2027 Green Point Landscaping (C-27) · #907419 · expires December 31, 2027 H J R Contracting INC General building (B), Warm-air heating, ventilating and air-conditioning (C-20) · #1041548 · expires July 31, 2028 Halstead Todd Michael General building (B), Electrical (C-10) · #685211 · expires March 31, 2028 Hammond Drywall Construction Insulation and acoustical (C-2), Drywall (C-9) · #956694 · expires January 31, 2027 Hardy Landscape Landscaping (C-27) · #734646 · expires March 31, 2027 Hardy Landscape Construction INC Landscaping (C-27) · #905954 · expires November 30, 2027 Henry's Custom Painting Painting and decorating (C-33) · #530987 · expires May 31, 2028 High Noon Air Warm-air heating, ventilating and air-conditioning (C-20), Refrigeration (C-38) · #1085441 · expires December 31, 2027 Hoffice Beautiful INC General building (B), Flooring and floor covering (C-15) · #965248 · expires September 30, 2027 I S Firepro Fire protection (C-16) · #740006 · expires September 30, 2027 Imperium Roofing INC Roofing (C-39) · #1141782 · expires August 31, 2027 Ion Security Systems Low voltage systems (C-7), Electrical (C-10) · #1015479 · expires June 30, 2028 Isre Interact Solutions Real Estate General engineering (A), General building (B) and 2 more · #1066181 · expires June 30, 2028 J R Q Finish Carpentry Residential remodeling (B-2), Cabinet, millwork and finish carpentry (C-6) · #972407 · expires October 31, 2027 Jad Marble Ceramic and mosaic tile (C-54) · #1046344 · expires October 31, 2028 K 3 G S LLC Low voltage systems (C-7) · #1064281 · expires March 31, 2028 K M K Glazing Contractors Glazing (C-17) · #917948 · expires June 30, 2028 Kertland Roofing INC General building (B), Roofing (C-39) · #510174 · expires May 31, 2027 Kitchen and Flooring Center INC General building (B), Ceramic and mosaic tile (C-54) · #968078 · expires December 31, 2027 Krubinski Sean General building (B), Painting and decorating (C-33) · #992919 · expires May 31, 2028 La Electrical & Construction INC General engineering (A), General building (B) and 1 more · #1119000 · expires April 30, 2028 Liao Hsueh Yu General building (B), Electrical (C-10) and 1 more · #769733 · expires October 31, 2027 Liberty Woodworking Cabinet, millwork and finish carpentry (C-6) · #903696 · expires September 30, 2027 Light Contracting Insulation and acoustical (C-2) · #1122793 · expires June 30, 2028 Lim Jae H Landscaping (C-27) · #721424 · expires April 30, 2028 M S T Construction General building (B), Electrical (C-10) · #837086 · expires February 28, 2027 M T Quality Construction General building (B), Painting and decorating (C-33) · #586957 · expires January 31, 2028 Maj Engineering General engineering (A) · #1089238 · expires March 31, 2028 Managa Raul Manuel General building (B), Warm-air heating, ventilating and air-conditioning (C-20) · #1005647 · expires July 31, 2027 Martin Dolores K Landscaping (C-27) · #430320 · expires October 31, 2028 Master Painting Co Painting and decorating (C-33) · #658145 · expires November 30, 2026 Mirae Construction Co General engineering (A), General building (B) and 1 more · #876472 · expires May 31, 2028 Monair Contractors General building (B), Electrical (C-10) and 1 more · #677543 · expires March 31, 2027 Monarch Deck Coatings Limited specialty (D-06) · #974168 · expires June 30, 2028 Myung Won I Kim Painting and decorating (C-33) · #1159753 · expires August 31, 2028 Oxford Painting Painting and decorating (C-33) · #580795 · expires May 31, 2028 Pachuca Construction General building (B), Masonry (C-29) · #1023592 · expires February 28, 2027 Padilla's Grading and Paving General building (B), Earthwork and paving (C-12) · #1093279 · expires June 30, 2028 Park John Limited specialty (D-35) · #961400 · expires May 31, 2027 Park S Roofing USA Roofing (C-39) · #1142782 · expires August 31, 2027 Perspective Landscaping INC General building (B), Landscaping (C-27) · #541581 · expires January 31, 2028 Petrie Custom Woodworks General building (B), Cabinet, millwork and finish carpentry (C-6) · #914575 · expires April 30, 2028 Place Construction & Development INC General engineering (A), ASB and 6 more · #515653 · expires March 31, 2027 Power Painting INC Painting and decorating (C-33) · #711007 · expires November 30, 2027 Professional Tile Installation Ceramic and mosaic tile (C-54) · #712185 · expires September 30, 2027 Pub Construction INC General engineering (A), General building (B) and 3 more · #788668 · expires December 31, 2026 Quality Contract Glazing Glazing (C-17) · #826550 · expires October 31, 2027 Regional Signs & Lighting Sign (C-45) · #1036143 · expires February 29, 2028 Roberts Richard Glen Jr Limited specialty (D-35) · #963131 · expires July 31, 2027 Rooter Shooter General building (B), Plumbing (C-36) and 1 more · #800418 · expires October 31, 2027 Service Wizards Warm-air heating, ventilating and air-conditioning (C-20), Plumbing (C-36) and 1 more · #797071 · expires July 31, 2027 Smart Construction General building (B), Electrical (C-10) · #1056267 · expires July 31, 2027 So Cal Hardwood Floors Flooring and floor covering (C-15) · #824420 · expires September 30, 2027 Suncoast Home Elevators Corp Elevator (C-11) · #1073048 · expires January 31, 2027 Sundial Concrete Constructors Concrete (C-8) · #1009010 · expires November 30, 2027 Sunshine Roofing INC Roofing (C-39) · #755126 · expires January 31, 2027 T H M Associates INC Low voltage systems (C-7) · #1052347 · expires April 30, 2027 Tasco Pacific Fire Protection Electrical (C-10), Fire protection (C-16) · #750602 · expires March 31, 2027 Tetra Tech Bas INC General engineering (A), Well drilling (C-57) and 1 more · #572017 · expires June 30, 2027 The Hot Mopper Roofing (C-39) · #978099 · expires May 31, 2028 Thlc Corporation General building (B), Electrical (C-10) and 3 more · #1077041 · expires June 30, 2027 Vanta Construction & Design General building (B), Electrical (C-10) · #1100647 · expires January 31, 2027 Vision Tree Experts INC Limited specialty (D-49) · #1004697 · expires June 30, 2027 Wang Hsu - Da General building (B), Cabinet, millwork and finish carpentry (C-6) · #712058 · expires August 31, 2027 Xpertcom Solutions INC Low voltage systems (C-7) · #844669 · expires August 31, 2028 Yellowstone Workx INC General building (B), Ceramic and mosaic tile (C-54) · #1084592 · expires December 31, 2027 Youngjin Steel INC Structural steel (C-51) · #1119273 · expires April 30, 2028 Zhuoxin Construction General building (B), Electrical (C-10) and 1 more · #1116182 · expires February 29, 2028 Zip Renovation & Air General building (B), Electrical (C-10) and 3 more · #762505 · expires May 31, 2027 Is your business on this list?
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Source: California Contractors State License Board's License Master file. CSLB's file covers licenses that are current, or expired but still renewable. Cancelled and revoked licenses aren't in it, so if you can't find someone, check the official search. Only licenses that are active in the file and list an address in
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