| B & C Welding & Iron Works | Byeong Hee Lee | — | (714) 636 5486 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| B & D Infrastructure Solutions LLC | William Austin Dickey | — | (949) 842 0088 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| B & G Automated INC | Thomas Michael Fischer | contact@sansoxygen.com | (714) 861 4426 | Electricians | Fountain Valley · Orange County | — | — |
| B & J Tree Service | Bobby Levell Jr Gilbert | — | (714) 991 4160 | Windows, patio, painters | Tustin · Orange County | — | — |
| B & M Cabinets | Bradley Arland Dyer | — | (714) 928 8809 | Other | Anaheim · Orange County | — | — |
| B & M Custom Glass And Mirror INC | Kevin Reed Cue | — | (310) 227 8020 | Windows, patio, painters | Los Alamitos · Orange County | — | — |
| B & M INC | Byoung Soo Kim | — | (714) 308 8574 | GC, remodel, ADU | Tustin · Orange County | — | — |
| B & P Services INC | Russell Edward Buschmann | — | (949) 833 1041 | HVAC | Costa Mesa · Orange County | — | — |
| B & W Custom Restaurant Equipment INC | Nathan Eugene Bojorquez | — | (714) 578 0332 | Other | La Habra · Orange County | — | — |
| B & W LLC | Phillip Kurt Wirthgen | — | (714) 941 9796 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| B & W Plumbing | B & W Plumbing | — | (714) 396 7711 | Other | Huntington Beach · Orange County | — | — |
| B - 4 Construction Services INC | Bryan Keith Chaddick | — | (714) 322 4289 | GC, remodel, ADU | Dove Canyon · Orange County | — | — |
| B A P K O Metal INC | Michael Ray Brubaker | — | (714) 639 9380 | GC, remodel, ADU | Orange · Orange County | — | — |
| B And S Landscape INC | Castro Bernardino | — | (714) 537 7386 | Windows, patio, painters | Garden Grove · Orange County | — | — |
| B B Electric | Robert Khoi Bui | — | (714) 478 2678 | Electricians | Fountain Valley · Orange County | — | — |
| B B HVAC | B B HVAC | customerservice@bbhvac.com | (714) 264 7751 | HVAC | Lake Forest · Orange County | — | — |
| B B Painting & Maintenance | B B Painting & Maintenance | — | (714) 920 5590 | Windows, patio, painters | Anaheim · Orange County | — | — |
| B Bailey | B Bailey | — | (949) 614 6481 | GC, remodel, ADU | Westminster · Orange County | — | — |
| B C Electric | Mark Gerard Bilbia | — | (714) 335 4089 | Electricians | Cypress · Orange County | — | — |
| B C Elite | B C Elite | — | (949) 374 3572 | Electricians | Aliso Viejo · Orange County | — | — |
| B C Flooring INC | Kenneth John Radzai | — | (714) 901 4711 | Other | Huntington Beach · Orange County | — | — |
| B C M Boehling Construction Management | Kenneth John Boehling | — | (949) 307 7671 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| B C M Builders | B C M Builders | — | (949) 400 7823 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| B C M Construction | Brian Christopher Marmaud | — | (714) 420 3123 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| B C M Tile & Stone Co | Brian Christopher Matthews | — | (949) 443 1488 | Other | Dana Point · Orange County | — | — |
| B C S Consultants INC | Afsaneh Rajab | — | (949) 333 1007 | Other | Irvine · Orange County | — | — |
| B D B Incorporated | Timothy Andrew Mayland | — | (714) 530 8150 | Electricians | Garden Grove · Orange County | — | — |
| B E C Complete Plumbing Services INC | William Paul Cattaneo | — | (714) 404 2944 | Other | Laguna Niguel · Orange County | — | — |
| B Eilers Designs | B Eilers Designs | — | (949) 378 1072 | Other | Foothill Ranch · Orange County | — | — |
| B F Construction INC | Brandon Lee Fiege | — | (866) 607 2046 | Electricians | Westminster · Orange County | — | — |
| B F Development | B F Development | — | (714) 747 5988 | GC, remodel, ADU | Irvine · Orange County | — | — |
| B F Landscape Services | Ben Akihiko Fukubayashi | — | (714) 412 3114 | Windows, patio, painters | Orange · Orange County | — | — |
| B Foster Construction INC | Brian Foster | — | (949) 716 2693 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| B G S Performance Construction | Brett Gregory Stern | — | (714) 376 2685 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| B Green Air | B Green Air | — | (562) 244 5620 | HVAC | Buena Park · Orange County | — | — |
| B H Design INC DBA B H Design Construction | Seong Ho Ahn | — | (213) 880 0411 | GC, remodel, ADU | Buena Park · Orange County | — | — |
| B J S Construction | Brian John Szczurko | — | (714) 288 1341 | Electricians | Orange · Orange County | — | — |
| B J Scott & Associates INC | Bradley James Scott | — | (714) 779 8886 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| B J's Construction | Brian Al Jarrah | — | (310) 424 9622 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| B Joseph Interiors | B Joseph Interiors | — | (714) 526 3019 | Windows, patio, painters | Fullerton · Orange County | — | — |