| Barz Landscaping | Barz Landscaping | — | (714) 335 0692 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Base Construction INC | Mehraban Yazdani Buicki | — | (949) 387 3471 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Base Structural INC | Don Richard Golden | info@basestructural.com | (949) 627 6009 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Baseline Construction | Oliver Joseph Vasquez | — | (714) 345 1730 | GC, remodel, ADU | Orange · Orange County | — | — |
| Bashhaus LLC | Matthew Joseph Bashor | — | (714) 930 7455 | Other | Fullerton · Orange County | — | — |
| Basic Air INC | Hozanna Mary Megerdichian | — | (714) 546 2445 | HVAC | Costa Mesa · Orange County | — | — |
| Bass And Sons Plumbing Company | Benjamin Charles Bass | — | (714) 534 5403 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Bassett Building INC | Terry Ray Bassett | — | (949) 933 9785 | GC, remodel, ADU | Orange · Orange County | — | — |
| Bassi Design & Construction Corporation | John Abbasi | — | (949) 533 8845 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Bastanchury Plumbing | Bastanchury Plumbing | — | (714) 529 1701 | Other | Brea · Orange County | — | — |
| Bat Jac Glass INC | Matthew Jay Burge | — | (714) 554 6101 | Windows, patio, painters | Santa Ana · Orange County | — | — |
| Bates Construction | Robert Francis Jr Bates | — | (714) 898 3185 | Other | Huntington Beach · Orange County | — | — |
| Bates Development INC | Troy Carlton Bates | — | (714) 813 8308 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Bath Kitchen Renew Construction | Yuan Yangdar | — | (714) 850 4660 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Battres Builders | Israel Battres | — | (714) 759 0709 | GC, remodel, ADU | Fountain Valley · Orange County | — | — |
| Battres Construction | Battres Israel | — | (714) 754 0709 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Bauer Construction Co | Mark Ross Bauer | — | (949) 370 0386 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Bauhs Carpets INC DBA B & B Carpets & Flooring | Robert Gordon Bernard | — | (562) 428 7589 | Other | Cypress · Orange County | — | — |
| Bautista Masonry | Bautista Masonry | — | (714) 759 6651 | Other | Placentia · Orange County | — | — |
| Bav Construction & Real Estate | Bavafa Mehdi | — | (949) 668 4787 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Bay Shore Electric INC | Charolette Louise Behling | — | (949) 645 9341 | Electricians | Dana Point · Orange County | — | — |
| Bayer HVAC INC | Stephen John Bayer | bayerhvac@bayerhvac.com | (714) 655 6530 | HVAC | Huntington Beach · Orange County | — | — |
| Baylor Construction LLC | Chadwick Baylor Johnson | — | (541) 213 1269 | GC, remodel, ADU | Seal Beach · Orange County | — | — |
| Bayne Electrical Company | Matthew Jacob Bayne | — | (949) 300 7450 | Electricians | Irvine · Orange County | — | — |
| Bayoo Construction Services | Ehab Mohamed Saye Bayoumi | — | (714) 713 7113 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Bayrich Construction INC | Dell Philip Bailey | bayrich81@aol.com | (714) 578 5760 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Baysals INC | Levent Baysal | — | (415) 623 5150 | Other | Aliso Viejo · Orange County | — | — |
| Bayshore Builders | Bayshore Builders | — | (949) 573 5258 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Bayshore Tech INC | Arthur Lawrence Conriquez | — | (714) 935 0327 | Other | Anaheim · Orange County | — | — |
| Bayside Building Services | Paul Conrad Jr Lindemeyer | — | (714) 632 3500 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Bayside Lath & Plaster INC | Robin James Cox | — | (714) 362 7042 | Other | Westminster · Orange County | — | — |
| Bayside Low Voltage | Steven Glen Harmond | — | (949) 400 7047 | Other | Costa Mesa · Orange County | — | — |
| Bayside National Home Improvement | Mora Ricardo Ruiz | — | (949) 413 7476 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Bayside Painting Unlimited INC | Gregory Thomas Harold | — | (949) 233 8665 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| Bayside Pool Maintenance | Bayside Pool Maintenance | — | (949) 933 4756 | Pool | Dana Point · Orange County | — | — |
| Bayside Window Cleaning INC | Laurence Earl Waldron | — | (949) 215 2323 | Other | Laguna Hills · Orange County | — | — |
| Baystate Plumbing | Baystate Plumbing | — | (949) 861 1129 | Other | Dana Point · Orange County | — | — |
| Bbh Construction | Paul Robert Hanson | — | (833) 293 4687 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Bbk Electric | Bill Sung Kim | sales@bbkelectric.co.th | (714) 721 2173 | Electricians | Cypress · Orange County | — | — |
| Bbpn Construction | Roy Hoang Gia Nguyen | — | (714) 200 3388 | GC, remodel, ADU | Garden Grove · Orange County | — | — |