| Baolo P & C INC | Hwa Sook Woo | — | (714) 371 5080 | GC, remodel, ADU | La Habra · Orange County | — | — |
| Bapptre Landscaping INC DBA Shine Illumination | Bruce Douglas Brenon | — | (949) 480 1599 | Windows, patio, painters | San Juan Capistrano · Orange County | — | — |
| Barajas Plumbing | Barajas Plumbing | — | (714) 931 6486 | Other | Anaheim · Orange County | — | — |
| Barbosa Iron Works | Ricardo Guadalupe Barbosa | — | (562) 632 7434 | Other | Buena Park · Orange County | — | — |
| Barclay Butera General Construction | Barclay Ball Butera | — | (714) 625 1229 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Bare Wire Networks Corp | Michael Dominick Martin | — | (877) 910 4010 | Other | Laguna Niguel · Orange County | — | — |
| Bargain Construction Services | Alemozaffar Sirus | — | (909) 260 0505 | HVAC | Irvine · Orange County | — | — |
| Barger Custom Homes LLC | Beth Ann Barger | — | (714) 272 6494 | GC, remodel, ADU | Orange · Orange County | — | — |
| Barker And Sons Plumbing INC | Michael Anthony Barker | — | (714) 693 8766 | Other | Orange · Orange County | — | — |
| Barker Carpentry INC | Joshua Richard Barker | info@barkercarpentry.com | (562) 787 5775 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Barkshire Laser Leveling INC | William John Barkshire | — | (949) 240 8779 | Windows, patio, painters | San Clemente · Orange County | — | — |
| Barnard Glass & Mirror | Barnard Glass & Mirror | — | (949) 642 3601 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| Barnett Roofing LLC | Chris Alan Barnett | — | (714) 724 1938 | Other roofers | Anaheim · Orange County | — | — |
| Barnyard Specialties LLC | Micah James Davis | team@latofonts.com | (949) 292 3527 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Barojas Electric INC | Vazquez Roberto Barojas | — | (657) 252 7665 | Electricians | Buena Park · Orange County | — | — |
| Baron Construction | Joseph Paul Baron | — | (949) 390 4115 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Baron's Refrigeration Mechanical | Baron's Refrigeration Mechanical | — | (714) 770 9635 | HVAC | La Habra · Orange County | — | — |
| Barragan Builders LLC | Heidi Garcia Barragan | — | (949) 355 7041 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Barragan Construction & Design | Barragan Rafael | — | (949) 677 8473 | GC, remodel, ADU | Lake Forest · Orange County | — | — |
| Barragan Construction And Restoration INC | Barragan Gerardo | — | (714) 673 7150 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Barragan Woodworking LLC | Oscar Juarez Barragan | — | (714) 334 7060 | Other | Fullerton · Orange County | — | — |
| Barras Plumbing | Barras Plumbing | — | (714) 328 1709 | Other | Fountain Valley · Orange County | — | — |
| Barrera Family Electricians | Barrera Family Electricians | — | (657) 332-2392 | Electricians | Cypress · Orange County | — | — |
| Barrett & Crawford Development Corp | Anthony John Crawford | — | (844) 367 1040 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Barrett Construction | Clayton Holden Barrett | — | (714) 742 5106 | GC, remodel, ADU | Orange · Orange County | — | — |
| Barrington Custom Hardwood Flooring | Barrington Custom Hardwood Flooring | — | (714) 931 2529 | Other | Yorba Linda · Orange County | — | — |
| Barrio Electric INC DBA Barrio Contracting | Omar Valdovinos Oregon | — | (714) 206 2186 | Electricians | Santa Ana · Orange County | — | — |
| Barron Roofing INC | Serrato-cisneros Liliana | — | (714) 514 8759 | Other roofers | La Habra · Orange County | — | — |
| Barry M Saywitz | Barry M Saywitz | — | (949) 930 7502 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Barry O Whitson | Barry O Whitson | — | (714) 423 8230 | Other | Anaheim · Orange County | — | — |
| Barry's Repair Service | William Barry Jr Lovell | — | (626) 965 9393 | Electricians | Dana Point · Orange County | — | — |
| Barta Construction | Barta Andrew | — | (949) 533 9252 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Bartczak Cabinets And Crown | Bartczak Cabinets And Crown | — | (714) 851 4466 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Bartley Corrigan | Bartley Corrigan | — | (310) 591 9129 | Other roofers | Fullerton · Orange County | — | — |
| Bartolo Window Treatment Designs INC | John Anthony Bartolo | — | (949) 733 8959 | Other | Irvine · Orange County | — | — |
| Barton Coastal Homes INC | Curtis Scott Barton | curtis@bartoncoastalhomes.com | (949) 670 6735 | GC, remodel, ADU | Ladera Ranch · Orange County | — | — |
| Barton Coatings | Barton Coatings | — | (714) 240 1944 | Other | Costa Mesa · Orange County | — | — |
| Barton Electric | Donald Anthony Jr Parco | — | (866) 922 7866 | Electricians | Irvine · Orange County | — | — |
| Bartwood Construction INC | Ashish Bipin Tolia | — | (714) 965 7900 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Barwick Construction | William H Barwick | — | (949) 363 1043 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |