| Burge Construction | Dan B Burge | — | (949) 492 1175 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Burgess Building | Burgess Building | — | (714) 258 6136 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Burgin Design Remodel INC | Bradley Michael Burgin | — | (714) 558 1094 | GC, remodel, ADU | Santa Ana · Orange County | — | — |
| Burk Allen INC | Krystal Dawn Allen | — | (714) 606 8876 | Other | Brea · Orange County | — | — |
| Burke Brand Construction INC | Leo Patrick Burke | — | (949) 226 7130 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| Burke Construction Builders INC | William Patrick Burke | — | (949) 289 4928 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Burke Electrical Contracting INC | Jordan Steven Burke | — | (949) 633 5990 | Electricians | Orange · Orange County | — | — |
| Burke Masonry Services INC | Burke Phillip Roble | — | (949) 940 3049 | Other | Santa Ana · Orange County | — | — |
| Burkhart Brother's Construction INC | Mark Earl Burkhart | — | (949) 375 6725 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Burl Refrigeration | Burl Refrigeration | — | (714) 231 7622 | HVAC | Garden Grove · Orange County | — | — |
| Burns & Mcdonnell West Engineering | Sean Patrick Kenny | — | (816) 333 9400 | GC, remodel, ADU | Brea · Orange County | — | — |
| Burns Framing INC | Michael Robert Burns | — | (714) 714 0013 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Burridge Air | Burridge Air | — | (949) 322 9325 | HVAC | Huntington Beach · Orange County | — | — |
| Burrito Tile & Stone | Romero Benjamin Dominguez | — | (714) 381 7204 | Other | Anaheim · Orange County | — | — |
| Burton's Electric INC | Thomas Vincent Burton | burtonselectric@yahoo.com | (714) 435 9124 | Electricians | Costa Mesa · Orange County | — | — |
| Buru Plumbing | Ernesto Manuel Bonilla Leon | — | (714) 463 0415 | Other | Orange · Orange County | — | — |
| Bushala Brothers INC | George Kahlil Jr Bushala | — | (714) 526 1242 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Busy Bee Construction Solution INC | Avisov Dror | — | (310) 850 0406 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Butier Engineering INC | Mark Michael Jr Butier | — | (714) 832 7222 | Other | Tustin · Orange County | — | — |
| Butler Construction | Jeffrey Lee Butler | interested@domainmarket.com | (949) 292 4241 | GC, remodel, ADU | Placentia · Orange County | — | — |
| Butron Roofing | Roman Noe Ruiz Butron | — | (831) 320 8634 | Other roofers | Anaheim · Orange County | — | — |
| Butterfly Dwellings INC | Mark Neil Rapparport | — | (949) 275 3915 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Buu Quoc Hang | Buu Quoc Hang | — | (714) 928 8929 | Electricians | Fullerton · Orange County | — | — |
| Buwalda Construction Company INC | Vernon Bruce Buwalda | — | (949) 230 5336 | GC, remodel, ADU | Laguna Niguel · Orange County | — | — |
| Bvm INC | Brent Alan Vander Mooren | — | (714) 319 3921 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Byco INC | Mark Randolph Byers | — | (949) 645 2251 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Bycon | Mark Randolph Byers | — | (949) 645 2251 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| Bykone INC | Byung Kyu Lim | — | (714) 643 4261 | Other | Tustin · Orange County | — | — |
| Bynum And Associates Corporation | James Lee Bynum | — | (949) 653 8300 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Bynum Construction INC | James Lee Bynum | — | (949) 653 8300 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Byrdy Landscape Management | Byrdy Landscape Management | — | (714) 679 4644 | Windows, patio, painters | Irvine · Orange County | — | — |
| Byrnes Communication LLC | Kevin James Byrnes | — | (714) 369 9921 | Other | Huntington Beach · Orange County | — | — |
| Byrnes Electrical | Jeremy Robert Byrnes | — | (714) 794 8424 | Electricians | Huntington Beach · Orange County | — | — |
| Byron Chigua-ventura | Byron Chigua-ventura | — | (714) 470 3449 | Other | Orange · Orange County | — | — |
| Byron Epp INC | Byron John Epp | — | (949) 215 2212 | Other | Mission Viejo · Orange County | — | — |
| Byron Medrano | Byron Medrano | — | (949) 870 2785 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| C & C Construction Services INC | Todd Ryan Cottle | — | (714) 288 7600 | GC, remodel, ADU | Tustin · Orange County | — | — |
| C & C Homes INC | Justin Richard Capizzi | — | (714) 725 8585 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| C & C Swimming Pool Service | Sung Baek Kim | — | (714) 251 8244 | Pool | Garden Grove · Orange County | — | — |
| C & Construction | Rhee Joanne | — | (213) 820 1233 | GC, remodel, ADU | Fullerton · Orange County | — | — |