| Blue Mechanical Heating & Air Conditioning Corp | Lemuel Villalob Flores | — | (949) 310 1193 | HVAC | Mission Viejo · Orange County | — | — |
| Blue Moon Electrical | Blue Moon Electrical | — | (562) 372-6050 | Electricians | Orange · Orange County | — | — |
| Blue Objective INC | Matthew Christopher Stanley | — | (949) 636 7606 | GC, remodel, ADU | Mission Viejo · Orange County | — | — |
| Blue Ocean General Contractors INC | Kenny Wang | — | (714) 813 6266 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Blue Ocean Ornamental Iron | Blue Ocean Ornamental Iron | — | (949) 547 2574 | Other | San Juan Capistrano · Orange County | — | — |
| Blue Ocean Painting | Blue Ocean Painting | — | (951) 496 0369 | Windows, patio, painters | Irvine · Orange County | — | — |
| Blue Ocean Water Proofing | Blue Ocean Water Proofing | — | (714) 499 2001 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Blue Pacific Pools | Jeffrey Paul Solt | — | (949) 367 9710 | Windows, patio, painters | Mission Viejo · Orange County | — | — |
| Blue Professional Painting INC | Estrada Rene Vargas | — | (714) 852 8114 | Windows, patio, painters | Westminster · Orange County | — | — |
| Blue Python Construction INC | Scott Clifford Washburn | — | (714) 367 6241 | GC, remodel, ADU | Tustin · Orange County | — | — |
| Blue Signs & Mfg | Blue Signs & Mfg | — | (714) 724 1443 | Other | Westminster · Orange County | — | — |
| Blue Sky Environmental Consulting INC | Patrick Joseph Moffett | patmoffett@att.net | (714) 928 4008 | GC, remodel, ADU | Placentia · Orange County | — | — |
| Blue Sky Painting | Blue Sky Painting | — | (949) 307 4703 | Windows, patio, painters | Costa Mesa · Orange County | — | — |
| Blue Sky Plumbing & Filtration | Mario Thomas Messano | — | (714) 926 9636 | Other | Garden Grove · Orange County | — | — |
| Blue Star Painting | Hernandez Antonio Zavala | — | (714) 507 9052 | Windows, patio, painters | Anaheim · Orange County | — | — |
| Blue Star Pools | Blake Reynold Farris | — | (949) 375 8871 | GC, remodel, ADU | Newport Beach · Orange County | — | — |
| Blue Streak Electric INC | David Joshua Vasquez | — | (657) 610 9907 | Electricians | Orange · Orange County | — | — |
| Blue Top Grading & Paving | Blue Top Grading & Paving | — | (714) 862 6685 | Other | Cypress · Orange County | — | — |
| Blue Vision Construction INC | Ariana Ngoc Hai Nguyen | bluevisionconstructioninc@gmail.com | (657) 334 8888 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Blue Water | Blue Water | — | (949) 510 0177 | Other | San Juan Capistrano · Orange County | — | — |
| Blue Water Construction | Christian Randolph Hockmeyer | — | (714) 334 2344 | GC, remodel, ADU | San Juan Capistrano · Orange County | — | — |
| Blue Watt Construction | Wynne Jo Silvernagel | — | (714) 981 1150 | Electricians | Placentia · Orange County | — | — |
| Blue-line Contracting Services INC | Christopher Kurtis Johnson | — | (949) 933 0116 | GC, remodel, ADU | Aliso Viejo · Orange County | — | — |
| Bluebird Builders General Contracting | Michael Lance Pittman | — | (949) 842 2034 | GC, remodel, ADU | Laguna Woods · Orange County | — | — |
| Bluemel Construction | Charles William Bluemel | — | (562) 208 2623 | GC, remodel, ADU | Yorba Linda · Orange County | — | — |
| Blueprint Remodeling INC | Kevin Joe Stecher | — | (714) 515 9001 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| Blueray Management LLC | John Thomas Percy | — | (949) 887 5985 | Pool | Fountain Valley · Orange County | — | — |
| Blues Landscaping | Ramirez Ismael Casas | — | (562) 475 8782 | Windows, patio, painters | La Habra · Orange County | — | — |
| Bluestream Electrical LLC | Peng Hu | info@bluestreamelectrical.com | (949) 247 6159 | Electricians | Mission Viejo · Orange County | — | — |
| Bluewire Electric | Samuel Salvador Ochoa | jowens@bluewireelectric.com | (562) 286 3796 | Electricians | La Habra · Orange County | — | — |
| Blumar Development INC | Morena Del Carmen Hernandez Majano | — | (562) 318 6113 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| Bluu Construction INC | Bryan Minh Tri Luu | — | (714) 493 1576 | GC, remodel, ADU | Atwood · Orange County | — | — |
| Blyleven's Plumbing INC | Johannes Cornelius Blyleven | — | (714) 815 7502 | Other | Anaheim · Orange County | — | — |
| Bm Tile | Bm Tile | — | (714) 319 9692 | Other | Anaheim · Orange County | — | — |
| Bmc Electric | Miguel Angel Colon | bmcelectric1900@hotmail.com | (415) 756-5166 | Electricians | Huntington Beach · Orange County | — | — |
| Bml Construction INC | Brett James Wood | — | (562) 547 6831 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| Bms Construction INC | Michael Robert Smith | — | (213) 858 1008 | GC, remodel, ADU | San Clemente · Orange County | — | — |
| Bmv Electric INC | Balbino Moya Valdez | — | (714) 679 7466 | Electricians | Anaheim · Orange County | — | — |
| Bmw Builders | Bruce Martin Williams | — | (714) 745 5538 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| Bn Design Build INC | Benjamin Norouzi | — | (909) 257 7040 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |