| B K Electrical Solutions INC | Arteaga Luis Marin | — | (714) 421 0872 | Electricians | Garden Grove · Orange County | — | — |
| B K Painting | B K Painting | — | (714) 321 7083 | Windows, patio, painters | Cypress · Orange County | — | — |
| B K Tile | B K Tile | — | (714) 960 0260 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| B Kramer INC | Bruce Michael Kramer | — | (800) 600 3047 | GC, remodel, ADU | Westminster · Orange County | — | — |
| B L Electricals INC | Bhadrakumar Lalji Pahu | sales@blelectricals.com | (714) 814 3652 | Electricians | Yorba Linda · Orange County | — | — |
| B Modern Construction & Electrical | Bidram Babak | — | (714) 603 1091 | Electricians | Mission Viejo · Orange County | — | — |
| B P Builders INC | Bryan Neal Pendleton | — | (714) 655 4512 | Other | Westminster · Orange County | — | — |
| B P Construction | William John Pugelli | — | (714) 330 2160 | GC, remodel, ADU | Orange · Orange County | — | — |
| B P H Construction INC | Kimberli Anne Tice | — | (949) 230 2546 | GC, remodel, ADU | Laguna Hills · Orange County | — | — |
| B P Tractor Service INC | Brian Craig Provence | — | (949) 939 9944 | Other | San Clemente · Orange County | — | — |
| B R Anderson Electric | Barry Reginald Anderson | — | (562) 493 4800 | Electricians | Los Alamitos · Orange County | — | — |
| B R Frost Company | Bruce Rodney Frost | — | (714) 381 2893 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| B R Kellogg Waterproofing | B R Kellogg Waterproofing | — | (949) 637 4175 | Windows, patio, painters | Capistrano Beach · Orange County | — | — |
| B R S Painting & Construction INC | Lee Dohack | — | (626) 643 2264 | GC, remodel, ADU | Cypress · Orange County | — | — |
| B Roeland Construction INC | Bruce James Roeland | — | (714) 272 7832 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| B T O Electric | Brian Michael O'donnell | — | (714) 658 5047 | Electricians | Orange · Orange County | — | — |
| B T V INC | Paul Phong Voong | — | (714) 716 6870 | GC, remodel, ADU | Garden Grove · Orange County | — | — |
| B W Tile And Sons INC | Bryan Christopher Witte | — | (949) 230 9521 | Other | Costa Mesa · Orange County | — | — |
| B Z Electric | Raymond Bret Zschomler | — | (714) 585 5504 | Electricians | Huntington Beach · Orange County | — | — |
| B&c Custom Fencing | Barry Perez | — | (310) 654 9715 | Other | Buena Park · Orange County | — | — |
| B&g Bros Remodeling | Moran Juan Baizano | — | (714) 798 1600 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| B&m Window Coverings | Changyong Deng | — | (949) 491 4643 | Other | Irvine · Orange County | — | — |
| B&r Builders LLC | Babak Ghaznavi | — | (949) 899 3329 | GC, remodel, ADU | Irvine · Orange County | — | — |
| B-construction | Ciklic Bozidar | — | (818) 205 8627 | GC, remodel, ADU | Costa Mesa · Orange County | — | — |
| B-ocean Construction INC | Inho Yang | — | (213) 999 9679 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| B2 Plumbing | B2 Plumbing | — | (714) 642 7169 | Other | Huntington Beach · Orange County | — | — |
| Baabak Sharifan DBA Tsc Construction | Baabak Bobby Sharifan | — | (949) 584 0920 | GC, remodel, ADU | Monarch Beach · Orange County | — | — |
| Baak Development INC | Derek Geoffrey Baak | — | (310) 494 6622 | GC, remodel, ADU | Huntington Beach · Orange County | — | — |
| Babak Ghaznavi | Babak Ghaznavi | — | (949) 856 0090 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Babbs Renovations | Babbs Renovations | babbsrenovations@gmail.com | (562) 661 7373 | GC, remodel, ADU | Los Alamitos · Orange County | — | — |
| Babcock Finishes | Babcock Finishes | — | (714) 403 7000 | Windows, patio, painters | Huntington Beach · Orange County | — | — |
| Baccaro Construction Co INC | Peter Thomas Baccaro | — | (714) 870 8051 | Electricians | Fullerton · Orange County | — | — |
| Bachar Hamouda | Bachar Hamouda | — | (949) 878 1291 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Bachar Koujah | Bachar Koujah | — | (909) 772 6403 | GC, remodel, ADU | Irvine · Orange County | — | — |
| Back Bay Flooring & Tile | Shawn Gordon Backus | — | (714) 717 6432 | Other | Fullerton · Orange County | — | — |
| Backbay Custom Pools | Backbay Custom Pools | — | (949) 412 0447 | Pool | Costa Mesa · Orange County | — | — |
| Backs Construction | Garrett Allen Backs | — | (714) 267 8902 | GC, remodel, ADU | Dana Point · Orange County | — | — |
| Backyard Golf & Games INC | Christopher Lee Johnson | — | (714) 556 1195 | Windows, patio, painters | Irvine · Orange County | — | — |
| Backyard Patio Covers And Awning | Backyard Patio Covers And Awning | — | (949) 506 0990 | Other | Santa Ana · Orange County | — | — |
| Bader Home Construction Management LLC | Michael Edward Bader | — | (949) 395 9461 | GC, remodel, ADU | Ladera Ranch · Orange County | — | — |