| Big Jm Electric INC | Michael J Ruiz | — | (909) 230 8080 | Electricians | Montclair · San Bernardino County | — | — |
| Big John's Flooring | John Edward Iii Ericks | — | (773) 331 6600 | Other | Chino Hills · San Bernardino County | — | — |
| Big Johnson's Concrete & Pumping INC | Kevin Michael Johnson | — | (909) 917 5386 | Other | San Bernardino · San Bernardino County | — | — |
| Big Mike's Rooter & Plumbing INC | Jimilee E Allen | — | (909) 888 8736 | Other | Yucaipa · San Bernardino County | — | — |
| Big Mountain | Timothy Song Suk Yang | — | (951) 232 9636 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Big O Flooring INC | Fernando Madrid | — | (909) 757 2024 | Other | Ontario · San Bernardino County | — | — |
| Big Red Construction | Richard Allen Feenstra | — | (909) 712 9972 | GC, remodel, ADU | Redlands · San Bernardino County | — | — |
| Big Sky Electric / Filanc A Joint Venture | Sky Electric INC Big | — | (909) 694 0432 | Electricians | Upland · San Bernardino County | — | — |
| Big Sky Electric INC | Christopher Scott Livingston | — | (909) 694 0432 | Electricians | Upland · San Bernardino County | — | — |
| Big Worm Water Well Drilling | Ernesto Cobian | — | (909) 268 7298 | Other | Ontario · San Bernardino County | — | — |
| Bill Cullen Drywall | Bill Cullen Drywall | — | (909) 645 9600 | Other | Crestline · San Bernardino County | — | — |
| Bill Helfer Plumbing | Bill Helfer Plumbing | — | (949) 279 0264 | GC, remodel, ADU | Big River · San Bernardino County | — | — |
| Bill Kawa Construction | Brandon W Kawa | — | (909) 866 7378 | GC, remodel, ADU | Big Bear Lake · San Bernardino County | — | — |
| Bill Lee Electric | William Byram Jr Lee | — | (760) 219 9228 | Electricians | Yucca Valley · San Bernardino County | — | — |
| Bill Marino | Bill Marino | — | (951) 255 7003 | Other roofers | Ontario · San Bernardino County | — | — |
| Bill Van Dyke | Bill Van Dyke | — | (818) 269 2621 | Windows, patio, painters | Sugarloaf · San Bernardino County | — | — |
| Bill Wood Lathing | Bill Wood Lathing | — | (909) 628 1733 | Other | Chino · San Bernardino County | — | — |
| Bill's Heating & Air Conditioning | Bill's Heating & Air Conditioning | — | (909) 980 4069 | HVAC | Rancho Cucamonga · San Bernardino County | — | — |
| Billings Grading And Earthworks LLC | Robert Gene Billings | — | (760) 910 4425 | Other | Yucca Valley · San Bernardino County | — | — |
| Billy J Blakeman Construction | Billy Jo Blakeman | — | (909) 273 0506 | GC, remodel, ADU | Crestline · San Bernardino County | — | — |
| Bin Li | Bin Li | — | (626) 559 7179 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Bird Tree Building Co | Jonathan Quentin Thayer | — | (760) 424 2621 | GC, remodel, ADU | Yucca Valley · San Bernardino County | — | — |
| Bishop Construction Services INC | Matthew Stephan Le Vesque | — | (951) 830 4918 | Electricians | Yucaipa · San Bernardino County | — | — |
| Bishop's Painting | Bishop's Painting | — | (626) 482 4678 | Windows, patio, painters | Apple Valley · San Bernardino County | — | — |
| Bithell INC | Troy Gordon Bithell | — | (626) 331 2292 | Windows, patio, painters | Fontana · San Bernardino County | — | — |
| Black & Bronze Paint INC | Hugo Daniel Fernandez Lopez | — | (909) 340 4568 | Windows, patio, painters | San Bernardino · San Bernardino County | — | — |
| Black Coffee Sign Fabricators | Dale Curtis Foley | — | (909) 974 4499 | Other | San Bernardino · San Bernardino County | — | — |
| Black Diamond Construction | Bill Alan| Garton Bill Alan Jr Garton | — | (858) 414 1679 | GC, remodel, ADU | Lake Arrowhead · San Bernardino County | — | — |
| Black Hawk Carpentry Services | Nicholas Joseph Contini | — | (909) 223 0477 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Black Horse Painting | Manuel Anguiano | info@blackhorsepainting.com | (951) 518 8404 | Windows, patio, painters | Rialto · San Bernardino County | — | — |
| Black Mammoth Concrete INC | Abraham Lopez | — | (909) 708 6142 | Other | San Bernardino · San Bernardino County | — | — |
| Black Ops Plastering INC | Thurman Edward Taylor | — | (714) 653-3738 | Other | Redlands · San Bernardino County | — | — |
| Black Sheep Construction | Sanchez Armando | — | (909) 520 5848 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Black Tie Exterminator | Black Tie Exterminator | — | (951) 907-2336 | Pest, tile roofs | San Bernardino · San Bernardino County | — | — |
| Black Wing | Black Wing | store@blackwing.com | (323) 494 7794 | HVAC | Rialto · San Bernardino County | — | — |
| Black's Shutters Shades & Blinds LLC | Mark Ryan Ii Black | — | (714) 913 8463 | Other | Johnson Valley · San Bernardino County | — | — |
| Blackbelt Construction & Inspection Services | Ernesto Jr Vasquez | — | (951) 232 3653 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Blackbird Construction INC | Tom P Panos | — | (323) 839 1689 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| Blackburn Creations | Blackburn Creations | — | (951) 204 7431 | GC, remodel, ADU | Yucaipa · San Bernardino County | — | — |
| Blacked Out Shower Pans | Blacked Out Shower Pans | — | (562) 417 4600 | Other | Phelan · San Bernardino County | — | — |