| Baja Reinforcing INC | Francisco Javier Casillas | — | (562) 676 1881 | Other | Bloomington · San Bernardino County | — | — |
| Baker Air | Baker Air | — | (909) 275 2818 | HVAC | Rialto · San Bernardino County | — | — |
| Baker Construction | Heather Ann Thomas Baker | mcgahae@bakerconstruction.com | (909) 501 6756 | GC, remodel, ADU | Mentone · San Bernardino County | — | — |
| Baker Systems INC | Matthew Joseph Baker | info@bakersystems.net | (909) 985 5504 | Electricians | Upland · San Bernardino County | — | — |
| Bakers Heating And Air Conditioning | Bakers Heating And Air Conditioning | — | (310) 686 6215 | HVAC | Upland · San Bernardino County | — | — |
| Balderrama Construction | Johnny Matthew Balderrama | — | (714) 470 8235 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Baldridge Glazing Co | Michael Benjamin Baldridge | — | (909) 792 0612 | Windows, patio, painters | Running Springs · San Bernardino County | — | — |
| Baldwin Construction | Petrov John | — | (909) 592 2292 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Baldy Electric INC | Ryan Steven Mehas | info@baldyelectric.com | (909) 980 2024 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| Baldy Fire & Safety INC | Jesse Lee Engleman | — | (909) 476 6655 | Electricians | Alta Loma · San Bernardino County | — | — |
| Baldy Utility Company INC | Ryan Steven Mehas | info@baldyutility.com | (909) 921 6314 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| Ballard Homes INC | Richard Michael Ballard | — | (951) 757 7013 | GC, remodel, ADU | Grand Terrace · San Bernardino County | — | — |
| Ballard Plumbing Heating & Air Conditioning | Ballard Plumbing Heating & Air Conditioning | — | (909) 297-1914 | HVAC | San Bernardino · San Bernardino County | — | — |
| Ballard Services INC DBA Ballard Plumbing Heating And Air | Michael David Montano | — | (909) 882 1748 | HVAC | San Bernardino · San Bernardino County | — | — |
| Ballesteros Construction | Baylee Ann Ballesteros | cballesteros1981@gmail.com | (414) 698-9357 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Ballinger Developments | Ballinger Developments | — | (760) 831 5086 | GC, remodel, ADU | Yucca Valley · San Bernardino County | — | — |
| Ballz Construction | Truitt Lee Ball | — | (760) 403 3675 | GC, remodel, ADU | Phelan · San Bernardino County | — | — |
| Balto Development INC | David Barry Boorstein | — | (909) 240 9615 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Banderas Plumbing LLC | Nayely Berenice Zamora | — | (909) 771 7464 | Other | Highland · San Bernardino County | — | — |
| Bar - H Well Drilling INC | Daniel Wesley Shaw | — | (760) 912 5075 | Other | Lucerne Valley · San Bernardino County | — | — |
| Bar General Building INC | Brandon Abel Romo | — | (909) 694 7705 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Baraa Thamir Yassin | Baraa Thamir Yassin | — | (909) 991 4957 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Barackman And Son's Construction | David Eugene Ii Barackman | — | (760) 713 7808 | GC, remodel, ADU | Oak Hills · San Bernardino County | — | — |
| Barahona Company INC DBA Three D Cabinetry | David Ricardo Barahona | — | (909) 946 9676 | Other | Upland · San Bernardino County | — | — |
| Barajas Leon Landscaping | Jose Barajas | — | (909) 763 1338 | Windows, patio, painters | San Bernardino · San Bernardino County | — | — |
| Barato Mandujano's Team | Hernandez Enrique Mandujano | — | (909) 609 0381 | GC, remodel, ADU | Apple Valley · San Bernardino County | — | — |
| Barbee Plastering | Barbee Plastering | — | (909) 720 2395 | Other | Victorville · San Bernardino County | — | — |
| Barkley Andross Corp | Gerod Tye Andross | — | (760) 244 4311 | Electricians | Hesperia · San Bernardino County | — | — |
| Barkley Plumbing | Barkley Plumbing | — | (909) 337 4596 | Other | Lake Arrowhead · San Bernardino County | — | — |
| Barnes Fiber Communications | Barnes Fiber Communications | — | (951) 544 9073 | Other | Ontario · San Bernardino County | — | — |
| Baron Pool Plastering Of Southern California INC | Luis Pierre Marquez | info@baronpool.com | (909) 792 8891 | Pool | San Bernardino · San Bernardino County | — | — |
| Barons Heating & Air | Barons Heating & Air | — | (909) 469 1360 | HVAC | Upland · San Bernardino County | — | — |
| Barragan's Plastering INC | Miguel Angel Barragan Cabezas | — | (626) 209 7321 | Other | Phelan · San Bernardino County | — | — |
| Barraza Enterprises INC | Rigo Barraza | — | (909) 278 1689 | Other | Loma Linda · San Bernardino County | — | — |
| Barre Mormann Construction | Barre Robert Mormann | — | (760) 272 7022 | GC, remodel, ADU | Phelan · San Bernardino County | — | — |
| Barrera Marble And Granite | Barrera Marble And Granite | — | (562) 964 1440 | Other | San Bernardino · San Bernardino County | — | — |
| Barrera's Landscape | Barrera's Landscape | — | (909) 915 8836 | Windows, patio, painters | Chino · San Bernardino County | — | — |
| Barreto Electric | Gustavo G Barreto | — | (626) 589 7967 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| Barrett Painting | Barrett Painting | — | (909) 239 7838 | Windows, patio, painters | Upland · San Bernardino County | — | — |
| Barrett Painting | Barrett Painting | — | (909) 863 0689 | Windows, patio, painters | Highland · San Bernardino County | — | — |