| Black Diamond Tile INC | Nicanor Lopez Barragan | — | (209) 481 9811 | Other | Stockton · San Joaquin County | — | — |
| Black Dog Const | Black Dog Const | — | (209) 606 0915 | GC, remodel, ADU | Escalon · San Joaquin County | — | — |
| Black Stone River Pools INC | Adan Martin Ruiz | — | (209) 627 7120 | Pool | Tracy · San Joaquin County | — | — |
| Blakeley's Plastering | Blakeley's Plastering | — | (209) 483 7692 | Other | Escalon · San Joaquin County | — | — |
| Blakemore Construction | Jacob Eugene Blakemore | — | (209) 810 8693 | GC, remodel, ADU | Victor · San Joaquin County | — | — |
| Blinds Etc | Blinds Etc | — | (209) 839 1790 | Other | Tracy · San Joaquin County | — | — |
| Blink Charging | Blink Charging | support@blinkcharging.com | — | EV chargers | San Joaquin · San Joaquin County | — | — |
| Blue Angel Mechanical Heating And Air Conditioning | Jesus Salome Machado | — | (209) 810 5524 | HVAC | Stockton · San Joaquin County | — | — |
| Blue Builders Legacy | Gabino Ceballos Jaime | — | (209) 371 1032 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Blue Collar Electrical Services | Nicholas Willis Custodio | — | (209) 221 9579 | Electricians | Lathrop · San Joaquin County | — | — |
| Blue Iron Corp | Daniel Leroy Baker | — | (916) 441 3538 | Other | Lodi · San Joaquin County | — | — |
| Blue Mile Construction | Samantha Lenlee Bella Hola | — | (209) 640 6132 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Blue Valley Roofing Corp | Edgar N Ruiz | — | (209) 513 0020 | Other roofers | Stockton · San Joaquin County | — | — |
| Blue-collar Cleanup LLC | Aguilarcedeno Daniel | — | (209) 843 8010 | Other | Lodi · San Joaquin County | — | — |
| Bnb Electric And Controls INC | Sokchea Heng | — | (510) 851 1549 | Electricians | Tracy · San Joaquin County | — | — |
| Bob & Sons Electric INC | John Bradley Burns | — | (925) 200 2195 | Electricians | Tracy · San Joaquin County | — | — |
| Bob Grossi Construction INC | Robert Louie Grossi | — | (209) 838 7469 | GC, remodel, ADU | Escalon · San Joaquin County | — | — |
| Bockmon & Woody Electric Co INC | Nicholas John Woody | — | (209) 464 4878 | Electricians | Stockton · San Joaquin County | — | — |
| Bonilla's Flooring INC | Norman Enrique Bonilla Nunez | — | (209) 627 6746 | Other | Manteca · San Joaquin County | — | — |
| Boon's Heating & Air | Boon's Heating & Air | — | (209) 992 8003 | HVAC | Stockton · San Joaquin County | — | — |
| Booth Electric | Bradley John Booth | — | (209) 649 0056 | Electricians | Stockton · San Joaquin County | — | — |
| Born Again Painting | Born Again Painting | — | (209) 518 0601 | Windows, patio, painters | Stockton · San Joaquin County | — | — |
| Borncamp Painting | Borncamp Painting | — | (209) 835 7000 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| Boti's Industrial Systems LLC | Burdit Bartley Phillips | — | (209) 360 3139 | Electricians | Lodi · San Joaquin County | — | — |
| Boyce Holdings INC | Albert G Boyce | — | (209) 479 2896 | GC, remodel, ADU | Manteca · San Joaquin County | — | — |
| Boyd Wheeler | Boyd Wheeler | — | (209) 612 0231 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |
| Boyes Electric INC | Borin Yelcy Reyes Luna | — | (925) 364 5757 | Electricians | Stockton · San Joaquin County | — | — |
| Brad K Sousa | Brad K Sousa | — | (209) 603 5176 | GC, remodel, ADU | Stockton · San Joaquin County | — | — |
| Brad Poser Const | Brad Poser Const | — | (209) 329 0283 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Bradburn Electric | Kent Douglas Bradburn | — | (209) 597 4901 | Electricians | Tracy · San Joaquin County | — | — |
| Bradbury Tile & Stone LLC | Lance Trevor Bradbury | — | (209) 214 7510 | Other | Ripon · San Joaquin County | — | — |
| Bradshaw Landscaping | Bradshaw Landscaping | — | (209) 327 0593 | Windows, patio, painters | Acampo · San Joaquin County | — | — |
| Brady Construction | Patrick James Brady | info@bradyconstruction.com | (209) 603 0655 | GC, remodel, ADU | Linden · San Joaquin County | — | — |
| Branco Construction INC | George David Jr Branco | — | (209) 712 6561 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Brandon Arata | Brandon Arata | — | (925) 487 0826 | Other | Tracy · San Joaquin County | — | — |
| Brandon Lackyard Construction | Brandon Montgomery Lackyard | — | (209) 912 8358 | GC, remodel, ADU | Lodi · San Joaquin County | — | — |
| Brannon Canvas & Upholstery & Awnings | Larry Mance Bingham | — | (209) 465 2480 | Other | Stockton · San Joaquin County | — | — |
| Brannon Painting | Brannon Painting | frank@brannonpainting.com | (209) 327 7952 | Windows, patio, painters | Lodi · San Joaquin County | — | — |
| Bratts Painting | Bratts Painting | eric@brattspainting.com | (209) 390 3581 | Windows, patio, painters | Manteca · San Joaquin County | — | — |
| Bravo Construction | Daniel Rios Bravo | — | (925) 640 0859 | GC, remodel, ADU | Tracy · San Joaquin County | — | — |