| B Kim Lilly Const Co | Bryon Kim Lilly | — | (805) 238 2017 | Other | Paso Robles · San Luis Obispo County | — | — |
| B P General Engineering | B P General Engineering | — | (805) 528 0882 | Other | Los Osos · San Luis Obispo County | — | — |
| B Thomas Cabinetry | B Thomas Cabinetry | — | (805) 748 0928 | Other | Atascadero · San Luis Obispo County | — | — |
| B Z Plumbing | B Z Plumbing | info@bzplumbing.com | (805) 710 2040 | Other | Nipomo · San Luis Obispo County | — | — |
| B&t Service Station Contractors | Christopher Gardner Fasse | — | (805) 929 8944 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Back Bay Construction | Richard Bruce Orrick | — | (805) 215 6223 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Back Door | Steven Frederick Lessi | — | (805) 441 2591 | Other | Cayucos · San Luis Obispo County | — | — |
| Backyard Visions INC | John Peter Ioppini | — | (805) 466 5142 | Pool | Atascadero · San Luis Obispo County | — | — |
| Bahr Builders INC | Christopher Edward Bahr | — | (805) 540 9296 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Bailey Painting | Christopher Michael Bailey | — | (805) 439 3939 | Windows, patio, painters | San Luis Obispo · San Luis Obispo County | — | — |
| Baim Construction Services | Steven Willard Baim | — | (818) 681 8850 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Baird Building Company | Brian Jason Baird | — | (805) 459 7271 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Baker Street Electric | Petrus Gerhardus Neethling | bakerstreetelectric@gmail.com | (805) 709 2786 | Electricians | Grover Beach · San Luis Obispo County | — | — |
| Baksic Construction | Scott William Baksic | — | (805) 235 4792 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Baldwin Electric Service | Howard Arnold Baldwin | — | (805) 712 1844 | Electricians | Atascadero · San Luis Obispo County | — | — |
| Bamboo Plumbing & Remodeling | Bamboo Plumbing & Remodeling | — | (805) 668 1222 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Banderas Construction LLC | Jose Jesus Banderas | — | (805) 806 5017 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Banzai Builds INC | Frank Daniel Salamida | info@banzaibuilds.com | (805) 776 3867 | GC, remodel, ADU | Cayucos · San Luis Obispo County | — | — |
| Bar W Fence Co LLC | Sam Mcbride Wood | — | (406) 451 2530 | Other | Creston · San Luis Obispo County | — | — |
| Baranek Construction | Christopher David Baranek | info@indiantypefoundry.com | (805) 610 8079 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Barcellos Construction | Matthew Norman Barcellos | — | (805) 541 0850 | GC, remodel, ADU | Arroyo Grande · San Luis Obispo County | — | — |
| Barclay A Barrett | Barclay A Barrett | — | (805) 423 4422 | GC, remodel, ADU | Grover Beach · San Luis Obispo County | — | — |
| Barefoot Enterprises INC | Ian Michael Charnley | — | (805) 462 2485 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |
| Barker Built Construction | Matthew Paul Barker | — | (805) 440 3959 | GC, remodel, ADU | Nipomo · San Luis Obispo County | — | — |
| Barnhart Painting & Design | Barnhart Painting & Design | — | (805) 305 0302 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| Barnhill Construction | Robin Edward Barnhill | — | (805) 441 2427 | Other | Arroyo Grande · San Luis Obispo County | — | — |
| Barnick Wood Design INC | Nicholas Carter Barnick | — | (805) 489 0229 | Other | San Luis Obispo · San Luis Obispo County | — | — |
| Baron Construction INC | Erica Ann Garate | — | (805) 466 1497 | Other | Atascadero · San Luis Obispo County | — | — |
| Barone General Construction | William Phillip Barone | — | (805) 801 1206 | GC, remodel, ADU | San Luis Obispo · San Luis Obispo County | — | — |
| Barrett Martin | Barrett Martin | — | (805) 458 6272 | GC, remodel, ADU | Morro Bay · San Luis Obispo County | — | — |
| Bauer Tile & Stone | Bauer Tile & Stone | — | (805) 296 8046 | Other | Paso Robles · San Luis Obispo County | — | — |
| Bayside Painting | Bayside Painting | info@baysidepainting.com | (805) 528 1572 | Windows, patio, painters | Los Osos · San Luis Obispo County | — | — |
| Baywood Construction | Michael Gregory Sloan | — | (805) 712 7728 | GC, remodel, ADU | Atascadero · San Luis Obispo County | — | — |
| Baywood Contracting | Jake William Whiddon | baywoodcontracting@gmail.com | (805) 235 6421 | GC, remodel, ADU | Los Osos · San Luis Obispo County | — | — |
| Baywood Electric | Joel Owen Johnson | — | (805) 235 5143 | Electricians | Los Osos · San Luis Obispo County | — | — |
| Baywood Painting | Baywood Painting | — | (805) 471 9700 | Windows, patio, painters | Grover Beach · San Luis Obispo County | — | — |
| Bbn Services | Don Louis Nicholas | — | (805) 704 0069 | Other | Nipomo · San Luis Obispo County | — | — |
| Bc Construction | Benjamin Shawn Carroll | — | (805) 423 9112 | GC, remodel, ADU | Paso Robles · San Luis Obispo County | — | — |
| Bc Electric Enterprises INC | Bart Allen Calmenson | — | (805) 441 3220 | Electricians | Pismo Beach · San Luis Obispo County | — | — |
| Beach Cities Electric | William Bradley Thompson | — | (805) 460 0108 | Electricians | Atascadero · San Luis Obispo County | — | — |