| Brown And Caldwell Constructors | Kyle Joe Cunningham | — | (915) 210 2245 | Other | Walnut Creek · Contra Costa County | — | — |
| Brown Construction | Thomas John Brown | — | (925) 808 9550 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Browning Construction And Remodel | Justin Charles Browning | — | (925) 980 6391 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Browning Masonry | Browning Masonry | — | (925) 228 7833 | Other | Martinez · Contra Costa County | — | — |
| Brp Enterprises LLC | Ronald Scott Polasek | info@brpenterprises.com | (925) 322 1440 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Bruce Alan Mattoch | Bruce Alan Mattoch | — | (415) 302 6975 | Windows, patio, painters | El Sobrante · Contra Costa County | — | — |
| Bruce C Mac Dougall Construction Co | Bruce Charles Mac Dougall | — | (925) 945 7413 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Bruce Carone Grading & Paving INC | Adam Joseph Carone | — | (510) 787 4070 | GC, remodel, ADU | Crockett · Contra Costa County | — | — |
| Bruce Rinne | Bruce Rinne | — | (510) 741 3681 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Brucker Building Company INC | Francis Andrew Brucker | — | (510) 593 6122 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Bruno Framing | Bruno Framing | — | (510) 472 5834 | Other | Pittsburg · Contra Costa County | — | — |
| Brunswig Electric Co | Fred Davis Brunswig | — | (925) 324 0127 | Electricians | Walnut Creek · Contra Costa County | — | — |
| Brush Strokes For Folks | Brush Strokes For Folks | — | (925) 628 4242 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Bryan's Landscaping Service | Thanh Vinh Nguyen | bryanslandscaping@gmail.com | (925) 261 9285 | Windows, patio, painters | Bay Point · Contra Costa County | — | — |
| Bsm Construction INC | Sam Iii Martinovich | — | (925) 688 1234 | Other roofers | Concord · Contra Costa County | — | — |
| Budget Blinds Of The Delta | Budget Blinds Of The Delta | — | (925) 691 4444 | Other | Brentwood · Contra Costa County | — | — |
| Budget Handyman Services | Robert Gramlich Angelsberg | ra062101@aol.com | (925) 577 3025 | GC, remodel, ADU | Pacheco · Contra Costa County | — | — |
| Build By Bogdan | Build By Bogdan | — | (415) 310 2906 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Build It Right Construction | Adam Eugene Wilhite | — | (925) 864 0846 | GC, remodel, ADU | Pacheco · Contra Costa County | — | — |
| Build Lamorinda | Richard Michael Wilson | — | (415) 235 7425 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Build Right | Build Right | info@buildright.com | (415) 969 1314 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Build Strong Construction And Remodeling | Luis Alfredo Almaraz Rosales | office@buildstrongconstructionbay.com | (650) 334 8815 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Build Tech Construction INC | Victor Yu-xiang Huang | — | (510) 693 8609 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Build Wise Construction | Gonzales Jaime | — | (925) 813 9713 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Build X Contracting Corp | Dylan Anthony Medel | — | (925) 386 5500 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Builder Buddies INC | Noah Lopez | — | (925) 235 2064 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Builders Group & Design INC | David Lee Tejeda | — | (650) 942 5641 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Building Services / System Maintenance Incorporated | Sam Iii Martinovich | — | (925) 688 1234 | Other roofers | Concord · Contra Costa County | — | — |
| Buildrite Bay Area INC | Calixtro Fermin Alvarado | — | (510) 256 6039 | GC, remodel, ADU | El Sobrante · Contra Costa County | — | — |
| Built Icon | Eric Michael Davis | — | (415) 265 4393 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Built Like Rome Concrete Services | Carmo Guerra Iudi Do | — | (415) 813 9073 | Other | Walnut Creek · Contra Costa County | — | — |
| Built Right Construction And Restoration | Carlos Rafael Hernandez-Lopez | info@builtrightcnd.com | (925) 444 5666 | GC, remodel, ADU | Pacheco · Contra Costa County | — | — |
| Bulldog Green Remediation INC | Peter Anderson Fuller | — | (925) 369 8525 | Other | Pleasant Hill · Contra Costa County | — | — |
| Bullfinch Construction INC | Pablo Efrain Arteaga Gomez | — | (925) 719 4569 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Bundy And Son Painting | Bundy And Son Painting | — | (510) 499 5345 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Bunnell's Cabinets | Bunnell's Cabinets | — | (925) 634 1519 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Buon Huasi | Buon Huasi | — | (925) 330 2024 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Burke Painting | Burke Painting | — | (415) 609 3864 | Windows, patio, painters | Pleasant Hill · Contra Costa County | — | — |
| Burke Peter | Burke Peter | — | (760) 390 4079 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Burkin Electric | James Joseph Burkin | — | (925) 212 3339 | Electricians | Concord · Contra Costa County | — | — |