| Big Fish Construction INC | Adrian Christopher Fisher | — | (707) 651 1253 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| Binkley Electric | Brian Jeffrey Binkley | — | (707) 485 8641 | Electricians | Redwood Valley · Mendocino County | — | — |
| Black Diamond Tree Experts | Marilyn Denay Steckler | — | (707) 807 4182 | Tree | Point Arena · Mendocino County | — | — |
| Black Shamrock Construction & Engineering Co | Travis Patrick O'ferrall | — | (707) 357 3333 | Other | Ukiah · Mendocino County | — | — |
| Black Sheep Builder | Black Sheep Builder | — | (562) 587 7255 | GC, remodel, ADU | Hopland · Mendocino County | — | — |
| Blum's Affordable Plumbing INC | Robert Nowell Jr Blum | — | (707) 456 0996 | Other | Willits · Mendocino County | — | — |
| Blundell Construction | Clayton Edward Blundell | — | (909) 489 8311 | GC, remodel, ADU | Potter Valley · Mendocino County | — | — |
| Boles Heating & Air Conditioning Sheet Metal | Kevin Michael Boles | — | (707) 481 9115 | HVAC | Hopland · Mendocino County | — | — |
| Bonnie Tide Tattoo Studio | Bonnie Tide Tattoo Studio | — | (707) 684-6369 | Windows, patio, painters | Mendocino · Mendocino County | — | — |
| Bouthillier's Construction INC | Kevin David Bouthillier | — | (707) 459 4041 | Tree | Willits · Mendocino County | — | — |
| Brad Alpers | Brad Alpers | — | (707) 684 9747 | GC, remodel, ADU | Boonville · Mendocino County | — | — |
| Brad Ingram Construction | Brad Allen Ingram | — | (707) 489 6741 | Other | Redwood Valley · Mendocino County | — | — |
| Bradford Painting | Bradford Painting | wade@bradfordpainting.com | (830) 459-3626 | Windows, patio, painters | Gualala · Mendocino County | — | — |
| Brandon Builders | Brandon Builders | — | (707) 621 1571 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Brandon Haydon Construction | Brandon Robert Haydon | — | (707) 477 4593 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Branesky Heating & Sheet Metal INC | Sean Michael Cleary | — | (707) 964 0691 | HVAC | Fort Bragg · Mendocino County | — | — |
| Brey Construction | Joseph Iv Brey | — | (707) 357 1808 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Brian M Dixon General Contractor | Brian M Dixon General Contractor | — | (707) 888 0520 | GC, remodel, ADU | Sea Ranch · Mendocino County | — | — |
| Brian Powell | Brian Powell | — | (707) 234 0025 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| Brian Smirke | Brian Smirke | — | (310) 431 9784 | GC, remodel, ADU | Albion · Mendocino County | — | — |
| Brightside Heat Pumps & Air Solutions LLC | Jairo Dario Perez | — | (707) 513 6772 | HVAC | Ukiah · Mendocino County | — | — |
| Britos Plumbing Services | Alexis Michell Brito Palomares | — | (707) 799 9730 | Other | Ukiah · Mendocino County | — | — |
| Brown Construction Services | William Arthur Brown | — | (707) 972 2816 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| Bryan's Glass INC | Bryan Lee Wilson | — | (707) 480 2772 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Bud Garman Construction Services INC | Beda Henry Garman | — | (707) 459 5859 | Other | Willits · Mendocino County | — | — |
| Bullseye Construction | Jolson Jacob Sisneros | — | (707) 357 0052 | GC, remodel, ADU | Albion · Mendocino County | — | — |
| Busch Construction & Electric | Korla James Buschbacher | — | (707) 462 8749 | Electricians | Ukiah · Mendocino County | — | — |
| C A C Construction | Casey Alen Cochran | info@cacconstruction.com | (514) 983-7200 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| C Edison Construction | Edison Chante | — | (707) 972 4809 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| C G K Construction | Christoph Gerhard Klinger | — | (707) 459 2143 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| C Mann Contractor | C Mann Contractor | — | (707) 489 6040 | GC, remodel, ADU | Potter Valley · Mendocino County | — | — |
| C N A Metalworks INC | Chris Neal Aitchison | — | (707) 785 2366 | HVAC | The Sea Ranch · Mendocino County | — | — |
| C R S Construction | Robert Dennis Scroggin | — | (707) 972 6098 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| C W Sams Tile | C W Sams Tile | — | (707) 272 4581 | Other | Willits · Mendocino County | — | — |
| C Y Painting | C Y Painting | — | (707) 964 0347 | Windows, patio, painters | Fort Bragg · Mendocino County | — | — |
| C. Forrester General Manuf. Housing | C. Forrester General Manuf. Housing | — | (530) 712 1946 | Other | Ukiah · Mendocino County | — | — |
| Ca Construction INC | Alex Cornelio-Aguilar | — | (650) 464 8681 | GC, remodel, ADU | Potter Valley · Mendocino County | — | — |
| Cabinet Facelift Company The | Stephen Delmore Hill | — | (707) 486 2302 | Other | Laytonville · Mendocino County | — | — |
| Cabinet Werks INC | Keith Charles Graydon | — | (707) 485 1102 | Other | Ukiah · Mendocino County | — | — |
| Caccamo Construction | Vincent R Caccamo | — | (707) 813 7982 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |