| Flores Roofing | Vera Diego Flores | floresroofing03@gmail.com | (707) 396 6854 | Other roofers | Santa Rosa · Sonoma County | — | — |
| Flores's General Construction Incorporation | Huitareo Hector Flores | — | (707) 393 7208 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Flowright Plumbing | Flowright Plumbing | — | (707) 544 5050 | Other | Santa Rosa · Sonoma County | — | — |
| Flows Painting | Flows Painting | contact@flowspainting.com | (707) 484 0402 | Windows, patio, painters | Santa Rosa · Sonoma County | — | — |
| Flum Construction | David Lloyd Flum | — | (707) 481 3439 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Focal Point Construction | Casey Michael Weeks | — | (541) 490 0598 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Fogg Construction | Ricky Allen Fogg | — | (415) 827 0782 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Folio Glass INC | David John Pope | — | (650) 300 4360 | Windows, patio, painters | Petaluma · Sonoma County | — | — |
| Fondare Finish Construction INC | Lothario Jason Lotho | — | (707) 293 9241 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Fonexperts INC DBA Telecommunications Designs | Bryan David Cates | — | (707) 303 8260 | Other | Santa Rosa · Sonoma County | — | — |
| Food Equipment Repair Service INC | Michael Richard Amandoli | foodfix2004@yahoo.com | (707) 537 7400 | HVAC | Santa Rosa · Sonoma County | — | — |
| Foothill Construction | Douglas Edward Clapp | — | (530) 559 1260 | GC, remodel, ADU | Guerneville · Sonoma County | — | — |
| Foreaker Construction | Donald Christopher Foreaker | — | (707) 481 4359 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Forest Tree Services INC | Forest Reign Kirk | — | (707) 921 6501 | Tree | Santa Rosa · Sonoma County | — | — |
| Four Z Construction | Rick Lee Zappa | — | (707) 843 2261 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Fowler Electric Services INC | Thomas Lee Fowler | — | (707) 658 1491 | Electricians | Petaluma · Sonoma County | — | — |
| Fox Brothers Construction INC | Noel Thomas Fox | — | (415) 748 1647 | GC, remodel, ADU | Monte Rio · Sonoma County | — | — |
| Foxlight Electric | Kenneth John Will | — | (415) 420 5221 | Electricians | Sebastopol · Sonoma County | — | — |
| Foxridge Construction | Ray Anthony Fairlee | — | (707) 249 2503 | GC, remodel, ADU | Geyserville · Sonoma County | — | — |
| Fragoso Home Repair And Remodel INC | Michael Ladd Kesecker | — | (707) 696 8923 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Framing Building & Improvements INC | Jeffery Richard Faulkner | — | (707) 332 9400 | GC, remodel, ADU | Cotati · Sonoma County | — | — |
| Francie's By Design | Heather Ann Ludloff | — | (707) 938 5800 | GC, remodel, ADU | Sonoma · Sonoma County | — | — |
| Francis Mc Connell | Francis Mc Connell | — | (707) 586 1910 | Electricians | Rohnert Park · Sonoma County | — | — |
| Franco Electric - Alternative Power INC | Dante Javier Franco Coronado | — | (707) 489 2601 | Electricians | Santa Rosa · Sonoma County | — | — |
| Franco's Garage Doors | Franco's Garage Doors | — | (707) 838 3833 | Other | Windsor · Sonoma County | — | — |
| Franco's Mechanical | Franco's Mechanical | — | (707) 695 3726 | HVAC | Windsor · Sonoma County | — | — |
| Frank De Niro | Frank De Niro | — | (606) 271 1718 | GC, remodel, ADU | Sebastopol · Sonoma County | — | — |
| Frank Gallagher General Contractor | Frank Gallagher General Contractor | — | (707) 974 2646 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Frank H Tibbens Construction INC | Frank Homer Tibbens | — | (707) 481 1397 | GC, remodel, ADU | Santa Rosa · Sonoma County | — | — |
| Frank Homen Construction | Frank Louis Homen | — | (707) 486 4564 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Frank J Borruso Jr DBA Tamarin Raingutter Service | Frank Joseph Jr Borruso | — | (415) 717 5735 | Other | Petaluma · Sonoma County | — | — |
| Frank Jekabsons | Frank Jekabsons | — | (650) 588 8319 | Other | Santa Rosa · Sonoma County | — | — |
| Frati's Plumbing | Frati's Plumbing | — | (707) 217 2712 | Other | Cotati · Sonoma County | — | — |
| Frc INC | Frank Robert Ruggirello | — | (707) 837 5065 | GC, remodel, ADU | Windsor · Sonoma County | — | — |
| Fred Adriano Masonry Contractor INC | Fred Pacheco Adriano | — | (707) 239 6628 | Other | Windsor · Sonoma County | — | — |
| Fred Mccarthy Concrete | Fred Mccarthy Concrete | — | (415) 572 8914 | Other | Rohnert Park · Sonoma County | — | — |
| Fred The Phone Man | Fred The Phone Man | — | (707) 575 5371 | Other | Rohnert Park · Sonoma County | — | — |
| Freddie Freitas Jr General Contracting And Maintenance INC | Freddie Jr Freitas | — | (707) 974 4280 | GC, remodel, ADU | Petaluma · Sonoma County | — | — |
| Frenzel Electric | Scott Christopher Frenzel | — | (707) 566 7023 | Electricians | Santa Rosa · Sonoma County | — | — |
| Friendly Ornamental And Pleasantly Sturdy Fabrication | Dylan Chester Denicke | — | (510) 684 0246 | Other | Petaluma · Sonoma County | — | — |