| Fibra Electric | Flores Carlos | — | (510) 812 8034 | Electricians | Rodeo · Contra Costa County | — | — |
| Field Of Dreams Landscaping Company | David Mark Johnson | — | (925) 890 5099 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Field Welding Services | Joseph Patrick Meyer | — | (925) 890 0295 | Other | Concord · Contra Costa County | — | — |
| Fierro Construction INC | Alberto Conde De Vigal | — | (510) 369 4019 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Fife Construction | Christopher Dean Fife | — | (925) 425 8039 | GC, remodel, ADU | Lafayette · Contra Costa County | — | — |
| Figueroa Building | Figueroa Building | — | (925) 470 6408 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| Final Coat Pro Painting | Felix Ricardo Sr Torres Moreno | — | (415) 706 2453 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Final Cut Construction | Andre Burl Vernon | — | (510) 917 3830 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| Finberg Fencing INC | Brett Howard Finberg | eben@eyebytes.com | (209) 637 9424 | Other | Brentwood · Contra Costa County | — | — |
| Fine Design Masonry | Eric Juergen Krueger | — | (510) 816 8788 | Other | Clayton · Contra Costa County | — | — |
| Fine Designs Custom Cabinets And Closets | Hamish Dudgeon Morrison | — | (925) 766 2611 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Fine Home Molding | Fine Home Molding | — | (510) 932 0219 | Other | Concord · Contra Costa County | — | — |
| Finesse Builder INC | Jaroslaw Ryszard Gadek | — | (510) 599 4688 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Finest Steel Studs & Drywall | Finest Steel Studs & Drywall | — | (510) 938 3761 | Other | Concord · Contra Costa County | — | — |
| Finish Coat Painting | Finish Coat Painting | — | (925) 214 3164 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Finish Tech Construction | Matthew Sonny Cammisa | — | (925) 594 1240 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Finta Grading & Tractor Service | Craig Nelson Finta | — | (925) 516 5859 | Other | Byron · Contra Costa County | — | — |
| Fire Detection Unlimited INC | Patricia Ann Pulver | — | (925) 370 8041 | Electricians | Concord · Contra Costa County | — | — |
| Fire Protection Company | David Gary Remsing | — | (415) 580 0077 | Other | Lafayette · Contra Costa County | — | — |
| Fire Protection Management INC | Geary Donald Tsutsui | — | (925) 602 1790 | Other | Martinez · Contra Costa County | — | — |
| Firehouse Pools | Chalit Titirojnoparat | — | (925) 378 2554 | Pool | Walnut Creek · Contra Costa County | — | — |
| Firestorm Protect | Robert Gerald Clifford | firestormprotect@gmail.com | (925) 844-3400 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| First - Rate Fire Protection | First - Rate Fire Protection | — | (510) 367 4187 | Other | El Sobrante · Contra Costa County | — | — |
| First Call Restoration | Mohammadhadi Mohammadi | mahan@firstcallrestorationllc.com | (510) 210 9000 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| First Class Construction | Norris Nelson Clawson | — | (925) 768 2320 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| First Generation Plumbing Corp | Ludwing Haroldo Vasquez Velasquez | — | (925) 329 0005 | Other | Antioch · Contra Costa County | — | — |
| First Place Drywall INC | Lopez Arnoldo | — | (209) 214 1740 | Other | Oakley · Contra Costa County | — | — |
| Fisher Construction | Martin Joseph Fisher | — | (925) 383 1758 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Fitzpatrick Associates | Timothy Anthony Fitzpatrick | bshiels@fitzpatrick-associates.com | (510) 719 0428 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Five Star Home Services | Daniel Andres Garces | — | (925) 978 8800 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Five Star HVAC Service | Luis Martin Santillanguzman | — | (925) 395 0917 | HVAC | Concord · Contra Costa County | — | — |
| Five-o Electric | Robert Kaiu De Laura | — | (925) 234 0647 | Electricians | Antioch · Contra Costa County | — | — |
| Fj & I Engineering INC | Felipe Jesus Martinez | — | (415) 694 0705 | Other | San Pablo · Contra Costa County | — | — |
| Fjellbo & Son Construction INC | Erik Scott Fjellbo | — | (925) 363 3000 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Fjr Construction LLC | Flaviano De Jesus Rodriguez Perez | — | (510) 677 0351 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Fl Painting Company | Lopez Garcia Francisco | — | (510) 685 7908 | Windows, patio, painters | San Pablo · Contra Costa County | — | — |
| Flatiron Dragados-teichert I-80 Truck Lanes Jv | Teichert & Son INC A | — | (707) 742 6000 | Other | Concord · Contra Costa County | — | — |
| Flatiron-dragados-obayashi A Joint Venture | Corporation Obayashi | — | (707) 742 6000 | Other | Concord · Contra Costa County | — | — |
| Flatiron-teichert A Joint Venture | Teichert & Son INC A | — | (707) 742 6000 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Flatiron/dragados/sukut Joint Venture | Dragados West LLC Flatiron | — | (707) 742 6000 | Other | Concord · Contra Costa County | — | — |