| Forgepoint Building And Remodeling | Kevin Todd Strickland | — | (800) 340 8362 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Formatic Property Management Inc. | Formatic Property Management Inc. | — | (951) 394-0030 | Property managers | Riverside · Riverside County | — | — |
| Formosa Windows & Doors Glazing Corporation | Chengwei Lin | — | (951) 624 5446 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Forster Construction | Daniel J Forster | — | (760) 310 7079 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Fortified Building & Fire Protection Corp | Pang Chiu Chen | — | (951) 314 4338 | GC, remodel, ADU | Eastvale · Riverside County | — | — |
| Fortified Foundations INC | Thomas Justin Jr Porter | — | (951) 553 1616 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Fortis Fire & Safety INC | James Fulton Jr Moyer | — | (951) 735 5560 | Other | Corona · Riverside County | — | — |
| Fosters Grading | Fosters Grading | — | (909) 261 3834 | Other | Riverside · Riverside County | — | — |
| Foundational Painting | Foundational Painting | — | (951) 224 1668 | Windows, patio, painters | Moreno Valley · Riverside County | — | — |
| Four Aces Garage Doors | Four Aces Garage Doors | — | (909) 702 1966 | Other | Riverside · Riverside County | — | — |
| Four Arrows Concrete Pumping INC | Jerald James Riley | — | (951) 903 3320 | Other | Norco · Riverside County | — | — |
| Four Elements Contractors INC | Oscar Arnulfo Flores | — | (323) 383 3425 | Other | Corona · Riverside County | — | — |
| Four Elements Plumbing INC | Sergio Pablo Anaya | — | (323) 563 2826 | Other | Corona · Riverside County | — | — |
| Four Kids Construction | Armando Salazar-Gomez | — | (760) 275 4532 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Four Point Development INC | Luis Carlos Romero | — | (760) 219 0236 | GC, remodel, ADU | Desert Hot Springs · Riverside County | — | — |
| Four Points Fence INC | Eric Lugo Espino | — | (951) 381 1753 | Other | Beaumont · Riverside County | — | — |
| Four Seasons Landscaping Services Co | Jose De Jesus Lopez | — | (909) 810 9067 | Windows, patio, painters | Calimesa · Riverside County | — | — |
| Four Stars Landscape Corp | Rodriguez Oscar Gutierrez | — | (714) 749 0943 | Windows, patio, painters | Corona · Riverside County | — | — |
| Four-star Rebar INC | Richard Greg Martinez | — | (951) 588 6916 | Other | Riverside · Riverside County | — | — |
| Fox Company Electric LLC | Kevin Alan Morrison | — | (951) 236 9559 | Electricians | Desert Hot Springs · Riverside County | — | — |
| Fox Construction | Riquelme Recinos | — | (951) 427 8237 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Fox Painting Contractors | Troy Kenneth Pourchot | — | (949) 922 9027 | Windows, patio, painters | Corona · Riverside County | — | — |
| Foxx Curci Construction | Brian Anthony Curci | — | (760) 989 2108 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Foxx Roofing | Eric James Fuchs | — | (951) 293 2284 | Other roofers | Wildomar · Riverside County | — | — |
| Fp Iron Fence & Gate | Garcia Francisco Perez | — | (323) 359 2304 | Other | Temecula · Riverside County | — | — |
| Fps Engineering | Fps Engineering | — | (951) 796 2726 | Other | Homeland · Riverside County | — | — |
| Fr Artificial Turf | Fr Artificial Turf | — | (760) 574 5866 | Other | Indio · Riverside County | — | — |
| Fr Services | Scott Duane Young | — | (760) 343 3933 | GC, remodel, ADU | Thousand Palms · Riverside County | — | — |
| Frahm Bros INC | Michael Richard Frahm | — | (949) 673 9286 | Other | Riverside · Riverside County | — | — |
| Framing By Superior INC | Eddie Lee Still | — | (951) 808 8780 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Franchini Construction | Michael Anthony Iii Franchini | — | (714) 586 1503 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Francis & Wane INC | Julian Wayne Jr Andrews | — | (760) 578 8677 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |
| Francisco Antonio Martinez Zarate | Francisco Antonio Martinez Zarate | — | (951) 772 7167 | Windows, patio, painters | Hemet · Riverside County | — | — |
| Francisco Becerra Painting | Francisco Becerra Painting | — | (760) 397 6340 | Windows, patio, painters | Indio · Riverside County | — | — |
| Francisco Garcia | Francisco Garcia | — | (909) 272 0999 | Other | Riverside · Riverside County | — | — |
| Francisco J Martinez | Francisco J Martinez | — | (323) 972 6118 | Electricians | Jurupa Valley · Riverside County | — | — |
| Francisco Montano | Francisco Montano | efem.design@gmail.com | (760) 989 9906 | Electricians | La Quinta · Riverside County | — | — |
| Francisco's Window Covering Installations | Francisco's Window Covering Installations | — | (951) 288 6646 | Other | Riverside · Riverside County | — | — |
| Franco Landscape INC | Kevin Fidel Franco | — | (714) 824 9475 | Windows, patio, painters | Menifee · Riverside County | — | — |
| Franco Rojo | Franco Rojo | — | (909) 771 0220 | GC, remodel, ADU | Murrieta · Riverside County | — | — |