| First Choice General Contractor And Builder Services | Ryan Joseph Saldivar | — | (760) 212 9800 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| First Choice Patio Covers INC | Timothy Allen Phillips | — | (951) 816 0018 | Other | Winchester · Riverside County | — | — |
| First Choice Plumbing Heating & Air Conditioning INC | Otis Stephen Ballard | — | (951) 780 8171 | HVAC | Riverside · Riverside County | — | — |
| First Class Leak Detection INC | Jeremy Michael Coates | — | (951) 490 8795 | Other | Lake Elsinore · Riverside County | — | — |
| First Class Plumbing & Rooter Services INC | Elmer George Iii Ray | — | (855) 665 0779 | HVAC | Riverside · Riverside County | — | — |
| First Class Woodworks INC | Enrique Macias | — | (951) 973 1226 | Other | Murrieta · Riverside County | — | — |
| First Division Plumbing | Lopez David | — | (951) 323 1175 | Other | Perris · Riverside County | — | — |
| First Federal Development & Co | Gang Zhou | — | (951) 339 8112 | GC, remodel, ADU | Corona · Riverside County | — | — |
| First Gen Air INC | Frederic Rangel Llamas | — | (951) 400 2810 | HVAC | Perris · Riverside County | — | — |
| First Generation Electrical Contractor | Alberto Fuentes | — | (951) 634 7699 | Electricians | Hemet · Riverside County | — | — |
| First Place Leak Detection INC | Kenneth Andrew Caputo | — | (714) 787 6798 | Other | Riverside · Riverside County | — | — |
| First Response Restoration INC | Levente Levi Borcsa | — | (951) 552 4735 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| First Safety Concrete Co | Rubio Jorge Castro | — | (714) 743 5037 | Other | Corona · Riverside County | — | — |
| First Select Construction INC | Fernando Salgado | — | (951) 543 3284 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Firstchoice | Frank Eugene Leonesio | — | (760) 347 6883 | Electricians | La Quinta · Riverside County | — | — |
| Fischer Construction | Jenni Lee Fischer | — | (909) 229 2630 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Fischer Painting | Fischer Painting | — | (714) 403 7331 | Windows, patio, painters | Canyon Lake · Riverside County | — | — |
| Fisher Wireless Services INC | Steven Kevin Finch | — | (760) 922 4150 | Other | Blythe · Riverside County | — | — |
| Fissile Home Solutions | Fissile Home Solutions | — | (951) 337 2671 | GC, remodel, ADU | Banning · Riverside County | — | — |
| Fitzharris Electric | Hunter Michael Fitzharris | — | (951) 719 0370 | Electricians | Winchester · Riverside County | — | — |
| Five Engineering & Plumbing INC | Jeffrey Dewane Taylor | — | (951) 244 3606 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Five Star Drywall Construction | Alvarez Angel | — | (760) 224 4087 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Five Star Finishing INC | Fernando Castro Villasenor | — | (760) 702 5109 | Windows, patio, painters | Indio · Riverside County | — | — |
| Five Star Home Improvement | Five Star Home Improvement | interested@domainmarket.com | (310) 513 3447 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Five Star Landscape Maintenance INC | Jason Leonard Chaidez | — | (714) 715 3833 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Fix Air | Fix Air | — | (714) 469 4800 | HVAC | Riverside · Riverside County | — | — |
| Fix It Felix Plumbing INC | Mares J Felix Mercado | — | (714) 580 1815 | Other | Riverside · Riverside County | — | — |
| Fixright Roofing INC | John Matthew Kizziar | — | (877) 778 0067 | Other roofers | Temecula · Riverside County | — | — |
| Fjc General Contractor INC | Frank Javier Cano | — | (951) 599 5818 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Fjs Cabinets | Fjs Cabinets | — | (714) 833 9173 | Other | Corona · Riverside County | — | — |
| Flamingo Pool Service INC | William James Andrews | — | (951) 440 8810 | Pool | Temecula · Riverside County | — | — |
| Flanagan's Heating And Air | Thomas Michael Flanagan | — | (442) 400 4908 | HVAC | Palm Springs · Riverside County | — | — |
| Flash Electrical Services | Ocampo Carlos Quezada | — | (951) 768 0159 | Electricians | Corona · Riverside County | — | — |
| Flashman Electric INC | Daniel Ryan Adams | — | (562) 522 6336 | Electricians | Canyon Lake · Riverside County | — | — |
| Flat Top Plumbing | Flat Top Plumbing | — | (702) 521 6250 | Other | Hemet · Riverside County | — | — |
| Flatout Flooring INC | Korey John Reed | — | (909) 821 3720 | Other | Murrieta · Riverside County | — | — |
| Flawless Glass Windows And Doors | Flawless Glass Windows And Doors | — | (951) 545 0113 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Flawless Pool Service | Joseph Luis Gomez | — | (951) 858 5834 | Pool | Norco · Riverside County | — | — |
| Flecha's Construction Clean Up INC | Iniguez Yolanda Luna | — | (951) 205 5169 | Other | Lake Elsinore · Riverside County | — | — |
| Fletcher Electric | Eithen Vance Fletcher | — | (951) 553 9264 | Electricians | Temecula · Riverside County | — | — |