| Fuentes Plumbing & Welding | Fuentes Plumbing & Welding | — | (562) 572 8666 | Other | Riverside · Riverside County | — | — |
| Fuerte's Construction Co | Fuerte Miguel | — | (562) 572 7103 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Fulcrum Build | Fulcrum Build | — | (310) 570 9535 | Electricians | Temecula · Riverside County | — | — |
| Fulfill Power INC | Jose Juan Contreras | — | (909) 315 0078 | Electricians | Temecula · Riverside County | — | — |
| Full Blast HVAC | Full Blast HVAC | — | (909) 434 2197 | HVAC | Beaumont · Riverside County | — | — |
| Full Circle Maintenance And Construction | Stewart John Dixon | — | (951) 707 6538 | GC, remodel, ADU | Nuevo · Riverside County | — | — |
| Full House Renovations | Eliseo Gomez | info@fullhouserenovations.com | (714) 718 2192 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Full Service | John Curtis Opitz | support@fullservice.com | (909) 994 5828 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Full Service Maintenance | Ryan John Cobb | — | (951) 684 7510 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Full Spectrum Air Service | Daniel John Jaramillo | — | (951) 595 5466 | HVAC | Temecula · Riverside County | — | — |
| Full Throttle Concrete Cutting INC | Philip Dean Lauck | — | (714) 293 8029 | Other | Corona · Riverside County | — | — |
| Full Tile & Stone INC | Arturo Daniel Duran | — | (951) 634 4495 | Other | Menifee · Riverside County | — | — |
| Full Tile Flooring INC | Juan Carlos Gonzalez | — | (760) 409 0851 | Other | Cathedral City · Riverside County | — | — |
| Full Traffic Maintenance INC | Alexander Neil Salgado | — | (951) 520 9990 | Other | Corona · Riverside County | — | — |
| Fullhouse Restoration | Dean Christopher West | — | (800) 311 7087 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Funk E INC | Robert Capron Funk | — | (951) 246 2751 | Electricians | Lake Elsinore · Riverside County | — | — |
| Funlimited INC DBA Hb Electric | Matthew Ryan Fralick | — | (951) 639 7585 | Electricians | Wildomar · Riverside County | — | — |
| Fusero INC DBA Western Air Cooling & Heating | Adam Joseph Fuson | — | (760) 984 3151 | HVAC | Palm Desert · Riverside County | — | — |
| Fusion Air Conditioning & Heating | Fusion Air Conditioning & Heating | — | (909) 507 1809 | HVAC | Menifee · Riverside County | — | — |
| Fusion Design & Build INC | Jiamin Wang | — | (951) 666 9666 | GC, remodel, ADU | Menifee · Riverside County | — | — |
| Fusion Sign & Design LLC | Loren Alan Hanson | — | (951) 685 9660 | Other | Riverside · Riverside County | — | — |
| Fusionworks Welding & Fabrication LLC | Daniel Murillo Gonzalez | — | (951) 581 1282 | Other | Lake Elsinore · Riverside County | — | — |
| Future Project Solution | Future Project Solution | — | (714) 507 0289 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Future Tech INC | Dieter Karl Konnegen | — | (760) 641 4194 | Electricians | Palm Desert · Riverside County | — | — |
| Fuzzy Logic Fabrication | Carol Evelyn Aebischer | — | (951) 533 5960 | Other | Perris · Riverside County | — | — |
| Fv General Contracting INC | Felipe Ventura Rivera | — | (714) 716 7889 | GC, remodel, ADU | Norco · Riverside County | — | — |
| Fx Signs | Fx Signs | — | (951) 689 0270 | Other | Corona · Riverside County | — | — |
| G & A Construction & Development | Gabriel Ruiz Alvarez | — | (714) 265 2788 | GC, remodel, ADU | Perris · Riverside County | — | — |
| G & A Glazing | Gustavo Alonso Ambriz | gaglazing@outlook.com | (760) 485 5912 | Windows, patio, painters | La Quinta · Riverside County | — | — |
| G & C Painting | G & C Painting | — | (951) 303 4555 | Windows, patio, painters | Hemet · Riverside County | — | — |
| G & D Construction | George Guzman | — | (951) 807 4280 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| G & D Construction | Gaby Gaby Azar | — | (951) 427 3160 | GC, remodel, ADU | Corona · Riverside County | — | — |
| G & G Backflow | Sean William Harrison | — | (951) 683 3538 | Windows, patio, painters | Riverside · Riverside County | — | — |
| G & G Electric INC | Gilberto Sr Chavez | — | (951) 776 8099 | Electricians | Riverside · Riverside County | — | — |
| G & J General Construction & Consulting | Leyva Sergio | — | (951) 224 4252 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| G & M Construction And Remodels | German Alonso Ortega | — | (909) 994 8038 | GC, remodel, ADU | Jurupa Valley · Riverside County | — | — |
| G & M Electric Of The Desert INC | Cesar Gonzalez | — | (760) 250 1424 | Electricians | Cathedral City · Riverside County | — | — |
| G & P Landscaping | Jorge Luis Penaloza | — | (760) 809 2420 | Windows, patio, painters | Temecula · Riverside County | — | — |
| G & S Plumbing Company INC | Gonzalo Murillo Murillo | — | (951) 463 0170 | Other | Norco · Riverside County | — | — |
| G & W Painting | G & W Painting | — | (951) 775 7042 | Windows, patio, painters | Lake Elsinore · Riverside County | — | — |