| Fmgc General Construction | Frank Alberto Morales | — | (909) 559 0366 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Fmpipeline Co | Montenegro Francisco | — | (424) 246 1348 | Other | San Bernardino · San Bernardino County | — | — |
| Folding Gate Systems INC | James Vernon White | — | (626) 967 4283 | Other | Fontana · San Bernardino County | — | — |
| Fonnair INC | Zaur Huseynov | sales@fonnair.com | (310) 801 8903 | HVAC | Apple Valley · San Bernardino County | — | — |
| Fonseca Construction INC | Fonseca Michael | — | (951) 682 8881 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Fontana Fire Equipment INC | Jana D Collins | — | (909) 884 3912 | Other | San Bernardino · San Bernardino County | — | — |
| Fontes Construction | Tony Jr Fontes | — | (909) 835 7003 | Other | Mentone · San Bernardino County | — | — |
| Fonua Construction | Hokeni Sifa Fonua | — | (909) 230 8281 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Foothill Bath Corporation | Jon Robert Widney | — | (909) 980 5980 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Foothill Carpet INC | Victor Halim Feghali | — | (909) 484 5844 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Foothill Heating & Air Conditioning | Foothill Heating & Air Conditioning | — | (626) 378 6671 | HVAC | Ontario · San Bernardino County | — | — |
| Foothill Orange Coast Chemical | Foothill Orange Coast Chemical | — | (951) 377 3486 | Pool | Rancho Cucamonga · San Bernardino County | — | — |
| Foothill Plumbing Co LLC | Gerardo Chavez | — | (626) 364 2684 | Other | Upland · San Bernardino County | — | — |
| Foothill Water Heaters INC | Jennifer Joan Van Lund | info@ndiscovered.com | (909) 977 1010 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| For Your Walls Only | For Your Walls Only | — | (909) 949 6924 | GC, remodel, ADU | Upland · San Bernardino County | — | — |
| For Your Walls Only Electric | Maslowski Frank | — | (909) 949 6924 | Electricians | Upland · San Bernardino County | — | — |
| Forbes Construction | Ronnie Jr| Ron Forbes | — | (760) 524 7523 | HVAC | Apple Valley · San Bernardino County | — | — |
| Force Elevator INC | Ryan Kenneth Morin | info@forceelevator.com | (909) 960 5080 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Force Plumbing | Force Plumbing | — | (951) 377 7540 | Other | San Bernardino · San Bernardino County | — | — |
| Force Restoration INC | Gonzalez Omar | — | (323) 594 9690 | GC, remodel, ADU | Hesperia · San Bernardino County | — | — |
| Ford Brothers Framing INC | Lance Damon Ford | — | (909) 773 0303 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Foresight Construction Services LLC | Landon Edward Diener | — | (909) 306 8173 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Forest Plumbing | Forest Plumbing | — | (909) 273 9031 | Other | Lake Arrowhead · San Bernardino County | — | — |
| Forest Tree Care INC | Ricardo Macias | — | (909) 568 6919 | Tree | Chino · San Bernardino County | — | — |
| Form & Function Landscape | Form & Function Landscape | — | (909) 525 7878 | Windows, patio, painters | Ontario · San Bernardino County | — | — |
| Forrest Glass & Door | Jon Lawrence Harmon | — | (909) 481 7461 | Windows, patio, painters | Ontario · San Bernardino County | — | — |
| Forte Painters And General Construction | Fuerte Luis | — | (626) 201 7991 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Forte Reinforcing INC | William Alfredo Ruano | — | (909) 222 6866 | Other | Rialto · San Bernardino County | — | — |
| Forte Tile | Forte Tile | — | (951) 384 8054 | Other | Yucca Valley · San Bernardino County | — | — |
| Fortran Electric | Larry Glaser | — | (571) 235 2435 | Electricians | Needles · San Bernardino County | — | — |
| Fortuny-air | Ronny Rocael Hernandez | info@fortuny-air.com | (323) 578 4334 | HVAC | Victorville · San Bernardino County | — | — |
| Fossa Group INC | Robert Samuel Riggio | — | (909) 606 9400 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Fossler Plumbing | Michael Kingston Fossler | — | (909) 257 6458 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Foundation Design & Build | Miguel Angel Salas | — | (909) 927 7060 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Fountain Gate Construction INC | Michael Thomas Talley | — | (909) 693 2681 | GC, remodel, ADU | Yucaipa · San Bernardino County | — | — |
| Four Aces Plumbing | Four Aces Plumbing | — | (760) 464 9344 | Other | Yucca Valley · San Bernardino County | — | — |
| Fowles Electric INC | Dennis Michael Jr Fowles | fowleselectric@gmail.com | (909) 792 7449 | Electricians | Highland · San Bernardino County | — | — |
| Fox Framing INC | Cordova Leopoldo Villegas | — | (909) 758 1355 | Other | San Bernardino · San Bernardino County | — | — |
| Fox Pest Control San Bernardino | Fox Pest Control San Bernardino | — | (909) 870-3975 | Pest, tile roofs | San Bernardino · San Bernardino County | — | — |
| Foxtrot Construction | Ricardo Fosado | — | (310) 490 7737 | Electricians | Ontario · San Bernardino County | — | — |