| Frank Bianchi Metal Works | Frank Bianchi Metal Works | — | (209) 283 4154 | Other | West Point · Calaveras County | — | — |
| Frazier Excavation | Frazier Excavation | — | (209) 765 5339 | Other | Copperopolis · Calaveras County | — | — |
| Fred Miller Construction INC | Zachary John Miller | — | (209) 890 5133 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Freddie Electric | Fredrick Fernando Artiaga | — | (209) 795 2220 | Electricians | Avery · Calaveras County | — | — |
| Freedom Energy Corp | Timothy Michael Dondero | — | (209) 712 1787 | Electricians | Murphys · Calaveras County | — | — |
| Frog Hollow Green Group INC The | Raymond Mark Thengvall | — | (209) 736 0924 | Windows, patio, painters | Angels Camp · Calaveras County | — | — |
| Fuller Construction | Brian Michael Fuller | — | (209) 256 6754 | GC, remodel, ADU | San Andreas · Calaveras County | — | — |
| Fuller Construction Co | Jimmy Allen Fuller | — | (925) 389 0729 | GC, remodel, ADU | Arnold · Calaveras County | — | — |
| Fxf Construction INC | Flynn Xavier Forgette | — | (209) 481 8187 | GC, remodel, ADU | Mokelumne Hill · Calaveras County | — | — |
| G & B Compactor Services | Glenn Allan Cathey | — | (209) 649 3510 | Other | Valley Springs · Calaveras County | — | — |
| Galvan Tree Service | Galvan-cortes Humberto | — | (209) 770 0029 | Other | Arnold · Calaveras County | — | — |
| Gambi Disposal INC | Phillip John Giambastiani | — | (209) 754 3130 | Windows, patio, painters | San Andreas · Calaveras County | — | — |
| Gamma Concrete INC | Shaun Michael Gamma | — | (209) 277 3600 | Other | Valley Springs · Calaveras County | — | — |
| Gamma Rebar INC | Shaun Michael Gamma | — | (209) 277 3600 | Other | Valley Springs · Calaveras County | — | — |
| Garcia Construction | Garcia-martinez Angel | impallari@gmail.com | (209) 768 7396 | GC, remodel, ADU | Avery · Calaveras County | — | — |
| Gardina Construction | Ole Martin Gardina | — | (209) 419 0375 | GC, remodel, ADU | San Andreas · Calaveras County | — | — |
| Garrett's Construction | Mark Shannon Garrett | gsimunichllc@gmail.com | (618) 340-6801 | GC, remodel, ADU | Valley Springs · Calaveras County | — | — |
| Garringer Painting Contractors INC | Garringer Norval | — | (209) 728 0158 | Windows, patio, painters | Murphys · Calaveras County | — | — |
| Gaspers Electric | Gerald Martin Gaspers | — | (209) 601 1171 | Electricians | Valley Springs · Calaveras County | — | — |
| Gates Concrete Construction INC | Brian Charles Gates | gatescustomconcrete@live.com | (209) 763 1057 | GC, remodel, ADU | Burson · Calaveras County | — | — |
| Gaylord Michael | Gaylord Michael | — | (808) 262 7563 | GC, remodel, ADU | Angels Camp · Calaveras County | — | — |
| Gene Carr Jr | Gene Carr Jr | — | (209) 728 2578 | GC, remodel, ADU | Murphys · Calaveras County | — | — |
| Gene P Miller | Gene P Miller | — | (209) 728 2396 | Other | Hathaway Pines · Calaveras County | — | — |
| General Engineering Tectonics | General Engineering Tectonics | — | (209) 481 9080 | GC, remodel, ADU | Burson · Calaveras County | — | — |
| Gilbeau Construction | Erin Brooke Gilbeau | eringilbeau@gmail.com | (209) 743 8365 | GC, remodel, ADU | San Andreas · Calaveras County | — | — |
| Glass King LLC | Taylor Ryan Pioletti | — | (925) 783 2454 | Windows, patio, painters | Valley Springs · Calaveras County | — | — |
| Gold Country Building And Dirt Work | Darryl James Saville | — | (209) 639 2695 | GC, remodel, ADU | Mountain Ranch · Calaveras County | — | — |
| Gold Electric INC | James Robert Heryford | info@gold-electric.com | (209) 728 3371 | Electricians | Murphys · Calaveras County | — | — |
| Gold Sierra Roofing My Malagon | Victor Manuel Malagon | — | (209) 609 6361 | Other roofers | Valley Springs · Calaveras County | — | — |
| Grant Painting | Grant Painting | — | (209) 743 8058 | Windows, patio, painters | Angels Camp · Calaveras County | — | — |
| Green Grass | Green Grass | — | (408) 432 9000 | Windows, patio, painters | Arnold · Calaveras County | — | — |
| Greg Hardy Construction | Gregory Earl Hardy | — | (207) 785 2601 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Greg Kelly Construction | Gregory Nicholes Kelly | — | (209) 559 2678 | GC, remodel, ADU | Copperopolis · Calaveras County | — | — |
| Griffith Construction | Stacey Lynn Mc Carty-Griffith | — | (209) 768 1088 | Other | Copperopolis · Calaveras County | — | — |
| Gronau Construction | Craig Douglas Gronau | — | (209) 419 1314 | GC, remodel, ADU | Rail Road Flat · Calaveras County | — | — |
| Guardian Roofs | Guardian Roofs | — | (858) 876-4230 | Other roofers | San Marcos · Calaveras County | — | — |
| Hancock's Mountain Masonry | Hancock's Mountain Masonry | — | (209) 768 1807 | Other | Avery · Calaveras County | — | — |
| Handgis Construction Company | Nicholas James Handgis | — | (209) 728 7747 | GC, remodel, ADU | Altaville · Calaveras County | — | — |
| Handymatt Construction | Matthew John Owens | — | (925) 497 6800 | GC, remodel, ADU | San Andreas · Calaveras County | — | — |
| Hanshaw Floors | Sheldon Michael Hanshaw | — | (209) 272 9336 | Other | Hathaway Pines · Calaveras County | — | — |