| Grid Power Solutions | Juarez Jesus Cruz | — | (909) 730 5369 | Electricians | Loma Linda · San Bernardino County | — | — |
| Grind House Audio Video Electrical | Angelo Raul Navarrette | — | (760) 989 2229 | Electricians | Yucaipa · San Bernardino County | — | — |
| Grizzly Welding INC | Jesus Juan Fabela Hernandez | — | (714) 335 3747 | Other | Chino · San Bernardino County | — | — |
| Grotewold Construction | Rodney Louis Grotewold | — | (909) 844 5034 | GC, remodel, ADU | Lake Arrowhead · San Bernardino County | — | — |
| Ground Down Engineering | Michael Anthony Leon | — | (760) 559 8291 | Other | Apple Valley · San Bernardino County | — | — |
| Ground Werks Plumbing And Rooter | Shelton Forrest Ogg | — | (909) 240 8018 | Other | Rancho Cucamonga · San Bernardino County | — | — |
| Groundbreaking Design Building | Fernando Cruz | — | (562) 544 4267 | GC, remodel, ADU | Ontario · San Bernardino County | — | — |
| Growth Development Marketing Incorporated | Gregory Alan Gates | — | (909) 627 0200 | Other | Chino · San Bernardino County | — | — |
| Grt Concrete LLC | Samuel Alfredo Randazzo | — | (714) 235 7823 | Other | Big Bear City · San Bernardino County | — | — |
| Gruva Painting INC | Perez Rene Valencia | — | (909) 640 8787 | Windows, patio, painters | San Bernardino · San Bernardino County | — | — |
| Gscc Builders INC | Mengge Liu | — | (949) 381 1682 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Gsw Giles Service & Wiring Electrical LLC | Brian Steven Giles | — | (760) 912 4675 | Electricians | Lucerne Valley · San Bernardino County | — | — |
| Gt Builders INC | Julio Caesar Aguilar | — | (909) 921 2247 | GC, remodel, ADU | Hesperia · San Bernardino County | — | — |
| Gt United Imaging & Construction INC DBA Gt United Painting | Dennis Ricardo Matute Lopez | — | (909) 406 1053 | GC, remodel, ADU | Redlands · San Bernardino County | — | — |
| Gtz Builders INC | Benjamin Alejandro Gutierrez | — | (909) 243 9597 | GC, remodel, ADU | Bloomington · San Bernardino County | — | — |
| Guang Jin Li | Guang Jin Li | — | (626) 672 8360 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Guardian Angel Plumbing INC | Angel Mike Acosta Sosa | — | (562) 274 8867 | GC, remodel, ADU | Chino · San Bernardino County | — | — |
| Guardian South INC | Ryan Shilling Camana | — | (760) 789 7190 | Other | Highland · San Bernardino County | — | — |
| Guardiola Wrought Iron | Guardiola Wrought Iron | — | (909) 753 4271 | Other | Hesperia · San Bernardino County | — | — |
| Guenther Woodworks And Stairs | Guenther Woodworks And Stairs | — | (626) 474 0103 | Other | Ontario · San Bernardino County | — | — |
| Guerra's Drywall INC | Hugo Rene Guerra Mazate | guerrasdrywallinc@gmail.com | (909) 761 1858 | Other | Montclair · San Bernardino County | — | — |
| Guerrero Fire Protection INC | Ortiz Antonio Guerrero | — | (626) 201 8207 | Other | Ontario · San Bernardino County | — | — |
| Guevara Egm Flooring | Morga Emanuel Guevara | — | (714) 880 0423 | Other | Chino · San Bernardino County | — | — |
| Guilherme Engineering | Guilherme Engineering | — | (760) 983 0671 | Other | Victorville · San Bernardino County | — | — |
| Guillen Family Plumbing | Roy Guillen-Banuelos | — | (760) 995 1529 | Other | Hesperia · San Bernardino County | — | — |
| Guillermo Jimenez Martinez | Guillermo Jimenez Martinez | — | (909) 496 5068 | Other | Yucaipa · San Bernardino County | — | — |
| Gunby INC | Pete Bruce Gunby | — | (909) 980 8400 | Other roofers | Rancho Cucamonga · San Bernardino County | — | — |
| Gungnir Electric LLC | Charles Tyler Holifield | tyholifield@gungnirelectric.com | (909) 957 7961 | Electricians | Crestline · San Bernardino County | — | — |
| Guodong Zeng | Guodong Zeng | — | (626) 476 3031 | GC, remodel, ADU | Chino Hills · San Bernardino County | — | — |
| Gurley Construction | Jacob Oscar Gurley | — | (909) 224 0634 | GC, remodel, ADU | Rancho Cucamonga · San Bernardino County | — | — |
| Gurrola And Sons Landscaping | Francisco Gurrola | — | (909) 568 6912 | Windows, patio, painters | Upland · San Bernardino County | — | — |
| Gus & Lil General Contractor Corp | Danny Lee Coley | — | (909) 534 9445 | GC, remodel, ADU | Hesperia · San Bernardino County | — | — |
| Gus Electric INC | Gustavo Eduardo Lorenzo | — | (818) 620 2385 | Electricians | Rancho Cucamonga · San Bernardino County | — | — |
| Gus Gonzalez Plumbing Co | Gustavo Oswaldo Gonzalez Mondragon | — | (909) 951 9383 | Other | San Bernardino · San Bernardino County | — | — |
| Gus Mocino Construction | Gustavo Adolfo Mocino | — | (909) 831 7389 | GC, remodel, ADU | Sugarloaf · San Bernardino County | — | — |
| Gustavo Aguayo | Gustavo Aguayo | — | (949) 378 0962 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| Gustavo Rangel | Gustavo Rangel | — | (909) 767 6868 | Other | Alta Loma · San Bernardino County | — | — |
| Gustin's Cabinetry | Gustin's Cabinetry | — | (760) 221 3550 | Other | Hesperia · San Bernardino County | — | — |
| Gutierrez Construction | Lemus Porfirio Rosetti | — | (951) 538 8587 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| Gutierrez Construction R J INC DBA Gutierrez Concrete & Masonry | Rodolfo Jaime Gutierrez | — | (909) 721 3493 | Other | Bloomington · San Bernardino County | — | — |