| 3D Concrete | 3D Concrete | — | (562) 244 3923 | Other | Bellflower · Los Angeles County | — | — |
| 3D Construction | Keshishian Ara | — | (661) 203 2308 | GC, remodel, ADU | Glendale · Los Angeles County | — | — |
| 3D Construction | Christopher Michael Moore | — | (530) 604 9593 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| 3D Construction | Sargsyan Khachatur | — | (559) 273 0770 | GC, remodel, ADU | Clovis · Fresno County | — | — |
| 3D Construction And Landscaping | Daniel Jr Aguirre | — | (661) 578 8381 | GC, remodel, ADU | Bakersfield · Kern County | — | — |
| 3D Contractors INC | Daniel Virgen-Vazquez | — | (323) 714 5886 | GC, remodel, ADU | Commerce · Los Angeles County | — | — |
| 3D Diaz Painting LLC | Jacqueline Diaz | — | (408) 483 3033 | Windows, patio, painters | Tracy · San Joaquin County | — | — |
| 3D Door Designs | 3D Door Designs | — | (209) 879 9153 | Other | Riverbank · Stanislaus County | — | — |
| 3D Electric | Domingo John | — | (408) 834 2953 | Electricians | San Jose · Santa Clara County | — | — |
| 3D Floors | Ulises Daniel Alvarado Cuenca | — | (909) 758 3042 | Other | Moreno Valley · Riverside County | — | — |
| 3D Glass Design LLC | Douglas Dean Dawson | — | (805) 861 0393 | Windows, patio, painters | Ventura · Ventura County | — | — |
| 3D Heating And Air LLC | Donald Victor Williams | — | (916) 820 6500 | HVAC | Sacramento · Sacramento County | — | — |
| 3D Painting | 3D Painting | — | (805) 260 0864 | Windows, patio, painters | Santa Maria · Santa Barbara County | — | — |
| 3D Plumbing | 3D Plumbing | — | (805) 315 3025 | Other | Santa Maria · Santa Barbara County | — | — |
| 3D Remodeling & Construction | Brady Tingyang Yu | — | (510) 207 8694 | GC, remodel, ADU | San Leandro · Alameda County | — | — |
| 3D Remodeling INC | James Randall Kens Alexander | sales@3dremodeling.com | (925) 525-0708 | GC, remodel, ADU | Livermore · Alameda County | — | — |
| 3D Signs LLC | Keping Jiang | — | (510) 918 8129 | Other | San Leandro · Alameda County | — | — |
| 3D Stairs | 3D Stairs | — | (909) 749 1757 | Other | Adelanto · San Bernardino County | — | — |
| 3D Studio INC DBA Joseph Farais | Joseph Patrick Farais | — | (510) 220 0220 | Other | Oakland · Alameda County | — | — |
| 3D Technical Services INC | Daniel Timothy Farley | — | (925) 691 5543 | Electricians | Clayton · Contra Costa County | — | — |
| 3D Technology Services INC | Jeffrey Paul Thomson | — | (916) 859 9111 | Electricians | Rancho Cordova · Sacramento County | — | — |
| 3D Tile | 3D Tile | — | (209) 304 7034 | Other | Cool · El Dorado County | — | — |
| 3daysgc LLC | Angel Francisco Salcido Reyna | — | (909) 732 6281 | GC, remodel, ADU | Claremont · Los Angeles County | — | — |
| 3dl Forever Flooring INC | De Leon Daniel Diaz | — | (619) 292 5570 | Other | Spring Valley · San Diego County | — | — |
| 3ds Marble & Tile INC | Edvin Antonio Chacon Alvarez | — | (323) 719 5727 | GC, remodel, ADU | Simi Valley · Ventura County | — | — |
| 3dscapes | Michael Andrew Perez | — | (559) 799 6441 | Windows, patio, painters | Visalia · Tulare County | — | — |
| 3dxit Construction | Ricardo Castorena | — | (909) 262 4057 | GC, remodel, ADU | Fontana · San Bernardino County | — | — |
| 3E Air INC | Jose Enrique Navarro | — | (559) 936 9430 | HVAC | Tulare · Tulare County | — | — |
| 3E Construction LLC | Scott Gregory Sepulveda | — | (805) 610 9031 | Other | Paso Robles · San Luis Obispo County | — | — |
| 3E INC | Darrin Wayne Eaves | — | (530) 845 8507 | Windows, patio, painters | Yuba City · Sutter County | — | — |
| 3E Painting And Custom Refinishing INC | Rosa Alva Bernardi | — | (714) 343 4011 | Windows, patio, painters | Long Beach · Los Angeles County | — | — |
| 3G Builders And Renovation | Joseph Von Edward Guthrie | — | (925) 497 0833 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| 3G Carpentry INC | Gregory Gordon Govan | — | (831) 566 3719 | GC, remodel, ADU | Santa Cruz · Santa Cruz County | — | — |
| 3G Electric | Camacho Villarreal Gildardo | — | (323) 504 3299 | Electricians | Los Angeles · Los Angeles County | — | — |
| 3G Electric | Chad Steven Gaytan | — | (916) 461 9009 | Electricians | Lincoln · Placer County | — | — |
| 3G Engineering Corp | Jose Adolfo Gastelo Pimentel | — | (619) 495 6442 | Other | Spring Valley · San Diego County | — | — |
| 3G Flooring Solutions | 3G Flooring Solutions | — | (209) 252 2100 | Other | Crows Landing · Stanislaus County | — | — |
| 3G General Construction | Rodriguez Manuel Gonzalez | — | (424) 264 7058 | GC, remodel, ADU | Lancaster · Los Angeles County | — | — |
| 3G Landscape LLC | Diego Quintero Garcia | — | (510) 387 9996 | Windows, patio, painters | Fairfield · Solano County | — | — |
| 3G Plumbing | 3G Plumbing | — | (510) 480 9844 | Other | San Pablo · Contra Costa County | — | — |