| 1-way Landscape INC | Gutierrez Hugo | — | (562) 522 5294 | Windows, patio, painters | Long Beach · Los Angeles County | — | — |
| 10 Gauge Sheet Metal INC | Grant Wayne Grafius | — | (909) 560 7055 | Other roofers | Upland · San Bernardino County | — | — |
| 10 Points Construction INC | Oscar Isaias Panameno | — | (310) 261 0063 | GC, remodel, ADU | Bellflower · Los Angeles County | — | — |
| 10 Star Development Group INC | Rudy Anthony Lopez | — | (669) 900 3946 | GC, remodel, ADU | Hollister · San Benito County | — | — |
| 10 Star Electric | Jose Luis Arana | — | (408) 807 5418 | Electricians | San Jose · Santa Clara County | — | — |
| 10-4 Millwork | Roger De Castro Ferreira | — | (650) 863 2333 | Other | San Mateo · San Mateo County | — | — |
| 10-4 Plumbing INC | Lopez Juan Davila | — | (951) 692 6355 | Other | Cherry Valley · Riverside County | — | — |
| 100 Degree Mechanical | 100 Degree Mechanical | — | (209) 278 7271 | HVAC | Stockton · San Joaquin County | — | — |
| 100X Construction | Paul Mehrshahi | — | (818) 334 9232 | Electricians | Irvine · Orange County | — | — |
| 101 AC & Heating INC | Eugene Andrew Ayala | — | (805) 746 8582 | HVAC | Oxnard · Ventura County | — | — |
| 101 Builders INC | Antoinette Rose Schreder | — | (408) 842 3355 | GC, remodel, ADU | Gilroy · Santa Clara County | — | — |
| 101 Cast Stone | 101 Cast Stone | sales@caststone.com | (805) 610 9278 | Other | Atascadero · San Luis Obispo County | — | — |
| 101 Concrete Company | Anguiano Isidro Torres | — | (805) 814 5379 | Other | Oxnard · Ventura County | — | — |
| 101 Concrete Services | Perez Humberto Rodriguez | — | (707) 344 2214 | Other | Bay Point · Contra Costa County | — | — |
| 101 Construction | Kelly Kathleen| Ridge Kelly Kathleen Ridge-plascencia | — | (818) 879 6160 | Electricians | Westlake Village · Ventura County | — | — |
| 101 Electric INC | Kelly Kathleen Ridge-Plascencia | — | (818) 879 6160 | Electricians | Westlake Village · Ventura County | — | — |
| 101 Electrical Solutions INC | Chad Lee Loera-Benefield | — | (805) 765 5065 | Electricians | Oxnard · Ventura County | — | — |
| 101 Excavating LLC | James Mark Scobie | — | (805) 610 5161 | Other | Templeton · San Luis Obispo County | — | — |
| 101 Glass & Mirror | 101 Glass & Mirror | — | (805) 247 1100 | Windows, patio, painters | Oxnard · Ventura County | — | — |
| 101 Group Remodeling | Andrei Koshtur | — | (347) 410 2830 | GC, remodel, ADU | Encino · Los Angeles County | — | — |
| 101 Hardwood Flooring | 101 Hardwood Flooring | — | (760) 450 7429 | Other | Carlsbad · San Diego County | — | — |
| 101 Hauling Corp | Sanchez Christopher | — | (707) 500 2100 | GC, remodel, ADU | Rohnert Park · Sonoma County | — | — |
| 101 Hauling Services | Abrahan Rodolfo Jaimes Duarte | — | (408) 874 5132 | Other | San Jose · Santa Clara County | — | — |
| 101 Home Builders INC | James David Sansom | — | (818) 266 4211 | GC, remodel, ADU | Van Nuys · Los Angeles County | — | — |
| 101 Landscape & Design INC | Seung In Hwang | — | (408) 269 0101 | Windows, patio, painters | San Jose · Santa Clara County | — | — |
| 101 Mobility | Raul Emmanuel Navarro | — | (650) 614 1533 | GC, remodel, ADU | Burlingame · San Mateo County | — | — |
| 101 Mobility Of San Diego | Todd Robert Girouard | — | (858) 800 2820 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| 101 Paving Company | Francisco Xaiver Pelayo | — | (818) 370 4281 | Other | Littlerock · Los Angeles County | — | — |
| 101 Plumbing | 101 Plumbing | — | (805) 835 9807 | Other | Paso Robles · San Luis Obispo County | — | — |
| 101 Plumbing & Rooter | Marco Antonio Chavolla | — | (213) 393 8908 | Other | Los Angeles · Los Angeles County | — | — |
| 101 Plumbing Heating And Cooling | Felix De Jesus Gonzalez Escobar | — | (415) 488 7021 | HVAC | Novato · Marin County | — | — |
| 101 Plumbing Humboldt INC | Isaac Arizona Kennedy | — | (707) 498 2707 | Other | Eureka · Humboldt County | — | — |
| 101 Plumbing INC | Juan Hernandez Nunez | — | (805) 570 9816 | Other | Santa Barbara · Santa Barbara County | — | — |
| 101 Plumbing Repair Service | Jason Michael Turnidge | — | (805) 258 6458 | Other | Ventura · Ventura County | — | — |
| 101 Plumbing Solutions | Francisco Javier Zaragoza | — | (415) 377 6939 | Other | Petaluma · Sonoma County | — | — |
| 101 Pro Painting | 101 Pro Painting | — | (951) 391 2414 | Windows, patio, painters | Frazier Park · Kern County | — | — |
| 101 Refrigeration Service | Ahmadie Atef | — | (415) 755 3168 | HVAC | San Rafael · Marin County | — | — |
| 101 Remodeling | Jian Quan Li | — | (916) 648 1388 | GC, remodel, ADU | Sacramento · Sacramento County | — | — |
| 101 Roofing & Construction INC | Nicholas Matthew Ciari | — | (805) 302 9951 | Other roofers | Oxnard · Ventura County | — | — |
| 101 Seamless Gutters INC | George Eugene Angell | — | (707) 566 9113 | Other | Santa Rosa · Sonoma County | — | — |