| A-1 Fence | Gilberto Ontiveros | — | (714) 630 3390 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A-1 Fire Protection INC | Jill Elizabeth Mc Carty | — | (858) 623 2733 | Other | San Diego · San Diego County | — | — |
| A-1 Fire Protection Services INC | Doyle Delon Muhammad | — | (925) 305 5884 | Other | Oakley · Contra Costa County | — | — |
| A-1 Flooring Pro | A-1 Flooring Pro | — | (408) 829 1152 | Other | San Jose · Santa Clara County | — | — |
| A-1 Gate & Entry | A-1 Gate & Entry | — | (818) 363 7065 | Other | Mission Hills · Los Angeles County | — | — |
| A-1 Gates & Access INC | Katav Maayan | — | (800) 570 1277 | Other | San Jose · Santa Clara County | — | — |
| A-1 Glass | A-1 Glass | — | (805) 227 6697 | Windows, patio, painters | Paso Robles · San Luis Obispo County | — | — |
| A-1 Glaswindor Industries INC | Jose Del Gallego Payawal | — | (408) 263 8791 | Windows, patio, painters | Fremont · Alameda County | — | — |
| A-1 Green Construction | Gevorg Keshishyan | — | (818) 929 8526 | GC, remodel, ADU | Granada Hills · Los Angeles County | — | — |
| A-1 Guarantee Roofing INC | Ray Curtis Rudy | — | (805) 407 8151 | Other roofers | Oxnard · Ventura County | — | — |
| A-1 Guaranteed Heating & Air Conditioning INC | Richard William Hiteshew | — | (707) 645 0734 | HVAC | Vallejo · Solano County | — | — |
| A-1 Gutter Guys | Anthony Edward Gardner | — | (408) 490 4326 | Other | Santa Clara · Santa Clara County | — | — |
| A-1 Hauling | A-1 Hauling | — | (408) 605 4224 | Other | San Jose · Santa Clara County | — | — |
| A-1 Hawkins Construction INC | Dillon Earl Hawkins | — | (530) 903 1483 | GC, remodel, ADU | Placerville · El Dorado County | — | — |
| A-1 Heating And Cooling INC | Kimberle Ann| Gentile Kimberly Ann Gentile | — | (408) 283 9915 | HVAC | San Jose · Santa Clara County | — | — |
| A-1 Home Repair & Construction Company | Anthony Eugene Feliciano | — | (831) 521 1671 | GC, remodel, ADU | Seaside · Monterey County | — | — |
| A-1 Janitorial Services | Jesse Osvaldo Rivera | — | (209) 204 5312 | Other | Patterson · Stanislaus County | — | — |
| A-1 Land Management INC | Ronald Lee Nichols | — | (209) 736 6786 | Tree | Angels Camp · Calaveras County | — | — |
| A-1 Landscape Contractors | Gary Earl Mc Corkle | — | (562) 824 2161 | Windows, patio, painters | Long Beach · Los Angeles County | — | — |
| A-1 Lock And Safe | A-1 Lock And Safe | — | (760) 431 5397 | Other | Carlsbad · San Diego County | — | — |
| A-1 Manteq Electronic Systems INC | Martin Marian Radu | — | (949) 433 0306 | Electricians | Costa Mesa · Orange County | — | — |
| A-1 Modular INC | Jose Salvador Ramirez | marketing@a-modular.com | (510) 999 7721 | Electricians | San Leandro · Alameda County | — | — |
| A-1 Ocean Breeze INC | William Louis Marcus | — | (661) 252 6800 | HVAC | Canyon Country · Los Angeles County | — | — |
| A-1 Pacific Tree Maintenance | A-1 Pacific Tree Maintenance | — | (661) 755 4949 | Tree | Palmdale · Los Angeles County | — | — |
| A-1 Painting | A-1 Painting | — | (209) 526 6959 | Windows, patio, painters | Ceres · Stanislaus County | — | — |
| A-1 Painting Concepts | A-1 Painting Concepts | — | (714) 292 2953 | GC, remodel, ADU | Fullerton · Orange County | — | — |
| A-1 Painting Concepts INC | Wang Sik Lim | — | (714) 879 4000 | GC, remodel, ADU | Anaheim · Orange County | — | — |
| A-1 Painting INC | Daniel Dwight Buss | — | (650) 589 8347 | Windows, patio, painters | South San Francisco · San Mateo County | — | — |
| A-1 Pest Management | A-1 Pest Management | — | (805) 460-7566 | Pest, tile roofs | Atascadero · San Luis Obispo County | — | — |
| A-1 Plastics Incorporated | James Elde Jr Blakemore | — | (619) 444 9442 | Other | El Cajon · San Diego County | — | — |
| A-1 Plumbing | A-1 Plumbing | — | (209) 541 4540 | Other | Modesto · Stanislaus County | — | — |
| A-1 Plumbing Company | Barragan Francisco Chavez | — | (209) 430 2730 | Other | Stockton · San Joaquin County | — | — |
| A-1 Plumbing Heating & Air Conditioning Services | Jason Howard Lischke | — | (866) 755 0470 | HVAC | Sherman Oaks · Los Angeles County | — | — |
| A-1 Plumbing Service | Richard Anthony Romo | — | (661) 376 3327 | GC, remodel, ADU | Bakersfield · Kern County | — | — |
| A-1 Pool Service | Barry Louis Brodeur | — | (916) 331 4048 | Pool | Antelope · Sacramento County | — | — |
| A-1 Premier Landscaping INC | Pedro Joel Rodriguez Arreola | — | (323) 392 6775 | Windows, patio, painters | Roseville · Placer County | — | — |
| A-1 Pro Construction LLC | Nicklesh Avtar Johal | — | (925) 236 0776 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| A-1 Pro Demo | Alvaro Daniel Pacheco | — | (916) 906 3920 | GC, remodel, ADU | Sacramento · Sacramento County | — | — |
| A-1 Pumpcrete INC | Tim Shawn Regan | — | (619) 206 7867 | Other | Poway · San Diego County | — | — |
| A-1 Quality Construction | Frank Bremmett Payton | — | (408) 836 6866 | GC, remodel, ADU | San Jose · Santa Clara County | — | — |