| A1 Plumbing And Drains | A1 Plumbing And Drains | — | (916) 585 6524 | Other | Sacramento · Sacramento County | — | — |
| A1 Plumbing Solutions | A1 Plumbing Solutions | — | (310) 748 7681 | Other | Harbor City · Los Angeles County | — | — |
| A1 Pool Solutions | Steven Robert Levine | — | (805) 775 7438 | Pool | Port Hueneme · Ventura County | — | — |
| A1 Power Group INC | Alfred Hartoun Estepanian | a1powergroup@gmail.com | (818) 476 2472 | Electricians | Granada Hills · Los Angeles County | — | — |
| A1 Pro Appliance Installation LLC | Jesse Jaron Ramirez | — | (916) 903 9296 | Other | Rancho Cordova · Sacramento County | — | — |
| A1 Pro Painting Corp | Sergio Florez | — | (951) 507 9382 | Windows, patio, painters | Fontana · San Bernardino County | — | — |
| A1 Professional Painting | A1 Professional Painting | — | (559) 644 6048 | Windows, patio, painters | Fresno · Fresno County | — | — |
| A1 Professional Plumbing INC | Gomez Jaime | — | (310) 854 9791 | Other | Inglewood · Los Angeles County | — | — |
| A1 Property Preservation LLC | John James Venner | — | (951) 321 0319 | GC, remodel, ADU | Highland · San Bernardino County | — | — |
| A1 Quality Blinds | Zachary Scott Divine | info@a1qualityblinds.com | (858) 689 9999 | Other | San Diego · San Diego County | — | — |
| A1 Quality Contractor INC | Deshawn Khiry Garcia | a1qualitycontractor.inc@gmail.com | (925) 508 8381 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| A1 Quality Painting | A1 Quality Painting | — | (916) 202 0677 | Windows, patio, painters | Fair Oaks · Sacramento County | — | — |
| A1 Quality Refinishing | A1 Quality Refinishing | info@a1qualityrefinishing.com | (925) 798 1144 | Other | Danville · Contra Costa County | — | — |
| A1 Quality Roofing INC | Armando Esquivel Echevarria | — | (951) 808 4251 | Other roofers | Corona · Riverside County | — | — |
| A1 Rayans General Construction | Narayan Ravind | — | (209) 568 9490 | GC, remodel, ADU | Modesto · Stanislaus County | — | — |
| A1 Ready Construction INC | Hector Antonio Fraire | — | (510) 867 0407 | GC, remodel, ADU | Galt · Sacramento County | — | — |
| A1 Reglazing | Ortiz Ramiro Jimenez | — | (818) 974 9247 | Other | Los Angeles · Los Angeles County | — | — |
| A1 Roofing | Adolfo Alexis Lizaola | — | (916) 459 7008 | Other roofers | Woodland · Yolo County | — | — |
| A1 Septic Services | Christopher Martin Dilling | — | (858) 776 2675 | Other | El Cajon · San Diego County | — | — |
| A1 Sewer Solutions | A1 Sewer Solutions | — | (323) 202 5353 | Other | Los Angeles · Los Angeles County | — | — |
| A1 Shower Pan INC | Armando Molina | — | (619) 247 6906 | Other | Chula Vista · San Diego County | — | — |
| A1 Solar Consulting LLC | Cesar Ivan Izaguirre | — | (888) 993 3354 | Other roofers | Riverside · Riverside County | — | — |
| A1 Standard Electrical | Covarrubias Salvador | — | (747) 309 0217 | Electricians | Winnetka · Los Angeles County | — | — |
| A1 Structural Framing INC | Jose Armando Ceja | — | (747) 235 4009 | Other | Panorama City · Los Angeles County | — | — |
| A1 Sun INC | Joel Benjamin Frangquist | — | (510) 526 5715 | GC, remodel, ADU | Berkeley · Alameda County | — | — |
| A1 Superior Roofing | Silvestre Garcia | — | (424) 477 5260 | Other roofers | Torrance · Los Angeles County | — | — |
| A1 Tile | Jesus Guadalupe Pacheco | — | (323) 283 3869 | Other | Los Angeles · Los Angeles County | — | — |
| A1 Tree Care LLC | Maria Elena Baez | — | (408) 417 7922 | Other | San Jose · Santa Clara County | — | — |
| A1 Valley Construction Services INC | Khanh Quoc Nguyen | — | (559) 217 1436 | GC, remodel, ADU | Fresno · Fresno County | — | — |
| A1 Victor's Tile Company | Victor James Peres | — | (408) 279 2591 | Other | San Jose · Santa Clara County | — | — |
| A1 Volt INC | Larry Thomas Jr Stinson | — | (760) 475 4014 | Electricians | Oak Hills · San Bernardino County | — | — |
| A1 Water Quality | A1 Water Quality | — | (209) 587 1708 | Other | Delhi · Merced County | — | — |
| A1 Welding Services | Adam Daniel Aitchison | — | (707) 373 0096 | Other | American Canyon · Napa County | — | — |
| A1 Yes Construction INC | Simcha Desta | — | (949) 473 0874 | GC, remodel, ADU | Tustin · Orange County | — | — |
| A1-electric | Juan Sebastian De La Vara | — | (209) 595 8783 | Electricians | Salida · Stanislaus County | — | — |
| A1-perez Plumbing Electric & Pipelines | Abel Hector Perez | — | (323) 263 4343 | Electricians | Los Angeles · Los Angeles County | — | — |
| A10 Garage Door And Gates Repair Services | Dvir Berg | — | (206) 565 7271 | Other | San Diego · San Diego County | — | — |
| A100 Percent Guarantee Heating And A/c | Evan Tyler Thompson | — | (707) 689 5128 | HVAC | Vacaville · Solano County | — | — |
| A1a Garage Door Service And Installation | Colin Alexander Thomas | — | (408) 205 5251 | Other | Novato · Marin County | — | — |
| A1ex Tree Service Corp | Jazmin Monserrat Rocha | — | (626) 324 0846 | Tree | Azusa · Los Angeles County | — | — |