| A1 Best Plumbing & Restoration | Vincent Joseph Attardo | — | (562) 981 2636 | GC, remodel, ADU | Signal Hill · Los Angeles County | — | — |
| A1 Blasting INC DBA A1 Coatings | Florentino Jr Sandoval | — | (559) 217 8124 | Other | Fresno · Fresno County | — | — |
| A1 Blasting INC DBA A1 Trash Haul | Florentino Jr Sandoval | — | (559) 217 8124 | Other | Fresno · Fresno County | — | — |
| A1 Building Contractor | A1 Building Contractor | — | (916) 847 1671 | GC, remodel, ADU | Granite Bay · Placer County | — | — |
| A1 Builds INC | Garcia Aaron Ramon | — | (510) 606 2398 | GC, remodel, ADU | Hayward · Alameda County | — | — |
| A1 Carpet Market | Mhd Radwan Jaboulie | — | (818) 905 0500 | Other | Encino · Los Angeles County | — | — |
| A1 Construction | Chong Ki Yi | — | (213) 222 5552 | GC, remodel, ADU | Los Angeles · Los Angeles County | — | — |
| A1 Construction | Beltran Alex | info@a1construction.com | (800) 220 0209 | GC, remodel, ADU | San Bernardino · San Bernardino County | — | — |
| A1 Construction & Remodeling | A1 Construction & Remodeling | — | (559) 664-8664 | GC, remodel, ADU | Madera · Madera County | — | — |
| A1 Construction & Remodeling INC | Tony Kohani | — | (818) 620 8187 | GC, remodel, ADU | Sherman Oaks · Los Angeles County | — | — |
| A1 Construction And Restoration INC | Iurii Zharkov | — | (951) 712 4722 | GC, remodel, ADU | Beverly Hills · Los Angeles County | — | — |
| A1 Construction Group Corporation | Adam Romuald Lesny | — | (415) 722 8774 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| A1 Custom Painting | A1 Custom Painting | — | (760) 464 9807 | Windows, patio, painters | La Quinta · Riverside County | — | — |
| A1 Earthworks | A1 Earthworks | — | (760) 596 9312 | Other | Pinon Hills · San Bernardino County | — | — |
| A1 Electric | Soghomonyan Senik | — | (818) 649 4637 | Electricians | Glendale · Los Angeles County | — | — |
| A1 Elite Air Condition INC | Roy Dror Yehoshua | — | (818) 326 3399 | HVAC | Woodland Hills · Los Angeles County | — | — |
| A1 Factory Direct Flooring | A1 Factory Direct Flooring | — | (760) 741-6470 | Windows, patio, painters | San Marcos · Madera County | — | — |
| A1 Fire Sprinkler LLC | Sterling John Brower | — | (310) 619 1552 | Other | Reseda · Los Angeles County | — | — |
| A1 Flooring | Foumani Maskan Mahchid Ansary | — | (818) 668 7419 | GC, remodel, ADU | Thousand Oaks · Ventura County | — | — |
| A1 Flooring INC | Gonzalo Jr Moran | — | (562) 370 5850 | Other | Huntington Park · Los Angeles County | — | — |
| A1 Gutierrez Construction | Gutierrez Medina Alfredo | — | (510) 576 9243 | GC, remodel, ADU | Castro Valley · Alameda County | — | — |
| A1 Hardwood Flooring LLC | Petr Hilek | — | (949) 433 4949 | Other | Anaheim · Orange County | — | — |
| A1 Home Builder | A1 Home Builder | — | (747) 324 0595 | Electricians | Palmdale · Los Angeles County | — | — |
| A1 Home Remodeling INC | Izakellian David | — | (310) 980 0662 | GC, remodel, ADU | Reseda · Los Angeles County | — | — |
| A1 Home Roofing | Fariborz Ghorban | — | (800) 450 7165 | Other roofers | Orinda · Contra Costa County | — | — |
| A1 HVAC Crew INC | Hector Hugo Diaz Gomez | — | (562) 578 8184 | HVAC | Whittier · Los Angeles County | — | — |
| A1 Industrial Heating & Cooling | A1 Industrial Heating & Cooling | — | (310) 699 9713 | HVAC | Los Angeles · Los Angeles County | — | — |
| A1 Industrial Maintenance | Scott Paul Jr Etter | — | (760) 927 2786 | Other | Lucerne Valley · San Bernardino County | — | — |
| A1 International Tv Sales & Service INC DBA Nuvision Construction | Zafer Khalil Bayaa | — | (714) 544 6961 | GC, remodel, ADU | Tustin · Orange County | — | — |
| A1 Landscaping | A1 Landscaping | — | (209) 720 6830 | Windows, patio, painters | Merced · Merced County | — | — |
| A1 Landscaping & Yard Maintenance LLC | Maymal Jeet Singh | — | (530) 304 2534 | Windows, patio, painters | Woodland · Yolo County | — | — |
| A1 Maintenance & Construction Corp | Jacob Daniel Chagolla | — | (951) 518 2415 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| A1 Maintenance LLC | Luis Roberto Zarate | enquiries@a1maintenance.com | (707) 563 7066 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| A1 Metropolitan Construction INC | Fernando Luis Guzman | info@indiantypefoundry.com | (559) 497 5622 | GC, remodel, ADU | Fresno · Fresno County | — | — |
| A1 Oros Plumbing | A1 Oros Plumbing | — | (619) 962 6941 | Other | Chula Vista · San Diego County | — | — |
| A1 Outdoor Living | Alexis Natividad Hernandez Martinez | — | (510) 200 4064 | Windows, patio, painters | Modesto · Stanislaus County | — | — |
| A1 Painting | A1 Painting | a1painting2004@yahoo.com | (925) 956 3744 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| A1 Painting | A1 Painting | a1painting2004@yahoo.com | (510) 825 3799 | Windows, patio, painters | Patterson · Stanislaus County | — | — |
| A1 Painting Service | Astley Alexander Machuca | — | (310) 755 5158 | Windows, patio, painters | Whittier · Los Angeles County | — | — |
| A1 Phoenix Plumbing INC | James Ray Warford | info@a1phoenixplumbing.com | (925) 380 1114 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |