| Antonio Rojas Construction | Rojas Antonio | — | (310) 413 2185 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Antonio Rosales DBA Rosales Bejar Construction | Rosales Antonio | — | (909) 223 1196 | GC, remodel, ADU | San Jacinto · Riverside County | — | — |
| Antonio's Garage Doors | Antonio's Garage Doors | — | (951) 694 2899 | Other | San Jacinto · Riverside County | — | — |
| Antonio's Landscaping | Antonio's Landscaping | — | (760) 464 7666 | Windows, patio, painters | Desert Hot Springs · Riverside County | — | — |
| Antunez Electrical Industries INC | Manuel Barrera Antunez | — | (951) 741 6938 | Electricians | Riverside · Riverside County | — | — |
| Any Degree Refrigeration Heating & Air INC | Majid Ahmad El-saeh | — | (951) 234 2444 | HVAC | Murrieta · Riverside County | — | — |
| Anytime Electric | David Edward Jodoin | — | (714) 345 6475 | Electricians | Murrieta · Riverside County | — | — |
| Anytime Tree Service INC | Gonzalo Perez | — | (951) 443 4540 | Tree | Perris · Riverside County | — | — |
| Anza Valley Backhoe Service | Clarence Calvin Jr Phillips | — | (951) 760 6248 | Other | Anza · Riverside County | — | — |
| Anza Valley Welding & Fabrication INC | Dustin Duane Bradley-Reno | — | (760) 500 3217 | Other | Anza · Riverside County | — | — |
| Ao Construction | Adalberto Obregon | admin@aoconstruction.com | (619) 206 7522 | GC, remodel, ADU | Lake Elsinore · Riverside County | — | — |
| Ao Electric | Olariu Andrei | — | (949) 228 7421 | Electricians | Menifee · Riverside County | — | — |
| Aos All Out Services HVAC | Eric Lawvan Barner | — | (714) 420 1516 | HVAC | Perris · Riverside County | — | — |
| Ap Bros Plumbing Co | Bojorquez Antonio Padilla | — | (951) 463 9871 | Other | Corona · Riverside County | — | — |
| Ap Cal Builders Service | Francisco Arturo Aviles Quincosa | — | (323) 513 6911 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Ap Concrete INC | Abidan Padilla | — | (951) 742 6576 | Other | Moreno Valley · Riverside County | — | — |
| Ap Electric | Adalberto Jesus Perez | — | (562) 565 0178 | Electricians | Riverside · Riverside County | — | — |
| Ap Electrical Services INC | Anthony Amante Pagdilao | — | (951) 999 1908 | Electricians | Beaumont · Riverside County | — | — |
| Ap Professional Builders | Espinoza Salvador Ponce | — | (714) 659 3447 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Ap's Tile | Ap's Tile | — | (951) 616 9869 | Other | Menifee · Riverside County | — | — |
| Ap1 Plastering & Stucco Repair | Plascencia Adrian | — | (951) 907 6957 | Other | Riverside · Riverside County | — | — |
| Apac4k INC | Mandeep Singh | — | (714) 240 3841 | Other | Corona · Riverside County | — | — |
| Apache West Homes & Construction | Jock Gerard Beazley | — | (909) 238 8817 | GC, remodel, ADU | Moreno Valley · Riverside County | — | — |
| Aparicio Co | Jose Luis Aparicio | — | (951) 656 2299 | Other | Moreno Valley · Riverside County | — | — |
| Apcs INC | Escobedo Erick Sosa | — | (951) 230 6839 | GC, remodel, ADU | Nuevo · Riverside County | — | — |
| Apes Plumbing Heating Sewer & Drain Services | Apes Plumbing Heating Sewer & Drain Services | — | (707) 321-6815 | HVAC | Sonoma · Riverside County | — | — |
| Apex A H R Co | Young Dal Lee | — | (951) 333 5252 | HVAC | Riverside · Riverside County | — | — |
| Apex Comercial Service | Rodolfo Ruben Roos | — | (951) 340 3235 | HVAC | Norco · Riverside County | — | — |
| Apex Commercial Services INC | James Roger Cook | — | (951) 543 5731 | HVAC | Sun City · Riverside County | — | — |
| Apex Construction | Shaun Keith Anvick | — | (909) 456 4486 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| Apex Electric | Glenn Dale Clark | — | (909) 709 7245 | Electricians | Canyon Lake · Riverside County | — | — |
| Apex Flooring Installation LLC | Walter James Jr Menini | — | (760) 427 3218 | Other | Indio · Riverside County | — | — |
| Apex Framing LLC | Julio Jr Infante | — | (760) 625 4410 | Other | Indio · Riverside County | — | — |
| Apex Glazing Installation LLC | Salvador Macias | — | (760) 780 6869 | Windows, patio, painters | Thousand Palms · Riverside County | — | — |
| Apex Landscape Innovations | Apex Landscape Innovations | — | (951) 999 2150 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Apex Plumbing Incorporated | Gustavo Alfredo Castellanos | — | (951) 442 7651 | Other | Perris · Riverside County | — | — |
| Apex Plumbing Services INC | Danny Wayne Jr Parker | — | (951) 942 2739 | Other | Wildomar · Riverside County | — | — |
| Apex Pro Construction INC | Alberto Ramirez Hernandez | — | (951) 480 6509 | GC, remodel, ADU | Winchester · Riverside County | — | — |
| Apex Recreational Construction INC | Alvaro Partida Vasquez | — | (951) 532 3547 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Apex Roofing Company INC | Luis Lopez Lopez | info@apexroofing.com | (951) 637 5534 | Other roofers | Riverside · Riverside County | — | — |