| Apex Roofing Solutions | Mark Anthony Ramirez | — | (442) 400 0706 | Other roofers | Cathedral City · Riverside County | — | — |
| Apex Roofing Works & Maintenance Solutions LLC | Joel Emmanuel Duenas | — | (909) 282 5039 | Other roofers | Murrieta · Riverside County | — | — |
| Apex Synthetic Caulking Solutions | Apex Synthetic Caulking Solutions | — | (714) 231 0049 | Other | Murrieta · Riverside County | — | — |
| Apex Woodworks | Apex Woodworks | — | (442) 599 8653 | Other | Indio · Riverside County | — | — |
| Apg Painting LLC | Sally Ann Gjeloshaj | — | (951) 249 1828 | Windows, patio, painters | Canyon Lake · Riverside County | — | — |
| Apollo Electric Co | Robert Franklin Jr Judy | chrischatzis@gmail.com | (801) 554-3344 | Electricians | Homeland · Riverside County | — | — |
| Apple J Plumbing INC | Jeffrey Nicholus Apple | — | (760) 347 0049 | Other | Palm Desert · Riverside County | — | — |
| Applied Perfection Painting | Applied Perfection Painting | — | (951) 265 9711 | Windows, patio, painters | Anza · Riverside County | — | — |
| Approved Fire Pumps INC | Robert Glenn Caputo | — | (951) 738 9100 | Other | Corona · Riverside County | — | — |
| Apricot Construction Corp | Peter Palacios | — | (323) 677 8418 | Electricians | Lake Elsinore · Riverside County | — | — |
| Aps Electrical Service | Anthony Patrick Spinuzzi | — | (909) 466 1200 | Electricians | Menifee · Riverside County | — | — |
| Aqua - Metric Sales Company | Jefferi Micheal Ogburn | — | (951) 637 1400 | Other | Riverside · Riverside County | — | — |
| Aqua Backflow And Chlorination INC | Christopher Howell Spaulding | — | (909) 598 7251 | Other | Riverside · Riverside County | — | — |
| Aqua Blue Plumbing | Aqua Blue Plumbing | — | (571) 435 5496 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Aqua Care Pools | Ryan Lee Martineau | — | (951) 313 7717 | Pool | Riverside · Riverside County | — | — |
| Aqua Clear Pool Service | Robert William Ainsworth | — | (760) 601 6433 | Pool | Palm Desert · Riverside County | — | — |
| Aqua Clear Pools And Spas INC | Victor Manuel Calixto Rocha | — | (760) 320 3260 | Pool | Palm Springs · Riverside County | — | — |
| Aqua Flow Incorporated | Philip Mathew Gray | — | (951) 232 9560 | Other | Nuevo · Riverside County | — | — |
| Aqua Hills | Aqua Hills | — | (951) 279 4243 | Other | Corona · Riverside County | — | — |
| Aqua Oasis Pools & Spas | Aqua Oasis Pools & Spas | — | (951) 475 0120 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Aqua Plumbing Corp | Javier Salcedo | — | (951) 943 4600 | Other | Romoland · Riverside County | — | — |
| Aqua Pros Pool Care & Repair | Lee Joseph Ratti | — | (951) 768 8916 | Pool | Corona · Riverside County | — | — |
| Aqua Splash INC | Larry Dean Webber | — | (909) 887 1224 | GC, remodel, ADU | Mira Loma · Riverside County | — | — |
| Aqua System Pool And Spa Repair LLC | Blake Gerald Glinski | — | (949) 636 2142 | Pool | Temecula · Riverside County | — | — |
| Aqua Terra | Aqua Terra | hello@aqua-terra.com | (858) 309 4392 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| Aqua Vision | Aqua Vision | — | (760) 340 9335 | Windows, patio, painters | Palm Desert · Riverside County | — | — |
| Aqua Works | Aqua Works | — | (951) 652 0580 | Other | Hemet · Riverside County | — | — |
| Aquadestiny Construction | Nicholas Daniel Negrete | — | (760) 459 1125 | GC, remodel, ADU | Indio · Riverside County | — | — |
| Aquapool Pool Maintenance And Repair | Adam Lane Johnson | — | (760) 238 2782 | Pool | Thousand Palms · Riverside County | — | — |
| Aquarius Pool Service | Colbey Paul Phipps | — | (951) 415 1871 | Pool | San Jacinto · Riverside County | — | — |
| Aquascapes INC | Richard Allen Zembrzuski | — | (951) 735 5515 | Pool | Corona · Riverside County | — | — |
| Aquatech Pools INC | Kevin Jose Lopez Ramirez | — | (760) 464 5266 | Pool | Palm Springs · Riverside County | — | — |
| Aquaterra Pool Construction | Liliana Marieta Raygada | — | (760) 250 8897 | Pool | Palm Desert · Riverside County | — | — |
| Aquawolf Pools | Anthony Rudy Garcia | — | (714) 398 2529 | Pool | Norco · Riverside County | — | — |
| Ar Builder LLC | Ruiz Albaro | — | (442) 306 8652 | GC, remodel, ADU | Thermal · Riverside County | — | — |
| Ar Construction Services | Ruiz Albert | — | (951) 315 7856 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Ar Electric Shop INC | Aron Joseph Rose | — | (760) 450 6429 | Electricians | Murrieta · Riverside County | — | — |
| Ar Landscaping | Ar Landscaping | — | (760) 703 1830 | Windows, patio, painters | Menifee · Riverside County | — | — |
| Ar Metal Works INC | Fredy Giovany Bueso Ramirez | — | (951) 205 6185 | Other | Riverside · Riverside County | — | — |
| Araki & Associates INC | June Hane Mulleneaux | — | (760) 799 1201 | GC, remodel, ADU | Palm Desert · Riverside County | — | — |