| A O West Contracting INC | Alphonso Olmos | — | (951) 741 1413 | GC, remodel, ADU | Corona · Riverside County | — | — |
| A One Fence/gate Repair | A One Fence/gate Repair | — | (951) 256 6384 | Other | Corona · Riverside County | — | — |
| A P Cottam Co | Anthony B Cottam | — | (619) 665 5151 | GC, remodel, ADU | Rancho Mirage · Riverside County | — | — |
| A P Franco Construction | Andrew Peter Franco | — | (714) 915 2334 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| A P Mobile Home Improvements | A P Mobile Home Improvements | — | (951) 282 1480 | Other | Menifee · Riverside County | — | — |
| A P S Construction INC | Adel Awad Saad | — | (818) 641 9221 | HVAC | Riverside · Riverside County | — | — |
| A Pilotte Construction | Albert Joseph Pilotte | — | (619) 455 5097 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| A Plus Cabinets INC | Rhett Gordon Ferrell | — | (760) 322 5262 | Other | Indio · Riverside County | — | — |
| A Plus Concrete INC | Annamarie Luisa Perez | — | (951) 471 5465 | Other | Wildomar · Riverside County | — | — |
| A Plus Construction | Rujoie Ali Reza | — | (310) 663 5998 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| A Plus Electric Service LLC | Tobias Nino Romero | — | (760) 459 9711 | Electricians | Cathedral City · Riverside County | — | — |
| A Plus Landscape Service | Petra Guadalupe Mendoza | — | (951) 657 6028 | Windows, patio, painters | Perris · Riverside County | — | — |
| A Plus Landscape Service INC | Petra Guadalupe Mendoza | — | (951) 657 6028 | Windows, patio, painters | Perris · Riverside County | — | — |
| A Plus Painting | Torres Juan Barrera | — | (619) 381 4742 | Windows, patio, painters | Hemet · Riverside County | — | — |
| A Plus Window Sales And Installation | Randall Scott Jemiola | — | (951) 757 2908 | GC, remodel, ADU | Temecula · Riverside County | — | — |
| A Q H I INC | Alin Paris | — | (909) 989 3444 | Other | Corona · Riverside County | — | — |
| A Quality Heating & Air Conditioning INC | Ahmad Said Ali Ammar | — | (714) 507 8949 | HVAC | Riverside · Riverside County | — | — |
| A R C Concrete | A R C Concrete | — | (760) 423 9809 | Other | Cathedral City · Riverside County | — | — |
| A R G Construction & General Contractor INC | Raul Garcia Arias | — | (951) 361 2704 | GC, remodel, ADU | Mira Loma · Riverside County | — | — |
| A R H Lacquer & Custom Coatings | Allen Roy Hapak | — | (858) 449 4712 | Windows, patio, painters | Temecula · Riverside County | — | — |
| A R Lathing Co | Anthony Jimmy Romero | — | (909) 376 5140 | Other | Riverside · Riverside County | — | — |
| A R Pool Plumbing | A R Pool Plumbing | — | (951) 532 1639 | Other | Corona · Riverside County | — | — |
| A R S Construction INC | Manuel Alejandro Sanchez Barajas | — | (855) 810 8118 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| A Reemdy Rooter & Plumbing INC | Arlene Bacio March | — | (951) 272 8966 | Other | Corona · Riverside County | — | — |
| A Reliance Communication Company | Dartagnan Michael Dueball | — | (951) 675 0783 | Other | Moreno Valley · Riverside County | — | — |
| A S A P Plumbing Heating And Air Conditioning | Michael David Greany | — | (951) 545 2888 | HVAC | Corona · Riverside County | — | — |
| A S A P Pumping INC | Michael Shawn Hildebrand | — | (760) 365 4125 | Other | Cathedral City · Riverside County | — | — |
| A S Aznoff Electric | Aaron Scott Aznoff | — | (626) 672 8765 | Electricians | Riverside · Riverside County | — | — |
| A S General Construction | Andres Jr Saenz | abimaelsandoval1992@gmail.com | (760) 396 6263 | GC, remodel, ADU | Coachella · Riverside County | — | — |
| A S L Construction INC | Daniel Lawrence Potter | — | (951) 940 0123 | GC, remodel, ADU | Corona · Riverside County | — | — |
| A S Legacy Construction INC | Jose Abel Sepulveda Leon | — | (951) 823 3294 | GC, remodel, ADU | Perris · Riverside County | — | — |
| A S M Painting INC | Velazquez Emma | estimating@asmpainting.com | (760) 625 7168 | Windows, patio, painters | Indio · Riverside County | — | — |
| A S Plastering | A S Plastering | — | (951) 318 7796 | Other | Moreno Valley · Riverside County | — | — |
| A S T Electric | Ali Asghar Tourkaman | — | (760) 250 9755 | Electricians | Rancho Mirage · Riverside County | — | — |
| A S T Stone Corporation | Martin Moisi Daszkal | — | (760) 398 4300 | Other | Coachella · Riverside County | — | — |
| A Shade Above | A Shade Above | — | (951) 691 2018 | Windows, patio, painters | Temecula · Riverside County | — | — |
| A Soria Tile Company | Arturo Rangel Soria | — | (951) 283 1747 | Other | Riverside · Riverside County | — | — |
| A T Custom Tile And Stone | Alfred Gabriel Torres | — | (951) 375 0525 | Other | San Jacinto · Riverside County | — | — |
| A Team Garage Doors | Carlos Alfredo Godinez | — | (760) 554 5273 | Other | Cathedral City · Riverside County | — | — |
| A To Z Construction | Steven Edward Pruszynski | — | (909) 980 0909 | GC, remodel, ADU | Corona · Riverside County | — | — |