| Austin Doors | Keith Stanley Rosenberger | — | (760) 599 2611 | Other | Vista · San Diego County | — | — |
| Austin Gearing | Austin Gearing | — | (707) 694 1224 | Electricians | Oceanside · San Diego County | — | — |
| Austin Mcadams Design & Fabrication DBA Mcadams Woodworks | Matthew Austin Mcadams | — | (804) 502 2857 | Other | San Diego · San Diego County | — | — |
| Austin T Mcdonald | Austin T Mcdonald | — | (619) 321 8222 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Austin Wermers | Austin Wermers | — | (858) 922 0443 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Austin Whisenant | Austin Whisenant | — | (619) 708 9260 | GC, remodel, ADU | Jacumba · San Diego County | — | — |
| Austin's Power Plumbing | Austin's Power Plumbing | — | (760) 716 0255 | Other | Vista · San Diego County | — | — |
| Authentic 16 Sealants | Henry Roman Estrada | — | (619) 638 5324 | Other | Chula Vista · San Diego County | — | — |
| Authentic Painting | Authentic Painting | — | (619) 946 9174 | Windows, patio, painters | Chula Vista · San Diego County | — | — |
| Authentic Plumbing | Authentic Plumbing | — | (760) 877 1170 | Other | Oceanside · San Diego County | — | — |
| Authorized Refrigeration | Authorized Refrigeration | guy@infinitydesignbuild.com | (323) 642 4591 | HVAC | National City · San Diego County | — | — |
| Automated Controls Services INC | Thomas Jay La Flam | — | (619) 669 0500 | Other | Jamul · San Diego County | — | — |
| Automated Entry Systems INC | Wilson Marcelo Naranjo | — | (760) 741 8332 | Other | Escondido · San Diego County | — | — |
| Automated Interiors | David Alan Bezio | contact@claycoelectric.org | (619) 438 0804 | Electricians | El Cajon · San Diego County | — | — |
| Automatic Door Specialists | Richard James Eucker | — | (858) 450 0389 | Other | San Diego · San Diego County | — | — |
| Automatic Entry Solutions INC | Jose Ricardo Ramirez | — | (619) 414 6811 | Other | Lemon Grove · San Diego County | — | — |
| Automatic Ice Makers | Sonia Elia Ashida | — | (619) 282 3832 | HVAC | San Diego · San Diego County | — | — |
| Av Associates Incdba Ava Design & Build | David Alonso-Heredia | guy@infinitydesignbuild.com | (619) 318 3738 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| Av Builder Corp | Antonio Vieira Madureira | — | (858) 622 9200 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Av Concrete Pumping LLC | Angelo Anthony Vozza | avozza@avconcretepumping.com | (760) 994 5391 | Other | Carlsbad · San Diego County | — | — |
| Av Construction | Avalos Valencia Octavio | — | (760) 622 8819 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Av Craftsman | Av Craftsman | — | (760) 703 7618 | Other | Vista · San Diego County | — | — |
| Av Prodigy Builders | Angel Adalberto Valdivia | — | (619) 213 9579 | Other | Chula Vista · San Diego County | — | — |
| Av Roofing | Velazquez Dominguez Arturo | info@christianroofing.com | (760) 535 3055 | Other roofers | San Marcos · San Diego County | — | — |
| Av-ators INC | Jared Lee Magoon | — | (760) 214 4412 | Electricians | Escondido · San Diego County | — | — |
| Ava Electric | Hector Daniel Avalos | hctr_avalos@yahoo.com | (760) 755 0318 | Electricians | Escondido · San Diego County | — | — |
| Ava's Plumbing | Rene Gonzalez Lopez | info@avasplumbing.com | (619) 578 2753 | Other | San Diego · San Diego County | — | — |
| Avalon Stones | Avalon Stones | avalonstones@outlook.com | (619) 419 6116 | Other | San Diego · San Diego County | — | — |
| Avalon Tile And Stone | Avalon Tile And Stone | — | (619) 980 4191 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Avant Property Solutions INC | Enrique Rebollar | — | (619) 987 3850 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Avante Construction INC | Yoko Watanabe Larkin | guy@infinitydesignbuild.com | (858) 432 4026 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Avanti Window Tint - Window Tinting Services | Avanti Window Tint - Window Tinting Services | gustavomancini09@gmail.com | (669) 200-1970 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Avc Integration | Brent James Christiaens | info@avcintegration.com | (619) 733 3353 | Other | Lakeside · San Diego County | — | — |
| Averett Custom Carpentry | Averett Custom Carpentry | — | (858) 205 9072 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Avezta Foundation | Diego Fernando Bastidas | info@avezta.org | (619) 630 8049 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Avgl Plumbing INC | Juan Andres Guzman Espinoza | — | (619) 638 6488 | Other | Santee · San Diego County | — | — |
| Aviara Interlocking Paver Systems | Jason Michael Farr | — | (858) 299 0500 | Other | Escondido · San Diego County | — | — |
| Avid Design & Build | Saar Zaken | — | (858) 692 4486 | GC, remodel, ADU | Poway · San Diego County | — | — |
| Avila Painting | Kevin Edgardo Avila-Solis | — | (619) 453 7832 | Windows, patio, painters | La Mesa · San Diego County | — | — |
| Avis Builders INC | Daniel Roger Avis | — | (858) 395 4602 | GC, remodel, ADU | Cardiff · San Diego County | — | — |