| Arturo Hector Delgado Ruiz | Arturo Hector Delgado Ruiz | — | (619) 587 9383 | Other | Chula Vista · San Diego County | — | — |
| Arturo Hernandez Navarro | Arturo Hernandez Navarro | — | (619) 273 2113 | Other | Chula Vista · San Diego County | — | — |
| Arturo Jaime | Arturo Jaime | — | (760) 595 0104 | Windows, patio, painters | Oceanside · San Diego County | — | — |
| Arturo Ruben Ferratt | Arturo Ruben Ferratt | — | (619) 395 1004 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Arturo Sanchez | Arturo Sanchez | info@arturosanchez.com | (858) 539 6886 | GC, remodel, ADU | Encinitas · San Diego County | — | — |
| Arturo Venegas Montiel | Arturo Venegas Montiel | info@christianroofing.com | (760) 300 9453 | Other roofers | Escondido · San Diego County | — | — |
| Artwell Construction LLC | Eric Alan Reedy | ericreedy@gmail.com | (619) 630 0638 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Arw Construction | Adam Robert Wotursky | — | (619) 994 7304 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Arz Glass INC | Raul Macias Zuniga | — | (619) 654 2327 | Windows, patio, painters | San Ysidro · San Diego County | — | — |
| As Builders INC | Andres Octavio Silva Robles | — | (619) 724 3413 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| As Built Construction | James Alan Scheel | — | (619) 729 0663 | GC, remodel, ADU | Lakeside · San Diego County | — | — |
| Asap Bathtub Refinishing S D | Perez Israel Cervantez | — | (619) 653 6582 | Other | Chula Vista · San Diego County | — | — |
| Asap Electric Services INC | Jesus Arcadio Avina | — | (760) 535 1397 | Electricians | Oceanside · San Diego County | — | — |
| Asap Garage Door And Security Services LLC | Asaf Ofir | — | (760) 672 8509 | Alarm and generators | Oceanside · San Diego County | — | — |
| Asap Quality Builders INC | Ramos Noe Carachure | — | (619) 520 2523 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Asap Refrigeration | Asap Refrigeration | asaprefrigeration@hotmail.com | (619) 212 6277 | HVAC | Lakeside · San Diego County | — | — |
| Asap Security Guards | Asap Security Guards | info@asapsecurity.org | (833) 272-7247 | Alarm and generators | San Diego · San Diego County | — | — |
| Asbury Steel INC | Jeffrey Shannon Clinkscales | micah@micahrich.com | (619) 465 2311 | Other | Spring Valley · San Diego County | — | — |
| Ascencion Villa Stone & Tile Incorporated | Villa Ascencion | — | (760) 994 6152 | Other | Oceanside · San Diego County | — | — |
| Ascend Custom Tile Installations | Cendan Arael | — | (619) 889 3484 | Other | San Diego · San Diego County | — | — |
| Ascend Plumbing INC | Randy James Borman | jlvplumbing82@yahoo.com | (858) 800 1141 | HVAC | San Diego · San Diego County | — | — |
| Ascent Roofing | Carlos Alfredo Alfaro | khim_jeffery@hotmail.com | (619) 386 5574 | Other roofers | National City · San Diego County | — | — |
| Ascent Roofing San Diego | Ascent Roofing San Diego | office@ascentroofingsd.com | (858) 462-7753 | Other roofers | National City · San Diego County | — | — |
| Ascentt Corporation | Eiling Lorena Ferdaws | contact@ascentt.com | (949) 742 9767 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Aschinger Construction INC | Thomas Arno Aschinger | — | (619) 972 6558 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Ase Contracting INC | Robert Daniel Contreras | — | (619) 258 7290 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Aserrin Flooring | Aserrin Flooring | — | (619) 957 8053 | Other | Spring Valley · San Diego County | — | — |
| Asgard Energy | Kevin Douglas Prill | info@asgardenergy.com | (855) 760 3637 | Electricians | Oceanside · San Diego County | — | — |
| Ashley Pools & Spa Service | Mario Roberto Portillo | — | (858) 829 3825 | Pool | San Diego · San Diego County | — | — |
| Ashton Backflow Service | Patrick Thomas Ashton | — | (619) 339 7631 | Other | National City · San Diego County | — | — |
| Asi Commercial Construction | Jordan Phillip Shapiro | — | (858) 609 9093 | Electricians | El Cajon · San Diego County | — | — |
| Asi Fire Protection | Richard Silvester Rincon Martinez | — | (760) 208 4888 | Other | Escondido · San Diego County | — | — |
| Asi The White Glove Guys | Asi The White Glove Guys | — | (619) 350-3205 | HVAC | San Diego · San Diego County | — | — |
| Asikka INC | David N Shamula | hello@asikka.com | (732) 757 6519 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Asmann Construction And Development | Thomas Edward Asmann | — | (760) 634 7979 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Aspect Flooring Corp | Claude Albert Hutchins | — | (619) 210 4443 | Other | San Diego · San Diego County | — | — |
| Aspen Builders | Aspen Builders | guy@infinitydesignbuild.com | (858) 480 1248 | GC, remodel, ADU | Bonita · San Diego County | — | — |
| Aspen Color & Paint Works | Aspen Color & Paint Works | — | (619) 540 2412 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Aspen Custom Cabinets And Design INC | Michael Allen Mullet | — | (619) 303 0911 | Other | Spring Valley · San Diego County | — | — |
| Aspen Interior Design | David Carlton Espy | — | (760) 749 2495 | Other | Valley Center · San Diego County | — | — |