| Active Endeavor INC | Dirk Alexander Cahaan | guy@infinitydesignbuild.com | (619) 913 4852 | GC, remodel, ADU | Spring Valley · San Diego County | — | — |
| Active Framing INC | Marquez Javier | activeframing@gmail.com | (760) 213 8112 | Other | Escondido · San Diego County | — | — |
| Active Sign Company | James Scott Chakos | — | (619) 962 8615 | Other | Coronado · San Diego County | — | — |
| Acts Tile INC | Alonso Ortiz | — | (619) 246 2713 | Other | Chula Vista · San Diego County | — | — |
| Acuna's Framing INC | Acuna Salgado Efrain | — | (858) 663 4733 | Other | Santee · San Diego County | — | — |
| Acuna's Polar Aire | Acuna's Polar Aire | — | (858) 486 2590 | HVAC | San Marcos · San Diego County | — | — |
| Acustik LLC | Isaac Valenzuela | — | (619) 480 8677 | Other | San Ysidro · San Diego County | — | — |
| Acuterra INC | Russell Law Pogue | info@acuterra.com | (858) 509 1500 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Acv Arc Builders LLC | Jorge Alberto Acevedo | — | (619) 882 8295 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| Acw General Engineering | Alexis Nicole Belio | — | (619) 312 1070 | Other | El Cajon · San Diego County | — | — |
| Ad Magellan | Paul Lavan Reyes | info@admagellan.com | (760) 442 5574 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Ada Electric INC | Alejandro Jose De Anda | — | (760) 994 7073 | Electricians | Carlsbad · San Diego County | — | — |
| Adail Bastos INC DBA Adail Bastos Roofing | Adail Amaral Bastos | adail@bastosroofing.com | (619) 534 9663 | Other roofers | San Diego · San Diego County | — | — |
| Adair Striping INC | Donald Craig Riddle | — | (760) 597 0977 | Other | Vista · San Diego County | — | — |
| Adalian Electric | Garry Donald Adalian | — | (760) 893 0693 | Electricians | Carlsbad · San Diego County | — | — |
| Adaly Electrical & Energy Solutions INC | Rodolfo Tapia | info@adalyeesolutions.com | (619) 805 6706 | Electricians | San Diego · San Diego County | — | — |
| Adam Devita | Adam Devita | — | (760) 420 6210 | GC, remodel, ADU | San Marcos · San Diego County | — | — |
| Adam Gardner Plumbing INC | Adam Gardner | — | (619) 449 0554 | Other | Santee · San Diego County | — | — |
| Adam King Realtor | Adam King Realtor | — | (619) 568-2649 | Property managers | San Diego · San Diego County | — | — |
| Adam Walker Electric | Adam Jacob Walker | — | (760) 479 1426 | Electricians | Solana Beach · San Diego County | — | — |
| Adam's Quality Home Services | Adam Nicolas Giglio | — | (760) 855 0838 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Adam's Tree Care | Adam's Tree Care | — | (619) 731 1085 | Tree | Chula Vista · San Diego County | — | — |
| Adama Builders | Mizrachi Roei | info@adamabuilders.com | (619) 535 8580 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Adams & Asaro Development INC | Ritchie Bernard Adams | — | (858) 405 3788 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Adams Electrical Contractors | Michael David Jensen | — | (619) 258 9846 | Electricians | Santee · San Diego County | — | — |
| Adams Engineering INC | Bjorn Warren Adams | — | (858) 756 4568 | HVAC | Rancho Santa Fe · San Diego County | — | — |
| Adams Plumbing & Drain | Adams Plumbing & Drain | — | (619) 606 1952 | Other | San Diego · San Diego County | — | — |
| Adan Cruz Roofing Company | Adan Valle Cruz | info@christianroofing.com | (760) 598 7545 | Other roofers | Oceanside · San Diego County | — | — |
| Adan's Tree Service Corporation | Josephine Carmina Rodriguez | — | (760) 822 5178 | Tree | Fallbrook · San Diego County | — | — |
| Adar Electric Corporation | Daryoush Ostad Asadollahi | — | (619) 846 0085 | Electricians | San Diego · San Diego County | — | — |
| Adcom Electrical | Pedro Antonio Martinez | — | (619) 386 5132 | Electricians | Chula Vista · San Diego County | — | — |
| Addamo Development | Addamo Development | — | (760) 579 8654 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Addax Electric INC | Gary Colby Gandy | — | (619) 749 8360 | Electricians | El Cajon · San Diego County | — | — |
| Addison Construction | Zachary Quiroz Addison | — | (619) 992 0019 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Addison Sheet Metal INC | Sean Adam Kirkwood | info@addisonsheetmetal.com | (760) 438 1755 | Other | Carlsbad · San Diego County | — | — |
| Adelie Construction | Frank Armando Ree De La Cuba | agustin@adelieconstruction.com | (760) 705 0418 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Adelsman Custom Cabinetry INC | Bradley Thomas Adelsman | — | (858) 260 1942 | Other | Vista · San Diego County | — | — |
| Adept Builders | Adept Builders | sales@adept-builders.com | (619) 507 9583 | GC, remodel, ADU | Bonita · San Diego County | — | — |
| Adept Construction | Calvin Michael Johnson | — | (619) 972 3378 | GC, remodel, ADU | Lemon Grove · San Diego County | — | — |
| Adhesion Painting | Adhesion Painting | — | (760) 271 8516 | Windows, patio, painters | Oceanside · San Diego County | — | — |