| Alexander Construction | Charles William Jr Alexander | charles@alexanderconstruction7.com | (760) 594 4048 | Electricians | Vista · San Diego County | — | — |
| Alexander Contracting | Graham Fenton Alexander | — | (760) 277 2785 | Other | Fallbrook · San Diego County | — | — |
| Alexander Custom Builds | Alexander Custom Builds | — | (619) 300 7894 | GC, remodel, ADU | Alpine · San Diego County | — | — |
| Alexander O Trepte | Alexander O Trepte | — | (858) 752 4107 | GC, remodel, ADU | La Jolla · San Diego County | — | — |
| Alexander Stevens Construction | Alexander Thomas Stevens | guy@infinitydesignbuild.com | (714) 253 4548 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| Alexis Painting | Alexis Painting | alexispainting1201@gmail.com | (760) 783 8512 | Windows, patio, painters | Vista · San Diego County | — | — |
| Alexis Roman | Alexis Roman | — | (619) 382 0314 | Other | San Diego · San Diego County | — | — |
| Alfa Construction | Vladimir Sr Dyomin | guy@infinitydesignbuild.com | (858) 344 9982 | GC, remodel, ADU | La Jolla · San Diego County | — | — |
| Alfa Experts Electrical Corporation | Jaberi Ayoub | alfaexpertselectrical@gmail.com | (760) 846 0477 | Electricians | Carlsbad · San Diego County | — | — |
| Alfaro Electrical Services | Mendez Angel Alfaro | contact@claycoelectric.org | (619) 273 1581 | Electricians | San Diego · San Diego County | — | — |
| Alfaros Remodeling Company LLC | Andrew Kwok Chow | — | (760) 208 3793 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Alfer Electric INC | Anthony Gene Jr Alfer | eddie.haro@electricare.com | (760) 518 0734 | Electricians | Escondido · San Diego County | — | — |
| Alfonso Escalante | Alfonso Escalante | — | (619) 322 8513 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Alfonso Perez | Alfonso Perez | — | (760) 644 7842 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Alfonzo's Tile & Drywall | Alfonzo's Tile & Drywall | — | (619) 218 1751 | Other | La Mesa · San Diego County | — | — |
| Alfred Belmonte Construction | Belmonte Alfred | — | (760) 432 0418 | GC, remodel, ADU | San Marcos · San Diego County | — | — |
| Alfred's J Painting Co | Juarez Maciel Alfredo | — | (619) 534 0270 | Windows, patio, painters | National City · San Diego County | — | — |
| Alfredo Ordonez Construction | Ordonez Alfredo | — | (760) 731 4918 | GC, remodel, ADU | Fallbrook · San Diego County | — | — |
| Algar General Contractors | Eliesa Feke Aliki | tangimana72@icloud.com | (818) 912-2388 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Algo Bien Remodeling And Construction | Tatum Jay | — | (323) 202 3164 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Ali Abdulhayoglu | Ali Abdulhayoglu | — | (858) 531 2312 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Alice's Painting Services | Gamez Rafael Maciel | — | (619) 748 6027 | Windows, patio, painters | Carlsbad · San Diego County | — | — |
| Align Builders INC | Steve Spencer Sherrer | info@alignbuilders.com | (858) 800 2531 | GC, remodel, ADU | Carlsbad · San Diego County | — | — |
| Alison Construction | Adam Joseph Alison | — | (619) 977 8543 | GC, remodel, ADU | Santee · San Diego County | — | — |
| Alive Industries INC | Adam Scott Hammill | buildzoomsupport@blockrenovation.com | (760) 892 5483 | Electricians | Escondido · San Diego County | — | — |
| Alix Nolin Construction INC | Alix Nelson| Nolin Norma Nolin | — | (619) 855 2863 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Aljen Plumbing Co | Alan Guinn Barnes | — | (760) 604 3010 | Other | Carlsbad · San Diego County | — | — |
| Alka Flooring | Alka Flooring | support@alkaflooring.com | (760) 216 9666 | Other | San Marcos · San Diego County | — | — |
| All - Crete Concrete INC | Charles Wallace Jr Teems | — | (619) 443 4193 | Other | El Cajon · San Diego County | — | — |
| All - Pipe Plumbing | All - Pipe Plumbing | — | (619) 277 7475 | Other | Lakeside · San Diego County | — | — |
| All - Pro Maintenance & Repair INC | Timothy Noll Pollard | — | (619) 370 9308 | GC, remodel, ADU | Bonita · San Diego County | — | — |
| All - Pro Painting | All - Pro Painting | — | (619) 808 8778 | Windows, patio, painters | San Diego · San Diego County | — | — |
| All - Star Electric | Robert John Bilakovics | — | (760) 480 4122 | Electricians | Escondido · San Diego County | — | — |
| All - State Protection Services | Manuel Abram Weahkee | — | (760) 908 6754 | Electricians | San Marcos · San Diego County | — | — |
| All - Terrain Fencing | All - Terrain Fencing | — | (760) 235 3020 | Other | Ramona · San Diego County | — | — |
| All 4 One Construction Corp | Abraham Velderrain | — | (619) 990 0049 | GC, remodel, ADU | National City · San Diego County | — | — |
| All About Drains & Plumbing | Felipe Valentin Perez-Moya | allaboutdrains01@gmail.com | (619) 674 7877 | Other | San Ysidro · San Diego County | — | — |
| All About Flooring | Hernandez Elias Velasquez | — | (619) 882 8832 | Other | San Diego · San Diego County | — | — |
| All About Plumbing | Vicky Lynn Skoverski | — | (760) 231 1333 | Other | Oceanside · San Diego County | — | — |
| All About Plumbing INC | Troy Ray Edmiston | — | (619) 400 7107 | Other | Spring Valley · San Diego County | — | — |