| Alternative Energy Applications INC | Craig Anthony Smith | info@altenergyapplications.com | (619) 269 6767 | Other | San Diego · San Diego County | — | — |
| Alterra Landscape Systems INC | Mark Alan Radeke | — | (760) 644 8036 | Windows, patio, painters | Ramona · San Diego County | — | — |
| Alterra Outdoor Living | Alterra Outdoor Living | info@ndiscovered.com | (760) 845 4834 | Windows, patio, painters | Escondido · San Diego County | — | — |
| Altitude Drywall | Altitude Drywall | — | (858) 291 9398 | Other | Chula Vista · San Diego County | — | — |
| Altitude INC | Brian Scott Wilson | amiller@atmholdings.com | (858) 692 4279 | Electricians | Carlsbad · San Diego County | — | — |
| Altitude Roofing INC | Claudio Javier Dominguez Lopez | office@altituderoofinginc.com | (760) 216 2707 | Other roofers | San Marcos · San Diego County | — | — |
| Alton Theodore Pfeifle | Alton Theodore Pfeifle | mn@tritonair.net | (760) 723 8961 | HVAC | Fallbrook · San Diego County | — | — |
| Altura Construction And Renovation | Alejandro Franco | info@alturagc.com | (619) 786 0030 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| Alturdyne International | Frank Girard Jr Verbeke | — | (619) 593 0757 | Electricians | El Cajon · San Diego County | — | — |
| Aluminum And Vinyl Fence Co LLC | Gary Karapet Karamanoukian | — | (818) 314 7543 | Other | San Marcos · San Diego County | — | — |
| Alva Roofing | Luis Roberto Alva Rodriguez | mcgrawr04@gmail.com | (619) 549 2760 | Other roofers | San Diego · San Diego County | — | — |
| Alvand Construction INC | Parvin Ashtari | — | (858) 668 2830 | GC, remodel, ADU | Poway · San Diego County | — | — |
| Alvarado Construction | Alvarado Fernando | — | (760) 497 7478 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Alvarado Electric | David Antonio Alvarado | contact@claycoelectric.org | (619) 708 0390 | Electricians | San Diego · San Diego County | — | — |
| Alvarez And Shaw Incorporated | Chase Easton Alvarez | info@alvarezandshaw.com | (619) 383 4102 | Other | Alpine · San Diego County | — | — |
| Alvarez Av Solutions | Alvarez Av Solutions | — | (619) 250 0394 | Other | Chula Vista · San Diego County | — | — |
| Alvarez Custom Builders | Alvarez Custom Builders | — | (619) 268 1044 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| Alvarez Electric | Paul Joseph Alvarez | contact@claycoelectric.org | (619) 251 6088 | Electricians | Lemon Grove · San Diego County | — | — |
| Alvarez Roofing INC | Francisco Sr Alvarez-Rico | buildzoomsupport@blockrenovation.com | (760) 443 6829 | Other roofers | Escondido · San Diego County | — | — |
| Alvarez Voltage | Alvarez Voltage | — | (858) 308 2950 | Electricians | San Diego · San Diego County | — | — |
| Alve Mechanical | Alve Mechanical | buildzoomsupport@blockrenovation.com | (619) 200 8802 | HVAC | San Marcos · San Diego County | — | — |
| Alvelais Construction | Samuel Ivan Alvelais Rodriguez | — | (619) 419 3919 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Alvizia Corporation | James Christopher Mcnees | — | (619) 591 9162 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Alvord Enterprises INC DBA Next Generation.construction | Mike Castro-Montoya | — | (619) 518 3749 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Always Electrical & Maintenance | Kurt James Sailler | shawn@hcmsandiego.com | (619) 415 5514 | Electricians | San Diego · San Diego County | — | — |
| Always On Electric INC | Alexander Joseph Guerra | interested@domainmarket.com | (858) 215 4949 | Electricians | San Diego · San Diego County | — | — |
| Always Open Garage Door INC | Eduardo Rafael Langarica | — | (619) 955 3973 | Other | Chula Vista · San Diego County | — | — |
| Always Quality Electrical INC | Christine Michelle Hartinger | — | (858) 269 5048 | Electricians | San Diego · San Diego County | — | — |
| Always Roofing INC | Glen Lamone Hopson | info@christianroofing.com | (619) 277 7729 | Other roofers | El Cajon · San Diego County | — | — |
| Always True Plumbing | Always True Plumbing | — | (714) 715 3731 | Other | Carlsbad · San Diego County | — | — |
| Am Demolition Services | Mendiola Resendiz Artemio | — | (760) 884 6203 | Other | Escondido · San Diego County | — | — |
| Am Electric Services INC | Alejandro Mercado | — | (619) 438 1370 | Electricians | San Diego · San Diego County | — | — |
| Am Enterprise Construction And Remodeling | Messier Alexander | — | (858) 269 9123 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Am Fences | Am Fences | — | (760) 717 3971 | Other | Vista · San Diego County | — | — |
| Am Heating & Air INC | Jonathan Paul Anderson | info@amhvacinc.com | (760) 500 6951 | HVAC | Carlsbad · San Diego County | — | — |
| Am Landscape Construction INC | Mozaffarian Aria | — | (858) 444 6964 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Am Quality Painting | Am Quality Painting | — | (619) 675 4510 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Am Remodeling Services LLC | Martinez Anselmo | aqremodeling2@gmail.com | (619) 942 0539 | GC, remodel, ADU | Lemon Grove · San Diego County | — | — |
| Ama Drywall | Ama Drywall | — | (619) 726 3105 | Other | San Diego · San Diego County | — | — |
| Amador's Painting | Amador's Painting | — | (619) 864 3221 | Windows, patio, painters | San Diego · San Diego County | — | — |