| Aj Plumbing Corp | Alejandro Ortiz | — | (619) 318 4719 | Other | Chula Vista · San Diego County | — | — |
| Aj Rs Pool Service | Randy Earnest Serrano | — | (760) 294 1342 | Pool | Escondido · San Diego County | — | — |
| Aj Tile Installation | Aj Tile Installation | — | (760) 532 0819 | Other | Escondido · San Diego County | — | — |
| Aj West Coast Construction INC | Jorge Alberto Garcia Mendez | — | (619) 395 7801 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| Aja Construction INC | Anthony Joseph Astolfi | — | (619) 248 1951 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Ajam Construction | Barbara Annesser Murray | — | (858) 213 7566 | GC, remodel, ADU | Cardiff By The Sea · San Diego County | — | — |
| Ajc Construction Services INC | Adam James Curtin | — | (619) 634 8739 | GC, remodel, ADU | Poway · San Diego County | — | — |
| Ajc Drilling & Blasting Co | Anthony John Corirossi | — | (619) 873 6200 | Other | Alpine · San Diego County | — | — |
| Ajc Painting INC | Jimenez-castillo Andres | — | (619) 394 3504 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Ajd Construction And Farm Services | Dehbozorgi Salar | jcayala@traycons.com | (818) 519 3480 | GC, remodel, ADU | Rancho Santa Fe · San Diego County | — | — |
| Ajs3 Construction Co INC | Anthony Irvin Hughes | — | (619) 851 3231 | GC, remodel, ADU | Lemon Grove · San Diego County | — | — |
| Ajt Construction INC | Adrian Jay Tapia | guy@infinitydesignbuild.com | (619) 836 5145 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Ajz Construction | Arron Jesus Zepeda | — | (619) 551 4069 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Ak Construction | Abraam Riyad Khalil | guy@infinitydesignbuild.com | (858) 472 9561 | Electricians | San Diego · San Diego County | — | — |
| Ak Painting | Salvador Verastegui | — | (858) 472 8086 | Windows, patio, painters | Imperial Beach · San Diego County | — | — |
| Akae Builder | Phounsavath Akhaphone | %20akaebuilder@gmail.com | (619) 737 4747 | HVAC | San Diego · San Diego County | — | — |
| Akbarh Arreloa | Akbarh Arreloa | — | (619) 507 9081 | GC, remodel, ADU | Bonita · San Diego County | — | — |
| Akko Heating And Cooling | Farooq Akko | — | (619) 212 6847 | HVAC | El Cajon · San Diego County | — | — |
| Akovash Flooring INC | Alexander Both | — | (760) 815 2428 | Other | Solana Beach · San Diego County | — | — |
| Al - Tech Plumbing | Al - Tech Plumbing | — | (619) 267 7788 | Other | Chula Vista · San Diego County | — | — |
| Al Aboosi Air | Al Aboosi Air | steved@precision-ac.com | (619) 467 9988 | HVAC | El Cajon · San Diego County | — | — |
| Al Villa Construction | Alvarez Villa Alberto | — | (760) 715 4007 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Al's Electrical Services | Alfred Lionel Overley | — | (760) 445 5930 | Electricians | Escondido · San Diego County | — | — |
| Al's Pool Maint & Repair | Al's Pool Maint & Repair | — | (619) 465 1106 | Pool | San Diego · San Diego County | — | — |
| Al's Quality Painting INC | Miranda Alfredo | alsqualitypainting1@gmail.com | (760) 535 5697 | GC, remodel, ADU | Vista · San Diego County | — | — |
| Aladdan Construction Corporation | Douglas Duane Andresen | — | (951) 453 6141 | GC, remodel, ADU | Bonita · San Diego County | — | — |
| Alameda Custom Flooring | Alameda Custom Flooring | — | (858) 750 0505 | Other | Santee · San Diego County | — | — |
| Alamo Remodel Stucco INC | Alamo Gerardo Magallanes | — | (619) 434 6775 | Other | San Diego · San Diego County | — | — |
| Alan Ang | Alan Ang | — | (858) 571 1010 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Alan Cunniff Construction | Alan Andrew Cunniff | — | (619) 254 3330 | GC, remodel, ADU | Imperial Beach · San Diego County | — | — |
| Alan J Wallock Company | Alan Jay Wallock | — | (760) 944 9700 | GC, remodel, ADU | Cardiff · San Diego County | — | — |
| Alan's Asphalt Paving | Alan's Asphalt Paving | — | (760) 801 0456 | Other | Vista · San Diego County | — | — |
| Alanis Air Heating & Air | Stephen Christopher Alanis | mn@tritonair.net | (951) 377 6459 | HVAC | Valley Center · San Diego County | — | — |
| Alante Construction | Richard Marco Villalpando | aqremodeling2@gmail.com | (619) 589 7051 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Alarcon Steel Products INC | Emmanuel Omar Alarcon Torres | — | (619) 755 4030 | Other | San Diego · San Diego County | — | — |
| Alarms Unlimited Incorporated | Hal Lewis | — | (619) 297 4500 | Electricians | San Diego · San Diego County | — | — |
| Alba Construction | Michael Contreras Alba | buildzoomsupport@blockrenovation.com | (619) 864 9774 | GC, remodel, ADU | Imperial Beach · San Diego County | — | — |
| Alba's Remodeling | Arellano Francisco Alba | — | (619) 647 4551 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Albert Cruz Jr Concrete | Albert Cruz Jr Concrete | info@albertcruzjrconcrete.com | (760) 716 4142 | Other | San Marcos · San Diego County | — | — |
| Albert Tony Gutierrez | Albert Tony Gutierrez | — | (858) 735 7880 | GC, remodel, ADU | San Diego · San Diego County | — | — |