| Aman General Contracting | Christopher Dean Garcia | — | (760) 855 1192 | Other | Valley Center · San Diego County | — | — |
| Amaya Builder | Amaya Builder | info@amayabuilder.com | (858) 284 6054 | GC, remodel, ADU | Oceanside · San Diego County | — | — |
| Amazing Custom Construction INC | Omar Pina | — | (773) 403 2796 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Amazing Glazing | Joseph Charles Schultz | — | (760) 512 3667 | Windows, patio, painters | Oceanside · San Diego County | — | — |
| Amazing Pools And Remodeling INC | Paul Joseph Cunningham | amazingpjc@gmail.com | (760) 877 0557 | GC, remodel, ADU | San Marcos · San Diego County | — | — |
| Amazing Synthetic Greens INC | Gustavo Pecheco Garcia | — | (619) 895 2491 | Windows, patio, painters | Oceanside · San Diego County | — | — |
| Amazon Landscape & Maintenance INC | Curiel Rodrigo | — | (760) 535 0909 | Windows, patio, painters | Escondido · San Diego County | — | — |
| Amazonia INC | Roberta Jacobs | info@amazonia.com.au | (760) 533 6656 | Other | Solana Beach · San Diego County | — | — |
| Amber M Fox | Amber M Fox | — | (853) 569 3816 | Other | San Diego · San Diego County | — | — |
| Amber Sunset Pool Service & Repair | Michael Joseph Ortega | — | (760) 908 9819 | Pool | Oceanside · San Diego County | — | — |
| Ambiance - Glass And Shower Design | David John Kugler | — | (760) 471 6397 | Windows, patio, painters | San Marcos · San Diego County | — | — |
| Ambient Air Control Systems | William Michael Armock | steved@precision-ac.com | (619) 448 4405 | HVAC | Alpine · San Diego County | — | — |
| Ambient Heating & Air Conditioning | Ambient Heating & Air Conditioning | rbustani75@yahoo.com | (619) 454 4975 | HVAC | San Diego · San Diego County | — | — |
| Ambient Heating And Air Conditioning | Ambient Heating And Air Conditioning | rbustani75@yahoo.com | (619) 454-4975 | HVAC | Oceanside · San Diego County | — | — |
| Ambient Management Services LP | Kenneth Jean Screeton | jcayala@traycons.com | (760) 230 1000 | GC, remodel, ADU | Encinitas · San Diego County | — | — |
| Ambrit Services INC | Christopher Alfred James Hyams | — | (619) 647 4200 | Other | Santee · San Diego County | — | — |
| Ambrosini Build | Kyle James Ambrosini | guy@infinitydesignbuild.com | (858) 999 5102 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Ambrosini Long Development | Jeffrey Robert Long | ambrosinilong@gmail.com | (858) 899 3331 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Amc General Engineering INC | Andre Martinez | — | (619) 734 4862 | Other | Chula Vista · San Diego County | — | — |
| Amc Landscape Systems INC | Alberto Julian Canedo | — | (760) 746 4737 | Windows, patio, painters | Escondido · San Diego County | — | — |
| Amco Concrete | Amco Concrete | — | (760) 522 0134 | Other | Bonsall · San Diego County | — | — |
| Amden Homes INC | Humberto Daniel De La Torre | info@amdenhomes.com | (619) 608 9089 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Amec Innovations INC | Allen Jibrael Raees | — | (866) 960 0046 | Other | San Diego · San Diego County | — | — |
| Ameca Windows & Screens Maintenance/replacement | Ameca Windows & Screens Maintenance/replacement | — | (619) 239 4533 | Windows, patio, painters | San Diego · San Diego County | — | — |
| Ameizcapes INC | Marco Antonio Huizar Ruiz | info@ameizcapes.com | (619) 560 2754 | Windows, patio, painters | Bonita · San Diego County | — | — |
| Ameri - Mex Plumbing INC | Javier Arthur Morales | amerimexpl@aol.com | (619) 422 8996 | HVAC | Chula Vista · San Diego County | — | — |
| Ameri-conditioning Mechanical Systems | Ameri-conditioning Mechanical Systems | info@ndiscovered.com | (691) 643 1175 | HVAC | Boulevard · San Diego County | — | — |
| America Granite Marble And Tile | America Granite Marble And Tile | — | (760) 535 9121 | Other | Escondido · San Diego County | — | — |
| America Group Roofing LLC | Pinedo Isaac Villarreal | contact@americagrouproofing.com | (619) 632 8320 | Other roofers | Ramona · San Diego County | — | — |
| America Heating And Air Conditioning | America Heating And Air Conditioning | steved@precision-ac.com | (619) 709 3737 | HVAC | San Diego · San Diego County | — | — |
| America King Of Flooring | America King Of Flooring | — | (760) 492 0760 | Other | Escondido · San Diego County | — | — |
| America's Finest Carpet Company | Carlos Gabriel Ledesma | — | (760) 436-5552 | Other | Chula Vista · San Diego County | — | — |
| America's Finest Plastering Company | Miguel Angel Ii Valenzuela | — | (619) 252 4204 | Other | San Diego · San Diego County | — | — |
| America's Finest Sound | America's Finest Sound | — | (619) 654 3116 | Other | San Diego · San Diego County | — | — |
| America's Restoration & Construction | Freddy Frank La Carra | arc.admin.sd@gmail.com | (619) 862 5303 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| American A V | American A V | — | (619) 933 6694 | Electricians | San Diego · San Diego County | — | — |
| American Ace Plumbing And Drain | American Ace Plumbing And Drain | — | (858) 733 1271 | HVAC | San Diego · San Diego County | — | — |
| American Acoustics | American Acoustics | americanacoustics@gmail.com | (858) 246 6221 | Other | San Diego · San Diego County | — | — |
| American Ally Drains & Plumbing LLC | Anthony Michael Hernandez | — | (619) 777 9055 | Other | Ramona · San Diego County | — | — |
| American Assets Trust INC | Jerry Gammieri | info@americanassets.com | (858) 350 2600 | GC, remodel, ADU | San Diego · San Diego County | — | — |