| A S A P Property Services | Cesar Gamaniel Gutierrez | — | (760) 975 3531 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| A San Diego Painting INC | Arriaga-lopez Heriberto | — | (619) 789 3301 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| A Sanshey Electric INC | Anthony David Sanshey | — | (760) 743 6273 | Electricians | Escondido · San Diego County | — | — |
| A Second Opinion Garage Door Repair | Thomas Laurence Hesse | — | (760) 855 4670 | Other | San Marcos · San Diego County | — | — |
| A Specialty Construction Services | Richard Franklin Currie | — | (619) 829 6356 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| A Step Above Painting Co | Gomez Jaime | — | (619) 463 9300 | Windows, patio, painters | Lemon Grove · San Diego County | — | — |
| A T A Fine Work Painting | Trejo Arteaga Armando | — | (760) 500 7062 | Windows, patio, painters | Vista · San Diego County | — | — |
| A T C Plumbing Source INC | Hector Cruz Gonzalez | — | (614) 988 0794 | Other | San Diego · San Diego County | — | — |
| A T Construction & Assoc | Scott Alan Brown | — | (858) 254 9484 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| A T D Garage Door | A T D Garage Door | danneely1958@gmail.com | (760) 591-9032 | Other | San Marcos · San Diego County | — | — |
| A T Electric | Anh D Tran | — | (619) 791 6173 | Electricians | San Diego · San Diego County | — | — |
| A T S Construction | Thomas Michael Eggert | — | (619) 439 2164 | GC, remodel, ADU | La Mesa · San Diego County | — | — |
| A Team Electrical | Gregory Jacques Madaoui | — | (760) 331 9769 | Electricians | Del Mar · San Diego County | — | — |
| A To Z Builders | A To Z Builders | — | (619) 454 7560 | GC, remodel, ADU | Valley Center · San Diego County | — | — |
| A To Z Concrete INC | Victor Manuel Jr Verdugo | — | (760) 708 6585 | Other | Poway · San Diego County | — | — |
| A To Z Cutting The Edge | Todd Christopher Turley | — | (760) 419 3676 | Other | Oceanside · San Diego County | — | — |
| A To Z Patio | A To Z Patio | info@atozpatio.com | (619) 743-6141 | GC, remodel, ADU | Santee · San Diego County | — | — |
| A To Z Plumbing INC | Charles Allen Martin | — | (619) 229 7789 | Other | San Diego · San Diego County | — | — |
| A To Z Roofing | A To Z Roofing | — | (619) 752-6454 | Other roofers | San Diego · San Diego County | — | — |
| A Touch Of Class Landscape | A Touch Of Class Landscape | — | (760) 443 1752 | Windows, patio, painters | Escondido · San Diego County | — | — |
| A U Electric Company | Augstin Lopez Ubongen | pureelectriccompany@gmail.com | (818) 618 8515 | Electricians | San Diego · San Diego County | — | — |
| A V Z Construction | Alejandro Vargas | — | (619) 789 7572 | GC, remodel, ADU | Ramona · San Diego County | — | — |
| A Vidovich Construction INC | August Louis| Vidovich Auggie Vidovich | stefanie@avidovichconstruction.com | (619) 390 1365 | GC, remodel, ADU | Lakeside · San Diego County | — | — |
| A W O Construction | Aaron Wayne Ottinger | — | (858) 333 1169 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| A W S Technologies INC | Michael Thomas Clancy | — | (760) 814 0679 | Electricians | Carlsbad · San Diego County | — | — |
| A White Construction INC DBA West Coast Roofing & Construction | Alexzander Ray White | — | (858) 487 4300 | Other roofers | Poway · San Diego County | — | — |
| A X Plumbing | A X Plumbing | axplumbingsd@gmail.com | (619) 578 8920 | Other | San Diego · San Diego County | — | — |
| A&a Fine Finish Painting INC | Andrew Anthony Garcia | — | (760) 705 7527 | Windows, patio, painters | Oceanside · San Diego County | — | — |
| A&a Proline Appliance Installs | Jorge Ali Camarillo | — | (619) 504 8442 | Other | San Diego · San Diego County | — | — |
| A&b General Contracting INC | Garcia Abraham Espinoza | — | (760) 532 6769 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| A&c Construction Managment | Juan Arturo Cesena | — | (619) 850 7714 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| A&f Home Remodeling INC | Francisco J Esquivel Figueroa | — | (619) 791 0312 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| A&h Finest Custom Flooring | Alonso Oscar Hernandez Diaz | sales@ahfinestcustomflooring.com | (760) 260-9773 | Other | San Marcos · San Diego County | — | — |
| A&j's Professional Roofing | Jaime Lucio Jr Moreno | info@christianroofing.com | (619) 274 6130 | Other roofers | San Diego · San Diego County | — | — |
| A&m Concrete | Antonio Torres-Silva | — | (760) 522 7723 | Other | Escondido · San Diego County | — | — |
| A&m Custom Windows | Alejandro Martinez | — | (619) 781 5224 | Windows, patio, painters | San Diego · San Diego County | — | — |
| A&m Rehab Construction INC | Macias Alberto | — | (619) 805 6027 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| A&m Specialized Coatings INC | Isidro Angulo-Vidana | — | (866) 858 4963 | Windows, patio, painters | Spring Valley · San Diego County | — | — |
| A&n Coastal Hauling | Fernando Joey Pasqual | — | (619) 647 8145 | Other | Vista · San Diego County | — | — |
| A&r Mechanical INC DBA A&r Building Solutions | Alberto Arturo Nunez | — | (619) 302 5959 | HVAC | Escondido · San Diego County | — | — |