| Alonso Plumbing INC | Julio Francisco Alonso Bolanos | — | (760) 979 3592 | Other | Fallbrook · San Diego County | — | — |
| Alonzo's Tree Service INC | Ricardo Gaspar Gaspar Gaspar | — | (760) 216 9816 | Windows, patio, painters | Escondido · San Diego County | — | — |
| Alpha & Omega Construction | Kenneth Alan Johnson | interested@domainmarket.com | (951) 692 1649 | GC, remodel, ADU | Pala · San Diego County | — | — |
| Alpha & Omega Electric | Ferdinand Grimalde Soedharto | — | (619) 381 0388 | Electricians | La Mesa · San Diego County | — | — |
| Alpha - Genesis Construction Corp | Levi Odin Prest | — | (619) 315 8520 | Other | Ramona · San Diego County | — | — |
| Alpha Advantage Home Builders INC | Linjiong Wang | info@alphaadvantagehomebuilders.com | (619) 850 0898 | GC, remodel, ADU | Chula Vista · San Diego County | — | — |
| Alpha Cat Welding | Alpha Cat Welding | — | (760) 807 2150 | Other | Fallbrook · San Diego County | — | — |
| Alpha Construction & Engineering Co | Youngho John Lim | — | (714) 401 9789 | GC, remodel, ADU | Fallbrook · San Diego County | — | — |
| Alpha Constructors | Alpha Constructors | gus1944@aol.com | (858) 518 9035 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Alpha Demolition | Perez Alvarez Rodolfo | adavis@davisadams.com | (619) 777 3535 | Other roofers | Ramona · San Diego County | — | — |
| Alpha Fence Solutions INC | Yepiz Armando | — | (619) 454 5749 | Other | Spring Valley · San Diego County | — | — |
| Alpha Graphics 554 | Richard Laszlo Muhr | — | (760) 727 3800 | Other | San Marcos · San Diego County | — | — |
| Alpha Handyman Services | Pratt Frederick | — | (619) 781 0550 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Alpha Masonry | Juan Carlos Vazquez-Rendon | — | (619) 512 7173 | Other | National City · San Diego County | — | — |
| Alpha Mechanical INC | Boris Barshak | — | (858) 278 3500 | HVAC | El Cajon · San Diego County | — | — |
| Alpha Mechanical LLC | Mechanical Inc. Alpha | — | (858) 278 3500 | HVAC | El Cajon · San Diego County | — | — |
| Alpha Omega General Contractor | Alpha Omega General Contractor | — | (619) 787 2255 | GC, remodel, ADU | Ramona · San Diego County | — | — |
| Alpha Sd INC | Mengnan Zhou | sales@alphasd.com | (619) 918 8880 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Alpha Turf INC | Gutierrez Alexander | — | (619) 961 9215 | Other | Chula Vista · San Diego County | — | — |
| Alpha-pro Electric | John Lee Disano | — | (760) 840 9771 | Electricians | Encinitas · San Diego County | — | — |
| Alpine Builder | Alpine Builder | — | (619) 627 7501 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Alpine Construction Company | Kippy Allen Thomas | jcayala@traycons.com | (619) 884 9994 | HVAC | Alpine · San Diego County | — | — |
| Alpine Fence INC | William Anthony Lepetri | larsskolmar@att.net | (619) 659 9320 | Other | Alpine · San Diego County | — | — |
| Alpine Kitchen And Bath Remodeling INC | Samantha Marie Gonzalez | — | (619) 922 1835 | GC, remodel, ADU | El Cajon · San Diego County | — | — |
| Alpine Overhead Doors INC | Curtiss Jeffrey Habecker | — | (619) 722 1243 | Other | Alpine · San Diego County | — | — |
| Alpine Pressure | Alpine Pressure | aspenalpinepressure@gmail.com | (970) 274-9717 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Alpine Roof Co | Cisterna Cary | jenna@weathertightroofing.com | (562) 254 2317 | Other roofers | San Diego · San Diego County | — | — |
| Als Construction INC | Adolfo Lizarraras Santos | buildzoomsupport@blockrenovation.com | (619) 382 6041 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Als Custom Home Builder | Als Custom Home Builder | chantilly@cbrownassociates.org | (760) 855 9641 | GC, remodel, ADU | Escondido · San Diego County | — | — |
| Alshouse Painting | Alshouse Painting | — | (760) 484 3318 | Windows, patio, painters | Ramona · San Diego County | — | — |
| Alsobrook Construction Company INC | Kevin Lewis Alsobrook | guy@infinitydesignbuild.com | (858) 232 2436 | GC, remodel, ADU | San Diego · San Diego County | — | — |
| Alta Builders INC | David Hamilton Duncan | — | (619) 392 1202 | GC, remodel, ADU | Bonita · San Diego County | — | — |
| Alta Drywall | Jason Shane Bellamy | april@altadrywall.com | (760) 743 0331 | Other | Escondido · San Diego County | — | — |
| Alta Mirada Tree And Landcare INC | Mendoza Giovanni | — | (760) 613 8769 | Windows, patio, painters | Oceanside · San Diego County | — | — |
| Alta Roofing & Waterproofing INC | Vladislav Natanovich Gorshteyn | jamil@symonsfp.com | (858) 256 7663 | Other roofers | San Diego · San Diego County | — | — |
| Altamirano Plumbing And Drains INC | Kevin Sr Altamirano | — | (619) 867 5058 | Other | San Diego · San Diego County | — | — |
| Altech | Cabrera Juan | support@altech-usa.com | (619) 206 1681 | Electricians | Oceanside · San Diego County | — | — |
| Altek Roofing | Donald Edward Fallon | sales@altekroofing.com | (619) 871 3112 | Other roofers | Vista · San Diego County | — | — |
| Altered Air | Altered Air | — | (760) 594 1125 | HVAC | San Marcos · San Diego County | — | — |
| Alternative Disposal INC | James Clark Murphy | — | (760) 723 5871 | Other | Fallbrook · San Diego County | — | — |