| A To Z Contractors INC | Kausil Deo Singh | — | (707) 688 5699 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| A Torres Construction | Abel Vital Torres | — | (707) 720 8138 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| A V F Systems INC | William Arlen Jr Young | — | (833) 428 3797 | Electricians | Vacaville · Solano County | — | — |
| A Z Builders Group INC | Louis William Jr Wright | — | (510) 393 1474 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| A&f Landscaping INC | Duran Fernando Duran | — | (707) 207 1062 | Windows, patio, painters | Fairfield · Solano County | — | — |
| A-1 Comfort Heating & Air | A-1 Comfort Heating & Air | — | (707) 301 0717 | HVAC | Fairfield · Solano County | — | — |
| A-1 Guaranteed Heating & Air Conditioning INC | Richard William Hiteshew | — | (707) 645 0734 | HVAC | Vallejo · Solano County | — | — |
| A-team Construction | Guillermo Louis Delgado | — | (707) 580 4584 | Electricians | Dixon · Solano County | — | — |
| A1 Maintenance LLC | Luis Roberto Zarate | enquiries@a1maintenance.com | (707) 563 7066 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| A100 Percent Guarantee Heating And A/c | Evan Tyler Thompson | — | (707) 689 5128 | HVAC | Vacaville · Solano County | — | — |
| A2z Landscaping INC | Zachariah Kenneth Wilkerson | — | (707) 425 2500 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Aaa Construction | Alvarado Arzate Alejandro | yuriy@aaaconstruction.com | (707) 580 7795 | Other | Suisun City · Solano County | — | — |
| Aaa Earthwork Ag & Habitat | Austin Clark Jr Wedemeyer | — | (707) 246 7796 | Other | Fairfield · Solano County | — | — |
| Aamp Electric | David Michael Schmidt | — | (707) 580 0586 | Electricians | Fairfield · Solano County | — | — |
| Aaron Lambert Construction And Remodel | Aaron Thomas Lambert | — | (707) 290 0938 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Aaron's Hardscape | Aaron's Hardscape | contact@aaronshardscape.com | (707) 720 5276 | Windows, patio, painters | Suisun City · Solano County | — | — |
| Ab Garage Doors INC | Manpreet Singh Bhangu | — | (510) 640 6090 | Other | Dixon · Solano County | — | — |
| Ab Plumbing | Aaron Bryce Blair | — | (916) 410 9109 | Other | Fairfield · Solano County | — | — |
| Abbott Concrete LLC | Jason David Abbott | — | (707) 758 6141 | Other | Benicia · Solano County | — | — |
| Abc Painting INC | Gina Marie Jeffress | — | (707) 562 1900 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Abc Renovations INC | Steven Alvarado | interested@domainmarket.com | (707) 419 2426 | GC, remodel, ADU | Suisun City · Solano County | — | — |
| Abel To Do It Construction | Chavez-tovar Abel | — | (707) 470 9821 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Abercrombie Enterprises | Jackie Ray Abercrombie | — | (707) 290 5024 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Abl Electric | Jose Antonio Lopez Garcia | — | (707) 631 9955 | Electricians | Vacaville · Solano County | — | — |
| Able Asphalt | Able Asphalt | — | (707) 340 6065 | Other | Vacaville · Solano County | — | — |
| Above All Roofing | Above All Roofing | — | (951) 574-3723 | Other roofers | Wildomar · Solano County | — | — |
| Above All Roofing & Seamless Gutters INC | Joann Marie Barnard | — | (707) 446 8819 | Other roofers | Vacaville · Solano County | — | — |
| Above And Beyond Plumbing Services | James Bernard Brandon | — | (707) 363 5013 | Other | Fairfield · Solano County | — | — |
| Above Board Windows | Above Board Windows | — | (707) 249 1090 | GC, remodel, ADU | Fairfield · Solano County | — | — |
| Above Standard Construction | Espinoza Gerardo | — | (510) 544 9459 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Abraham Electric | Licea Abraham | — | (415) 786 2181 | Electricians | Vallejo · Solano County | — | — |
| Absolute Finishing | Absolute Finishing | — | (707) 207 5602 | GC, remodel, ADU | Benicia · Solano County | — | — |
| Absolute Remodel & Construction | Joel Sr Garza | — | (707) 628 0452 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Acc West Coast & Ragnar Benson A Joint Venture | Civil Constructors West Coast LLC American | — | (707) 746 8028 | Electricians | Benicia · Solano County | — | — |
| Accessibility Service Company | Brian Shane Hofacre | — | (707) 246 4214 | Other | Fairfield · Solano County | — | — |
| Accurate Elevators LLC | David Patrick Ferguson | — | (714) 791 9884 | Other | Fairfield · Solano County | — | — |
| Acha Construction | Javier Antonio Acha | — | (925) 876 2242 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Acme Glass Co INC | Eric Anthony Wortman | — | (707) 422 3626 | Windows, patio, painters | Fairfield · Solano County | — | — |
| Acosta Glass LLC | Acosta Francisco | contact@acostaglass.com | (707) 678 7244 | Windows, patio, painters | Dixon · Solano County | — | — |
| Acr Construction Services | Richard Barry Jabour | — | (707) 514 3291 | GC, remodel, ADU | Vacaville · Solano County | — | — |