| Adameck HVAC INC | Adam Christian Eckenwiler | — | (707) 266-1033 | HVAC | Napa · Napa County | — | — |
| Adams Construction | Kenneth Nick Adams | — | (707) 648 1768 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| Adams Electric INC | Carter Glenn Williams | — | (707) 252 4280 | Electricians | Napa · Napa County | — | — |
| Adl Construction | De Leon Arturo | — | (707) 738 8206 | GC, remodel, ADU | Napa · Napa County | — | — |
| Adrian Arias Custom Tile Stone | Adrian Arias Custom Tile Stone | — | (707) 815 8029 | Other | Napa · Napa County | — | — |
| Advance Landscaping | Advance Landscaping | — | (707) 342 2987 | Windows, patio, painters | American Canyon · Napa County | — | — |
| Advanced Construction Services Group LLC | Robert Duane Council | — | (707) 347 9887 | GC, remodel, ADU | Napa · Napa County | — | — |
| Advanced Construction Techniques | Normand Ernest Jr Forcier | contact@agtgroup.com | (707) 481 7392 | GC, remodel, ADU | Napa · Napa County | — | — |
| Advanced Roofing Company INC | Jesse Gutierrez Tijero | jesse@advancedroofingnapa.com | (707) 254 9574 | Other roofers | Napa · Napa County | — | — |
| Affordable Arborists | Affordable Arborists | candice@affordablearborists.com | (707) 898-5598 | Tree | Napa · Napa County | — | — |
| Ag Builders LLC | Alejandro Javier Gonzalez Barragan | — | (707) 639 2020 | GC, remodel, ADU | Napa · Napa County | — | — |
| Ag Construction | Guandulain Antonio | — | (707) 235 6364 | GC, remodel, ADU | Napa · Napa County | — | — |
| Ag Painting | Ag Painting | — | (707) 694 6343 | Windows, patio, painters | American Canyon · Napa County | — | — |
| Ags Roofing INC | Luis Mariano Cardona Reyes | — | (707) 690 9059 | Other roofers | Napa · Napa County | — | — |
| Al Campbell DBA Campbell Enterprises | Aldon Berton Campbell | — | (707) 333 4655 | Pool | Napa · Napa County | — | — |
| Alacin Enterprises INC | Alan Joseph Skinner | — | (707) 224 5912 | GC, remodel, ADU | Napa · Napa County | — | — |
| Alan Ogden | Alan Ogden | — | (707) 812 8926 | GC, remodel, ADU | Napa · Napa County | — | — |
| Aldape Heating And Air Conditioning | Aldape Heating And Air Conditioning | — | (707) 980 2999 | HVAC | American Canyon · Napa County | — | — |
| Alden Electric Co | Kevin Alden Miller | curt@aldenelectric.com | (707) 313 5221 | Electricians | Napa · Napa County | — | — |
| Alexian Construction | Alexian Arameh | — | (415) 539 6767 | GC, remodel, ADU | Napa · Napa County | — | — |
| All Aloha Painting | All Aloha Painting | — | (707) 494 4852 | Windows, patio, painters | Napa · Napa County | — | — |
| All American Painting Co | Joseph Arch Smith | — | (707) 252 8604 | Windows, patio, painters | Napa · Napa County | — | — |
| All Style Tile | All Style Tile | — | (707) 227 5500 | Other | Napa · Napa County | — | — |
| All Weather Painting | All Weather Painting | — | (707) 479 6998 | Windows, patio, painters | Napa · Napa County | — | — |
| Allweld Metal Fabrication INC | Matthew Joseph Petrini | — | (707) 252 7875 | Other | Napa · Napa County | — | — |
| Almaraz Construction INC | Menfil Freiny Almaraz | — | (707) 235 2338 | GC, remodel, ADU | Napa · Napa County | — | — |
| Alpine Premium Construction | Arsenic Aleksandra | — | (408) 859 3466 | GC, remodel, ADU | Pope Valley · Napa County | — | — |
| Altura Construction INC | Michael Joseph Richardson | — | (707) 255 7790 | GC, remodel, ADU | Napa · Napa County | — | — |
| Always Green Landscaping & Design | Always Green Landscaping & Design | — | (707) 342 6123 | Windows, patio, painters | American Canyon · Napa County | — | — |
| Ama Pro Builder | Ama Pro Builder | — | (707) 927 6101 | GC, remodel, ADU | Napa · Napa County | — | — |
| Amato Electric | Thomas Joseph Amato | — | (707) 888 7557 | Electricians | St Helena · Napa County | — | — |
| American Canyon Builders INC | Ricci Sal Armijo | — | (707) 246 0343 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| American Eagle Ent | Pamela Jean Kincanon | aebleachers@gmail.com | (916) 434 6561 | GC, remodel, ADU | Napa · Napa County | — | — |
| American Electric | Jeremiah Daniel Bennett | — | (707) 319 2599 | Electricians | Napa · Napa County | — | — |
| American Lady Vets Services INC | Ruth Lainez-Blanco | — | (951) 208 4484 | Windows, patio, painters | American Canyon · Napa County | — | — |
| American Sunny Construction | Jianfu Chen | — | (707) 997 0037 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| Angelos Roofing INC | Brian Angelo Cravea | — | (707) 244 7663 | Other roofers | Napa · Napa County | — | — |
| Anthony Dean Gliedt | Anthony Dean Gliedt | — | (925) 516 8717 | GC, remodel, ADU | Napa · Napa County | — | — |
| Anthony's Plumbing Of Napa | Anthony's Plumbing Of Napa | — | (707) 815 2567 | Other | Napa · Napa County | — | — |
| Apex Construction Services Inc. | Apex Construction Services Inc. | — | (760) 634-6589 | Pool | Oceanside · Napa County | — | — |