| 3 Kings Builders LLC | Mark Andrew Reyes | mail@kings-builders.com | (415) 713 6223 | GC, remodel, ADU | Napa · Napa County | — | — |
| 7 Roots Landscaping | 7 Roots Landscaping | — | (707) 337 9257 | Windows, patio, painters | Napa · Napa County | — | — |
| 707 Ramz Construction INC | Francisco Ramirez-Guzman | daniel@ramzconstruction.com | (707) 927 6618 | GC, remodel, ADU | Napa · Napa County | — | — |
| A & E Pool DBA A & E Pool Care | Hugo Norberto Sanchez | — | (707) 227 0787 | Pool | American Canyon · Napa County | — | — |
| A & F Electrical Construction INC | Craig Ryan Fry | — | (707) 257 1286 | Electricians | Napa · Napa County | — | — |
| A & J Quality General Construction Services | Jacqueline Lourdes Romero | — | (510) 871 5842 | GC, remodel, ADU | American Canyon · Napa County | — | — |
| A & L Electric | Anthony Nicholas Ratto | — | (209) 483 2148 | Electricians | Napa · Napa County | — | — |
| A & R Construction | Richard James Hasty | — | (707) 301 7124 | GC, remodel, ADU | Napa · Napa County | — | — |
| A & S Plumbing INC | Armando Salinas | — | (707) 696 9284 | Other | Napa · Napa County | — | — |
| A - Z Pro Landscaping | A - Z Pro Landscaping | — | (510) 461 4592 | Windows, patio, painters | American Canyon · Napa County | — | — |
| A C Fence | A C Fence | — | (707) 738 4769 | Other | American Canyon · Napa County | — | — |
| A E Quality Painting Co | Esquivel Alfonso | — | (707) 318 7982 | Windows, patio, painters | Napa · Napa County | — | — |
| A G Isdahl Construction INC | Andy George Isdahl | — | (707) 975 7431 | GC, remodel, ADU | Rutherford · Napa County | — | — |
| A J F Contracting INC | Aaron John Fernandez | — | (707) 319 4190 | GC, remodel, ADU | Napa · Napa County | — | — |
| A K Painting | A K Painting | — | (707) 332 5416 | Windows, patio, painters | Napa · Napa County | — | — |
| A M P Construction | Robert David Poppe | — | (707) 337 4115 | GC, remodel, ADU | Napa · Napa County | — | — |
| A P C Services Of Napa | Robert Kenneth Carter | — | (707) 312 0417 | GC, remodel, ADU | Napa · Napa County | — | — |
| A R K Electric | Aaron Roy Kingsford | — | (707) 255 4394 | Electricians | Napa · Napa County | — | — |
| A R Painting | A R Painting | — | (707) 304 0564 | Windows, patio, painters | Angwin · Napa County | — | — |
| A T S | Peter Francis Murphy | — | (707) 337 3190 | Other | Napa · Napa County | — | — |
| A V Construction Co | Alec Lyman Gingery | — | (707) 974 7400 | GC, remodel, ADU | Calistoga · Napa County | — | — |
| A V E | Brian Lee Weston | — | (707) 253 7703 | Other | Napa · Napa County | — | — |
| A's Landscaping | A's Landscaping | — | (707) 363 2562 | Windows, patio, painters | St Helena · Napa County | — | — |
| A+ Waterworks INC | Nasser Zaid Nijem | — | (707) 249 8987 | Other | American Canyon · Napa County | — | — |
| A1 Welding Services | Adam Daniel Aitchison | — | (707) 373 0096 | Other | American Canyon · Napa County | — | — |
| Aaa Next Level Construction | Stefan Michael Walkowiak | — | (619) 450 9438 | GC, remodel, ADU | Napa · Napa County | — | — |
| Aaa Organized Plumbing Napa | Michael Joseph Jennaro | — | (209) 601 0734 | Other | Napa · Napa County | — | — |
| Abbey Carpets Unlimited | John Stephen Hartley | — | (707) 261 8000 | GC, remodel, ADU | Napa · Napa County | — | — |
| Abbott Custom Electric | Caymus Jordan Abbott | contact@abbottcustomelectric.com | (707) 363 8364 | Electricians | Napa · Napa County | — | — |
| Abc Sewer Solutions | Abc Sewer Solutions | — | (707) 226 3166 | Other | Napa · Napa County | — | — |
| Abel's Roofing | Vazquez-garcia Abel | — | (707) 812 4006 | Other roofers | Napa · Napa County | — | — |
| Abernethy Brothers Construction INC | James Patrick Abernethy | — | (707) 226 2605 | GC, remodel, ADU | Napa · Napa County | — | — |
| Abernethy Construction INC | Charles Michael Abernethy | — | (707) 815 9120 | GC, remodel, ADU | Napa · Napa County | — | — |
| Ac/dc Electric INC | Salvador Jr| Alcaraz Sal Alcaraz | — | (408) 368 1034 | Electricians | Napa · Napa County | — | — |
| Ace Concrete & Sons | Ace Concrete & Sons | — | (707) 927 5427 | Other | Napa · Napa County | — | — |
| Acg Construction | Gail Yvonne Otis | — | (707) 258 6277 | GC, remodel, ADU | Napa · Napa County | — | — |
| Ach Pro Mechanical | Joshua Boe Gayski | — | (707) 880 9119 | HVAC | Napa · Napa County | — | — |
| Acme Electric | Jimmy Dowl Hollabaugh | — | (707) 974 4013 | Electricians | Yountville · Napa County | — | — |
| Acme Engineering Incorporated DBA Acme Pump And Water Service | Jon Michael Terry | — | (707) 253 2263 | Other | Napa · Napa County | — | — |
| Acosta Landscaping | Acosta Landscaping | acostalawncare@gmail.com | (707) 293 3038 | Windows, patio, painters | Rutherford · Napa County | — | — |