| Astro Air Design INC | Dana Rae White | — | (916) 645 0882 | HVAC | Lincoln · Placer County | — | — |
| Astro Sealcoating | Ryan Austin Munoz | — | (530) 823 3330 | Other | Auburn · Placer County | — | — |
| Atiles & Sons LLC | Adam Kodi Atiles | — | (530) 320 0249 | Tree | Foresthill · Placer County | — | — |
| Atlas Building Solutions | William Wight Lasell | — | (916) 316 9995 | Other roofers | Loomis · Placer County | — | — |
| Atlas Engineering Construction | Dennis Lee Jr Stidman | — | (916) 717 5886 | Other | Lincoln · Placer County | — | — |
| Atlas General Construction INC | John Curtis Iii Brentt | — | (916) 879 6187 | GC, remodel, ADU | Auburn · Placer County | — | — |
| Atlas Painting | Atlas Painting | — | (408) 569 2764 | Windows, patio, painters | Roseville · Placer County | — | — |
| Atlas Quality Tree Care INC | Antonio Jr Ruiz | — | (916) 751 0869 | Tree | Rocklin · Placer County | — | — |
| Atlas Stucco | William Henry Baker | — | (916) 993-5438 | GC, remodel, ADU | Rocklin · Placer County | — | — |
| Atlas Weldco | Atlas Weldco | — | (916) 826 7415 | Other | Roseville · Placer County | — | — |
| Atog Construction Management INC | Robert James Duarte | — | (916) 849 0441 | GC, remodel, ADU | Auburn · Placer County | — | — |
| Atwood Hay Incorporated | Corbin Joshua Hensley | — | (916) 257 2747 | Electricians | Roseville · Placer County | — | — |
| Atzman's Painting | Atzman's Painting | — | (916) 240 9937 | Windows, patio, painters | Roseville · Placer County | — | — |
| Auburn Acoustical | Auburn Acoustical | — | (916) 704 0584 | GC, remodel, ADU | Colfax · Placer County | — | — |
| Auburn Electric INC | William Henry Trusty | — | (530) 888 6807 | Electricians | Auburn · Placer County | — | — |
| Auburn Family Construction | Steven Gerard Rowett | — | (530) 303-2574 | HVAC | Auburn · Placer County | — | — |
| Auburn Folsom Painting | David Roger Nolen | — | (530) 305 0826 | Windows, patio, painters | Applegate · Placer County | — | — |
| Auburn Foothills Construction | Auburn Foothills Construction | — | (530) 308-2410 | GC, remodel, ADU | Auburn · Placer County | — | — |
| Auburn Plumbing Company | David Wayne Shawl | — | (530) 367 4365 | Other | Foresthill · Placer County | — | — |
| Auburn Property Management | Auburn Property Management | — | (530) 450-3366 | Property managers | Auburn · Placer County | — | — |
| Auburn Roofing INC | James Donald Doughty | — | (530) 823 9900 | Other roofers | Auburn · Placer County | — | — |
| Aucari Painting Service | Timothy Curtis Ramsey | — | (916) 410 7793 | GC, remodel, ADU | Rocklin · Placer County | — | — |
| Audio Video Link LLC | Vladislav Sharikov | info@audiovideolink.com | (530) 214 9999 | Other | Rocklin · Placer County | — | — |
| Audio Video Systems | Audio Video Systems | — | (916) 223 3754 | Other | Loomis · Placer County | — | — |
| Auger Construction INC | William Glyn Auger | — | (279) 252 2837 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Auger Door And Building Supply INC | William Glyn Auger | — | (916) 869 8196 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Augere Enterprises | Vladislav Podgaetski | — | (916) 765 4709 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Aureum Restoration Group INC | Dale Ermal Myrick | — | (800) 335 1090 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Austin Construction | Paul Albert Iii Austin | — | (916) 247 1638 | GC, remodel, ADU | Colfax · Placer County | — | — |
| Austin Electrical Services | James Aaron Austin | — | (916) 850 5558 | Electricians | Roseville · Placer County | — | — |
| Austin Sheet Metal Works INC DBA Austin Heat & Air | Kerry Ann Austin | — | (916) 624 1749 | HVAC | Rocklin · Placer County | — | — |
| Authentic Welding & Fabrication | Authentic Welding & Fabrication | — | (530) 249 1875 | Other | Lincoln · Placer County | — | — |
| Automated Control INC | Ruben Efren Jr Rubio | — | (800) 850 4270 | HVAC | Lincoln · Placer County | — | — |
| Av Service Co | Bryan Randall Welsch | — | (916) 760 7000 | Other | Roseville · Placer County | — | — |
| Avallone Electric | Avallone Alessio | — | (916) 782 2345 | Electricians | Roseville · Placer County | — | — |
| Avatar Painting | Avatar Painting | — | (925) 864 2444 | Windows, patio, painters | Rocklin · Placer County | — | — |
| Avdix Construction INC | Semir Avdic | info@avdixconstruction.com | (916) 886 3202 | GC, remodel, ADU | Roseville · Placer County | — | — |
| Averys Welding | Averys Welding | — | (916) 847 8062 | Other | Roseville · Placer County | — | — |
| Aviary Bird Products | Eugene Charles Edwards | — | (916) 409 5412 | Other | Roseville · Placer County | — | — |
| Avico Group | Aleksandr Vladimirovic Vilchitsa | contact@avico-group.com | (916) 224 6633 | GC, remodel, ADU | Foresthill · Placer County | — | — |