| All Trade Construction And Mobile Home Setup | Ronald Patrick Robbings | — | (530) 365 6118 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Allegiance Electric | Brian Alan Raley | — | (858) 717 3555 | Electricians | Redding · Shasta County | — | — |
| Allen Berlt's Rock Wall's | Allen Berlt's Rock Wall's | — | (916) 879 0553 | Other | Burney · Shasta County | — | — |
| Allen Gill Construction INC | Allen Scott Gill | — | (530) 547 1112 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| Allenair Heating And Cooling | Allenair Heating And Cooling | — | (530) 808 5798 | HVAC | Redding · Shasta County | — | — |
| Allianz Heating & Air INC | Royal Decker Hawkley | — | (530) 221 2642 | HVAC | Redding · Shasta County | — | — |
| Allied Construction | Michael Troy Sieglock | info@alliedconstruction.com | (530) 355 4784 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Allied Painting | John Allan Lago | — | (707) 484 4849 | Windows, patio, painters | Shingletown · Shasta County | — | — |
| Alliger Plumbing & Fire Protection INC | Kylin Edward Alliger | — | (530) 604 6516 | Other | Redding · Shasta County | — | — |
| Allison Construction | John Michael Allison | — | (530) 605 6159 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Aloha Design Pools Of Redding | Aloha Design Pools Of Redding | — | (530) 410 3988 | Pool | Redding · Shasta County | — | — |
| Alpha Communications LLC | Derek Cole Lynch | — | (530) 941 3217 | Other | Redding · Shasta County | — | — |
| Alta Up Painting | Alta Up Painting | — | (925) 234 5053 | Windows, patio, painters | Redding · Shasta County | — | — |
| Alva's Carpet Laying | Alva's Carpet Laying | — | (530) 274 2274 | Other | Redding · Shasta County | — | — |
| Alvarez Lathing & Plastering INC | Alvarez Pedro Alvarez | — | (530) 351 5319 | Other | Redding · Shasta County | — | — |
| Ambient INC | William Michael Scott | — | (530) 227 4361 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Aments Anytime Plumbing | Aments Anytime Plumbing | — | (530) 347 5030 | Other | Cottonwood · Shasta County | — | — |
| American Concrete Placement Company | Brian Paul Kamisky | — | (530) 378 5317 | Other | Anderson · Shasta County | — | — |
| American Door Company INC | William George Jr Fuentes | — | (530) 224 1640 | Other | Redding · Shasta County | — | — |
| American Flooring Installations INC | Larry Paul Marvel | — | (530) 227 4361 | Other | Redding · Shasta County | — | — |
| American General Painting Contractors | Daniel George Turturici | — | (530) 917 6097 | Windows, patio, painters | Redding · Shasta County | — | — |
| American Leak Detection | Joseph Bennett Bates | — | (530) 222 5325 | Other | Redding · Shasta County | — | — |
| American Roofing | American Roofing | — | (951) 306-9387 | Other roofers | San Jacinto · Shasta County | — | — |
| American Traffic & Safety INC | Antoinette Ranee Donnelly | — | (530) 209 9276 | Other | Anderson · Shasta County | — | — |
| American West Painting | American West Painting | — | (530) 440 1431 | Windows, patio, painters | Shasta Lake · Shasta County | — | — |
| Anderson Heating And Cooling | Mark Eugene Dulong | — | (530) 365 3600 | HVAC | Anderson · Shasta County | — | — |
| Anderson Landscaping Services | Bruce Anthony Anderson | — | (530) 244 7591 | Windows, patio, painters | Redding · Shasta County | — | — |
| Andrew Begley Electric | Andrew Gavin Begley | a.begleyelectric@outlook.com | (530) 941 5765 | Electricians | Cottonwood · Shasta County | — | — |
| Andrew Brundage Cabinetry | Andrew Lee Brundage | — | (530) 999 1730 | Other | Redding · Shasta County | — | — |
| Andrews Construction | Andrew Paul Thomas | interested@domainmarket.com | (925) 324 0132 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Angel Engineering Constructor's | Angel Engineering Constructor's | — | (530) 410 5170 | Other | Shasta Lake · Shasta County | — | — |
| Angelos Plumbing Services LLC | Angelo Saverio Duran | — | (530) 782 4033 | Other | Redding · Shasta County | — | — |
| Anthony Rider Electric | Anthony Robert Rider | — | (530) 953 7481 | Electricians | Redding · Shasta County | — | — |
| Anthony's Window Cleaning | Anthony's Window Cleaning | — | (530) 524 0174 | Other | French Gulch · Shasta County | — | — |
| Antone James Garnero DBA A G Blade Service | Antone James Garnero | — | (530) 227 1866 | Other | Redding · Shasta County | — | — |
| Apex Fence Co INC | James Lee Casner | — | (530) 365 3316 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| Apex Heating And Air Conditioning INC | Jesse Scott Duval | — | (530) 355 1524 | HVAC | Redding · Shasta County | — | — |
| Apro2call - Enterprises | Stephan Michael Flatt | — | (530) 604 3420 | Windows, patio, painters | Redding · Shasta County | — | — |
| Aqueous Vets LLC | Aaron Richard Dingman | — | (925) 331 0573 | Other | Redding · Shasta County | — | — |
| Arbiso's Asphalt Services | Jeremy Mitchell Arbiso | — | (530) 941 3078 | Other | Cottonwood · Shasta County | — | — |