| Archibald Excavating & Grading INC | Dakota Jordan Archibald | — | (530) 638 5100 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| Arcsine Engineering | Richard Scott Philben | — | (530) 222 7204 | Electricians | Redding · Shasta County | — | — |
| Arden's Tree Service | Arden Lee Anderson | — | (530) 209 7684 | Tree | Cottonwood · Shasta County | — | — |
| Ariamen INC | Azizollah Barzin | — | (530) 524 5434 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Ark Design Construction And Roofing INC | Joseph Adrian Van Sweden | — | (530) 547 3890 | Other roofers | Palo Cedro · Shasta County | — | — |
| Armet Alarm & Electronic INC | Armet Alarm & Electronic INC | — | (818) 242-0022 | Alarm and generators | Glendale · Shasta County | — | — |
| Arrow Construction | Daniel Ben Apecechea | info@arrow-construction.com | (530) 524 8907 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Arrowhead Tile | Arrowhead Tile | arrowheadtile1@aol.com | (530) 949 4475 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Art Of The Craft Lath And Plaster | Daren Christopher Warren | — | (530) 949 8641 | Other | Redding · Shasta County | — | — |
| Artifex Woodwerx INC | Darin Travis Hale | — | (530) 355 7036 | Other | Anderson · Shasta County | — | — |
| Arts Plastering | Arts Plastering | — | (530) 243 4604 | Other | Shasta Lake · Shasta County | — | — |
| Arvid Engstrom Construction | Arvid Carl Engstrom | arvidengstrom24@gmail.com | (530) 945 1008 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| Asap Redding Heating & Cooling | Asap Redding Heating & Cooling | — | (530) 440 1955 | HVAC | Redding · Shasta County | — | — |
| Ascension Building | Ascension Building | — | (530) 209 7007 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Ascension Construction | Jordan Justus Ferrier | — | (503) 586 8270 | Other roofers | Anderson · Shasta County | — | — |
| Associated Contracting | Mack Dean Goekler | info@associatedcontracting.com | (757) 465-1440 | GC, remodel, ADU | Shasta Lake · Shasta County | — | — |
| Audio Video Alternatives | Audio Video Alternatives | — | (530) 638 6659 | Other | Redding · Shasta County | — | — |
| Austin Cade Carter Fencing | Austin Cade Carter Fencing | — | (530) 227 4472 | Other | Redding · Shasta County | — | — |
| Austin Lobue Construction | Austin Michael Lobue | austinlobueconstruction@yahoo.com | (530) 602 2514 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Authority Property Management | Authority Property Management | info@authoritypm.com | (530) 410-6085 | Property managers | Redding · Shasta County | — | — |
| Automated Electrical Systems | James Patrick Adams | — | (530) 605 9927 | Electricians | Redding · Shasta County | — | — |
| Ava K Early | Ava K Early | — | (530) 365 5848 | Other | Redding · Shasta County | — | — |
| Awesome Choice INC | Erie Charles Chambers | — | (530) 355 8994 | Electricians | Cottonwood · Shasta County | — | — |
| Axner Excavating INC | Cynthia Diane Axner | axner@shasta.com | (530) 222 0539 | Other | Redding · Shasta County | — | — |
| Aztec Construction & Restoration | Thomas James Conner | — | (530) 275 3327 | GC, remodel, ADU | Redding · Shasta County | — | — |
| B & M Electric | Robert Anthony Michoff | — | (530) 949 4763 | Electricians | Redding · Shasta County | — | — |
| B And P Fencing INC | Scott James Porter | — | (530) 949 4920 | Other | Anderson · Shasta County | — | — |
| B J H Construction INC | John Joseph Jr Hutchens | — | (530) 524 0763 | Other | Cottonwood · Shasta County | — | — |
| B K Construction | Bruce Frank Knabenshue | — | (530) 515 2648 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| B K Flooring | B K Flooring | — | (530) 338 7853 | Other | Redding · Shasta County | — | — |
| B T Construction | Brian Thomas Taylor | — | (530) 945 5867 | Other | Redding · Shasta County | — | — |
| B&c Electric | Robert Daniel Kwake | — | (530) 510 6016 | Electricians | Redding · Shasta County | — | — |
| Bacciarini Plumbing | Bacciarini Plumbing | — | (530) 949 9971 | Other | Redding · Shasta County | — | — |
| Backcountry Excavating | Backcountry Excavating | sales@backcountrygroup.ca | (530) 355 1607 | Other | Redding · Shasta County | — | — |
| Backyard Escapes | Bradley Austin Luff | — | (530) 222 7226 | Windows, patio, painters | Redding · Shasta County | — | — |
| Balkes Roofing INC | Johnathon Louis Balke | amkryukov@gmail.com | (530) 945 8487 | Other roofers | Cottonwood · Shasta County | — | — |
| Barentine & Sons Engineering | Boyd Lee Barentine | — | (530) 227 6186 | Other | Cottonwood · Shasta County | — | — |
| Barnett Construction | Harold Lee Barnett | — | (530) 941 4107 | Electricians | Palo Cedro · Shasta County | — | — |
| Barrett Plumbing | Barrett Plumbing | interested@domainmarket.com | (530) 440 4849 | Other | Shasta Lake · Shasta County | — | — |
| Barry's Landscape/maintenance | Barry's Landscape/maintenance | — | (530) 347 0816 | Windows, patio, painters | Cottonwood · Shasta County | — | — |