| 1 Of A Kine Wood Construction | Goodman Jason | — | (530) 638 6954 | GC, remodel, ADU | Cottonwood · Shasta County | — | — |
| 3D Construction | Christopher Michael Moore | — | (530) 604 9593 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| 3sd | Stewart Shane Schneider | — | (530) 597 6427 | Electricians | Anderson · Shasta County | — | — |
| 4 Seasons Painting | Todd Robert Groff | — | (530) 921 8406 | Windows, patio, painters | Redding · Shasta County | — | — |
| 40 Traffic & Construction INC | Steven Ray Forde | — | (530) 639 9987 | Other | Anderson · Shasta County | — | — |
| 4M Development Ventures INC | Gary Lee Mitchell | — | (530) 547 5875 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |
| 4th Amendment Fencing | Aaron Douglas Souza | — | (530) 949 7765 | Other | Cottonwood · Shasta County | — | — |
| 89 Construction LLC | Eric Zoek Hua Cheung | — | (415) 990 9138 | GC, remodel, ADU | Redding · Shasta County | — | — |
| A & M Pressure Washing INC | Patty Mayer | — | (530) 244 4642 | Other | Redding · Shasta County | — | — |
| A & R Heating & Air Conditioning INC | Bradley Allen Reeder | — | (530) 246 9777 | HVAC | Redding · Shasta County | — | — |
| A & S Heating And Air | Ian Edward Allen | — | (530) 567 9720 | HVAC | Anderson · Shasta County | — | — |
| A - 1 Crane Service | Richard Le Roy Van Cleave | — | (530) 347 6947 | Other | Cottonwood · Shasta County | — | — |
| A 1 Painting | A 1 Painting | — | (530) 244 2595 | Windows, patio, painters | Redding · Shasta County | — | — |
| A C Framers INC | Jessaca Joleen Lugo | — | (530) 242 3930 | Other | Redding · Shasta County | — | — |
| A F P Sprinklers INC | Kenneth Edward Gonzalez | — | (530) 605 4760 | Other | Redding · Shasta County | — | — |
| A J Hand Construction | Aaron Jack Hand | — | (530) 275 9224 | GC, remodel, ADU | Redding · Shasta County | — | — |
| A R Landscape Design | A R Landscape Design | areyeslandscapedesign@gmail.com | (530) 344 6418 | Windows, patio, painters | Redding · Shasta County | — | — |
| A To Z Services | Miles Marvin Koenig | — | (530) 524 0464 | Other | Redding · Shasta County | — | — |
| A W Harding | A W Harding | — | (408) 315 9947 | GC, remodel, ADU | Anderson · Shasta County | — | — |
| A-1 Electric | Nathan Lewis Cole | — | (530) 244 9229 | Electricians | Redding · Shasta County | — | — |
| A.r.c | Alexander William Ruess | — | (530) 209 0441 | Other | Redding · Shasta County | — | — |
| Aaron Keeran Construction | Aaron Knight Keeran | — | (530) 275 4564 | Other | Bella Vista · Shasta County | — | — |
| Aax Alarm | Bradley Alan Souza | — | (530) 917 8556 | Electricians | Redding · Shasta County | — | — |
| Abacus Construction INC | Garret Ryan Langum | — | (530) 215 3104 | Other | Redding · Shasta County | — | — |
| Abc Pools | Abc Pools | — | (530) 917 7756 | Pool | Redding · Shasta County | — | — |
| Able Construction | David George Christ | — | (530) 200 1963 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Above All Property Services INC | Juan Jose C Olmos | info@aboveallpropertyservices.com | (949) 584 0092 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Above And Beyond Landscaping | Above And Beyond Landscaping | — | (530) 917 5983 | Windows, patio, painters | Redding · Shasta County | — | — |
| Above Board Construction & Roofing INC | Carl Ventley Iv Hawkins | — | (530) 605 3400 | Other roofers | Redding · Shasta County | — | — |
| Abraham Baugh | Abraham Baugh | — | (530) 999 1647 | Other | Oak Run · Shasta County | — | — |
| Abrams Flooring | Abrams Flooring | — | (530) 440 2505 | Other | Redding · Shasta County | — | — |
| Absolute Comfort Heating And Air Conditioning INC | Clyde Dean Haltom | — | (530) 241 7703 | HVAC | Redding · Shasta County | — | — |
| AC Tractor INC | Anthony Lee Cox | — | (408) 891 0983 | Other | Redding · Shasta County | — | — |
| Accent Quality Fence | Accent Quality Fence | — | (530) 365 8511 | Other | Cottonwood · Shasta County | — | — |
| Ace Low Voltage Systems | Ace Low Voltage Systems | — | (707) 478 0844 | Other | Shasta Lake · Shasta County | — | — |
| Ackerman Construction | Randy Lee Ackerman | interested@domainmarket.com | (530) 515 0152 | GC, remodel, ADU | Millville · Shasta County | — | — |
| Acs General Engineering | Acs General Engineering | — | (530) 215 5628 | Other | Cottonwood · Shasta County | — | — |
| Action Electric | Mark Edward Winstead | — | (530) 356 3049 | Electricians | Shasta Lake · Shasta County | — | — |
| Action Gypsum Supply West LLC | Daniel Lyle Batman | — | (530) 941 3667 | GC, remodel, ADU | Redding · Shasta County | — | — |
| Adam Whelen Construction | Adam Christopher Whelen | — | (530) 355 9956 | GC, remodel, ADU | Palo Cedro · Shasta County | — | — |