| A & B Grading Solutions | Josh Dean Hays | — | (530) 640 0468 | Other | Alturas · Modoc County | — | — |
| A & M Pump & Plumbing | William Kenneth Roberts | — | (530) 233 2773 | Other | Alturas · Modoc County | — | — |
| A Tac Exterminators Inc. | A Tac Exterminators Inc. | — | (949) 633-8475 | Pest, tile roofs | Beaumont · Modoc County | — | — |
| Action Plumbing Service | Thomas Walter Krauss | — | (510) 410 2729 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Alturas Roofing & Construction | Alturas Roofing & Construction | eben@eyebytes.com | (905) 673-0476 | Other roofers | Alturas Ca · Modoc County | — | — |
| Ben Gooch | Ben Gooch | — | (530) 640 0347 | GC, remodel, ADU | Cedarville · Modoc County | — | — |
| Big Dog Electric | Aaron David Teuscher | — | (530) 640 1915 | Electricians | Alturas · Modoc County | — | — |
| Budmark Construction | Derrick Joshua Budmark | — | (530) 640 1030 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Bullet Construction | Kevin Scott Banwarth | — | (530) 260 0356 | GC, remodel, ADU | Adin · Modoc County | — | — |
| C Lindquist Construction | Charles Robert Lindquist | — | (775) 220 3132 | GC, remodel, ADU | Cedarville · Modoc County | — | — |
| C R Customs | C R Customs | — | (530) 708 0588 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| C8 Custom Metal LLC | Casey Ray Cockrell | — | (530) 708 7079 | Other | Alturas · Modoc County | — | — |
| Calturas Construction | Joseph Willard Horst | — | (530) 640 3363 | Other roofers | Alturas · Modoc County | — | — |
| Calturas Construction Homes LP | Isaac Joseph Sanders | — | (530) 640 3363 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Cascade Fencing | Cascade Fencing | — | (530) 640 2768 | Other | Alturas · Modoc County | — | — |
| Coast Wide Contractors | James Robert Hertel | — | (530) 640 2016 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Cole Willis Joiner | Cole Willis Joiner | — | (530) 640 2364 | Other | Lookout · Modoc County | — | — |
| Community Builders | Community Builders | — | (530) 640 1531 | GC, remodel, ADU | Cedarville · Modoc County | — | — |
| Conners Well Drilling | Conners Well Drilling | — | (530) 299 3336 | Other | Adin · Modoc County | — | — |
| Conners Well Drilling | John Allen Conner | — | (530) 640 0521 | Other | Alturas · Modoc County | — | — |
| Copp's Irrigation INC | Thomas Todd Traphagan | — | (530) 299 3477 | Other | Adin · Modoc County | — | — |
| Dan Young Construction | Daniel Alan Young | — | (530) 708 7132 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| David A Schock Construction | David Aaron Schock | — | (530) 233 8256 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| David H Hunt Construction | David Harry Hunt | — | (530) 605 7438 | Other | Adin · Modoc County | — | — |
| David Young Construction | David Richard Young | — | (530) 708 0136 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Dewayne Urban Construction | Dewayne Dennis Urban | — | (916) 200 6795 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Doc's Pool & Spa | Doc's Pool & Spa | — | (760) 692-7727 | Pool | Fallbrook · Modoc County | — | — |
| Downing Cabinet Installation INC | Robert Kevin Downing | — | (530) 225 6583 | Other | Alturas · Modoc County | — | — |
| Dreamhome Construction & Inspections | Andrew Clyde Stocking | — | (831) 345 1775 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Dustin Titterington Construction | Dustin Kelly Titterington | — | (530) 233 0596 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Frank's Carpet And Furniture Company INC | James Lee Rollins | — | (530) 233 4422 | Other | Alturas · Modoc County | — | — |
| Gardiner And Gardiner INC | Aaron Christopher Gardiner | — | (707) 685 2379 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Garlinghouse Construction | Billy Joe Garlinghouse | — | (707) 499 2835 | GC, remodel, ADU | Adin · Modoc County | — | — |
| Get-her-done Construction | John Grayson Jr Clevinger | — | (530) 640 1515 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Gs Construction | Solorio Gonzalo | — | (530) 708 7212 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Guy Williams General Contractor | Guy Williams General Contractor | — | (530) 233 5625 | GC, remodel, ADU | Alturas · Modoc County | — | — |
| Heard Plumbing INC | Janice Louise Bartram | — | (530) 233 5181 | Other | Alturas · Modoc County | — | — |
| Intermountain Floors & Interiors | Intermountain Floors & Interiors | — | (530) 949 1940 | Other | Canby · Modoc County | — | — |
| Jason Diven Contracting | Diven Jason | — | (530) 640 2326 | GC, remodel, ADU | Lake City · Modoc County | — | — |
| Joe Lloyd General Contracting | Joseph David Lloyd | — | (530) 640 3960 | GC, remodel, ADU | Alturas · Modoc County | — | — |