| Paradise Painting | Paradise Painting | — | (530) 340 3684 | Windows, patio, painters | Yreka · Siskiyou County | — | — |
| Parrita's Landscaping | Parrita's Landscaping | — | (530) 340 5198 | Windows, patio, painters | Mount Shasta · Siskiyou County | — | — |
| Patrick K Olson Construction | Patrick Kevin Olson | — | (530) 925 1426 | GC, remodel, ADU | Mount Shasta · Siskiyou County | — | — |
| Payton Dickinson | Payton Dickinson | — | (530) 643 1011 | GC, remodel, ADU | Etna · Siskiyou County | — | — |
| Pearson Excavating | Pearson Excavating | — | (541) 646 8367 | Other | Callahan · Siskiyou County | — | — |
| Perfectionist Construction | Perfectionist Construction | — | (530) 340-3578 | Restoration | Yreka · Siskiyou County | — | — |
| Performance Flooring | Performance Flooring | sales@performance-flooring.co.uk | (530) 859 0147 | Other | Mt Shasta · Siskiyou County | — | — |
| Performance Insulation | Performance Insulation | — | (530) 340 3544 | Other | Montague · Siskiyou County | — | — |
| Phil Walsh Contruction | Phil Walsh Contruction | — | (530) 859 2050 | GC, remodel, ADU | Mc Cloud · Siskiyou County | — | — |
| Phillips Renovation & Remodeling | Robert Bradbury Phillips | — | (720) 771 8501 | GC, remodel, ADU | Weed · Siskiyou County | — | — |
| Pigoni Corporation DBA Mark's Heating And Cooling | Mark Daniel Pigoni | — | (530) 925 9868 | HVAC | Mt Shasta · Siskiyou County | — | — |
| Pine Ridge Construction INC | Canada Darcy Budley Ross | — | (530) 925 2336 | GC, remodel, ADU | Mt Shasta · Siskiyou County | — | — |
| Pipetrades North LLC | Roger James Gifford | — | (530) 340 1395 | HVAC | Hornbrook · Siskiyou County | — | — |
| Pooh Bear's Repairs INC | Bear Pooh | — | (530) 598 8800 | GC, remodel, ADU | Yreka · Siskiyou County | — | — |
| Potts Construction | Keith Paul Potts | — | (530) 604 4455 | GC, remodel, ADU | Mount Shasta · Siskiyou County | — | — |
| Power-rite Electric | Fred Seymour Babcock | — | (530) 859 5318 | Electricians | Mt Shasta · Siskiyou County | — | — |
| Precision Property Maintenance | Precision Property Maintenance | — | (530) 386 6615 | Electricians | Hornbrook · Siskiyou County | — | — |
| Premier Clearing INC | Aaron Joseph Einsele | — | (530) 340 0277 | Other | Yreka · Siskiyou County | — | — |
| Progressive Construction & Design | Gary Marshall Gress | — | (707) 483 1099 | GC, remodel, ADU | Dunsmuir · Siskiyou County | — | — |
| R B Aldrich Construction | Richard Bruce Aldrich | — | (530) 468 5649 | GC, remodel, ADU | Fort Jones · Siskiyou County | — | — |
| R B Construction | Richard Allen Jr Black | — | (530) 643 6490 | GC, remodel, ADU | Montague · Siskiyou County | — | — |
| R G P Roofing | Russel Lynn Willis | — | (530) 722 7515 | Other roofers | Weed · Siskiyou County | — | — |
| R J Pelletier Construction INC | Raymond John Pelletier | — | (530) 926 2609 | GC, remodel, ADU | Mt Shasta · Siskiyou County | — | — |
| R L Construction Services | Donald Richard Jr Loader | — | (530) 925 8008 | GC, remodel, ADU | Mt Shasta · Siskiyou County | — | — |
| R W Construction | Randal Hiram Wright | — | (530) 261 0342 | GC, remodel, ADU | Gazelle · Siskiyou County | — | — |
| Rachel Streeter | Rachel Streeter | — | (541) 683 2854 | Other | Mount Shasta · Siskiyou County | — | — |
| Ran - Can Construction | Randy Joel Young | — | (530) 340 8351 | GC, remodel, ADU | Hornbrook · Siskiyou County | — | — |
| Ray Mac Mechanical INC | John Clark Mc Dowell | clerk@raymacmechanical.com | (530) 926 5228 | Other roofers | Mt Shasta · Siskiyou County | — | — |
| Raymond James Arkie | Raymond James Arkie | — | (530) 261 0007 | GC, remodel, ADU | Weed · Siskiyou County | — | — |
| Raymond V Zanni | Raymond V Zanni | — | (530) 859 0375 | GC, remodel, ADU | Mc Cloud · Siskiyou County | — | — |
| Reed Painting INC | Robert Montgomery Reed | — | (530) 938 2152 | Windows, patio, painters | Weed · Siskiyou County | — | — |
| Reliable Plumbing | Reliable Plumbing | — | (530) 340 0183 | GC, remodel, ADU | Montague · Siskiyou County | — | — |
| Rex Cozzalio | Rex Cozzalio | — | (530) 598 0456 | GC, remodel, ADU | Hornbrook · Siskiyou County | — | — |
| Rice Excavating | Rice Excavating | — | (530) 598 4368 | Other | Etna · Siskiyou County | — | — |
| Rich Leach Custom Concrete INC | Richard Charles Leach | — | (530) 598 2400 | Other | Grenada · Siskiyou County | — | — |
| Richard Smith General Contractor | Richard Smith General Contractor | — | (650) 796 4167 | GC, remodel, ADU | Mc Cloud · Siskiyou County | — | — |
| Rick Stretz Electric INC | Rick Stretz Electric INC | — | (530) 842-3332 | Electricians | Yreka · Siskiyou County | — | — |
| Rizzardo Construction LLC | Stephen Joseph Rizzardo | — | (530) 356 3348 | GC, remodel, ADU | Yreka · Siskiyou County | — | — |
| Rizzardo Roofing Gutters And Tree Service | Mario Nathan Rizzardo | — | (530) 598 3099 | Other roofers | Fort Jones · Siskiyou County | — | — |
| Rmo Construction INC | Robert Michael O'gorman | — | (530) 842 1627 | GC, remodel, ADU | Yreka · Siskiyou County | — | — |