| Praedium INC | Timothy Robert Cooper | — | (707) 272 9260 | Pool | Willits · Mendocino County | — | — |
| Prentice Gallery | Prentice Gallery | — | (707) 937-5205 | Windows, patio, painters | Mendocino · Mendocino County | — | — |
| Prestige Real Estate & Property Management | Prestige Real Estate & Property Management | info@prestigerepro.com | (707) 806-0851 | Property managers | Santa Rosa · Mendocino County | — | — |
| Preston Murphy Drywall | Preston Murphy Drywall | pmurphydrywall@aol.com | (707) 813 8069 | Other | Fort Bragg · Mendocino County | — | — |
| Prime Painting | Prime Painting | contact@sansoxygen.com | (707) 237 1230 | Windows, patio, painters | Redwood Valley · Mendocino County | — | — |
| Pro Comp Roofing INC | Nicholas Brian Wood | — | (707) 964 1718 | Other roofers | Fort Bragg · Mendocino County | — | — |
| Pro Metal Roof & Gutter Services | Victor Hugo Malagon Real | — | (707) 813 0499 | Other roofers | Fort Bragg · Mendocino County | — | — |
| Pro West Interior Services | Philip Earl Atkins | — | (707) 684 0061 | Other | Gualala · Mendocino County | — | — |
| Pyramid Builders & Custom Milling | Pyramid Builders & Custom Milling | — | (707) 272 7442 | GC, remodel, ADU | Potter Valley · Mendocino County | — | — |
| Pyramid Electric | Daniel Russ Jones | — | (707) 972 6022 | Electricians | Mendocino · Mendocino County | — | — |
| Qualcon Glazing INC | Travis Walker Swithenbank | ken@qualconglazing.com | (707) 964 5000 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Quality Electric Construction | Richard Andrew Billy | — | (707) 391 2466 | Electricians | Hopland · Mendocino County | — | — |
| Queen's Remodeling | Queen's Remodeling | — | (707) 391 6978 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| R & M Backhoe Service INC | Rick James Mayfield | — | (707) 462 9557 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| R - Dynamics | R - Dynamics | — | (925) 323 0118 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| R C Buechner | R C Buechner | — | (707) 292 9245 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| R D C Electric | Joshua Dale Cook | — | (760) 842 4278 | Electricians | Willits · Mendocino County | — | — |
| R Dashiell Construction | Rodney Blain Dashiell | — | (707) 272 7424 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| R Franco Construction INC | Ryan Anthony Franco | ryan@rfrancoconstruction.com | (707) 357 1830 | GC, remodel, ADU | Willits · Mendocino County | — | — |
| R J Builders | R J Builders | — | (707) 961 1347 | GC, remodel, ADU | Mendocino · Mendocino County | — | — |
| R M J Construction | Randy Michael Johnson | — | (707) 272 4875 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| R Muniz Construction | Roberto Chavez Muniz | — | (707) 391 8343 | GC, remodel, ADU | Redwood Valley · Mendocino County | — | — |
| R R Estrada | R R Estrada | — | (707) 322 3387 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| R V M Construction | Ryan Michael Vandermeulen | — | (269) 303 2248 | GC, remodel, ADU | Gualala · Mendocino County | — | — |
| R W A PC | Robert William Affinito | — | (707) 349 3386 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| R W Murray INC DBA A To Z Construction | Richard Wayne Murray | — | (707) 485 9650 | Other | Calpella · Mendocino County | — | — |
| Radiant Solar Technology INC | Sandy Teresa Silsbee | — | (707) 485 8359 | HVAC | Ukiah · Mendocino County | — | — |
| Randall Mc New Plumbing | Randall Mc New Plumbing | — | (747) 237 9073 | Other | Willits · Mendocino County | — | — |
| Randy Dorn Construction | Robert Murray Dorn | — | (707) 485 7567 | GC, remodel, ADU | Redwood Valley · Mendocino County | — | — |
| Rantala Heating And Sheet Metal INC | Galo Austin Villalpando | — | (707) 964 4025 | HVAC | Fort Bragg · Mendocino County | — | — |
| Rantala Plumbing | Rantala Plumbing | — | (707) 962 8353 | Other | Fort Bragg · Mendocino County | — | — |
| Ray Richards Construction | Ray Russell Richards | — | (707) 972 7952 | GC, remodel, ADU | Fort Bragg · Mendocino County | — | — |
| Rbt Electric | Robert Michael Toomey | — | (707) 972 9197 | Electricians | Willits · Mendocino County | — | — |
| Rcs Construction | Vernon Elliott Anderson | — | (707) 467 2010 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Redwood Coast Builders INC | Michael Thomas Hoover | — | (707) 513 6365 | GC, remodel, ADU | Ukiah · Mendocino County | — | — |
| Redwood Coast Construction | Nicholas Allan Major | — | (707) 684 6409 | GC, remodel, ADU | Albion · Mendocino County | — | — |
| Redwood Coast Tile | Redwood Coast Tile | — | (707) 494 0441 | Other | Fort Bragg · Mendocino County | — | — |
| Redwood Electrical Services/r E S | Jimenez Steven | — | (707) 354 3910 | Electricians | Willits · Mendocino County | — | — |
| Redwood Empire Reforestation INC | William Earl Dorrell | — | (707) 714 9491 | Tree | Redwood Valley · Mendocino County | — | — |
| Redwood Empire Roofing | Jeffrey Wayne Piver | info@redwoodempireroofing.com | (707) 467 1147 | Other roofers | Ukiah · Mendocino County | — | — |