| Pro-crete Builders INC | Marco Antonio Jr Martin Del Campo | office@procretebuilders.com | (707) 320 1394 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Professional Pools | Justin James Ramsey | office@professional-pools.com | (707) 447 6657 | Pool | Vacaville · Solano County | — | — |
| Progressive Builders | Progressive Builders | — | (707) 372 0516 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Proline Tile & Stone INC | Quintana Alberto Juarez | — | (707) 590 3901 | Other | Dixon · Solano County | — | — |
| Proper Power Electric | Forrest William Iv Fox | rattermanf@yahoo.com | (510) 414 6752 | Electricians | Fairfield · Solano County | — | — |
| Puente Builders INC | Rodrigo Puente Alonzo | — | (707) 342 9554 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Puente Landscaping | Puente Landscaping | — | (510) 932 5529 | Windows, patio, painters | Vallejo · Solano County | — | — |
| Puma Painting | Puma Painting | micah@micahrich.com | (707) 400 8193 | Windows, patio, painters | Vacaville · Solano County | — | — |
| Putman Electrical | Joey Lin Putman | — | (707) 372 3247 | Electricians | Vacaville · Solano County | — | — |
| Q Line Electric | Julio Cesar Chavez | — | (650) 207 0196 | Electricians | Fairfield · Solano County | — | — |
| Q&m Builders INC | Charles Pete Montano | — | (415) 368 3905 | GC, remodel, ADU | Elmira · Solano County | — | — |
| Qc Residential Remodeling | Qc Residential Remodeling | — | (707) 474 1880 | GC, remodel, ADU | Dixon · Solano County | — | — |
| Qth Construction | Bay Van Hoang | — | (707) 805 9053 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| Quality Erectors & Construction Co INC | Ethan Bradley Law | — | (707) 746 1233 | Other roofers | Benicia · Solano County | — | — |
| Quality Installation Services | Miles Jackson Woodward | — | (707) 745 9351 | Other | Benicia · Solano County | — | — |
| Quality Kitchen Remodeling | Quality Kitchen Remodeling | tlanzarin@yahoo.com | (707) 249 0903 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| Quality Window Coverings INC | Richard Jeffery Lozano | qualitywindowhd@aol.com | (530) 888-6069 | Other | Vacaville · Solano County | — | — |
| Quanta Energy Services LLC | Christopher Joseph Ronco | — | (707) 746 8800 | Other | Benicia · Solano County | — | — |
| Quimu Contracting INC | Miguel Quiroz | — | (707) 693 0289 | Other | Dixon · Solano County | — | — |
| Quintana & Co LLC | Francisco Quintana | — | (707) 592 0922 | Other | Dixon · Solano County | — | — |
| Quintanilla Milian Construction | Niwmar Ivan Quintanilla Milian | — | (510) 322 0746 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| R & J Roofing | Juan Carlos Jimenez | — | (650) 274 3816 | Other roofers | Vacaville · Solano County | — | — |
| R & S Erection Of Vallejo INC | Kenneth John Gotelli | — | (707) 644 5537 | Other | Vallejo · Solano County | — | — |
| R 3 Builders INC | Richard Garrett| Dade Rick Garrett Dade | — | (707) 748 2255 | GC, remodel, ADU | Benicia · Solano County | — | — |
| R A M Concrete Construction INC | Ruben Arthur Meza | — | (707) 469 9896 | Other | Vacaville · Solano County | — | — |
| R A M Drilling | R A M Drilling | — | (707) 639 7709 | Other | Rio Vista · Solano County | — | — |
| R Bastiao Construction Remodel And Repairs | Robert Joseph Bastiao | — | (925) 212 2445 | GC, remodel, ADU | Benicia · Solano County | — | — |
| R C I Concrete Construction | Anthony Salvatore Ii Tarantino | — | (707) 319 3583 | Other | Fairfield · Solano County | — | — |
| R F L Construction And Remodel | Richard Francis Sr Lais | — | (707) 208 7172 | GC, remodel, ADU | Dixon · Solano County | — | — |
| R G J Construction | Ricco Jr Gigliotti | ricco@rgjconstruction.com | (916) 849 0200 | GC, remodel, ADU | Dixon · Solano County | — | — |
| R J Contract Services | Robb Joseph Rummel | sales@rjcontract.com.sg | (707) 470 6864 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| R J Flooring | R J Flooring | — | (530) 682 6963 | Other | Rio Vista · Solano County | — | — |
| R K Electric | Ronald Lewis Knarr | info@rkelectric.com | (707) 746 5536 | Electricians | Benicia · Solano County | — | — |
| R K O Construction | Rory Kauwika Oreta | — | (707) 624 0516 | GC, remodel, ADU | Vacaville · Solano County | — | — |
| R K Salmon General Contractor | R K Salmon General Contractor | — | (707) 745 5550 | GC, remodel, ADU | Benicia · Solano County | — | — |
| R L Electric | Raymond Manuel Lanzarin | — | (707) 450 5539 | Electricians | Vacaville · Solano County | — | — |
| R L Fuller INC DBA Superior Mechanica | Ricky Lee Fuller | — | (707) 207 0100 | HVAC | Fairfield · Solano County | — | — |
| R Magday Builders INC | Rudy Ganigan Magday | — | (707) 319 8106 | GC, remodel, ADU | Vallejo · Solano County | — | — |
| R R Construction | Robert Raphael Jr Schieberl | — | (707) 448 2038 | Electricians | Vacaville · Solano County | — | — |
| R V Concrete | R V Concrete | — | (707) 330 9296 | Windows, patio, painters | Fairfield · Solano County | — | — |