| Outdoor Electric LLC | William Anthony Jr Gonsalves | blainepertler@yahoo.com | (510) 552 6564 | Electricians | Brentwood · Contra Costa County | — | — |
| Outline General Contractors INC | Luis Damian Perez Morales | — | (510) 253 0420 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Ovico INC | Manea Ovidiu | — | (415) 724 3419 | Electricians | Alamo · Contra Costa County | — | — |
| Owl And The Bear Painting Pro The | Andrzejczak Robert | — | (925) 698 6674 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Ozment Build To Suit Const | Ozment Build To Suit Const | — | (925) 497 2201 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| P & G Restoration Services INC | Gregory Harold Overfield | — | (925) 820 0650 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| P & J Tree Service INC | Morales Pulido Jose | — | (925) 250 1603 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| P C & N Construction INC | Christi Lynn Plum | — | (925) 634 4567 | Other | Byron · Contra Costa County | — | — |
| P C H Floors | P C H Floors | — | (415) 810 4872 | Other | Richmond · Contra Costa County | — | — |
| P E C | P E C | — | (925) 785 3870 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| P G Emminger INC | William Kiefer Clark | — | (925) 313 5830 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| P H Electrical Services | Paul Stuart Healy | — | (707) 484 4411 | Electricians | Discovery Bay · Contra Costa County | — | — |
| P J Mc Namara INC | Patrick Joseph Mc Namara | pjmcnamara.inc@gmail.com | (925) 228 9558 | Windows, patio, painters | Martinez · Contra Costa County | — | — |
| P K N Development | P K N Development | premierdesignhomes@gmail.com | (925) 837 2828 | GC, remodel, ADU | Diablo · Contra Costa County | — | — |
| P L Construction | Zong Yi Li | — | (925) 300 8778 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| P M G | P M G | — | (925) 812 2887 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| P S Construction | Penelope Elizabeth Smith | — | (925) 575 0314 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| P T Cooling & Heating | P T Cooling & Heating | — | (510) 367 1878 | HVAC | San Pablo · Contra Costa County | — | — |
| P V Construction INC | Pedro Maximiliano Vazquez Medel | — | (510) 776 9256 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| P W Construction | Paul Bryan Wilson | — | (925) 813 0961 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| P&f Drywall INC | Pablo Chavez | — | (415) 622 7193 | Other | Richmond · Contra Costa County | — | — |
| P&g General Construction INC | Garry Eugene Burns | — | (415) 689 0800 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Pablo Restorations Roofing And Water Proof INC | Leobel Sr Pablo Pablo | — | (510) 866 9288 | Other roofers | Richmond · Contra Costa County | — | — |
| Pabst Tile INC | Michael John Jr Pabst | — | (925) 628 8931 | Other | Oakley · Contra Costa County | — | — |
| Pac Integrations INC | Arlene Joy Custock | billing@pacintegrations.com | (925) 687 7233 | Electricians | Concord · Contra Costa County | — | — |
| Pacfic State Paving | Kimberly Yvett Avila | — | (925) 350 1329 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Pacheaco Electric | Jake Thomas Pacheaco | — | (510) 378 1515 | Electricians | Brentwood · Contra Costa County | — | — |
| Pacheco & Son's Landscaping INC | Roberto Carlos Pacheco Guerra | — | (925) 234 5948 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Pacheco Custom Tile | Pacheco Custom Tile | pachecocustomtile@gmail.com | (925) 744 9137 | Other | Martinez · Contra Costa County | — | — |
| Pacheco Landscape And Pool Construction | Cristobal Manuel Jr Pacheco | — | (925) 276 2106 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Pacific - Mountain Contractors Of California INC | Albert Dominic Iii Seeno | — | (925) 682 6419 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Pacific Automatic Gate Services INC | Liberato Acevedo Jesus | — | (510) 712 6107 | Other | San Pablo · Contra Costa County | — | — |
| Pacific Bay Construction | Omar Jorge Gonzalez Moreno | — | (925) 698 8552 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Pacific Blue Construction LLC | David Strykowski | — | (925) 546 8873 | GC, remodel, ADU | Alamo · Contra Costa County | — | — |
| Pacific Blue Landscape | Pacific Blue Landscape | marco@pacificbluelc.com | (925) 864 3240 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Pacific Coast Carpet INC | John Patrick Hopfner | — | (925) 609 2150 | Other | Concord · Contra Costa County | — | — |
| Pacific Coast General Engineering INC | Henry Sam Iii Baugh | — | (925) 252 0214 | Other | Pittsburg · Contra Costa County | — | — |
| Pacific Coast Landscape Management INC | Alvaro Mora Beltran | — | (925) 513 2310 | Windows, patio, painters | Byron · Contra Costa County | — | — |
| Pacific Coast Reconstruction & Building INC | Matthew Gerrard Heavey | — | (925) 676 7447 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Pacific Coast Roofing Service | Michael Ray Trimmer | — | (510) 912 5454 | Other roofers | Martinez · Contra Costa County | — | — |