| 1 Up Construction INC | Roger Arlen Mills | — | (925) 503 7024 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| 1st Streamline Construction INC | Timothy James Stevenson | — | (925) 350 1346 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| 2 R Construction | Romero Ramon | — | (510) 367 6131 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| 360 Construction J N | Jorge Arturo Navarrete Avila | — | (925) 437 1099 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| 3G Builders And Renovation | Joseph Von Edward Guthrie | — | (925) 497 0833 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| 3rd Party Management Services LLC DBA Griffs Construction | Joshua John Griffin | — | (925) 966 4455 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| 500 Elite Builders LLC | Sornphet Jantharid | — | (510) 599 2102 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| 625 St Clair Development Incorporated | Timothy Hawkins | — | (510) 686 0858 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| 99 North Construction & Plumbing INC | Denis Leonid Climov | — | (415) 650 6503 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| A & A Consulting Engineers | A & A Consulting Engineers | — | (510) 260 4538 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| A & C Construction | Castaneda Arturo | — | (925) 628 6427 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| A & J Fencing | Justin Lyle Lena | — | (925) 939 2105 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| A & N Construction | Higinio Fidel Olivera | — | (209) 914 4019 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| A + Home Repair And Remodeling | Folke David | — | (925) 548 5535 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| A A C Construction | Christian Jean Rousset | — | (925) 890 4482 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| A A Custom Construction Services A California Joint Venture | & D Plumbing A | — | (925) 922 4770 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| A B Builders INC | Hector Gallegos | — | (925) 759 3095 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| A B C Building & Restoration INC | James David Sutton | — | (925) 766 8383 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| A Cut Above Builders INC | David Preston Burchard | — | (925) 817 8231 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| A Finished Home INC | Brian Patrick Kozera | brian@afinishedhome.com | (925) 915 0896 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| A J A General Construction | Angelo John Arminio | — | (510) 604 8894 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| A J C Design And Construction INC | Juan Bernardo Ortiz Lemus | — | (510) 478 6644 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| A L B INC | Robert Jr Gonzalez | — | (925) 427 1199 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| A L P Construction | Adrian Lopez Perez | — | (415) 336 9145 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| A L Venegas Construction | Anthony Louis Venegas | — | (925) 339 6615 | GC, remodel, ADU | Pacheco · Contra Costa County | — | — |
| A Meadows Construction INC | Aaron Anthony Meadows | — | (925) 625 4951 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| A P C O Construction | Kimberly Yvett Avila | — | (925) 680 7397 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| A R Glass | A R Glass | — | (415) 933 7632 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| A Ramos Construction INC | Ramos-avila Agapito | — | (925) 766 7960 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| A S D Woodworks INC | Steve Perry Glover | — | (925) 216 3622 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| A S K Construction INC | Adam Spencer Kittredge | — | (925) 848 4993 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| A S Remodeling Construction | Sanchez Chavez Alfredo | — | (510) 860 9470 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| A T Construction | Allen Ka Wai Tam | — | (510) 367 7795 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| A W S Partners INC | Grant Austin Adams | — | (925) 413 7268 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| A#1 Developers INC | Joseph John Rezek | — | (510) 378 8884 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| A&j Outdoor Solutions | Dean William Henninger | — | (510) 221 7246 | GC, remodel, ADU | Pinole · Contra Costa County | — | — |
| A&r Builder Pro | Victor Alfonso Rivera | — | (925) 518 4079 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| A-1 Pro Construction LLC | Nicklesh Avtar Johal | — | (925) 236 0776 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| A-2-z Services | Michael Nathaniel Austin | — | (925) 323 2872 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| A-plus Painting Company INC | Juan Enrique Salazar | — | (925) 325 7949 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |