| Above Construction | Vasile Horatiu Gavrila | — | (925) 690 7352 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Above The Line Construction | Keith Bernie Seiber | — | (925) 301 7701 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Above The Wave | Above The Wave | — | (925) 783 6627 | Pool | Oakley · Contra Costa County | — | — |
| Abraham K Alvarez | Abraham K Alvarez | — | (925) 339 0343 | HVAC | Danville · Contra Costa County | — | — |
| Abraham Lubaton | Abraham Lubaton | — | (510) 715 0448 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Abril Roofing INC | Richard Steven Jr Abril | davidkumar@abrilroofing.com | (925) 228 0160 | Other roofers | Martinez · Contra Costa County | — | — |
| Absolute Air | Absolute Air | — | (925) 228 8490 | HVAC | Martinez · Contra Costa County | — | — |
| Absolute Best Care | Absolute Best Care | — | (925) 685 1119 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Absolute Demolition | Nayely Rufina De Leon Benavides | — | (510) 585 1807 | Other | San Pablo · Contra Costa County | — | — |
| Absolute Electric | Ricardo Renee Henriquez | — | (925) 679 1663 | Electricians | Knightsen · Contra Costa County | — | — |
| Absolute Electrical Solutions | Oscar Armando Sermeno | sales@qbic.co.uk | (415) 691 5087 | Electricians | San Pablo · Contra Costa County | — | — |
| Absolute Plumbing INC Dba:absolute Plumbing And Drain | Hamid Rod Tehrani | — | (925) 676 1900 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Abstract Drywall | Abstract Drywall | — | (925) 548 0994 | Other | San Ramon · Contra Costa County | — | — |
| AC And Dc Electric | Douglas Richard Azevedo | — | (925) 381 0600 | Electricians | Concord · Contra Costa County | — | — |
| AC Builders & Construction INC | Christian Jean Rousset | — | (925) 960 5883 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| AC Painting Services | Adrian Rene Carranza | — | (925) 497 9135 | Windows, patio, painters | Antioch · Contra Costa County | — | — |
| Ac3 | Heidi Getman Mc Leod | — | (510) 865 2455 | Electricians | Lafayette · Contra Costa County | — | — |
| Acapulco Gold Quality Painting | Acapulco Gold Quality Painting | — | (925) 818 9260 | Windows, patio, painters | Concord · Contra Costa County | — | — |
| Accel Painting | Brian Alex Fink | admin@accelpainting.com | (650) 784 8123 | Windows, patio, painters | Hercules · Contra Costa County | — | — |
| Accent Sprinklers And Landscaping | Accent Sprinklers And Landscaping | — | (925) 323 5668 | Windows, patio, painters | Walnut Creek · Contra Costa County | — | — |
| Access Security Solutions LLC | Babajide Kofi Williams | — | (510) 356 0083 | Alarm and generators | El Sobrante · Contra Costa County | — | — |
| Accordco | Pazouki Masoud | — | (510) 910 7993 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Accurate Garage Doors And Automatic Gates | Yossi Chaim Karvani | — | (408) 644 4780 | Other | Walnut Creek · Contra Costa County | — | — |
| Accurate Home Remodeling | Miles Kenneth Sanders | — | (925) 594 0998 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Accurate Poly Coatings | John Franklin Iv Tuttle | — | (925) 427 5100 | Other | Pittsburg · Contra Costa County | — | — |
| Acdc Power | Calvin Thomas Mougeotte | — | (805) 550 4762 | Electricians | Oakley · Contra Costa County | — | — |
| Ace 1 Electric | Oscar Fernando Jr Aceituno | — | (510) 672 5496 | Electricians | Richmond · Contra Costa County | — | — |
| Ace Construction Company | Pazouki Davoud | — | (510) 368 0004 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Ace Painting Service INC DBA Ace Painting | Daniel Ralph Aceves | — | (925) 584 5285 | Windows, patio, painters | Brentwood · Contra Costa County | — | — |
| Ace Pool Service INC | Richard C Pruett | — | (925) 689 5291 | Pool | Concord · Contra Costa County | — | — |
| Ace Systems INC | Jon Andrew Meurer | sales@acesystems.com | (510) 684 3973 | Electricians | El Cerrito · Contra Costa County | — | — |
| Ace's Plumbing | Ace's Plumbing | — | (925) 260 6695 | Other | Bay Point · Contra Costa County | — | — |
| Ace-high Engineering | Jose Manuel Ortega | — | (510) 715 0585 | Other | Brentwood · Contra Costa County | — | — |
| Acestar Plumbing | Acestar Plumbing | — | (510) 837 8999 | Other | El Sobrante · Contra Costa County | — | — |
| Acetop Electric INC | Michael Ernest Behrens | info@3medesign.com | (510) 409 9285 | Electricians | Richmond · Contra Costa County | — | — |
| Achelis Construction Company | Scott N Achelis | — | (925) 935 7920 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Aci INC | Jason Michael Cerecedes | — | (925) 765 0901 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Acker Roofing INC | William Dean Mouser | info@ackerroofing.com | (925) 891 3331 | Other roofers | Concord · Contra Costa County | — | — |
| Acme Acoustic | Acme Acoustic | — | (530) 929 7254 | Other | Concord · Contra Costa County | — | — |
| Acme Integrated Services DBA Integrated Construction Services | Nayelli Ramirez | — | (925) 329 5609 | Other | Walnut Creek · Contra Costa County | — | — |