| Hutchens Construction | Douglas Stuart Hutchens | — | (925) 250 4214 | GC, remodel, ADU | Martinez · Contra Costa County | — | — |
| Hutton Construction & Daughters Corporation | Angelita Maria Hutton | — | (510) 518 7002 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Huynh Landscaping | Huynh Landscaping | — | (707) 342 7356 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| Hv Electric | Vinh Chi Nguyen | administracion@hv-electric.com | (925) 408 5714 | Electricians | Martinez · Contra Costa County | — | — |
| HVAC Energy Solutions | Daniel Robert Fink | — | (925) 778 1335 | HVAC | Danville · Contra Costa County | — | — |
| HVAC For Les$ Incorporated | Les Daniel Finster | — | (510) 219 1021 | HVAC | Concord · Contra Costa County | — | — |
| HVAC Pro Service INC | Iurii Bondarchuk | — | (408) 590 5468 | HVAC | Pleasant Hill · Contra Costa County | — | — |
| HVAC Replacement Services | Michael William Childers | — | (925) 481 0525 | HVAC | Antioch · Contra Costa County | — | — |
| Hydro Kingz INC | Miguel Adrian Rodriguez Lucas | — | (925) 848 7651 | Other | Antioch · Contra Costa County | — | — |
| Hydrotech Radiant And Boilers | Denis Ernesto Roman Cordero | — | (415) 238 8236 | HVAC | Hercules · Contra Costa County | — | — |
| Hyung Kim | Hyung Kim | — | (510) 774 0357 | GC, remodel, ADU | Orinda · Contra Costa County | — | — |
| Hz Home Improvement INC | Zilkic Hajriz | — | (925) 963 1309 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| I & J Construction INC | Gutierrez Isidro Campos | — | (925) 642 3064 | GC, remodel, ADU | Pittsburg · Contra Costa County | — | — |
| I C Masonry Services INC | Fernandez Israel Castaneda | — | (415) 640 2515 | Other | Richmond · Contra Costa County | — | — |
| I C R Electrical Contractors | Garcia Daniel | — | (925) 757 8282 | Electricians | Antioch · Contra Costa County | — | — |
| I Paint Bay Area INC | Jesus Alexis Gonzalez | — | (925) 597 0750 | Windows, patio, painters | Pittsburg · Contra Costa County | — | — |
| I.p Construction INC | Pena Magallanes Ignacio | — | (925) 876 7849 | GC, remodel, ADU | Bay Point · Contra Costa County | — | — |
| Ian Mill Home Improvements | Ian Mill Home Improvements | — | (510) 681 3330 | GC, remodel, ADU | Richmond · Contra Costa County | — | — |
| Ian Samuel Stonerock | Ian Samuel Stonerock | — | (925) 332 7281 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Iberian Builders INC | Andrew James Andrade | — | (510) 449 5335 | GC, remodel, ADU | Walnut Creek · Contra Costa County | — | — |
| Ibo Tejada | Ibo Tejada | — | (510) 384 5008 | GC, remodel, ADU | El Cerrito · Contra Costa County | — | — |
| Ibuild Construction & Renovations INC | Olavi Hamid | — | (925) 890 0906 | GC, remodel, ADU | Clayton · Contra Costa County | — | — |
| Ibzan Construction INC | Hilel Itai Vargas Cortez | — | (603) 268 5687 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |
| Icay INC | Eric Francis Icay | — | (925) 962 3867 | Other | Lafayette · Contra Costa County | — | — |
| Icon Design Build Corporation | Hashem Nejad Kambiz | — | (510) 209 7979 | GC, remodel, ADU | Pleasant Hill · Contra Costa County | — | — |
| Id Construction | Ibrahim Dzhudzho | — | (925) 444 5672 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Ideal Construction | Ivaylo Marinov Kirov | — | (925) 383 5430 | GC, remodel, ADU | Concord · Contra Costa County | — | — |
| Igt General Contractor INC | Iniguez Ruben Ruiz | — | (925) 303 3516 | GC, remodel, ADU | Oakley · Contra Costa County | — | — |
| Ihomeshutters INC | Chien Wee Ang | — | (510) 358 8000 | Other | San Ramon · Contra Costa County | — | — |
| Il INC | Neli Atanasova Maneva | — | (510) 499 1155 | GC, remodel, ADU | San Pablo · Contra Costa County | — | — |
| Illice Concrete INC | Pablo Jorge Navarro | illice.concrete.inc@gmail.com | (925) 584 9915 | Other | Concord · Contra Costa County | — | — |
| Illuminate Electric Sf INC | Samuel Matthew Sottile | — | (510) 631 1724 | Electricians | El Sobrante · Contra Costa County | — | — |
| Illuminate Solar Company | Mark Frank Hafen | info@illuminatesolar.com | (925) 324 7176 | Other roofers | Walnut Creek · Contra Costa County | — | — |
| Image Construction Incorporated | Elahe Soleimani Noori | — | (925) 658 2131 | GC, remodel, ADU | San Ramon · Contra Costa County | — | — |
| Imagine Construction | Brett Alan Weaver | — | (925) 621 0665 | GC, remodel, ADU | Danville · Contra Costa County | — | — |
| Impact Services Enterprises DBA Impact Demolition & Pavers | Lamartine Antonio Martins | — | (510) 525 6665 | Other | Richmond · Contra Costa County | — | — |
| Impax Construction & Remodeling INC | Ismael Ardu Gutierrez Gonzalez | — | (415) 866 6092 | GC, remodel, ADU | Brentwood · Contra Costa County | — | — |
| Imperia Roofing And Exteriors | Gregory Leonard Gainous | — | (551) 600 3822 | Other roofers | Walnut Creek · Contra Costa County | — | — |
| Imperial Carpentry | Imperial Carpentry | — | (503) 875 9717 | Other | Walnut Creek · Contra Costa County | — | — |
| Imperial Custom Kitchen | Imperial Custom Kitchen | — | (925) 779 9786 | GC, remodel, ADU | Antioch · Contra Costa County | — | — |