| Idex Global Services INC | Craig Daron Morris | — | (415) 249 3400 | Electricians | San Francisco · San Francisco County | — | — |
| Idrill Engineering INC | Cathal Sean O'curraoin | idrilleng@gmail.com | (415) 910 7548 | Other | San Francisco · San Francisco County | — | — |
| Igor Dugenny | Igor Dugenny | — | (415) 518 9421 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Igor Kurikov | Igor Kurikov | — | (415) 720 1643 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Igor V Ostapenko | Igor V Ostapenko | — | (415) 828 4649 | Electricians | San Francisco · San Francisco County | — | — |
| Ike's INC DBA Ike's Electric INC | Garcia Isaias | — | (415) 861 6417 | Electricians | San Francisco · San Francisco County | — | — |
| Ilh Construction Company | Ivar Leif Hoftvedt | — | (415) 652 2753 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Imperia Roofing | Imperia Roofing | info@imperiaroofing.us | (650) 200-6968 | Other roofers | San Francisco · San Francisco County | — | — |
| Indigo Painting | Indigo Painting | indigopaintingcompany1@gmail.com | (510) 927 5857 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Infinity Plumbing & Rooter INC | Juan Antonio Perez Andres | — | (415) 730 3182 | Other | San Francisco · San Francisco County | — | — |
| Inlaid Floor Co | Mark Lawrence Walorny | — | (415) 730 7737 | Other | San Francisco · San Francisco County | — | — |
| Inncon Design Electric | Peter Chi Chiu Chow | — | (415) 699 4379 | Electricians | San Francisco · San Francisco County | — | — |
| Inncon Design Plumbing | Inncon Design Plumbing | — | (415) 699 4379 | Other | San Francisco · San Francisco County | — | — |
| Innovation Plumbing And Rooter | Innovation Plumbing And Rooter | — | (415) 424 8419 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Innovative Construction Implement & Design Co | Leung To Chow | — | (415) 699 4379 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Innovator Electric INC | Luis Netzahualcoy Zavala | — | (415) 913 7073 | Electricians | San Francisco · San Francisco County | — | — |
| Input Output Network INC | Russell Laurence Brace | — | (650) 785 2466 | Electricians | San Francisco · San Francisco County | — | — |
| Inside Out Painting & Construction | Antunez Navarrete Abraham | — | (415) 410 6731 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Inspection.re | Inspection.re | info@inspectionre.com | (888) 884-6779 | Inspectors | San Francisco · San Francisco County | — | — |
| Instaguard Security Services-San Francisco-Bay Area | Instaguard Security Services-San Francisco-Bay Area | info@instaguardinc.com | (800) 786-0698 | Alarm and generators | San Francisco · San Francisco County | — | — |
| Integrated Wall Systems INC | Jacques Florent Leon Houben | interested@domainmarket.com | (415) 418 4846 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Integrity First Plumbing INC | Claytis Lejon Norman | — | (415) 724 1100 | Other | San Francisco · San Francisco County | — | — |
| Interior Design Solutions | Rokay Jalal Mukhtar | — | (510) 359 8349 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| International Commercial Awnings INC | Nam Quoc Trinh | — | (415) 647 7406 | Electricians | San Francisco · San Francisco County | — | — |
| International Fire INC | Alan Joseph Macias | — | (415) 643 1767 | Electricians | San Francisco · San Francisco County | — | — |
| International Waterproofing & Roofing | Jack Murray Scott | — | (415) 575 0912 | Other roofers | San Francisco · San Francisco County | — | — |
| Interval Solutions | Interval Solutions | — | (415) 279 3261 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Ipowersf Electric INC | Matias German | — | (415) 559 2965 | Electricians | San Francisco · San Francisco County | — | — |
| Iq Remodeling Maintenance Service | Martinez Arturo Marin | — | (415) 710 7182 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Irish Painting | Irish Painting | — | (415) 368 8589 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| Iron Maverick INC | Ronald Carson Lester | — | (415) 577 8085 | Other | San Francisco · San Francisco County | — | — |
| Itu Construction INC | Rony Jesus| Perez Rony J Perez Velasquez | — | (650) 207 4849 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Itz Networks | Itz Networks | 1@itznetworks.com | (415) 446-8877 | Alarm and generators | San Francisco · San Francisco County | — | — |
| Ivanna Savciuc | Ivanna Savciuc | — | (415) 734 8167 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| Iy Development & Renovation INC | Scott Sam Fisher | — | (833) 288 8008 | HVAC | San Francisco · San Francisco County | — | — |
| J & A Modern Construction | Albert Wai Wing Cheng | — | (415) 867 1486 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| J & C Glass Works | Constance Elizabeth Halog | — | (415) 751 5525 | Windows, patio, painters | San Francisco · San Francisco County | — | — |
| J & J Professional Plumbing INC | Wayne Wing Cheung Wong | — | (415) 939 8822 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |
| J & K Pro Plumbing INC | Xia Yi Jack Liu | — | (415) 272 7288 | Other | San Francisco · San Francisco County | — | — |
| J & L Construction Company | James Pui Cheng | — | (415) 509 6868 | GC, remodel, ADU | San Francisco · San Francisco County | — | — |