| Integrity Plus Plumbing Ie INC | Anthony Dwayne Grant | — | (951) 541 6400 | Other | Wildomar · Riverside County | — | — |
| Integrity Pool Care | Ryan William Patrick Osborne | — | (951) 444 7150 | Pool | Wildomar · Riverside County | — | — |
| Integrity Pump INC | Randy James Sr Whaley | — | (951) 675 1918 | Other | Hemet · Riverside County | — | — |
| Integrity Rebar Placers | Kenneth Robert Negrete | — | (951) 696 6843 | Other | Perris · Riverside County | — | — |
| Integrity Restoration And Reconstruction INC | Chris Elgin Muller | — | (951) 256 1110 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Integrity Restoration Pros INC | Jonathan William Bloom | eben@eyebytes.com | (951) 490 7253 | GC, remodel, ADU | Murrieta · Riverside County | — | — |
| Intelinet Incorporated | Edward Fusco | — | (951) 304 0656 | Other | Murrieta · Riverside County | — | — |
| Intelligent Technology Solutions | Intelligent Technology Solutions | — | (760) 360 8860 | Other | Palm Desert · Riverside County | — | — |
| Intellitalk INC | Val Michael Sorrentino | — | (951) 987 9877 | Other | Corona · Riverside County | — | — |
| Interaccess Systems | Peter William Bongard | — | (760) 345 0478 | Electricians | Bermuda Dunes · Riverside County | — | — |
| Intercom Clock & Signal Service | Laurence Abbasi | — | (951) 683 3637 | Electricians | Riverside · Riverside County | — | — |
| Interior Professional Heating And Air | Interior Professional Heating And Air | — | (951) 383 5596 | HVAC | Murrieta · Riverside County | — | — |
| Interior Tile Designs INC | Rendon Anibal Urbano | — | (951) 475 7025 | Other | Corona · Riverside County | — | — |
| Interior Transformations | Interior Transformations | — | (951) 973 2067 | Windows, patio, painters | Wildomar · Riverside County | — | — |
| Interiorgenics INC DBA Ace Handyman Services Corona Norco | William Joseph Cavanaugh | — | (951) 737 8000 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Interstate Air Quality INC | Richard Horton Friend | — | (951) 776 1590 | HVAC | Riverside · Riverside County | — | — |
| Interstate Builders INC | German Contreras | impallari@gmail.com | (559) 480 8039 | GC, remodel, ADU | Riverside · Riverside County | — | — |
| Interstate Electric | Carl Eric Dawson | — | (951) 830 7539 | Electricians | Riverside · Riverside County | — | — |
| Interstate Electric Co | Carl Eric Dawson | — | (951) 830 7539 | Electricians | Riverside · Riverside County | — | — |
| Interstate Plumbing | Interstate Plumbing | — | (760) 777 2803 | Other | Cathedral City · Riverside County | — | — |
| Interstate Steel Structures INC | Eric Alexander Aguilar | — | (951) 654 2005 | Other | San Jacinto · Riverside County | — | — |
| Interstate Stucco Systems | Interstate Stucco Systems | — | (951) 579 8659 | Other | Wildomar · Riverside County | — | — |
| Intex Interior Design INC | Juan Manuel Ibarra Maciel | — | (951) 640 2475 | GC, remodel, ADU | Perris · Riverside County | — | — |
| Intrepid Signature Landscape INC | Gabriel Meza | — | (909) 772 7822 | Windows, patio, painters | Riverside · Riverside County | — | — |
| Invision Construction | Ludwig Danniel Chlup | — | (951) 357 9592 | GC, remodel, ADU | Homeland · Riverside County | — | — |
| Iocc Construction | Karim Maher Helmy | — | (714) 488 8522 | GC, remodel, ADU | Corona · Riverside County | — | — |
| Ips Grinding And Grooving | Thomas Jacob Reickard | — | (231) 580 9401 | Other | Corona · Riverside County | — | — |
| Iq Plumbing | Aleksandar Nenchev Nenchev | — | (760) 699 4796 | Other | Indio · Riverside County | — | — |
| Irc Backflow | Irc Backflow | — | (760) 404 9771 | Other | Banning · Riverside County | — | — |
| Irie's Roofing And Waterproofing Co | Kasinger Irie | — | (951) 660 9348 | Other roofers | Perris · Riverside County | — | — |
| Irina Malik | Irina Malik | — | (310) 694 6981 | GC, remodel, ADU | La Quinta · Riverside County | — | — |
| Iroc Construction | Moe Yasser Popal | — | (909) 714 0252 | GC, remodel, ADU | Canyon Lake · Riverside County | — | — |
| Iron Hands Co | Jeremy James Malone | — | (951) 575 0100 | GC, remodel, ADU | Cherry Valley · Riverside County | — | — |
| Iron Hands Construction | Michael Eugene Herman | — | (619) 742 0494 | GC, remodel, ADU | Hemet · Riverside County | — | — |
| Iron Path Corp | Andrew Shasikant Patel | — | (951) 777 4003 | Electricians | Corona · Riverside County | — | — |
| Iron Peak Roofing | Brenton James Schultz | — | (951) 240 9127 | Other roofers | Winchester · Riverside County | — | — |
| Iron Tree Trimming And Removal INC | Ramon Alfredo Hernandez Jarquin | — | (760) 534 5308 | Windows, patio, painters | Desert Hot Springs · Riverside County | — | — |
| Ironclad Builder | Ironclad Builder | — | (951) 286 7441 | GC, remodel, ADU | Wildomar · Riverside County | — | — |
| Ironclad General Engineering INC | Kenneth Edward Cordeiro | — | (951) 742 5162 | Other | Riverside · Riverside County | — | — |
| Ironflow Plumbing | Ironflow Plumbing | — | (760) 653 9706 | Other | Murrieta · Riverside County | — | — |