| Island Budget Painting Resources INC | Island Budget Painting Resources INC | islandbudgetpainting@gmail.com | (808) 255-8612 | Windows, patio, painters | Honolulu · Honolulu County | — | — |
| Island Coating LLC | Island Coating LLC | — | (808) 520-5626 | Windows, patio, painters | Honolulu · Honolulu County | — | — |
| Island Comfort | Island Comfort | — | (808) 215-9087 | HVAC | Lihue · Kauai County | — | — |
| Island Comfort | Island Comfort | — | (808) 215-9091 | HVAC | Aiea · Honolulu County | — | — |
| Island Contractors | Island Contractors | admin@islandcontractors.pro | (808) 900-7540 | GC, remodel, ADU | Kapolei · Hawaii County | — | — |
| Island Controls INC | Island Controls INC | ken@islandcontrols.com | — | HVAC | Honolulu · Honolulu County | — | — |
| Island Custom Tile INC | Island Custom Tile INC | kauaitilework@gmail.com | (808) 343-2613 | Other | Kekaha · Kauai County | — | — |
| Island Electrical Contracting | Island Electrical Contracting | — | (808) 388-1144 | Electricians | Waianae · Hawaii County | — | — |
| Island Fire And Water Restoration | Island Fire And Water Restoration | — | (808) 250-2813 | Restoration | Kihei · Maui County | — | — |
| Island Glass Hawaii | Island Glass Hawaii | — | (808) 822-5224 | Windows, patio, painters | Lihue · Kauai County | — | — |
| Island Hale Property Management LLC | Island Hale Property Management LLC | — | (808) 389-6323 | Property managers | Kailua · Kalawao County | — | — |
| Island Home Builders Inc. | Island Home Builders Inc. | — | (808) 283-3467 | GC, remodel, ADU | Captain Cook · Hawaii County | — | — |
| Island Independence LLC | Island Independence LLC | islandindependence@gmail.com | (808) 250-2527 | Other roofers | Kihei · Maui County | — | — |
| Island Mechanical Corporation | Island Mechanical Corporation | — | (808) 682-5363 | GC, remodel, ADU | Kapolei · Honolulu County | — | — |
| Island Metals | Island Metals | — | (808) 246-6600 | Other roofers | Lihue · Kauai County | — | — |
| Island Ohana Tree & Landscaping Services | Island Ohana Tree & Landscaping Services | — | (808) 465-4602 | Tree | Honolulu · Honolulu County | — | — |
| Island Pool & Spa Supply | Island Pool & Spa Supply | — | (808) 593-8448 | Pool | Honolulu · Honolulu County | — | — |
| Island Pool & Spa Supply | Island Pool & Spa Supply | — | (808) 977-3199 | Pool | Lihue · Kauai County | — | — |
| Island Pool & Spa Supply | Island Pool & Spa Supply | — | (808) 326-1151 | Pool | Kailua-Kona · Hawaii County | — | — |
| Island Pool Builders | Island Pool Builders | — | (808) 989-2657 | Pool | Honolulu · Honolulu County | — | — |
| Island Rentals & Real Estate | Island Rentals & Real Estate | — | (808) 822-1049 | Property managers | Lihue · Kauai County | — | — |
| Island Resort Property | Island Resort Property | — | (808) 329-7170 | Property managers | Kailua-Kona · Hawaii County | — | — |
| Island Roots Tree Trimming Kauai | Island Roots Tree Trimming Kauai | — | (808) 855-5593 | Tree | Kilauea · Kauai County | — | — |
| Island Security | Island Security | — | (206) 232-0843 | Alarm and generators | Kahului · Maui County | — | — |
| Island Security Fence | Island Security Fence | — | (808) 893-0822 | Alarm and generators | Kahului · Maui County | — | — |
| Island Tile & Stone LLC | Island Tile & Stone LLC | info@islandtilestone.com | (808) 727-2555 | Other | Puunene · Maui County | — | — |
| Island Tinting LLC | Island Tinting LLC | interested@domainmarket.com | (888) 694-6735 | Windows, patio, painters | Hilo · Hawaii County | — | — |
| Island Tree Style | Island Tree Style | info@islandtreestyle.com | (808) 740-0488 | Tree | Hana · Maui County | — | — |
| Island Trees Corp | Island Trees Corp | — | (808) 384-9575 | Tree | Kailua · Kalawao County | — | — |
| Island Wide Concrete Pumping LLC | Island Wide Concrete Pumping LLC | islandwideconcretepumping@gmail.com | — | Other | Mountain View · Hawaii County | — | — |
| Island Windows & Doors | Island Windows & Doors | — | (808) 657-3790 | Windows, patio, painters | Honolulu · Honolulu County | — | — |
| Islandwide Fencing INC | Islandwide Fencing INC | info@islandwidefencing.com | (808) 935-0800 | Windows, patio, painters | Hilo · Hawaii County | — | — |
| Isle Communities LLC | Isle Communities LLC | jeff@islecommunities.com | (808) 650-5682 | GC, remodel, ADU | Kaneohe · Honolulu County | — | — |
| It Kauai | It Kauai | — | (808) 246-4446 | Alarm and generators | Lihue · Kauai County | — | — |
| It's Electric Hawaii | It's Electric Hawaii | jcorreia808@gmail.com | (808) 521-7117 | Electricians | Honolulu · Honolulu County | — | — |
| Iwamoto Electric LLC | Iwamoto Electric LLC | ross@iwamotoelectric.com | (808) 987-2233 | Electricians | Hilo · Hawaii County | — | — |
| J & G Flooring LLC | J & G Flooring LLC | jonathan@jgflooring.com | (214) 597-7730 | Other | Honolulu · Honolulu County | — | — |
| J Cesario Builders LLC | J Cesario Builders LLC | jcesariobuilders@charter.net | (231) 838-8774 | GC, remodel, ADU | Kalaheo · Kauai County | — | — |
| J Construction LLC | J Construction LLC | — | (808) 781-1068 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| J Construction LLC | J Construction LLC | — | (949) 679-5800 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |