| Gemini Pool & Spa Inc. | Gemini Pool & Spa Inc. | — | (808) 488-7419 | Pool | Waipahu · Honolulu County | — | — |
| General Contracting Services LLC | General Contracting Services LLC | gus@generalcontractingservices.com | (954) 512-4732 | GC, remodel, ADU | Wahiawa · Honolulu County | — | — |
| General Contractors Association Of Hawaii | General Contractors Association Of Hawaii | — | (808) 833-1681 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| General Contractors Oahu | General Contractors Oahu | — | (808) 707-8817 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Geotek Hawaii INC | Geotek Hawaii INC | info@geotekhawaii.com | — | Other | Waipahu · Honolulu County | — | — |
| Glad's Landscaping & Tree Trimming DBA The Tree People | Glad's Landscaping & Tree Trimming DBA The Tree People | — | (808) 836-9515 | Tree | Honolulu · Honolulu County | — | — |
| Glass Products Hawaii Inc. | Glass Products Hawaii Inc. | — | (808) 242-7277 | Windows, patio, painters | Wailuku · Maui County | — | — |
| Glass Visions Hawaii | Glass Visions Hawaii | micah@micahrich.com | (808) 269-5601 | Windows, patio, painters | Wailuku · Maui County | — | — |
| Glass Visions Hawaii LLC | Glass Visions Hawaii LLC | micah@micahrich.com | — | Windows, patio, painters | Wailuku · Maui County | — | — |
| Glassey Steel Works INC | Glassey Steel Works INC | admin@glasseysteelworks.com | (801) 878-7624 | Other | Honolulu · Honolulu County | — | — |
| Glidewell Plumbing LLC | Glidewell Plumbing LLC | office@gp-hi.com | — | Other | Honolulu · Honolulu County | — | — |
| Gm Construction INC | Gm Construction INC | — | (808) 325-6505 | GC, remodel, ADU | Kailua-Kona · Hawaii County | — | — |
| Goev Charging Station | Goev Charging Station | — | (808) 543-4638 | EV chargers | Honolulu · Honolulu County | — | — |
| Gold Pacific Roofing | Gold Pacific Roofing | — | (808) 744-1476 | Other roofers | Honolulu · Honolulu County | — | — |
| Gomes Pool Service LLC | Gomes Pool Service LLC | — | (808) 870-6469 | Pool | Kahului · Maui County | — | — |
| Goodfellow Construction INC | Goodfellow Construction INC | projects@goodfellowconstruction.com | (301) 928-8863 | GC, remodel, ADU | Kihei · Maui County | — | — |
| Grace Electric LLC | Grace Electric LLC | info@grace-electric.com | (346) 261-4768 | Electricians | Mililani · Honolulu County | — | — |
| Grace Pacific LLC | Grace Pacific LLC | materialorder@gracepacific.com | (808) 833-2502 | GC, remodel, ADU | Kapolei · Honolulu County | — | — |
| Graham Builders INC | Graham Builders INC | clientcare@grahambuilders.com | (808) 593-2808 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Grand Hawaii Electric LLC | Grand Hawaii Electric LLC | %20johny@grandhawaiielectric.com | (808) 366-3839 | Electricians | Honolulu · Honolulu County | — | — |
| Grand Welcome Hawaii (oahu & Big Island) - Vacation & Short-Term Rental Management | Grand Welcome Hawaii (oahu & Big Island) - Vacation & Short-Term Rental Management | customercare@grandwelcome.com | (888) 919-4987 | Property managers | Kailua-Kona · Hawaii County | — | — |
| Granite Construction Company | Granite Construction Company | — | (831) 724-1011 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Gravitec Systems INC | Gravitec Systems INC | sales@gravitec.com | — | Other | Other County | — | — |
| Greg Putman Construction INC | Greg Putman Construction INC | — | (808) 938-3675 | GC, remodel, ADU | Kailua Kona · Hawaii County | — | — |
| Greg's Roofing | Greg's Roofing | — | (808) 822-3398 | Other roofers | Kapaʻa · Kauai County | — | — |
| Ground Shakers Construction LLC | Ground Shakers Construction LLC | kealiinoem@gmail.com | — | Other | Waianae · Honolulu County | — | — |
| Group Builders INC | Group Builders INC | — | (808) 832-0888 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| H T M Contractors INC | H T M Contractors INC | a.tongotea@htmcontractors.com | (808) 456-3311 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| H W Remodeling INC | H W Remodeling INC | joseolvera@hwremodeling.com | (281) 850-9753 | Electricians | Honolulu · Honolulu County | — | — |
| Hale Kai Electric | Hale Kai Electric | — | (808) 364-4187 | Electricians | Hauula · Kalawao County | — | — |
| Hale Kai Electric LLC | Hale Kai Electric LLC | — | (808) 364-4187 | Electricians | Other County | — | — |
| Hamco Glass & Glazing LLC | Hamco Glass & Glazing LLC | — | (808) 245-8793 | Windows, patio, painters | Lihue · Kauai County | — | — |
| Hanale Builders LLC | Hanale Builders LLC | christopher@hanalebuilders.com | (808) 960-0143 | GC, remodel, ADU | Hilo · Hawaii County | — | — |
| Hanalei Electric LLC | Hanalei Electric LLC | brandon@hanaleielectric.com | — | Electricians | Kilauea · Kauai County | — | — |
| Hanalei House Painters | Hanalei House Painters | — | (949) 687-5496 | Windows, patio, painters | Kilauea · Kauai County | — | — |
| Hapa Landscaping LLC | Hapa Landscaping LLC | hapalandscaping@gmail.com | (808) 732-4272 | Windows, patio, painters | Honolulu · Honolulu County | — | — |
| Happy Nest LLC | Happy Nest LLC | hello@happynest.com | (855) 335-9274 | GC, remodel, ADU | Kilauea · Kauai County | — | — |
| Happydoors Property Management | Happydoors Property Management | — | (808) 800-4152 | Property managers | Honolulu · Honolulu County | — | — |
| Harner Wall Systems LLC | Harner Wall Systems LLC | julie@harnerwall.com | — | GC, remodel, ADU | Kailua Kona · Hawaii County | — | — |
| Harry Perreira Roofing | Harry Perreira Roofing | — | (808) 572-0837 | Other roofers | Makawao · Maui County | — | — |