| Neal Fineman Property Management | Neal Fineman Property Management | — | (808) 353-4732 | Property managers | Honolulu · Honolulu County | — | — |
| Neighborhood Power Corporation | Neighborhood Power Corporation | — | (866) 871-5423 | Electricians | Kahului · Maui County | — | — |
| Nelson Build & Repair LLC | Nelson Build & Repair LLC | — | (808) 397-3013 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Neng Win Builder Ltd | Neng Win Builder Ltd | — | (808) 382-7538 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Nexera Development LLC | Nexera Development LLC | office@nexeradevelopment.com | (808) 419-6996 | GC, remodel, ADU | Kihei · Maui County | — | — |
| Nexgen Termite & Pest Control Inc. | Nexgen Termite & Pest Control Inc. | — | (808) 236-7378 | Pest, tile roofs | Kailua · Kalawao County | — | — |
| Nicholson LLC | Nicholson LLC | winton@nicholsonhawaii.com | (808) 331-1511 | GC, remodel, ADU | Kailua Kona · Hawaii County | — | — |
| Nilo Landscape Co | Nilo Landscape Co | — | (808) 848-5124 | Tree | Honolulu · Honolulu County | — | — |
| No Ka Oi Electric LLC | No Ka Oi Electric LLC | loleelectric@gmail.com | (808) 264-3274 | Electricians | Kihei · Maui County | — | — |
| No Ka Oi Guard Services LLC | No Ka Oi Guard Services LLC | — | (808) 244-2215 | Alarm and generators | Wailuku · Maui County | — | — |
| No Ka Oi Landscape Services | No Ka Oi Landscape Services | — | (808) 335-5887 | Pest, tile roofs | Lihue · Kauai County | — | — |
| No Ka Oi Pool & Concrete | No Ka Oi Pool & Concrete | — | (808) 828-6388 | Pool | Kilauea · Kauai County | — | — |
| No Problem Electric INC | No Problem Electric INC | noproblemmaintenance@gmail.com | — | Electricians | Paia · Maui County | — | — |
| No Surprise Home Inspections | No Surprise Home Inspections | — | (808) 990-1125 | Inspectors | Kailua-Kona · Hawaii County | — | — |
| No Sweat Air Conditioning INC | No Sweat Air Conditioning INC | — | (808) 960-7323 | HVAC | Kailua-Kona · Hawaii County | — | — |
| Noahs Painting LLC | Noahs Painting LLC | — | (508) 367-9535 | Windows, patio, painters | Aiea · Honolulu County | — | — |
| Nohonani Landscape LLC | Nohonani Landscape LLC | nohonanilandscape@live.com | (808) 635-4387 | Windows, patio, painters | Honolulu · Honolulu County | — | — |
| Noresco LLC | Noresco LLC | — | (508) 614-1000 | HVAC | Honolulu · Honolulu County | — | — |
| Normans Overhead Doors INC | Normans Overhead Doors INC | — | (808) 634-6411 | Alarm and generators | Kapaʻa · Kauai County | — | — |
| Northshore Design LLC | Northshore Design LLC | info@northshore-design.com | (808) 280-1004 | GC, remodel, ADU | Haiku · Maui County | — | — |
| Northwest Electric INC | Northwest Electric INC | — | (808) 667-5054 | Electricians | Lahaina · Maui County | — | — |
| Northwest Exteriors INC | Northwest Exteriors INC | info@trustnorthwest.com | (916) 588-9017 | GC, remodel, ADU | Kapolei · Honolulu County | — | — |
| O'ahu Home Inspections | O'ahu Home Inspections | info@oahuinspections.com | (808) 425-9530 | Inspectors | Honolulu · Honolulu County | — | — |
| O'connor Plumbing LLC | O'connor Plumbing LLC | office@oconnorplumbing.com | (949) 510-1522 | Other | Makawao · Maui County | — | — |
| Oahu Electric And Air | Oahu Electric And Air | — | (808) 556-8283 | Electricians | Waipahu · Honolulu County | — | — |
| Oahu Garage Doors LLC | Oahu Garage Doors LLC | info@oahugaragedoors.com | (808) 625-5759 | Windows, patio, painters | Waipahu · Honolulu County | — | — |
| Oahu Metal & Glazing LLC | Oahu Metal & Glazing LLC | cgauthe@omglazing.com | (808) 591-1052 | Windows, patio, painters | Honolulu · Honolulu County | — | — |
| Oahu Plumbing & Sheet Metal | Oahu Plumbing & Sheet Metal | — | (808) 245-9479 | HVAC | Lihue · Kauai County | — | — |
| Oahu Pro Painters | Oahu Pro Painters | — | (808) 488-8338 | Windows, patio, painters | Aiea · Honolulu County | — | — |
| Oahu Roofing & Repairs Honolulu | Oahu Roofing & Repairs Honolulu | — | (808) 746-7377 | Other roofers | Honolulu · Honolulu County | — | — |
| Oasis Pool Service | Oasis Pool Service | — | (808) 212-8606 | Pool | Kapaʻa · Kauai County | — | — |
| Oasis Pools And Spa | Oasis Pools And Spa | oasispoolandspahawaii@gmail.com | (808) 850-5150 | Pool | Honolulu · Honolulu County | — | — |
| Oceanic Companies INC | Oceanic Companies INC | oci@oceaniccompanies.com | (808) 682-0662 | HVAC | Kapolei · Honolulu County | — | — |
| Oceanic Landscaping LLC | Oceanic Landscaping LLC | oceaniclandscaping@gmail.com | (808) 342-7347 | Windows, patio, painters | Honolulu · Honolulu County | — | — |
| Off Shore Air INC | Off Shore Air INC | doug@offshoreair.com | (808) 557-7424 | HVAC | Waikoloa · Hawaii County | — | — |
| Ohana Building Supply INC | Ohana Building Supply INC | sales@ohanabuildingsupply.com | (808) 833-8338 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Ohana Construction Inc. | Ohana Construction Inc. | — | (808) 999-0941 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Ohana Control Systems INC | Ohana Control Systems INC | — | (808) 842-5888 | Alarm and generators | Honolulu · Honolulu County | — | — |
| Ohana Custom Homes INC | Ohana Custom Homes INC | jl@ohanacustomhomes.com | (239) 251-3350 | GC, remodel, ADU | Hanalei · Kauai County | — | — |
| Ohana Pool & Spa | Ohana Pool & Spa | — | (808) 661-0327 | Pool | Lahaina · Maui County | — | — |