| K-1 Construction LLC | K-1 Construction LLC | — | (949) 679-5800 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| K-Aloha Roofing | K-Aloha Roofing | — | (808) 650-5012 | Other roofers | Aiea · Kalawao County | — | — |
| K-Deck Canvas Corp | K-Deck Canvas Corp | k@kdeckcanvas.com | (808) 242-2889 | Windows, patio, painters | Wailuku · Maui County | — | — |
| Kaapana Landscaping LLC | Kaapana Landscaping LLC | kaapanakruise@gmail.com | (808) 780-5309 | Tree | Kapaʻa · Kauai County | — | — |
| Kaena Electric LLC | Kaena Electric LLC | krewm@kaenaelectric.com | (808) 429-3598 | Electricians | Kaneohe · Honolulu County | — | — |
| Kahala Pool & Spa | Kahala Pool & Spa | john@kahalapools.com | (808) 396-1900 | Pool | Honolulu · Honolulu County | — | — |
| Kahanakoa Construction Inc. | Kahanakoa Construction Inc. | — | (808) 960-1511 | GC, remodel, ADU | Kailua-Kona · Kalawao County | — | — |
| Kahekili Electric LLC | Kahekili Electric LLC | kdenisi@kahekilielectric.com | — | Electricians | Wailuku · Maui County | — | — |
| Kahului Roofing | Kahului Roofing | — | (808) 758-5256 | Other roofers | Kahului · Maui County | — | — |
| Kai Pono Builders | Kai Pono Builders | — | (808) 885-8082 | Pool | Waimea · Hawaii County | — | — |
| Kai Vista Pools | Kai Vista Pools | — | (808) 494-2572 | Pool | Kailua-Kona · Hawaii County | — | — |
| Kailua Plumbing LLC | Kailua Plumbing LLC | info@kailuaplumbing.com | (808) 444-0910 | Other | Kailua · Honolulu County | — | — |
| Kaimana Electric INC | Kaimana Electric INC | info@kaimanaelectric.com | (808) 867-1801 | Electricians | Kihei · Maui County | — | — |
| Kalaeloa Desalco LLC | Kalaeloa Desalco LLC | — | (808) 272-4778 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Kalakoa Painting LLC | Kalakoa Painting LLC | — | (808) 744-0082 | Windows, patio, painters | Kailua · Kalawao County | — | — |
| Kaleo's Tree Services Inc. | Kaleo's Tree Services Inc. | — | (808) 639-6761 | Tree | Kilauea · Kauai County | — | — |
| Kalo Collective Realty | Kalo Collective Realty | — | (808) 450-6386 | Property managers | Waianae · Kalawao County | — | — |
| Kalu Glass Co. | Kalu Glass Co. | — | (808) 486-7488 | Windows, patio, painters | Aiea · Kalawao County | — | — |
| Kama Kani Roofing Services Inc. | Kama Kani Roofing Services Inc. | — | (808) 313-2991 | Other roofers | Honokaa · Hawaii County | — | — |
| Kama'aina Custom Homes LLC | Kama'aina Custom Homes LLC | — | (808) 896-4864 | GC, remodel, ADU | Honokaa · Hawaii County | — | — |
| Kamaaina Landscaping | Kamaaina Landscaping | — | (808) 333-6807 | Tree | Kamuela · Hawaii County | — | — |
| Kamikaze Electronics | Kamikaze Electronics | — | (808) 877-7777 | Alarm and generators | Kahului · Maui County | — | — |
| Kamoku Contracting LLC | Kamoku Contracting LLC | kehaukamoku@icloud.com | (808) 633-4365 | GC, remodel, ADU | Kula · Maui County | — | — |
| Kaneshiro Electric Inc. | Kaneshiro Electric Inc. | skaneshiro8@hawaii.rr.com | (808) 220-6742 | Electricians | Ewa Beach · Kalawao County | — | — |
| Kapaa Swimming Pool | Kapaa Swimming Pool | — | (808) 822-3842 | Pool | Kapaʻa · Kauai County | — | — |
| Kapcity Construction INC | Kapcity Construction INC | keenan@kapcityconstruction.com | (808) 397-8102 | GC, remodel, ADU | Aiea · Honolulu County | — | — |
| Kapili Roofing & Painting | Kapili Roofing & Painting | customerservice@kapiliconstruction.com | (808) 621-7663 | Other roofers | Waipahu · Kalawao County | — | — |
| Kaua'i Realty Inc. | Kaua'i Realty Inc. | info@kauairealty.net | (808) 245-1651 | Property managers | Lihue · Kauai County | — | — |
| Kaua'i Tree Tribe | Kaua'i Tree Tribe | — | (808) 855-0367 | Tree | Koloa · Kauai County | — | — |
| Kauai Air Conditioning & Plumbing | Kauai Air Conditioning & Plumbing | info@kauaiac.com | (808) 353-0888 | HVAC | Kapaʻa · Kauai County | — | — |
| Kauai Calls | Kauai Calls | — | (888) 822-2403 | Property managers | Kapaʻa · Kauai County | — | — |
| Kauai Coatings | Kauai Coatings | — | (808) 430-1815 | Windows, patio, painters | Lihue · Kauai County | — | — |
| Kauai Cove Cottages | Kauai Cove Cottages | info@kauaicove.com | (808) 651-0279 | Pool | Koloa · Kauai County | — | — |
| Kauai Dreams Realty | Kauai Dreams Realty | — | (808) 822-7774 | Property managers | Kapaʻa · Kauai County | — | — |
| Kauai Eco-Restoration | Kauai Eco-Restoration | kauaiecoblasting@gmail.com | (808) 278-8277 | Restoration | Kapaʻa · Kauai County | — | — |
| Kauai General Services | Kauai General Services | — | (808) 651-1422 | Pool | Kalaheo · Kauai County | — | — |
| Kauai Home Inspection | Kauai Home Inspection | — | (808) 283-9071 | Inspectors | Koloa · Kauai County | — | — |
| Kauai Home Repair LLC | Kauai Home Repair LLC | — | (808) 482-5746 | Restoration | Kalaheo · Kauai County | — | — |
| Kauai Island Homes LLC | Kauai Island Homes LLC | — | (808) 900-3993 | Property managers | Lihue · Kauai County | — | — |
| Kauai Island Roofing LLC | Kauai Island Roofing LLC | aliagroofing@gmail.com | (808) 652-1613 | Other roofers | Anahola · Kauai County | — | — |