| Kaleo's Tree Services Inc. | Kaleo's Tree Services Inc. | — | (808) 639-6761 | Tree | Kilauea · Kauai County | — | — |
| Kapaa Swimming Pool | Kapaa Swimming Pool | — | (808) 822-3842 | Pool | Kapaʻa · Kauai 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 | — | — |
| Kauai Island Screen Specialists | Kauai Island Screen Specialists | — | (808) 720-2688 | Windows, patio, painters | Kilauea · Kauai County | — | — |
| Kauai Landscaping Professionals | Kauai Landscaping Professionals | — | (808) 278-3651 | Tree | Lihue · Kauai County | — | — |
| Kauai Maintenance & Construction INC | Kauai Maintenance & Construction INC | — | (808) 635-5040 | GC, remodel, ADU | Kalaheo · Kauai County | — | — |
| Kauai Mechanical INC | Kauai Mechanical INC | info@kauaimechanical.com | (808) 822-2770 | HVAC | Lihue · Kauai County | — | — |
| Kauai Mold Water Fire | Kauai Mold Water Fire | contact@kauaimold.com | (808) 635-8100 | Restoration | Kilauea · Kauai County | — | — |
| Kauai Nursery & Landscaping INC | Kauai Nursery & Landscaping INC | knl@kauainursery.com | (808) 245-7747 | GC, remodel, ADU | Lihue · Kauai County | — | — |
| Kauai Pool & Spa | Kauai Pool & Spa | brad@kauaipoolandspa.com | (808) 634-0004 | Pool | Kauai · Kauai County | — | — |
| Kauai Pool Care | Kauai Pool Care | — | (808) 635-8369 | Pool | Kapaʻa · Kauai County | — | — |
| Kauai Refrigeration Services. | Kauai Refrigeration Services. | — | (808) 245-2901 | HVAC | Lihue · Kauai County | — | — |
| Kauai Remodeling INC | Kauai Remodeling INC | — | (808) 634-8612 | Other roofers | Kapaa · Kauai County | — | — |
| Kauai Rentals And Real Estate | Kauai Rentals And Real Estate | rachono@gmail.com | (808) 245-3343 | Property managers | Lihue · Kauai County | — | — |
| Kauai Screens & Jalousie INC | Kauai Screens & Jalousie INC | — | (808) 245-6181 | Windows, patio, painters | Lihue · Kauai County | — | — |
| Kauai Seascapes Nursery INC | Kauai Seascapes Nursery INC | info@kauaiseascapesnursery.com | — | Windows, patio, painters | Kilauea · Kauai County | — | — |
| Kauai Seaside Properties | Kauai Seaside Properties | — | (808) 212-1400 | Property managers | Kapaʻa · Kauai County | — | — |
| Kauai Society Of Artists | Kauai Society Of Artists | — | (808) 245-2782 | Windows, patio, painters | Lihue · Kauai County | — | — |
| Kauai Vacation Rentals & Real Estate INC | Kauai Vacation Rentals & Real Estate INC | — | (808) 245-8841 | Property managers | Lihue · Kauai County | — | — |
| Kauaʻi Community College | Kauaʻi Community College | — | (808) 245-8311 | HVAC | Lihue · Kauai County | — | — |
| Ken Do Construction INC | Ken Do Construction INC | — | (808) 639-3525 | GC, remodel, ADU | Koloa · Kauai County | — | — |
| Kikiaola Construction Co. | Kikiaola Construction Co. | — | (808) 338-0021 | GC, remodel, ADU | Waimea · Kauai County | — | — |
| Kilohana Electric | Kilohana Electric | — | (808) 822-0800 | Electricians | Kapaʻa · Kauai County | — | — |
| Koloa Kai | Koloa Kai | — | (808) 638-2501 | Property managers | Kalaheo · Kauai County | — | — |
| Kr Landscaping Kauai | Kr Landscaping Kauai | — | (808) 634-7530 | Tree | Kapaʻa · Kauai County | — | — |
| Kukui It | Kukui It | — | (808) 822-0080 | Alarm and generators | Lihue · Kauai County | — | — |
| Layton Construction | Layton Construction | — | (808) 245-8680 | GC, remodel, ADU | Lihue · Kauai County | — | — |
| Lifeline Fire & Security A Pye-Barker Fire & Safety Company | Lifeline Fire & Security A Pye-Barker Fire & Safety Company | — | (808) 548-5433 | Alarm and generators | Kapolei · Kauai County | — | — |