| Westside Glaziers INC | Westside Glaziers INC | kyle@westsideglaziersinc.com | (808) 329-7124 | Windows, patio, painters | Kona · Hawaii County | — | — |
| Westside Refinishing LLC | Westside Refinishing LLC | westsiderefin@gmail.com | (250) 769-6691 | GC, remodel, ADU | Waianae · Honolulu County | — | — |
| Wet Paint Corporation | Wet Paint Corporation | online@wetpaint.com | — | Windows, patio, painters | Kapaa · Kauai County | — | — |
| Wide Open Construction | Wide Open Construction | — | (808) 757-0775 | GC, remodel, ADU | Wailuku · Kalawao County | — | — |
| Wilcox Construction LLC | Wilcox Construction LLC | bids@wilcoxconstruction.com | (425) 774-4185 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Wilkinson Shake Roofing INC | Wilkinson Shake Roofing INC | wsrhawaii@gmail.com | (808) 456-5006 | Other roofers | Pearl City · Honolulu County | — | — |
| Will Kill Termites & Pests | Will Kill Termites & Pests | — | (808) 933-7378 | Pest, tile roofs | Hilo · Hawaii County | — | — |
| Williams Plumbing LLC | Williams Plumbing LLC | — | (801) 367-5814 | Other | Kailua · Honolulu County | — | — |
| Window Fashions Kauai Inc. | Window Fashions Kauai Inc. | — | (808) 634-3991 | Windows, patio, painters | Kapaʻa · Kauai County | — | — |
| Window Trends Of Kauai | Window Trends Of Kauai | kelly@windowtrends.com | (808) 332-9844 | Windows, patio, painters | Kalaheo · Kauai County | — | — |
| Window Works LLC | Window Works LLC | — | (808) 631-2618 | Windows, patio, painters | Kapaʻa · Kauai County | — | — |
| Window World Of Oahu | Window World Of Oahu | oahu@windowworld.com | (808) 670-1414 | Windows, patio, painters | Kailua · Honolulu County | — | — |
| Windows Hawaii | Windows Hawaii | hawaiiadmin@windows-hawaii.com | (808) 383-7233 | Windows, patio, painters | Kapolei · Honolulu County | — | — |
| Windowworld Inc. | Windowworld Inc. | — | (808) 834-1114 | Windows, patio, painters | Honolulu · Honolulu County | — | — |
| Windward Tree Service LLC | Windward Tree Service LLC | jay@windwardtreeservice.com | (808) 634-2717 | Tree | Kapaʻa · Kauai County | — | — |
| Woo's Electrical Service | Woo's Electrical Service | — | (808) 395-6866 | Electricians | Honolulu · Honolulu County | — | — |
| Woodbury Home Inspection Services | Woodbury Home Inspection Services | — | (808) 322-5174 | Inspectors | Kailua-Kona · Hawaii County | — | — |
| Woodrose Construction LLC | Woodrose Construction LLC | woodroseconstruction@gmail.com | — | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Woods Construction INC | Woods Construction INC | — | (586) 939-9991 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Wq Construction | Wq Construction | — | (808) 260-2875 | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Xin Yuan Construction INC | Xin Yuan Construction INC | agustinamingote@gmail.com | — | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Xmx Power | Xmx Power | — | (808) 651-5886 | Electricians | Princeville · Kauai County | — | — |
| Xtermco INC | Xtermco INC | — | (808) 591-2922 | Pest, tile roofs | Waipahu · Honolulu County | — | — |
| Yama's Roofing INC | Yama's Roofing INC | — | (808) 961-9248 | Other roofers | Hilo · Hawaii County | — | — |
| Yamada & Sons INC | Yamada & Sons INC | syamada@yamadasons.com | — | GC, remodel, ADU | Hilo · Hawaii County | — | — |
| Yk Drilling LLC | Yk Drilling LLC | info@ykdrilling.com | — | GC, remodel, ADU | Honolulu · Honolulu County | — | — |
| Z's Electric LLC | Z's Electric LLC | — | (808) 217-1608 | Electricians | Hilo · Hawaii County | — | — |
| Zen Construction LLC | Zen Construction LLC | — | (888) 694-6735 | GC, remodel, ADU | Holualoa · Hawaii County | — | — |
| Zmana Residential And Commercial Security Systems | Zmana Residential And Commercial Security Systems | — | (808) 425-1131 | Alarm and generators | Honolulu · Honolulu County | — | — |
| Zoe Builders INC | Zoe Builders INC | — | (808) 249-2002 | GC, remodel, ADU | Wailuku · Kalawao County | — | — |