Plumbing Contractor Permit Requirements in Kailua, HI
Complete permit and license guide for starting a plumbing contractor in Kailua, Honolulu County, Hawaii.
Not legal advice. Requirements may change — always verify with your local government authority before applying. This guide was compiled from public and official sources (last updated ) and has not yet been independently source-verified — confirm each requirement before acting on it.
Federal — start here
1 stopEIN (Employer Identification Number)
Required if you have employees or operate as an LLC or corporation. Free from the IRS.
Official government sourceFreeImmediate (online application)
Free
Immediate (online application)
State of Hawaii
1 stopHawaii Department of Taxation — General Excise Tax License
Hawaii does not have a traditional sales tax but requires all businesses to pay a General Excise Tax (GET) on gross income from business activities. The GET rate is 4% (4.5% in Honolulu). All businesses must register for a GET license with the Hawaii Department of Taxation.
Official government source$20 (one-time registration fee)2–4 weeks (by mail) or immediate (in-person)
$20 (one-time registration fee)
2–4 weeks (by mail) or immediate (in-person)
City of Kailua / Honolulu County
3 stopsHawaii Board of Plumbing — Plumbing Contractor License
Plumbing contractors in Hawaii must hold a C-42 Plumbing Contractor License from the Hawaii Contractors License Board. Requires a Master Plumber and passing a state exam.
Official government source$250–$400 (initial)4–8 weeks
$250–$400 (initial)
4–8 weeks
City and County of Honolulu — Permits and Licenses — Business License
Kailua is within the City and County of Honolulu jurisdiction. Businesses must comply with Honolulu city requirements and the state GET license. This license must be renewed annually and displayed at your place of business.
Official government source$50–$500/year depending on business type and gross revenues1–3 weeks
$50–$500/year depending on business type and gross revenues
1–3 weeks
Honolulu County / Kailua Plumbing Permit (per project)
A separate permit must be pulled with the local building/plumbing department for each job. Inspections are required upon job completion.
Official government source$50–$300 per project1–5 business days
$50–$300 per project
1–5 business days
Terminus
Open for business — est. $400–$1,200 · 4–10 weeks to obtain all licenses
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Official Sources
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