Hawaii permit requirements

We have read and dated 26 permit rules across 2 jurisdictions in Hawaii. They do not all say the same thing: shed thresholds alone run from 120 to 200 sq ft across 2 of them.

Jurisdictions: 2
Verified rules: 26
Permit always required: 10
Depends on the project: 14

Do you need a building permit in Hawaii?

Usually it depends on the size of the job, and the size that decides it is not set by Hawaii: permits are issued by the city or county, not the state, so the rule that governs your project is the one your own jurisdiction publishes. 10 of those local rules require a permit outright, 14 depend on a size or scope condition the office publishes, and 0 need none. Hawaii sets the building code those local rules derive from; your city or county sets the threshold and the fee.

Do Hawaii jurisdictions agree?

Every row below is a measurement at least two Hawaii jurisdictions publish, compared against each other. This is the question a statewide answer cannot settle, because the number that governs your project is the one your own city or county publishes.

Project	Published threshold	Jurisdictions	Agreement
Shed	120 to 200 sq ft	2	2 different numbers
Fence	6 feet	2	Same number in all 2

1 of 2 comparable measurements is uniform across Hawaii; 1 is not. Latest verification 2026-10-03.

Where Hawaii jurisdictions split

The verdict for each project across the 2 Hawaii jurisdictions we cover. On 4 of 13 projects they do not give the same answer, which is why a statewide answer is not one.

Project	Permit required	Depends	Across the state
Deck	1	1	Answer varies
Electrical	1	1	Answer varies
HVAC	1	1	Answer varies
Plumbing	1	1	Answer varies
Bathroom Remodel		2	Same answer everywhere
EV Charger	2		Same answer everywhere
Fence		2	Same answer everywhere
Roof Replacement		2	Same answer everywhere
Shed		2	Same answer everywhere
Solar	2		Same answer everywhere
Water Heater	2		Same answer everywhere
Patio		1	Same answer everywhere
Pool		1	Same answer everywhere

Building without a permit in Hawaii

Hawaii has no statewide crime or fine for building without a permit. Building permits are issued and enforced by the four counties, and state law gives each county the power to make and enforce ordinances on the inspection of buildings and to fix the penalty for breaking them as a misdemeanor, petty misdemeanor, or violation.

Penalties, the as-built path, and what the statute actually says

What you can build without a permit in Hawaii

0 of the 24 answered rules across Hawaii need no permit at all and 14 turn on a size or scope condition the jurisdiction publishes, by project and jurisdiction, in each office's own words.

The exemptions and conditions, jurisdiction by jurisdiction

What each Hawaii jurisdiction publishes

One line per jurisdiction, written from its own rules rather than from a state summary. This is the section that used to be a list of links, and the states with the fewest jurisdictions to compare are the ones it says the most about.

Hawaii County 13 rules
3 of 12 projects always need a permit and 9 turn on the size or scope of the work. Only EV Charger, solar and water heater work always needs one. Published thresholds include deck at 30 inches and fence at 6 feet. 1 question is unresolved because the jurisdiction publishes no answer.
Honolulu 13 rules
7 of 12 projects always need a permit and 5 turn on the size or scope of the work. The ones that depend on the project are bathroom remodel, fence, patio, roof replacement and shed. Published thresholds include shed at 120 sq ft and fence at 6 feet. 1 question is unresolved because the jurisdiction publishes no answer.