Building permits, zoning and septic rules across Hawaii

At a glance

Building permits

0 counties with none; 4 required; 1 limited¹²³

Zoning

5 counties with zoning; 0 without county-wide zoning⁴⁸

No building permit and no zoning

0 counties⁹

Septic approval

State Department of Health construction approval; $100 new-system filing fee, $25 for additions or modifications⁵

RV living

2 counties have an answer: 1 temporary-only, 1 limited; 3 unconfirmed⁶

Tiny homes

3 counties have an answer: 2 allowed with conditions, 1 limited; 2 unconfirmed⁷

Owner-builder

Conditional contractor-license exemption; building permits and inspections still apply where required¹⁰¹¹

Wells

Commission on Water Resource Management approval for construction, modification or sealing of water wells¹²

Who to call

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Which Hawaii counties don't require a building permit?

No Hawaii county has a blanket residential building-permit exemption, and the county counts here concern unincorporated land.¹ Building permits are required in Kauai County, Hawaii County, Maui County and Honolulu County.² Kalawao County has limited building-permit requirements, rather than a blanket exemption.³

Hawaii’s state building codes cover residential construction, with county adoption and amendment provisions.¹³ Hawaii’s owner-builder exemption concerns contractor licensing; required building permits and county inspections remain part of an owner-builder project.¹¹ Qualifying agricultural structures may receive a separate exemption, but dwellings and lodging units do not qualify.¹⁴

Which Hawaii counties have no zoning?

Hawaii has 0 counties without county-wide zoning and 5 counties with zoning; no county combines no residential building permit with no county-wide zoning.⁸⁴⁹ Hawaii county zoning authority includes building location, setbacks, density, lot coverage, lot size and the duration of land uses, subject to statutory exclusions.¹⁵

Hawaii also classifies land into urban, rural, agricultural and conservation state land-use districts.¹⁶ For agricultural use, counties determine agricultural-district minimum lot sizes, subject to a state floor of 1 acre and statutory exceptions.¹⁷ Ask the county planning office to identify both the state land-use district and county zoning for the parcel before designing a dwelling.¹⁶¹⁵

Who issues septic permits in Hawaii?

The Hawaii Department of Health is the septic authority across all 5 counties, through its Wastewater Branch.¹⁸¹⁹ A Hawaii septic system needs construction approval before construction, modification of construction or modification of use proceeds; exemption from separate wastewater permit coverage does not remove that approval requirement.⁵

The application requires engineer certification and a commitment to submit a final inspection report; the filing fee is $100 for a new system and $25 for an addition or modification.⁵ The final engineer inspection report must be furnished within 30 days after construction completion.²⁰ Buildings within or near an available public sewer, as determined by the director, must connect to that sewer.²¹ For a sewer-served property, direct wastewater questions to the relevant county department or private sewer provider.¹⁹

Can you live in an RV or tiny home on your land in Hawaii?

Hawaii has county-specific RV answers for 2 counties: Kauai County is temporary-only and Honolulu County is limited; the other 3 counties remain unconfirmed.⁶ State vehicle-habitation law requires private-property authorization for both parking and habitation, but counties may enact superseding ordinances; owner permission alone does not settle county land-use approval.²²²³

Tiny-home answers exist for 3 counties: Kauai County and Hawaii County allow qualifying tiny homes with conditions, while Maui County has a limited answer; 2 counties remain unconfirmed.⁷ Start with the Hawaii tiny-home county list and the linked county’s requirements.⁷ Agricultural areas leased under the special agricultural subdivision provision cannot have permanent or temporary dwellings, including trailers and campers, constructed on the leased area.²⁴

Where are the best Hawaii counties for a bolthole?

Kauai County leads the Bolthole Index’s Hawaii county scores at 62, followed by Hawaii County at 58 and Maui County at 56; all require residential building permits, have zoning and use state septic authority.²⁵ Compare Kauai County, Hawaii County and Maui County for those permitting conditions before choosing a parcel.²⁵

The median county farmland value is $12,084 per acre, with Hawaii County at $8,886 per acre; these are farmland statistics, not asking prices for a buildable lot.²⁶ Across the counties with tax data, the median effective property-tax rate is 0.25% and the median county property-tax bill is $1,641 annually.²⁷ A high county score still comes with building, zoning and wastewater requirements.²⁵

Do you need a well or state-highway driveway permit in Hawaii?

Hawaii water-well construction, modification and sealing require a Commission on Water Resource Management permit statewide, including production, exploratory and monitoring wells.¹² Well work must use a C-57 licensed well driller; injection wells and geothermal wells have different state permitting authorities.¹² Call the Commission on Water Resource Management for the parcel’s well-approval route.¹²

Water-well approval and access approval are separate steps: routine construction involving a residential driveway within a state-highway right-of-way falls under Hawaii Department of Transportation requirements.²⁸ Applications go to the applicable HDOT district, and work cannot begin before district approval.²⁹ The fee varies, with a $10 minimum fee and a $1,000 minimum bond.³⁰

Watch-outs

• Hawaii’s agricultural building exemption excludes dwellings and does not waive floodplain requirements; county review must precede qualifying exempt work.³¹
• Hawaii’s urban residential accessory-dwelling provisions exclude land outside the urban district and certain rural, low-density residential districts; do not assume the provisions authorize another rural dwelling.³²
• We could not confirm a statewide tiny-home occupancy rule or minimum dwelling size; ask the applicable county building and planning offices about the proposed home.³³¹⁵

Sources

1. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Hawaii counties that do not require a residential building permit in unincorporated areas
2. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Hawaii counties that require a residential building permit in unincorporated areas
3. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Hawaii counties that require a residential building permit only in some cases (for example floodplain or certain structures)
4. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Hawaii counties with county zoning
5. Hawaii: Chapter 11-62, Hawaii Administrative Rules (Unofficial) – Wastewater Branch, quoted and re-checked
6. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Hawaii counties' answers on living in an RV on your own land
7. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Hawaii counties' answers on living in a tiny home on your own land
8. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Hawaii counties with no county-wide zoning
9. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Hawaii counties with neither a residential building permit nor county-wide zoning
10. Hawaii: Hawaii Revised Statutes §444-2.5, Owner-builder exemption, quoted and re-checked
11. Hawaii: Hawaii Revised Statutes §444-9.1, Issuance of building permits; owner-builder registration, quoted and re-checked
12. Hawaii: Hawaii Well Construction and Pump Installation Standards, quoted and re-checked
13. Hawaii: HRS §107-25 Hawaii state building codes; requirements, quoted and re-checked
14. Hawaii: HRS §46-88 Agricultural buildings and structures; exemptions from building permit and building code requirements, quoted and re-checked
15. Hawaii: HRS §46-4 County zoning, quoted and re-checked
16. Hawaii: Hawaii Revised Statutes § 205-2, Districting and classification of lands, quoted and re-checked
17. Hawaii: HRS §205-5 Rural districts, quoted and re-checked
18. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Who issues septic permits across Hawaii's counties: a state agency, a multi-county health district, or the county
19. Hawaii: Wastewater Branch – State of Hawaii, Department of Health, quoted and re-checked
20. Hawaii: Chapter 11-62, Hawaii Administrative Rules (Unofficial) – Wastewater Branch, quoted and re-checked
21. Hawaii: Chapter 11-62, Hawaii Administrative Rules (Unofficial) – Wastewater Branch, quoted and re-checked
22. Hawaii: HRS §291C-112: Certain uses of parked vehicles prohibited, quoted and re-checked
23. Hawaii: HRS §46-4 County zoning, quoted and re-checked
24. Hawaii: HRS §205-4.5, Permissible uses within the agricultural districts, quoted and re-checked
25. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: The 5 highest-scoring Hawaii counties on the Bolthole Index (off-grid and homestead land score out of 100), with each one's building-permit, zoning and septic answers
26. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Median farmland value per acre across Hawaii's counties (USDA census, the middle county's value; USD/acre), with the five least expensive counties
27. Bolthole Index county rulebook, 5 Hawaii counties, as of October 7, 2026: Median of Hawaii's county effective property tax rates and median county property tax bills
28. Hawaii: ROUTINE CONSTRUCTION / EXCAVATION WITHIN A STATE HIGHWAY, quoted and re-checked
29. Hawaii: Guide to Permits – Highways, quoted and re-checked
30. Hawaii: Routine Construction / Excavation Within a State Highway, quoted and re-checked
31. Hawaii: HRS §46-88 Agricultural buildings and structures; exemptions from building permit and building code requirements, quoted and re-checked
32. Hawaii: §46-4.8 Accessory dwelling units on residentially zoned lots, quoted and re-checked
33. Hawaii: Hawaii Revised Statutes §46-1.5, General powers and limitation of the counties, quoted and re-checked

Written October 10, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.