State building permit guide
Hawaii building permits — complete guide (2026)
Hawaii has the highest permit costs in the nation and among the most complex codes, driven by seismic, hurricane, and tsunami risk requirements. Each county operates its own permit system with significant differences between islands.
Avg cost: $300–$1,500
Processing: 4–16 weeks
~8,000 permits/year
4 counties (one per island group) counties
$300–$1,500Average permit cost
4–16 weeksProcessing time
~8,000Permits issued/year
PartialADU-friendly
Hawaii has four counties — Honolulu (Oahu), Hawaii County (Big Island), Maui County (Maui/Molokai/Lanai), and Kauai County. Each has its own permitting system, fees, and timelines. Honolulu has the highest volume and longest wait times. All counties have stringent seismic, hurricane, and flood requirements that add cost and complexity.
Permit costs by type — Hawaii
| Permit type | Fee range | Processing time | Notes |
|---|---|---|---|
| Electrical | $150–$400 | 2–7 days | Licensed electrician required statewide |
| Plumbing | $125–$350 | 2–7 days | Licensed plumber required |
| HVAC / Mechanical | $150–$450 | 2–7 days | AC permits high volume in Honolulu |
| Roofing | $200–$600 | 2–7 days | Hurricane-resistant materials often required |
| New Construction | $1,500–$6,000+ | 8–24 weeks | Honolulu plan review among slowest in US |
| Room Addition | $600–$2,000 | 4–12 weeks | Seismic engineering required |
| Pool | $300–$900 | 3–8 weeks | Seismic and flood zone compliance |
| Solar | $150–$500 | 2–7 days | Hawaii has highest solar penetration in US |
| Deck / Patio | $200–$700 | 2–6 weeks | Wind and seismic loads required |
| ADU / Ohana unit | $400–$1,200 | 3–8 weeks | Traditional Hawaii concept — county rules vary |
How to get a building permit in Hawaii
1
Identify your county permit office
Contact the building division for your island: Honolulu (DPP), Hawaii County, Maui County, or Kauai County. Each has different processes and timelines.
2
Hire a Hawaii-licensed architect or engineer
Most structural projects require plans stamped by a Hawaii-licensed professional. The state has specific design requirements for seismic, wind, and flood zones.
3
Submit for plan review
Honolulu plan review is notoriously slow — budget 8–16 weeks for structural projects. Other counties are somewhat faster. Online submission is partial in Honolulu.
4
Pay fees
Hawaii permit fees are among the highest in the US, calculated as a percentage of project valuation.
5
Inspections
Hawaii requires phase inspections. On neighbor islands, inspection availability can be limited — schedule well in advance.
Permit costs by county — top Hawaii counties
Honolulu (Oahu) County
$400–$1,500
6–20 weeks
Hawaii (Big Island) County
$300–$1,000
4–12 weeks
Maui County
$350–$1,200
4–14 weeks
Kauai County
$300–$1,000
3–10 weeks
Frequently asked questions — Hawaii permits
Why are Hawaii permits so expensive and slow?
Hawaii's combination of seismic zone, hurricane exposure, tsunami risk, and flood zones creates complex engineering requirements. Honolulu's DPP is chronically understaffed relative to permit volume.
What is an Ohana unit in Hawaii?
An Ohana unit is Hawaii's traditional term for an accessory dwelling unit — a second dwelling on a single-family lot, traditionally for extended family. Each county has its own Ohana unit regulations.
Does Hawaii have a solar permit fast-track?
Yes. Hawaii adopted a streamlined solar permitting process for standard residential systems. Many counties approve simple solar permits within days.
What seismic zone is Hawaii in?
Hawaii is in Seismic Design Category D or E depending on location — among the highest in the US. All structural construction must comply with enhanced seismic design requirements.
Data sources: US Census Bureau BPS 2024 · Hawaii Hawaii Department of Commerce and Consumer Affairs · Shovels.ai permit aggregator