02-21-2026, 02:23 AM
Most sources seem to point to this for Hawai'i Country:
https://records.hawaiicounty.gov/Weblink...a)(18).pdf
https://hawaii-county-public-works-hawai...rmit-Excep
Structure must be detached, single-story, and the floor area cannot be greater than 600 square feet for land zoned as agricultural or 120 (or maybe 200? there is a conflict in the sources) square feet for land that is not zoned as agricultural. Electrical and plumbing permits are a separate issue.
There's also state law - https://law.justia.com/codes/hawaii/titl...ion-46-88/
Which allows for a wider range and size of agricultural buildings, although it requires notice to and approval from the County that the project is exempt from requiring a building permit.
Best bet is to CYA and call the Department of County Works and see what they say (and then get that in writing and notarized ;)
https://records.hawaiicounty.gov/Weblink...a)(18).pdf
https://hawaii-county-public-works-hawai...rmit-Excep
Structure must be detached, single-story, and the floor area cannot be greater than 600 square feet for land zoned as agricultural or 120 (or maybe 200? there is a conflict in the sources) square feet for land that is not zoned as agricultural. Electrical and plumbing permits are a separate issue.
There's also state law - https://law.justia.com/codes/hawaii/titl...ion-46-88/
Which allows for a wider range and size of agricultural buildings, although it requires notice to and approval from the County that the project is exempt from requiring a building permit.
Best bet is to CYA and call the Department of County Works and see what they say (and then get that in writing and notarized ;)