HCC §25-6-34

Size and height limits for accessory dwelling units

Read the official text at hawaiicounty.gov ↗

An accessory dwelling unit (ADU) can be no larger than 1,250 square feet of living space, not counting a lanai, garage, or carport. It also cannot be taller than the height limit for the zone where it is built.

contractorsdevelopershomeownerslandowners

The ordinance, as written (Hawaiʻi County) — Height and size limit

A copy, taken August 21, 2026. The version published by Hawaiʻi County is the one that governs, and it may have changed since. Check it before relying on anything here.

An accessory dwelling unit shall not exceed one thousand two hundred and fifty square feet in living area, exclusive of any lanai, garage, or carport, and further shall not exceed the height limit for the zoning district in which the building site is situated. (1996, ord 96-160, sec 2; ratified April 6, 1999; am 2024, ord 24-70, sec 10.)25-6-34 25-131 SUPP. 17 (1-2025)

Read the official text at hawaiicounty.gov ↗as published Jul 16, 2026our copy taken Aug 21, 2026

Published by the County of Hawaiʻi Office of the County Clerk.

LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.