How East Honolulu Handles Accessory Structures: A Practical Guide
East Honolulu maintains 23 local ordinances across all categories, and 3 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where East Honolulu falls on the strict-to-permissive spectrum compared to other cities.
Shed & Carport Rules
In East Honolulu (City and County of Honolulu), a one-story detached storage shed accessory to a home is exempt from a building permit when the aggregate floor area of such structures is 120 square feet or less, but the shed must still meet Land Use Ordinance yard and use limits.
Key details: Permit exemption: 1-story detached shed; aggregate 120 sq ft or less (ROH Ch. 18 / IBC-IRC). Jurisdiction: City and County of Honolulu. Yard rule: No structures in required yard except listed exceptions (LUO 21-4.30). Residential yards: 10 ft front; 5 ft side/rear for dwellings (Table 21-3.2). Max building area: 50% of zoning lot.
Erecting a shed that exceeds the permit-exemption threshold without a building permit, or that encroaches into a required yard or exceeds lot coverage limits, is a violation of ROH Chapters 18 and 21 subject to Department of Planning and Permitting enforcement, including notices of violation, stop-work orders, after-the-fact permit requirements, and civil fines under ROH Section 21-2.150.
East Honolulu is more permissive than most cities when it comes to shed & carport rules. That said, there are still limits.
Garage Conversions
In East Honolulu (City and County of Honolulu), an existing legally established accessory structure such as a detached garage in a residential or country district may be converted into an accessory dwelling unit, and the Director may waive the floor-area cap or the extra parking space where viable constraints exist; a one- or two-car garage in a required yard may not be converted to a non-garage use.
Key details: Code Section: ROH Ch. 21 (ADU conversion provision); 21-2.140-1(a). Jurisdiction: City and County of Honolulu. Allowed conversion: Legally established structure, attic, or basement to ADU. Floor-area / parking relief: Director may waive on finding of viable constraints. Yard-encroaching garage: May not be converted to non-garage use (21-2.140-1(a)).
Converting a garage or accessory structure to a dwelling without the required building permit, or converting a yard-encroaching garage in violation of LUO Section 21-2.140-1(a), is a violation of ROH Chapter 21 subject to Department of Planning and Permitting enforcement under Section 21-2.150, including notices of violation, orders to correct or remove, after-the-fact permit requirements, and civil fines.
ADU Rules
East Honolulu (City and County of Honolulu) permits one accessory dwelling unit on residential and country lots of 3,500 square feet or more under the Land Use Ordinance, capping the ADU at 400 square feet on lots up to 4,999 square feet and 800 square feet on lots of 5,000 square feet or more, with one extra off-street parking space and a recorded covenant.
Key details: Code Section: ROH 21-5.720 (Ord. 15-41). Jurisdiction: City and County of Honolulu (LUO, ROH Ch. 21). Permitted districts: Residential (R-3.5 to R-20) and Country. Minimum lot size: 3,500 sq ft. Max ADU size: 400 sq ft (lots 3,500-4,999); 800 sq ft (lots 5,000+).
An ADU built or used in violation of Chapter 21, including failure of the owner or the owner's heir, successor, or assign to abide by the recorded covenant, is a violation of the Land Use Ordinance and is grounds for enforcement by the Director of the Department of Planning and Permitting under ROH Section 21-2.150, which authorizes notices of violation, orders to correct, and civil fines for continued noncompliance.
The Bottom Line
East Honolulu's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming East Honolulu is broadly strict or permissive.
All of the above reflects East Honolulu's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.