Garage Conversions: East Honolulu vs Honolulu
How do garage conversions rules compare between East Honolulu, HI and Honolulu, HI?
East Honolulu and Honolulu have similar restriction levels.
East Honolulu, HI
Honolulu County
Converting a garage into living space in East Honolulu is treated as creating an ADU under the LUO and requires building permits plus replacement parking for the original garage use.
View full East Honolulu rules →Honolulu, HI
Honolulu County
Honolulu's LUO § 21-5.720 allows garage and accessory structure conversions into accessory dwelling units in residential zones, subject to floor area limits, parking requirements, and a building permit from DPP.
View full Honolulu rules →Key Facts Comparison
| Fact | East Honolulu | Honolulu |
|---|---|---|
| - | - | |
| Minimum lot size | - | 3,500 sq ft |
| Max ADU size (small lot) | - | 400 sq ft (3,500–4,999 sq ft lot) |
| Parking requirement | - | 1 space per ADU (may be waived) |
| Transit waiver radius | - | Within 0.5 mile of rail station |
| Governing section | - | LUO § 21-5.720 |
Highlighted rows indicate differences between cities.
East Honolulu FAQ
Can I convert my garage into a rental unit?
Yes, if it meets ADU requirements including parking replacement, setbacks, lot size, and you obtain proper building permits. Short-term rentals are not allowed.
What if my garage was converted years ago without a permit?
You may qualify for an after-the-fact permit if the conversion was completed before September 14, 2015. Contact DPP to review your specific situation.
Honolulu FAQ
Can I convert my garage to a rental unit on Oahu?
Yes, if your lot is at least 3,500 sq ft in a residential zone and you owner-occupy the property. You need a building permit from DPP and must meet floor area, parking, and building code requirements under LUO § 21-5.720.
Do I need to add a parking space when converting my garage to an ADU?
Generally yes, one additional off-street parking space is required. It may be waived if your lot is within 0.5 miles of a Honolulu rail station or if topography makes parking infeasible per DPP.
Are there any fee waivers for ADU conversions?
Starting July 1, 2025, qualifying ADU projects are exempt from certain wastewater system facility charges. Regular building permit fees based on project value still apply.
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