Garage Conversions: Honolulu vs Pearl City
How do garage conversions rules compare between Honolulu, HI and Pearl City, HI?
Honolulu and Pearl City have similar restriction levels.
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 →Pearl City, HI
Honolulu County
Converting a garage into living space in Pearl City is treated as an ADU under the Land Use Ordinance, requires building permits, and usually requires replacement off-street parking.
View full Pearl City rules →Key Facts Comparison
| Fact | Honolulu | Pearl City |
|---|---|---|
| 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.
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.
Pearl City FAQ
Can I legally convert my garage into a bedroom?
Yes, if it meets ADU requirements under Sec. 21-5.720, you provide replacement parking, and you obtain a building permit. Short-term rental is not allowed.
What if a prior owner converted the garage without permits?
You may qualify for an after-the-fact permit if the work was completed before September 14, 2015. Contact DPP for case-specific guidance.
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