What Doesn't Require a Building Permit in Honolulu: Hawaii's Permit Exemptions Explained
Not every construction activity in Honolulu requires a building permit. The IBC and ROH Chapter 16 exempt certain categories of work from permit requirements — but the exemptions have edges, and work that starts as exempt can become permit-required based on scope, location, or interaction with other systems. Understanding the line matters both for advising clients and for avoiding enforcement problems.
The basis for permit exemptions
Building permit requirements in Honolulu derive from ROH Chapter 16, which adopts the International Building Code with local amendments. IBC Section 105.2 lists work exempt from permit requirements, and ROH Chapter 16 carries these exemptions forward with some local modifications.
The IBC exemption list is not exhaustive — it covers the most common categories. Work not on the exemption list is presumed to require a permit. When in doubt, the conservative position is to get a DPP determination in writing rather than proceeding on the assumption that the work is exempt. An unpermitted structure that DPP later determines required a permit can result in a stop-work order, required demolition, and difficulties at resale.
Important note:Permit exemption does not mean code exemption. Work that is exempt from the building permit requirement must still comply with applicable code requirements. A 6-foot fence that doesn't require a permit must still comply with LUO height limits in the setback area.
Common exempt work categories and their edges
Replacement of existing work in kind — replacing a broken window with a window of the same size, patching stucco, replacing roof shingles on a like-for-like basis, repainting. The work must not change the structural system, change the use of a space, or increase the building's footprint.
Edge case: If the repair involves structural members (replacing rotted rafters, sistering joists) it is no longer ordinary maintenance and likely requires a permit. Replacing a window with a different size or type (different U-factor, different rough opening) may require a permit if energy code compliance is affected.
Interior and exterior painting, wallpaper, floor coverings, tile, and similar finish work. No permit required regardless of scope.
Edge case: Installing new drywall as part of a remodel — even if the intent is cosmetic — may require a permit if it affects fire ratings or egress.
Fences not exceeding 6 feet in height are generally exempt from building permit requirements in Honolulu residential districts. The fence must not be in a required yard setback where fences are prohibited or height-limited by the LUO.
Edge case: Fences in the front yard or side yard setback area have LUO height restrictions that are independent of the permit exemption. A 6-foot fence may be permit-exempt but still LUO-noncompliant if it exceeds the allowed fence height in that yard. Retaining walls over a specified height (typically 4 feet from bottom of footing to top of wall) do require a permit.
Detached accessory structures not used for human occupancy, with a floor area of 200 square feet or less, and not more than one story, are generally exempt from building permit requirements in Honolulu.
Edge case: The structure still counts toward lot coverage regardless of permit status. An exempt 200 sq ft shed can push a lot over the coverage maximum. The structure must comply with setback requirements for the district even if no permit is required.
Platforms, walks, and driveways not more than 30 inches above grade and not over any basement or story below are generally exempt from permit requirements.
Edge case: A deck that exceeds 30 inches of height at any point requires a permit. If the deck is attached to the house, it also counts as an addition and must comply with setback rules.
Prefabricated swimming pools accessory to residential occupancy that are less than 24 inches deep and have a capacity of less than 5,000 gallons are typically exempt.
Edge case: In-ground pools and above-ground pools exceeding the depth/capacity thresholds require a permit. Pools also require fencing and barrier compliance under the IBC and local ordinance regardless of permit status.
Replacement of existing equipment with equivalent units — replacing a water heater of the same type and capacity, replacing a split-system AC with an equivalent unit — is typically exempt if it involves no new ductwork, new electrical, or structural changes.
Edge case: Adding a new AC unit to a space that previously had none is not a replacement and may require a permit. Adding new circuits or upgrading the electrical panel always requires an electrical permit.
Work that is never exempt
Regardless of scope or cost, the following categories always require permits in Honolulu:
- New structures for human occupancy. Any new building, dwelling unit, or space intended for human habitation or use requires a building permit.
- Additions to existing structures. Any increase in the footprint, floor area, or height of an existing permitted structure requires a permit.
- Change of occupancy. Changing the use of a space — from storage to habitable, from commercial to residential — requires a permit even if no physical work is done.
- Structural alterations. Any work that affects structural members (footings, columns, beams, bearing walls, roof framing) requires a permit regardless of the overall project value.
- New electrical service and panels. All new electrical service, panel upgrades, and new circuit installations require electrical permits.
- New plumbing. New drain, waste, vent, and supply lines require plumbing permits.
- Solar PV systems. Photovoltaic systems require both electrical and building permits. The structural attachment of racking to the roof is a structural modification.
The unpermitted structure problem
Honolulu has a large stock of older residential properties with unpermitted structures — sheds, carports, covered lanais, and converted garages built before or without permits. These create problems in several scenarios:
- New permit applications. DPP reviews the permit history of a parcel when a new permit is filed. Unpermitted structures on the parcel can block issuance of the new permit until the violation is resolved — either by pulling a permit for the unpermitted work or by removing the structure.
- Resale and financing. Lenders and title companies routinely flag unpermitted structures. A buyer's lender may require permit resolution as a condition of financing.
- Lot coverage calculations. Unpermitted structures count toward lot coverage even though they were never reviewed. A lot that appears to comply with coverage limits may be over the limit when unpermitted structures are included.
- SMA permits. In the Special Management Area, unpermitted work may require a retroactive SMA determination or remediation.
Know what's on the parcel before you design.
Ikena Permit pulls the permit history for your parcel and flags unpermitted structures that could affect your project's lot coverage calculation or block permit issuance — before you submit.
Request early access →Published by Ikena Permit, a DBA of Ikena Design & Build LLC, Honolulu, HI. Informational only. Permit exemption thresholds are subject to change — verify the current exemption list with DPP before proceeding. Last reviewed May 2026.