ROH Chapter 21 Setbacks: Minimum Yard Requirements by Honolulu Zoning District
Setback violations are the single most common plan-check comment category in Honolulu. Many are not design errors — they are measurement errors: the wrong baseline, the wrong district table, or a misread of the property line location. This is a working reference for how DPP measures setbacks and what the LUO requires by district.
The controlling code: ROH §21-3.50 through §21-3.90
Setback requirements in Honolulu are established by the Land Use Ordinance (LUO), codified as ROH Chapter 21. The setback tables are primarily in Article 3 (District Regulations). When DPP cites a setback comment, the citation will typically reference a specific section within Article 3 — §21-3.50 (front yards), §21-3.60 (rear yards), §21-3.70 (side yards) — along with the applicable district table.
The key document is LUO Table 21-3.4, which sets minimum yard depths by zoning district. That table is the reference that should appear in your general notes and that your plan checker will use to verify the dimensions on your site plan.
How setbacks are measured
Setbacks in Honolulu are measured from the property line — not from the back of curb, not from the right-of-way centerline, not from the face of an existing structure. This is the most common source of measurement errors:
- Right-of-way vs. property line. The street-facing property line and the right-of-way line are often not the same. Where the right-of-way extends beyond the property line, the setback is still measured from the property line. Where a dedication has reduced the effective lot depth, the reduced dimension controls.
- Irregular lots. On lots with curved frontages, angled lot lines, or flag configurations, the LUO provides rules for determining the front, side, and rear yard designations. Verify the lot geometry against the recorded plat before dimensioning the site plan.
- Corner lots. Corner lots have two street frontages. Both frontages require front-yard setbacks (or in some districts, a street-side setback that differs from an interior side setback). The LUO specifies which yard is the front yard when there is ambiguity — generally the shorter street frontage is the side yard.
Setback minimums by district (representative reference)
The values below are representative of the current LUO. Always verify against the adopted text of ROH Chapter 21 for the specific zoning district and any recorded conditions of approval that may impose greater setbacks on a particular parcel.
| District | Front yard | Side yard | Rear yard | Notes |
|---|---|---|---|---|
| R-3.5 | 10′ | 3′ (corner: 10′) | 10′ | Most restrictive residential lot size (3,500 sq ft min) |
| R-5 | 10′ | 3′ (corner: 10′) | 10′ | Standard urban residential |
| R-7.5 | 15′ | 5′ (corner: 12′) | 15′ | Suburban single-family |
| R-10 | 20′ | 5′ (corner: 15′) | 20′ | |
| R-20 | 25′ | 7.5′ (corner: 20′) | 25′ | Estate residential |
| BMX-3 | 0′ (or match adjacent) | 0′ | 0′ | Business mixed-use, urban form |
| A-1 | 15′ | 5′ (corner: 10′) | 15′ | Low-density apartment |
| A-2 | 10′ | 5′ (corner: 10′) | 10′ | Medium-density apartment |
What counts as a structure for setback purposes
The LUO defines which elements of a project must comply with yard setbacks. The rules are more nuanced than "buildings must be set back":
- Accessory structures (detached garages, storage sheds, accessory dwelling units) must comply with setbacks, though in some districts they may qualify for reduced rear and side yard setbacks when located in the rear yard area.
- Covered open structures (lanai covers, carport canopies) must comply with setbacks. The fact that a structure is open on the sides does not exempt it from the yard requirement.
- Eaves and overhangs may encroach into required yards by up to 2 feet under most district rules, provided the overhang does not extend closer than 3 feet to a property line. Verify the current LUO section — this allowance has specific conditions.
- Fences and walls within required yards are subject to height limits (typically 3.5 feet in front yards, 6 feet in rear and side yards) but not setback requirements.
Nonconforming lots and the averaging rule
Lots created before the current LUO that do not meet minimum lot dimensions may be classified as nonconforming. A nonconforming lot does not automatically receive a variance — the structure built on it must still comply with the setbacks for the district.
One exception is the prevailing setback rule: if the majority of developed lots on the same block face have a front-yard setback less than the LUO minimum, the front yard for a new structure may be reduced to match the prevailing setback — but not less than 5 feet. This rule is specific to front yards and requires documentation of the prevailing condition.
How to document setbacks on your plans
DPP plan checkers look for specific information on the site plan to verify setback compliance:
- Property line dimensions and bearings matching the recorded plat
- All proposed structures dimensioned to all property lines (not just the closest one)
- Zoning district identified in the general notes or title block
- LUO Table 21-3.4 minimums cited in the general notes
- Existing structures shown on the site plan, dimensioned to property lines
- Right-of-way width and location identified if different from property line
Catch setback violations before DPP does.
Ikena Permit checks your plan set against ROH §21 setback requirements for your specific zoning district — parcel-aware, citation-anchored, in about 30 minutes.
Request early access →Published by Ikena Permit, a DBA of Ikena Design & Build LLC, Honolulu, HI. Informational only — verify all setback requirements against the current adopted text of ROH Chapter 21 for the specific zoning district. Last reviewed May 2026.