Honolulu County, HI Building Setbacks & Zoning: Structure Height Limits (2026)
Key Facts
- Height range
- 25 to 30 feet
- Districts covered
- R-3.5 through R-20
- Height setback trigger
- Over 15 ft side/rear
- Front setback trigger
- Over 20 feet
- Governing table
- ROH Table 21-3.2
Summary
Houses in Honolulu's residential zoning districts, R-3.5 through R-20, must fit inside a building envelope that tops out between 25 and 30 feet, formed by the intersection of two planes, with additional height setbacks once a structure passes 15 feet at the side and rear lines or 20 feet at the front.
(1) Maximum height. The maximum height of structures is determined by the building envelope created as the result of the intersection of two planes. The first plane is measured horizontally across the parcel at 25 feet above the high point of the buildable area boundary line. The second plane runs parallel to grade, as described in § 21-4.60(b), measured at a height of 30 feet.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-10: Supplement 10, 12-2025 Ordinance No. 25-40 through Ordinance No. 25-56).
Full Breakdown
70-1(c)(1) explains how the envelope is drawn. The first plane is measured horizontally across the parcel at 25 feet above the high point of the buildable area boundary line. 60(b), measured at a height of 30 feet. The building envelope is created where those two planes intersect, which is why the practical ceiling lands between 25 and 30 feet depending on how the lot's grade runs. On a lot where the planes never meet, the lower 25-foot plane controls by itself. 70-1(c)(2): any part of a structure taller than 15 feet must step back farther from the side and rear boundary lines, and any part taller than 20 feet must step back from the front boundary, at a rate of 1 foot of additional setback for every 2 feet of height.
The combined effect is that upper stories of a Honolulu house pull inward from the property lines even when the ground floor sits at the ordinary yard line.
Violations & Fines
Building above the envelope or skipping the required 1-foot-per-2-feet height setback without an approved adjustment violates § 21-2.150 and can draw the chapter's fines.
Frequently Asked Questions
How tall can a house be in Honolulu?
Do taller homes need extra setbacks?
What if the two height planes never intersect on my lot?
Sources & Official References
Other rules in Honolulu County
Compare Honolulu County to another location·View the Hawaii building setbacks & zoning overview
See something wrong?
Help us keep this page accurate. If you notice an error or outdated information, let us know.