R-20 Zone in Honolulu, HI
R-20 zoning district rules in Honolulu, HI. Permitted uses, setbacks, height limits, and lot coverage requirements.
The R-20 zone in Honolulu, HI is a residential district (Two-Family Residential). Permits up to two dwelling units per lot (duplex). Allows slightly higher density than R-1 while maintaining low-density neighborhood character. This zone requires a 30 ft front setback, 15 ft side setback, and 25 ft rear setback. Maximum building height is 35 feet (2 stories). Maximum lot coverage is 30%.
Common Permitted Uses
- Single-family homes
- Duplexes
Permits up to two dwelling units per lot (duplex). Allows slightly higher density than R-1 while maintaining low-density neighborhood character.
Setback Requirements
| Setback Type | Requirement |
|---|---|
| Front Setback | 30 feet |
| Side Setback | 15 feet |
| Rear Setback | 25 feet |
Honolulu LUO R-20 (Single-Family Residential, 20,000 sqft minimum lot) — estate/rural residential. Large setbacks. Found in Kahala, Hawaii Kai, and upper valley areas.
Height Limits
- Max Height
- 35 feet
- Max Stories
- 2
Honolulu LUO R-20 — 35 ft height limit for estate lots.
Lot Coverage
- Max Coverage
- 30%
Honolulu LUO R-20 — 30% lot coverage for large estate lots.
Parking Requirements
Single-family: 2 spaces per single-family dwelling. Covered parking (carport or garage) strongly preferred in Hawaii due to sun and weather. Multi-family: 1–1.5 spaces per unit depending on bedroom count and proximity to Skyline rail transit. Reduced requirements near rail stations.
Source: Revised Ordinances of Honolulu Chapter 21 (Land Use Ordinance); Hawaii Revised Statutes Section 46-4.5 (Act 232, 2023). Last verified April 6, 2026. View source