Retaining Walls: Ewa Gentry vs Kailua
How do retaining walls rules compare between Ewa Gentry, HI and Kailua, HI?
Ewa Gentry and Kailua have similar restriction levels.
Ewa Gentry, HI
Honolulu County
ROH Sec. 21-4.40 controls retaining walls in Ewa Gentry, limiting fill-containing walls inside required yards to six feet and combining terraced wall heights for measurement.
View full Ewa Gentry rules →Kailua, HI
Honolulu County
Retaining walls in Kailua follow ROH Sec. 21-4.40, which caps fill-retention walls within required yards at 6 feet. Terraced walls count toward combined height totals, and most walls over 30 inches require engineering.
View full Kailua rules →Key Facts Comparison
| Fact | Ewa Gentry | Kailua |
|---|---|---|
| - | - |
Highlighted rows indicate differences between cities.
Ewa Gentry FAQ
Can I build two stacked retaining walls to exceed the height limit?
No. ROH 21-4.40 combines terraced wall heights so stacking does not bypass the six-foot limit in required yards.
Do I need an engineer for a rear-yard retaining wall?
Most fill-retaining walls above the short-wall exemption require engineered drawings and a DPP permit.
Kailua FAQ
Can I build a 5-foot retaining wall in my side yard?
Yes, up to 6 feet within required yards under ROH 21-4.40, but you will likely need a permit and engineering over 30 inches.
What about two stacked 4-foot walls?
Terraced walls are typically measured together, so two closely spaced 4-foot walls may be treated as an 8-foot wall exceeding the cap.
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