Retaining Walls: Kaneohe vs Waipahu
How do retaining walls rules compare between Kaneohe, HI and Waipahu, HI?
Kaneohe and Waipahu have similar restriction levels.
Kaneohe, HI
Honolulu County
Kaneohe's rolling terrain makes ROH Sec. 21-4.40 retaining wall rules especially relevant. Fill-retention walls in required yards cannot exceed 6 feet, and terraced walls are combined for height calculation.
View full Kaneohe rules →Waipahu, HI
Honolulu County
Waipahu retaining walls fall under ROH 21-4.40, capping fill-bearing walls in required yards at 6 feet with terraced heights combined, impacting stream-side and hillside plantation lots.
View full Waipahu rules →Key Facts Comparison
| Fact | Kaneohe | Waipahu |
|---|---|---|
| - | - | |
| Yard max height | - | 6 feet |
| Terraced rule | - | Heights combined |
| Code section | - | ROH 21-4.40 |
| Drainage overlay | - | Chapter 14 |
Highlighted rows indicate differences between cities.
Kaneohe FAQ
My lot drops 10 feet to the neighbor. Can I build one tall wall?
Not a single wall in a required yard; you would need terraced walls with drainage, stamped engineering, and permits.
Are rock-and-riprap walls treated differently?
Riprap walls up to 30 inches are permit-exempt, but larger or engineered rip rap typically needs permits and drainage design.
Waipahu FAQ
How tall can a Waipahu retaining wall be?
Walls with fill in a required yard cap at 6 feet under ROH 21-4.40. Terraced walls are measured as combined height. Engineering review is required above the 30-inch permit threshold for taller installations.
Do old rock walls still comply?
Many legacy plantation-era rock walls are grandfathered. However, substantial alteration, repair, or replacement triggers current ROH 21-4.40 standards and may require engineered drawings plus drainage review.
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