Retaining Walls: Kaneohe vs Mililani Town
How do retaining walls rules compare between Kaneohe, HI and Mililani Town, HI?
Kaneohe and Mililani Town 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 →Mililani Town, HI
Honolulu County
Mililani Town retaining walls follow ROH Sec. 21-4.40 rules and HOA review. Fill-retaining walls in required yards cannot exceed 6 feet, and terraced walls are measured in combination.
View full Mililani Town rules →Key Facts Comparison
| Fact | Kaneohe | Mililani Town |
|---|---|---|
| - | - |
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.
Mililani Town FAQ
Do planter walls count as retaining walls?
If they hold back soil, yes; decorative low planters that don't retain earth are typically not regulated under 21-4.40.
Is HOA approval needed for a 24-inch garden wall?
Usually yes. Even ROH-exempt walls typically still need HOA architectural review in Mililani before construction.
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