Retaining Walls: Ewa Gentry vs Mililani Mauka
How do retaining walls rules compare between Ewa Gentry, HI and Mililani Mauka, HI?
Ewa Gentry and Mililani Mauka 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 →Mililani Mauka, HI
Honolulu County
ROH Sec. 21-4.40 limits fill-retaining walls in Mililani Mauka yards to six feet and combines terraced wall heights, important on the community's sloped Central Oahu grades.
View full Mililani Mauka rules →Key Facts Comparison
| Fact | Ewa Gentry | Mililani Mauka |
|---|---|---|
| - | - |
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.
Mililani Mauka FAQ
Can I build a three-tier terrace instead of one tall wall?
Terraced walls are measured together under ROH 21-4.40, so stacking tiers does not sidestep the six-foot limit.
Must retaining wall finishes be approved by MTA?
Yes. Walls visible from the street typically require MTA approval for color and finish.
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