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.
Mililani Mauka's elevated perch above Mililani proper creates real retaining-wall demands, and ROH 21-4.40 is the controlling standard. Walls containing fill inside required yards cannot exceed six feet, and terraced walls are summed for height measurement to prevent stacking shortcuts. Engineered designs and permits are typical, particularly where walls support rear-yard pads or driveways. Mililani's expansive clay soils and periodic heavy rain events make drainage design essential. MTA architectural review also applies, and walls visible from the street must meet finish and color requirements.
Orders to reduce or remove walls, fines, civil liability for drainage damage, and HOA sanctions.
Mililani Mauka, HI
ROH Sec. 18-3.1 sets the city permit thresholds for Mililani Mauka fences and walls, with narrow exemptions for retaining and riprap walls under 30 inches.
Mililani Mauka, HI
ROH Sec. 21-3.70-1 imposes impervious-surface caps on Mililani Mauka lots, including a 75 percent impervious limit for dwellings permitted after May 1, 2019.
Mililani Mauka, HI
ROH Sec. 21-4.30 sets the baseline yard and street setbacks for Mililani Mauka, with 21-3.70-1 supplying district-specific minimums for the community's resid...
Side-by-side rule comparisons with other cities in Honolulu County.
See how other cities in Honolulu County handle retaining walls.
See how Mililani Mauka's retaining walls rules stack up against other locations.
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