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.
ROH 21-4.40 governs retaining wall height and placement across Honolulu including Kailua. Walls containing fill placed within required yard setbacks cannot exceed 6 feet in height. When multiple walls terrace up a slope, their individual heights are added together for measurement when separations are minimal. This matters on sloped Kailua lots near Maunawili or Aikahi. Walls over 30 inches usually require a building permit and stamped engineering drawings per ROH 18-3.1. Drainage provisions, weep holes, and proper footing depth are required to prevent soil saturation failures common in windward rainfall zones.
Non-compliant retaining walls may trigger stop-work orders, forced reconstruction, after-the-fact permit fees, and liability for downhill property damage.
Kailua, HI
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Kailua, HI
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Kailua, HI
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Kailua, HI
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Kailua, HI
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Side-by-side rule comparisons with other cities in Honolulu County.
See how other cities in Honolulu County handle retaining walls.
See how Kailua's retaining walls rules stack up against other locations.
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