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.
ROH/LUO Sec. 21-4.40 governs retaining walls throughout Waipahu. Walls containing fill within a required yard cap at 6 feet, and terraced walls are measured as combined height when horizontal separation is narrow. Waipahu Stream and Kapakahi Stream corridors bring drainage-sensitive retaining walls along rear yards, and DPP coordinates 21-4.40 review with Chapter 14 grading and drainage rules. On the edge hillsides toward Waipio Gentry, walls above the 30-inch building permit threshold require engineered drawings and geotechnical review. Legacy plantation-era rock walls are often grandfathered but must be replaced to current standards when substantially altered. Drainage failures toward downstream neighbors are a frequent enforcement trigger.
Oversized or unpermitted retaining walls can trigger DPP stop-work orders, required rebuilds, doubled after-the-fact permit fees, and lien-eligible abatement costs.
Waipahu, HI
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Waipahu, HI
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Waipahu, HI
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