Kane County treats retaining walls as structures reviewed by the Building & Zoning Division. Walls affecting drainage or located in easements or floodplains require Water Resources review, and engineered plans are typically needed for taller walls. Confirm thresholds with the Building & Zoning Division.
Kane County does not publish a standalone residential retaining-wall height table in its online building packets; retaining walls are handled as structures through the Building & Zoning Division and, where they affect grading or stormwater, through Water Resources. Because the county's accessory-structure and fence rules require plats of survey showing easements and drainage, and prohibit obstructions in drainage easements and the floodway, retaining walls in those areas face the same review. Engineered/sealed plans are generally required for taller or load-bearing walls. Applicants should confirm the current permit threshold and required drawings directly with the Building & Zoning Division before construction.
Building a regulated retaining wall without required permits or in a drainage easement or floodway can trigger a stop-work order, correction notice, or removal by the county.
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See how Kane County's retaining walls rules stack up against other locations.
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