Retaining walls are regulated by your city, not Anoka County. In Coon Rapids a building permit (and possibly a variance) is required for any retaining wall 4 feet or more in height measured from the footing, and walls are barred from drainage and utility easements.
Retaining-wall requirements are set at the city level in Anoka County under Minn. Stat. §462.357. In Coon Rapids, a building permit is needed for any retaining wall four feet or more in height, measured from the footing; shorter walls need no permit but must still meet zoning and building standards. Unlike fences, walls are not allowed within drainage and utility easements, and no wall may obstruct free access to a fire hydrant. Taller engineered walls typically require structural plans. Check your own city's building division, as thresholds can vary slightly.
A wall 4 feet or taller built without a permit can be red-tagged for engineering review or removal; walls placed in a drainage/utility easement may be removed by the city or utility without compensation.
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See how Coon Rapids's retaining walls rules stack up against other locations.
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