Retaining walls 4 feet or taller in Prior Lake require a building permit and engineered design under the Minnesota State Building Code adopted by City Code Chapter 3.
Under the State Building Code, retaining walls measuring 4 feet or more from the bottom of the footing to the top require a building permit and, in most cases, a Minnesota-licensed engineer's stamped design. Walls within or near the shoreland district (1,000 feet of Prior Lake or Spring Lake) are subject to additional shoreland and grading review. Walls supporting a surcharge load (a driveway, structure, or large tree above) require engineering regardless of height. Permits are obtained through the Prior Lake Building Inspections Department; expect plan review and inspections at footing, drainage, and final.
Constructing a retaining wall over 4 feet without a permit is a misdemeanor with fines up to $1,000 and double after-the-fact permit fees. Unsafe walls can be ordered demolished at owner expense.
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