A retaining wall over four feet tall, measured from the bottom of the footing, needs a building permit and engineered design under the Michigan Residential Code. Shorter unloaded walls are usually exempt, but drainage and setbacks still apply.
Retaining walls in Saginaw County follow the Michigan Residential Code, enforced by city and township building departments. A wall four feet or less from the bottom of the footing to the top, carrying no surcharge such as a driveway or slope above it, generally needs no building permit. A taller wall, or any wall holding back a surcharge, requires a permit and usually a licensed engineer's stamped design. Setbacks from the property line still apply, drainage behind the wall must be handled, and a wall that pushes stormwater onto a neighbor's land can create civil liability.
Building a regulated wall over four feet without a permit draws a stop-work order, required engineering review, and fines, and the wall can be ordered corrected or removed.
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See how Saginaw County's retaining walls rules stack up against other locations.
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