Plymouth, MN Building Setbacks & Zoning: Lot Coverage Limits (2026)

04, Subd. 4(a) of the Plymouth Zoning Ordinance sets the impervious surface cap for every lot inside the Shoreland Management Overlay District: no more than 25 percent of the portion of the lot lying above the ordinary high water level may be covered by driveways, buildings, patios, or other impervious surface. 03. 11, Subd. 2(c) and Subd. 3(c), so a substandard shoreland lot cannot exceed the cap even when it qualifies for a building-site exception to normal lot-size rules. Beyond the numeric cap, Subd. 4(b) requires stormwater from any shoreland lot to drain by methods the City Engineer approves that maximize use of natural drainageways, wetlands, and vegetated soils to convey, store, filter, and retain water before it reaches a public water, and outfall structures must filter and settle solids and skim debris before discharge.

Maximum structure height in the overlay is capped separately at 45 feet by Subd. 3, and the 25 percent impervious limit stacks on top of the setback table in Subd. 2 rather than replacing it. Because this cap sits inside the shoreland overlay rather than the base zoning code, it binds shoreland parcels in addition to whatever coverage standard applies in the underlying RSF, RMF, or commercial district; lots entirely outside the mapped shoreland area follow the underlying district's own standards in Sections 21350-21650 instead.