Janesville, WI Environmental Rules: Boat Dock Permits (2026)

The City of Janesville regulates waterfront construction through the Shoreland-Wetland Overlay District created by Article XV of Chapter 42, not through a dedicated dock or boathouse permit chapter. Sec. 42-520(a) pulls any wetland five acres or larger, or land within 300 feet of the ordinary high water mark of a navigable river such as the Rock River, into the overlay. Within that overlay, Sec. 42-521(a) lists the permitted uses that may proceed without a conditional use permit, and item (7) specifically names the construction and maintenance of piers and docks built on pilings.

Because docks and piers sit on the permitted-use list rather than the conditional-use list in Sec. 42-521(b), Sec. 42-522(b), which requires a City building permit only for construction of conditional uses listed in Section 42-521(b), does not by its own terms reach an ordinary residential dock. The Shoreland-Wetland article still layers on Wis. Stats. chs. 30 and 31, so a waterway structure remains subject to whatever the Wisconsin DNR requires for placement in navigable water; the City's own code simply does not add a separate municipal dock permit on top of that.

A property owner planning an enclosed boathouse rather than an open dock should note Sec. 42-132's separate boathouse definition, since an enclosed, roofed structure can draw different building code review than an open pier.