Wauwatosa, WI Fence Regulations: Retaining Walls (2026)

Wauwatosa's exterior property maintenance chapter treats retaining walls as part of a property's ongoing upkeep obligations, not just a construction detail. Municipal Code Section 15.32.030, the Exterior Property Requirements section, states under its Retaining Walls subsection that any retaining wall abutting public property must be kept structurally sound and must not be built or maintained so that it repeatedly sends mud, gravel or debris onto a public sidewalk, street or alley. The rule sits next to the code's Erosion and Soil Runoff standard in the same section, which requires an owner to correct soil erosion that spills onto public rights-of-way through regrading, sodding or planting ground cover, showing the city treats drainage control and retaining-wall soundness as connected problems.

A separate permitting layer applies when the wall sits on city property. Chapter 12.42, Encroachments, bars anyone from encroaching on city land, a right-of-way or an easement without common council authorization. Section 12.42.020 requires an application to the Board of Public Works describing the proposed encroachment, and a nonrefundable fee set by the city's fee schedule must be paid to the city treasurer specifically when applying for an encroachment involving a retaining wall or a structure needing a building permit. The board can waive that fee only for unusual or extraordinary circumstances, and any approved encroachment must be documented in a recorded agreement drafted by the city attorney and approved by the common council under Section 12.42.030.

Failure to maintain a retaining wall as required under Chapter 15.32 exposes the owner to the chapter's general enforcement track: an inspection-triggered order to correct under Section 15.32.060, a fifteen-day appeal right to the Board of Public Works, and citation authority under Section 15.32.070 tied to the code's general penalty provisions and Wisconsin Statutes Chapter 800.