Waukesha County, WI Fence Regulations: Retaining Walls (2026)
Key Facts
- Defined as wall over
- 18 inches from grade
- 5 ft+ from lot line
- Minor Grading zoning permit
- Under 5 ft from line
- Plan Commission approval
- Shoreland setback
- 75 ft from high water mark
- Agreement required
- Yes, drainage/aesthetics
Summary
Waukesha County regulates retaining walls as Structures. A wall five feet or greater from a lot line generally needs a Minor Grading zoning permit and an owner agreement; a wall closer than five feet to a lot line needs specific Plan Commission and County Zoning Agency authorization. Near water, walls
A Retaining Wall five (5) feet or greater from a property line, may be allowed pursuant to issuance of a Zoning Permit (Minor Grading Permit) and an agreement being made between the owner and the Town Planning Commission and the County Zoning Administrator.
Official source re-checked September 8, 2026: the cited page had not changed since it was quoted.
Full Breakdown
The Basic Zoning Ordinance defines a Retaining Wall as a structure more than 18 inches high from grade. A wall five feet or more from the property line may be allowed by a Zoning Permit (Minor Grading Permit) with an owner agreement addressing drainage and intent. A wall less than five feet from a property line requires specific authorization by the Plan Commission and County Zoning Agency plus a signed agreement so drainage and neighboring aesthetics are protected. In shoreland areas the Shoreland Ordinance requires all retaining walls to be set back at least 75 feet from the ordinary high water mark.
Violations & Fines
Unauthorized retaining-wall grading is a zoning violation subject to stop-work orders, restoration requirements, and forfeitures assessed by the Zoning Administrator.
Frequently Asked Questions
Do I need a permit for a retaining wall?
Can I build a retaining wall near a lake?
Sources & Official References
Other rules in Waukesha County
Compare Waukesha County to another location·View the Wisconsin fence regulations overview
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