Saint Paul, MN Fence Regulations: Retaining Walls (2026)
Key Facts
- Permit Threshold
- Over 4 feet tall
- Measurement
- Footing bottom to wall top
- Approved Materials
- Segmental block, CMU, poured concrete
- Engineering Required
- Yes, for walls over 4 feet
Summary
Retaining walls over 4 feet tall in Saint Paul require a building permit and engineered plans. Only segmental block, CMU, or poured concrete walls are generally approved by the city.
Per MN Rules 1300.0120(4): Building permits are required for retaining walls where at any point the wall is taller than 4 feet measured from the base of the footing to the top of the wall. Retaining walls that are 4 feet or shorter measured from the base of the footing to the top of the wall and are not supporting surcharge or impounding Class I, II, or III-A liquids do not require a building permit. No part of the retaining wall may be on or over the property line unless a legal easement agreement has been filed/recorded on both/all properties with Ramsey County.
Full Breakdown
Saint Paul regulates retaining walls through the building code enforced by the Department of Safety and Inspections. Retaining walls that do not exceed 4 feet in height, measured from the bottom of the footing to the top of the wall, are generally exempt from permit requirements unless they support a surcharge or impound Class I, II, or III-A liquids. Walls exceeding 4 feet require a building permit and engineered plans stamped by a licensed professional engineer. The city and Ramsey County generally approve only segmental retaining walls (interlocking block systems) and concrete masonry unit (CMU) or poured concrete walls. Other materials may require special approval. In historic districts, retaining walls of any height require a permit and Heritage Preservation Commission review. Proper drainage behind the wall is required to prevent hydrostatic pressure buildup.
Violations & Fines
Building a retaining wall over 4 feet without a permit can result in a stop-work order, mandatory engineering review, and potential requirement to remove and rebuild the wall. Administrative fines may be assessed for continued noncompliance.
Frequently Asked Questions
Do I need a permit for a retaining wall in Saint Paul?
What materials can I use for a retaining wall?
Sources & Official References
Other rules in Saint Paul
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