Blaine, MN Fence Regulations: Retaining Walls (2026)

Blaine follows the Minnesota State Building Code for retaining walls, summarized on the City's When is a Permit Required page. A retaining wall is exempt from a building permit when it is not over four feet in height, measured from the bottom of the footing to the top of the wall, and is not supporting a surcharge. A surcharge includes added loads such as buildings, pools, parking areas, streets, alleys, sidewalks, or other loads above the wall. Any retaining wall over four feet in height, and any wall of any height supporting a surcharge, requires a permit. Even for walls under four feet, the City suggests a site plan review because zoning rules, drainage, and easements still apply. Retaining walls within drainage or utility easements must not impede the easement and may be subject to removal. The permit and engineering thresholds derive from Minnesota Rules part 1300.0120 and the state building code rather than a Blaine-specific height rule; engineered design is generally required for taller walls and for walls supporting a surcharge. Owners should contact a Blaine Building Inspector at 763-785-6177 to confirm requirements for a specific wall.