Retaining walls fall under each city's wall and fence standards. In Fishers, walls may sit along a property line but not in the public right-of-way or protected easements. A structural retaining wall may need a building permit under the Indiana Residential Code.
Hamilton County cities regulate retaining walls through their zoning ordinances, not the county. The Fishers UDO (Sec. 6.18.2) treats walls with fences: a wall may be built directly along a property line but may not encroach into the public right-of-way or into drainage and utility easements. Height and placement standards mirror the fence rules for the district. Separately, a taller structural retaining wall is a building-code matter: under Indiana's adopted residential code (675 IAC / IRC), a retaining wall supporting a surcharge or exceeding the code threshold typically requires an engineered design and a building permit. Check with your city's planning and building divisions before construction, and keep the wall clear of drainage easements.
A wall in the right-of-way or a protected easement, or a structural wall built without a required permit, is a violation subject to correction or removal.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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