Carmel's UDO lists retaining walls as an accessory use permitted in any required front, side, or rear yard (Section 5.02(C)(1)) and sets no height ceiling for them. Structural permitting for retaining walls is handled under the Carmel/Indiana building code rather than the zoning fence standards.
Carmel's UDO does not impose a fence-style height limit on retaining walls. Section 5.02(C)(1) (AB-01: Residential Accessory Building and Use Standards) expressly states that 'Accessory Uses such as public utility installations, private walks, driveways, retaining walls, mail boxes, nameplates, lamp posts, birdbaths and structures of a like nature are permitted in any required Front, Side or Rear Yard.' Because a retaining wall is treated as a permitted accessory use, it is regulated for grading and drainage rather than for height under the fence rules: UDO Section 5.13 (GD-01) requires that grading, filling, or excavating 'shall not be detrimental to surrounding properties in appearance or in the diversion of storm water,' and prohibits obstructing natural drainage. Structural review and permitting of a retaining wall fall under Carmel City Code Chapter 7 (Building Code), which incorporates the Indiana building code; under the Indiana Residential Code (IRC), retaining walls supporting a surcharge or exceeding the code-exempt height generally require an engineered permit. Note that if a fence is placed on top of a retaining wall or berm, the fence height is measured from the ground adjacent to the wall/berm (UDO 5.09(E)), so a wall plus fence can affect compliance.
A retaining wall that diverts stormwater onto neighbors or obstructs natural drainage violates UDO Section 5.13 (Grading and Drainage) and can trigger a notice of violation and required corrective grading. Building a structural retaining wall that requires a permit without obtaining one is a building-code violation under Chapter 7, which can lead to a stop-work order, after-the-fact permitting, or removal. A fence mounted on a wall that pushes total height over the UDO 5.09 limit is also enforceable.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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Carmel City Code § 6-88 (Removal of Weeds, Debris, and Other Such Rank Vegetation) requires owners to remove weeds and rank vegetation over six inches averag...
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