Chattanooga zoning regulates retaining walls through the Building Code rather than the zoning ordinance. A structural retaining wall typically needs a building permit and engineering, especially above modest heights, and cannot sit inside a utility easement without approval.
Chattanooga City Code Sec. 38-51(d)(3) states that retaining walls are regulated by the Building Code, so height, design, and permitting are handled through the adopted building code and its engineering thresholds rather than a fixed zoning number. Separately, Sec. 38-46 prohibits permanent structures, including retaining walls, within utility easements unless the authorizing agency approves, and neither the City nor utility is responsible for replacing a wall damaged during utility repair. In unincorporated Hamilton County, retaining walls fall under the county Building Inspection and Zoning Regulations; check permit thresholds with County Development Services before construction.
Building a retaining wall without a required building permit, or within a utility easement without approval, can bring stop-work orders, correction notices, and uncompensated removal if utility access is needed.
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