Fayette County, GA Fence Regulations: Retaining Walls (2026)

Fayette County's residential building permit exemptions, codified at Code § 102-487(1)e, single out retaining walls for their own height threshold. A retaining wall is defined as a structure made of masonry, concrete, timber or similar material used to retain earth, water or other lateral pressure; the code specifically carves out cast-in-place walls that are part of a home's original foundation and retain earth or water, saying those don't count as retaining walls for this exemption. A retaining wall that is four feet or less in height, measured from grade to the top of the wall, does not need a residential building permit, but that exemption disappears the moment the wall supports a surcharge, meaning it holds back an additional load such as a driveway, structure or sloped fill above the retained earth.

The same section sets a length-to-height ratio for stacked or terraced retaining walls: a maximum 1:1 ratio, meaning the wall's length can't outrun its height without a change, except where the wall ends at a 45-degree angle, in which case a 1.5:1 ratio is allowed. Every permit-exempt wall still has to comply with Code chapter 110, zoning, and can still trigger separate electrical or drainage permits if the project needs them. The equivalent building-code provision for other structures, Code § 102-193(1)d, sets the same four-foot line, but adds that a wall impounding Class I, II or IIIA liquids loses the exemption even under four feet.