Sumter County, FL Fence Regulations: Retaining Walls (2026)

The Sumter County Code does not contain a general height, setback, or engineering standard for retaining walls outside the floodplain articles. Where the code does speak to retaining walls is Sec. 13-1116(c), which places retaining walls, sidewalks, and driveways that involve placing fill inside a regulated floodway under the same limitation as other floodway development. That limitation, set out in Sec. 13-1112(d), bars any development, including site improvements and land-disturbing activity involving fill or regrading, from being authorized in a regulatory floodway unless a floodway encroachment analysis required under Sec.

13-1105(c)(1) demonstrates the work will not cause any increase in the base flood elevation. In practice, a homeowner or contractor proposing a retaining wall inside a mapped regulatory floodway in unincorporated Sumter County must submit that encroachment analysis, sealed by a Florida licensed engineer, before the floodplain administrator, the director of Development Services, can issue a floodplain development permit for the wall. That analysis is filed with the site plan and construction documents required under Sec. 13-1105, and the floodplain administrator may request additional hydrologic or hydraulic data before acting on the permit.

Retaining walls located outside a regulated floodway are not addressed by this provision and fall instead under the county's general building and land development permitting requirements, which this section does not itself set a numeric standard for.