Flower Mound, TX Fence Regulations: Retaining Walls (2026)

Under Flower Mound building regulations, a permit is required for any retaining wall that exceeds 4 feet in height when measured from the bottom of the footing to the top of the wall. Retaining walls over 4 feet must be designed by a licensed professional engineer and must include stamped construction drawings with the permit application. Walls under 4 feet do not require a permit, but they may not be constructed within recorded easements and must not obstruct natural drainage patterns. Flower Mound sits in the rolling terrain of the Cross Timbers region with significant grade changes in many neighborhoods, making retaining walls common. The town Building Inspections Division at (972) 874-6355 reviews retaining wall permits and conducts inspections. Footing depth is included in the overall height measurement, so a wall that appears to be 3 feet above grade but has a 2-foot footing would exceed the 4-foot threshold and require both a permit and engineering. Retaining walls in the Cross Timbers Conservation Development District may have additional environmental review requirements related to erosion control and drainage.