Retaining Walls: Flower Mound vs Lewisville
How do retaining walls rules compare between Flower Mound, TX and Lewisville, TX?
Flower Mound and Lewisville have similar restriction levels.
Flower Mound, TX
Denton County
Flower Mound requires a building permit for any retaining wall over 4 feet tall including footing depth. Walls exceeding 4 feet must be designed by a licensed professional engineer. Retaining walls under 4 feet do not need a permit but cannot be built in easements or block drainage.
View full Flower Mound rules →Lewisville, TX
Denton County
Lewisville requires a building permit for retaining walls exceeding 4 feet in height measured from the bottom of the footing to the top of the wall. Engineered plans are required for taller walls. Retaining walls near Lewisville Lake floodplain areas face additional review.
View full Lewisville rules →Key Facts Comparison
| Fact | Flower Mound | Lewisville |
|---|---|---|
| Permit Threshold | Over 4 ft including footing depth | Over 4 ft requires permit |
| Engineer Required | Walls over 4 ft must have PE design | - |
| Under 4 ft | No permit; cannot block drainage/easements | - |
| Height Measurement | Bottom of footing to top of wall | - |
| Contact | Building Inspections (972) 874-6355 | - |
| Engineering | - | Licensed PE plans required over 4 ft |
| Floodplain | - | Additional review near lake and creeks |
| Combined Height | - | Wall + fence measured together for zoning |
| Surcharge Loads | - | Engineering may be required at any height |
Highlighted rows indicate differences between cities.
Flower Mound FAQ
Do I need a permit for a retaining wall in Flower Mound?
Only if the wall exceeds 4 feet in total height including the footing depth. Walls under 4 feet do not require a permit, but they cannot be built in easements and must not block drainage.
Do I need an engineer to design my retaining wall?
Yes, if the total height (including footing) exceeds 4 feet. You must submit stamped engineering drawings with your permit application. Walls under 4 feet do not require engineering.
Lewisville FAQ
Do I need a permit for a retaining wall in Lewisville?
Yes, if the wall exceeds 4 feet in height from the bottom of the footing to the top. Walls over 4 feet also require stamped plans from a licensed Texas Professional Engineer.
Can I put a fence on top of my retaining wall?
Yes, but the combined height of the retaining wall plus the fence is measured together for compliance with zoning fence height limits. The total may not exceed the maximum allowed fence height for your yard location.
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