Retaining Walls: Apex vs Cary
How do retaining walls rules compare between Apex, NC and Cary, NC?
Apex has fewer restrictions than Cary.
Apex, NC
Wake County
Apex regulates retaining structures under UDO Sec. 8.1.6 (Retaining Structures) and treats freestanding walls under Sec. 8.2.7 (Fences, Walls, and Berms). Retaining-wall construction is also subject to the North Carolina State Building Code (NC Residential Code R404 for foundation/retaining walls; NC Building Code Chapter 18 for non-residential), enforced by the Apex Building Inspections Division at (919) 249-3418. The UDO's 7-foot freestanding-wall cap (Sec. 8.2.7.B.1) does not apply to grade-retaining walls, but retaining walls 4 feet or taller (measured bottom of footing to top of wall) typically require engineered design and a building permit under the NC State Building Code.
View full Apex rules →Cary, NC
Wake County
North Carolina building code requires permits and engineering review for retaining walls over four feet in height.
View full Cary rules →Key Facts Comparison
| Fact | Apex | Cary |
|---|---|---|
| Freestanding Wall Cap | 7 feet, including piers/posts/finials (Sec. 8.2.7.B.1) | - |
| Front Yard Wall Cap | 48 inches (Sec. 8.2.7.B.2) | - |
| Engineered Retaining Wall Threshold | Over 48 inches unbalanced backfill - NC Residential Code R404 | - |
| State Code Authority | NC State Building Code (NCGS Ch. 143, Art. 9) | - |
| State Preemption | Session Law 2023-108 (HB 488) reorganized NC Code Councils | - |
| Apex Building Inspections | (919) 249-3418 - 322 N Mason St, Apex NC 27502 | - |
| Rights-of-Way | Retaining walls not permitted in public ROW | - |
| Easements | Walls in recorded easements must be removed | - |
| Permit threshold | - | Over 4 feet tall |
| Engineer required | - | N.C.G.S. 89C |
| Erosion law | - | N.C.G.S. 113A-50 |
| Code authority | - | N.C.G.S. 143-138 |
Highlighted rows indicate differences between cities.
Apex FAQ
Do I need a permit to build a retaining wall in Apex?
Yes for any retaining wall over 4 feet (measured bottom of footing to top of wall) or supporting a surcharge, under the NC State Building Code R404, enforced by Apex Building Inspections at (919) 249-3418. Shorter landscape walls still must comply with UDO Sec. 8.2.7 height and material standards.
How tall can a freestanding wall be in Apex?
Up to 7 feet, including piers, posts, and finials, per UDO Sec. 8.2.7.B.1. Walls in front yards may not exceed 48 inches per Sec. 8.2.7.B.2. Taller non-residential walls require Planning Director approval.
Does Apex enforce its own retaining wall code?
Apex Building Inspections enforces the North Carolina State Building Code, including the residential R404 retaining-wall provisions and the NC Building Code Chapter 18. Following Session Law 2023-108 (HB 488), local amendments to the residential code are limited.
Cary FAQ
Do I need an engineer for a retaining wall in North Carolina?
Yes for walls over four feet or those supporting surcharge loads. N.C.G.S. 89C requires sealed plans from a licensed professional engineer for these structural retaining walls.
What erosion control rules apply to NC retaining walls?
Construction disturbing one or more acres triggers Sedimentation Pollution Control Act requirements under N.C.G.S. 113A-50, including approved erosion plans and inspection by NC DEQ.
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