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Wilmington, DE Fence Regulations: Retaining Walls (2026)

Some Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Exempt height
under 1 foot
Governing chapter
City Code ch. 48, Zoning
R-1 setback line
30 feet from street
Fence/railing exemption
under 4 ft, <25% solid

Summary

In Wilmington's zoning code, a retaining wall under one foot tall is exempt from the residential building setback line; anything taller has to sit behind that line like the house itself.

Same—Certain steps, retaining walls, fences and railings. The provisions of this section shall not apply to any step or retaining wall which is less than one foot high above the ground or to any fence or railing which is less than one-fourth solid and less than four feet above the ground.(f)Corner lots. In the case of a corner lot, the building setback line along the side street shall be determined by the side yard requirements on a corner lot as established by section 48-156.(g)Fire escapes. No fire escape shall be permitted to be located on, along, or attached to any side of any building or structure that faces the right-of-way along any street line; provided, that a fire escape may be so located and face the right-of-way along a street line if such placement has been determined to be necessary for use by the occupants of the building or structure in an emergency and has been specifically approved for the same by the commissioner of licenses and inspections. (Code 1968, § 48-17; Ord. No. 92-028, § 1, 6-4-92)

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 72).

Full Breakdown

Wilmington City Code § 48-154 sets the building setback line for each residential zoning district (30 feet in R-1, 25 feet in R-2/R-2-A, 15 feet in R-3/R-4/R-5-B/R-5-C, for example). Subsection (e) carves out a narrow exemption: short steps and retaining walls under one foot high, and fences or railings under four feet that are less than one-fourth solid, don't have to observe that line. A taller retaining wall does, it counts as a structure subject to the setback, so it can't project into the required front, side, or rear yard the way a taller fence generally can't either.

Violations & Fines

Zoning administrator or Department of Licenses and Inspections enforcement; a wall built into the setback without qualifying for the exemption is a zoning violation subject to a stop-work order or removal.

Frequently Asked Questions

Do I need a permit for a 3-foot retaining wall in Wilmington?
The code doesn't exempt it from the zoning setback line the way sub-1-foot walls are exempted, so check placement against § 48-154(a) before building.
Does this rule apply citywide?
It applies to the residential setback-line districts covered by § 48-154 (R-1 through R-5-C); it is not a general retaining-wall engineering standard.

Sources & Official References

Other rules in Wilmington

All Wilmington rules

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