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Wilmington, DE Building Setbacks & Zoning: Lot Coverage Limits (2026)

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

Key Facts

W-1/W-2/W-3 max ratio
0.60 of lot area
W-4 rowhouse/garden apt max
0.40 of lot area
W-4 other uses max
0.50 of lot area
Governing section
City Code § 48-356
Pre-1981 lots
may keep existing coverage

Summary

Wilmington caps building coverage at 60 percent of lot area in the W-1, W-2, and W-3 waterfront districts, and at 40 to 50 percent in the W-4 district depending on building type.

In waterfront zoning districts, the lot area occupied by all buildings on a parcel in relation to the total parcel area shall not exceed the ratios set forth below:

District Building Coverage Ratio W-1, W-2 0.60 W-3 0.60 W-4 Rowhouses 0.40 Garden apartments 0.40 Walk-up apartments 0.50 Elevator apartments 0.50 All other uses 0.50

(Code 1968, § 48-40.1(j)(4); Ord. No. 24-004, § 3, 2-15-24)

Editor's note— Ord. No. 24-004, § 3, adopted February 15, 2024, amended the title of § 48-356 to read as herein set out. The former § 48-356 title pertained to building coverage ratio.

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

Section 48-356 of the Wilmington City Code sets the building coverage ratio -- the share of a lot covered by buildings -- for the city's four Waterfront Districts along the river. W-1, W-2, and W-3 parcels cap out at a 0.60 ratio; W-4 tops out at 0.40 for rowhouses and garden apartments and 0.50 for walk-up apartments, elevator apartments, and all other uses. The waterfront development administrator can approve a higher ratio for lots already improved above the cap as of October 8, 1981.

Violations & Fines

Exceeding the district's building coverage ratio without an approved exception is a zoning code violation, enforceable by the department of licenses and inspections under chapter 48's zoning enforcement provisions.

Frequently Asked Questions

Does Wilmington cap lot coverage citywide?
No. The 0.60/0.40-0.50 building coverage ratios in section 48-356 apply only inside the W-1 through W-4 Waterfront Districts; elsewhere the code controls bulk through setbacks and floor area ratio instead.
What counts toward the coverage ratio?
The building coverage area -- land covered by permanent enclosed or open structures -- divided by the gross parcel area, as defined in the zoning chapter's definitions section.

Sources & Official References

Other rules in Wilmington

Setback RulesSome RestrictionsParking Rules: RV & Boat ParkingSignificant RestrictionsStructure Height LimitsSome RestrictionsNoise Ordinances: Decibel LimitsSome RestrictionsParking Rules: Curb Color RulesSome RestrictionsParking Rules: Commercial & Oversized VehiclesHeavy RestrictionsFence Regulations: Fence Permit RequirementsSome RestrictionsFence Regulations: Retaining WallsSome Restrictions

All Wilmington rules

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