Remodeling in Wilmington

Wilmington's guides cover two kinds of housing. Inside the city, 43%¹ of homes were built before 1940, rows of brick houses on streets like those in Trolley Square, while New Castle County around it is mostly postwar and newer. The city and the county each run their own permit office, so the address decides which rules apply.

Illustration of a Wilmington block of early-1900s brick rowhouses with bay windows, iron railings and front stoops. — Illustration

Guides for Wilmington

Bathroom remodelingMidrange bathroom remodel: $27,767²
What a bathroom remodel costs in the Wilmington area, how the city's old rowhouses change the work, New Castle County and city permit rules, and how to reach a company.
Kitchen remodelingMinor kitchen remodel: $28,130²
Kitchen remodel costs near Wilmington, what rowhouses and postwar Cape Cods mean for layout and venting, how homes are heated, and the city and county permit rules.
Whole-home remodelingMajor kitchen remodel: $81,121²
Room-by-room costs from the Philadelphia market, how Wilmington rowhouses and historic districts shape a full renovation, and New Castle County permits and repair loans.
Accessible bathroomsUniversal-design bathroom remodel: $45,749²
What a universal-design bath costs in the Philadelphia market, how many older Wilmington residents struggle with stairs, and the programs that help pay.
Basement finishingBasement remodel: $52,199²
What finishing a basement costs in the Philadelphia market, New Castle County's radon zone and free state test kits, Wilmington's combined sewers, and the permits.
Rental conversionsAccessory dwelling unit (new detached build): $165,536²
How Wilmington zoning treats rowhouse conversions, New Castle County's owner-occupied accessory unit rules, city rental licenses and Delaware's lodging tax.

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Sources

U.S. Census Bureau, American Community Survey 2020–2024 5-year, table B25034. Released January 29, 2026. Wilmington city, Delaware.
Zonda / Journal of Light Construction, Cost vs. Value 2025, Philadelphia, Pennsylvania. Released 2025. Philadelphia, PA (Cost vs. Value market). Industry source.