Need a site plan or a stormwater design in New Castle County, DE? New Castle County has about 588,093 residents (2024 estimate) and 13 incorporated cities and towns. Describe your project once: licensed civil engineers who work in New Castle County get back to you.
Site plan review in New Castle County is handled by each city, or by the county in unincorporated areas.
Services available in New Castle County
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Site plan, grading and utilities
Civil site plan with grading, utilities and access, sealed by a licensed engineer for the permit.
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Stormwater and drainage design
Drainage calculations and stormwater management design required by the city, county or state.
Frequently asked questions in New Castle County
Do licensed civil engineers cover the whole of New Castle County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Civil Engineering Site Plans in Delaware: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.