New Castle County building permits & inspections
Find the office responsible for building permits, plan review, inspections, and zoning in New Castle County, Delaware.
Researched offices in New Castle County
Finding the right permit office
- Identify the exact property address and municipality.
- Confirm whether the city, town, township, borough, parish, county, or regional authority serves that address.
- Ask which permits, zoning approvals, plan reviews, and inspections apply to the project.
- Keep the official portal, permit number, approved plans, and inspection instructions together.
Our guide City or county: who issues your building permit? explains how to check city limits and unincorporated areas using parcel maps and tax records.
What to check in Delaware
Delaware has no statewide building code. Kent, New Castle, and Sussex counties issue permits in unincorporated areas, incorporated towns may run their own offices, and all local codes must meet the state energy code.
County and municipal codes. An address inside an incorporated city or another local jurisdiction may be served by a separate building department.