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READYDOCSCOMPLIANCESTATESDELAWARENEW CASTLE COUNTY
FILE 10003 · COUNTY OF NEW CASTLESEAT · WILMINGTONPOPULATION · 570KVERIFIED · 05 / 2026
Public Compliance Directory · County Hub

New Castle.

New Castle County in Delaware. This is where the state file translates into the local offices that actually issue the permit, schedule the inspection, and sign the filing. Start with the state baseline, then drill into the right city.

Cities on file
1
Trades indexed
12
County seat
Wilmington
Last verified
05 / 2026
FAST FACTS

New Castle County at a glance

Quick-reference card
County seatWilmington
Population (est.)570K
FIPS10003
Building departmentNew Castle County Department of Land Use
Permit portalNew Castle County Property Information System (ParcelView)
Fire marshalNew Castle County Office of the Fire Marshal
Browse cities→Back to state←
County of
New Castle
· ACTIVE FILE ·
ARTICLE I · COUNTY BASELINE
CODES & LOCAL AUTHORITY
FIPS 10003
Article I · County Baseline

The county inherits from the state. And adds local rules.

New Castle County enforces the 2018 International Building Code and related 2018 International Codes with local amendments.

New Castle County Department of Land Use manages permits for all unincorporated areas and several smaller municipalities that contract for services. Larger incorporated cities like Wilmington, Newark, and Middletown maintain their own independent building and zoning departments. The county enforces specific environmental overlays including the Christina River Watershed and various floodplain management districts.

New Castle County enforces a mandatory Unified Development Code (UDC) that includes strict requirements for forest preservation and tree canopy replacement during site development.

How this fits with the state

The state authority here is Delaware Division of Revenue; Delaware Division of Professional Regulation. The county file does not replace that — it adds the permit office, local overlays, and the actual filing path.

Source · New Castle County Department of Land UseLast verified · 05 / 2026
ARTICLE II · PERMIT OFFICES
WHERE THE PERMIT IS FILED
OPERATING PATH
Article II · Local Offices

Who issues, who inspects, who signs off.

Contractors must register with the New Castle County Department of Land Use and provide a valid Delaware business license to pull permits.

Building

New Castle County Department of Land Use

Permits, plans, inspections

Verify hours, requirements, and fees on the local portal before filing.

Office · local
See sources →
Permit portal

New Castle County Property Information System (ParcelView)

Apply, track, pay

Verify hours, requirements, and fees on the local portal before filing.

Office · local
See sources →
Planning / zoning

New Castle County Department of Land Use

Land use, plan review

Verify hours, requirements, and fees on the local portal before filing.

Office · local
See sources →
Fire marshal

New Castle County Office of the Fire Marshal

Prevention, alarms, sprinklers

Verify hours, requirements, and fees on the local portal before filing.

Office · local
See sources →
ARTICLE III · INSURANCE & BONDS
COUNTY OVERLAY ON STATE BASELINE
VERIFY BEFORE BIDDING
Article III · County Overlay

What New Castle County usually adds.

The state sets the floor. The county and city can require additional certificates, local bonds, or pre-permit registration.

CoverageRequired?MinimumIssued by
Workers' CompensationState rule with county add-ons
Verify
Required with employees; verify exemptions
State authority
General LiabilityOften required by permit type
Conditional
Permit-based
New Castle County Department of Land Use
Surety BondTied to state license or county permit
Conditional
Local or trade-specific bonds vary
State or county
County overlayContractors must provide proof of general liability insurance and workers' compensation coverage as required by the state of Delaware to obtain county permits.
Verify
Varies
New Castle County Department of Land Use
Source · New Castle County Department of Land UseVerify before filing
ARTICLE IV · INDEXED CITIES
CITIES IN NEW CASTLE COUNTY
1 CITY
Article IV · Browse by City

Indexed cities in New Castle County.

Pick a city to open its trade list. The trade page covers licensing, permits, insurance, and typical costs for that work in that city.

WilmingtonNew Castle County
01
ARTICLE V · TRADES
TRADES IN NEW CASTLE COUNTY
12 TRADES
Article V · Trades

Trades branching in New Castle County.

Each trade opens against the first indexed city in the county. Use the city browser above to open the same trade in another city.

Concrete
CODE · CN
GL
Open file →
Electrical
CODE · EL
State Lic.GLBond
Open file →
Flooring
CODE · FL
GL
Open file →
Framing
CODE · FR
GL
Open file →
General Contracting
CODE · GC
State Lic.GLBond
Open file →
HVAC
CODE · HV
State Lic.GLBond
Open file →
Landscaping
CODE · LS
GL
Open file →
Painting
CODE · PT
GL
Open file →
Pest Control
CODE · PC
State Lic.GL
Open file →
Plumbing
CODE · PL
State Lic.GLBond
Open file →
Pool Service
CODE · PS
GLBond
Open file →
Roofing
CODE · RF
LicenseBondGL
Open file →
ARTICLE VI · SOURCES
LOCAL SOURCE REGISTER
VERIFY LOCALLY
Article VI · Sources & Citations

Every filing needs a source trail.

This template keeps the county page honest: local context here, filing decisions made with the issuing office.

State

Delaware Division of Revenue; Delaware Division of Professional Regulation

Statewide licensing, reciprocity, and renewal rules.

/contractors/delaware
VERIFIED
05 / 2026
County

New Castle County Department of Land Use

Department that issues permits and schedules inspections for unincorporated areas.

New Castle County Property Information System (ParcelView)
VERIFIED
05 / 2026
Planning

New Castle County Department of Land Use

Land use, zoning review, and plan approvals.

Local planning office
VERIFIED
05 / 2026
Fire

New Castle County Office of the Fire Marshal

Prevention, protection systems, and code approvals.

Fire marshal's office
VERIFIED
05 / 2026
Frequently Asked

Questions contractors ask before filing.

Q01Do I need a state license to work in New Castle County?+
Usually yes — the baseline is the state license through Delaware Division of Revenue; Delaware Division of Professional Regulation. New Castle County and its cities may add local registration before you pull a permit.Source · Delaware Division of Revenue; Delaware Division of Professional Regulation
Q02Does the county or the city issue the permit?+
It depends on where the work is. Unincorporated areas usually route through the county (New Castle County Department of Land Use). Work inside an incorporated city normally files with that city's department.Source · New Castle County Department of Land Use
Q03What changes between county and state?+
The county adds the actual permit office, local zoning overlays, plan-review timelines, inspections, and local fees. The state license defines who can contract; the county defines how the job gets filed.Source · County and municipal departments

Open the county file. Then pick the city.

New Castle County now inherits from the state template and adds its own local detail. The next layer is the city and trade pages.

Browse cities→Back to state←