Plumbing Contractor Permit Requirements in Wilmington, DE
Complete permit and license guide for starting a plumbing contractor in Wilmington, New Castle County, Delaware.
Not legal advice. Requirements may change — always verify with your local government authority before applying. Last verified: .
Wilmington / New Castle County Requirements
3 requirementsDelaware Department of Labor — Master Plumber License
Plumbing contractors in Delaware must hold a Master Plumber License from the Delaware Department of Labor. Requires journeyman experience and passing a state exam.
City of Wilmington Revenue Division — Business License
Wilmington requires a City Business License for all businesses operating within city limits. Fees are based on business type. This license must be renewed annually and displayed at your place of business.
New Castle County / Wilmington Plumbing Permit (per project)
A separate permit must be pulled with the local building/plumbing department for each job. Inspections are required upon job completion.
Delaware State Requirements
1 requirementDelaware — No Sales Tax
Delaware has no state or local sales tax. Instead, Delaware levies a Gross Receipts Tax on the seller of goods or provider of services, based on total receipts. Register with the Delaware Division of Revenue.
Federal Requirements
1 requirementEIN (Employer Identification Number)
Required if you have employees or operate as an LLC or corporation. Free from the IRS.
Official Sources
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