Plumbing Contractor Permit Requirements in Dover, DE

1. EIN (Employer Identification Number)

   Required if you have employees or operate as an LLC or corporation. Free from the IRS.

   Official government source

   Free·Immediate (online application)

   Free

   Immediate (online application)

1. Delaware — 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.

   Official government source

   Free (gross receipts tax registration)·Immediate (online)

   Free (gross receipts tax registration)

   Immediate (online)

1. Delaware Board of Plumbing Examiners — Master Plumber License

   Plumbing contractors in Delaware must hold a Master Plumber License from the Division of Professional Regulation's Board of Plumbing, Heating, Ventilation, Air Conditioning and Refrigeration Examiners. Requires journeyman experience and passing a state exam.

   Official government source

   $173 (initial application)·4–8 weeks

   $173 (initial application)

   4–8 weeks

2. City of Dover Planning and Inspections Department — Business License

   Every business operating within Dover city limits must hold a city business license (City Code ch. 26, art. II), separate from any Certificate of Occupancy for the space. Fees are set per business-type category in Appendix F, most recently revised by Ordinance 2024-22 (adopted July 8, 2024). Manufacturers and contractors instead pay a rate on gross receipts, and merchants and bottlers a rate on gross purchases for resale, each with a minimum fee. Licenses are annual and prorated quarterly for businesses that start mid-year.

   Official government source

   Set per category in Appendix F — e.g. barber or beautician $64, manicurist $32, massage therapist $60, fitness trainer $72, food truck $180, eating establishment $128, car wash $192, health spa/club $192, pest control $96, photographer $128; businesses not listed pay $52 (1–3 employees) to $320 (51–100 employees). Contractors and manufacturers pay $0.00046 of gross receipts (minimum $128); merchants and bottlers $0.00046 of gross purchases for resale (minimum $64).·1–3 weeks

   Set per category in Appendix F — e.g. barber or beautician $64, manicurist $32, massage therapist $60, fitness trainer $72, food truck $180, eating establishment $128, car wash $192, health spa/club $192, pest control $96, photographer $128; businesses not listed pay $52 (1–3 employees) to $320 (51–100 employees). Contractors and manufacturers pay $0.00046 of gross receipts (minimum $128); merchants and bottlers $0.00046 of gross purchases for resale (minimum $64).

   1–3 weeks

3. City of Dover Plumbing Permit (per project)

   A plumbing permit must be obtained from the City of Dover Department of Planning and Inspections for new installation, addition, alteration, removal, or conversion of water, drainage, or gas piping, fixtures, water heaters, water supply and distribution (including irrigation), sanitary drainage, traps, and grease interceptors. Kent County does not issue permits inside city limits. Inspections are required on completion; simple fixture replacements and leak repairs are exempt.

   Official government source

   Not published online — the city's permit fee flyer link is broken; confirm with Planning and Inspections (302-736-7010)·1–5 business days

   Not published online — the city's permit fee flyer link is broken; confirm with Planning and Inspections (302-736-7010)

   1–5 business days

Official Sources

• Delaware Department of Labor — Master Plumber License
• City of Dover Planning and Inspections Department

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