Building permits in Wilmington, DE
Permits for Wilmington are issued by City of Wilmington, Dept. of Licenses & Inspections (L&I). Applications go through the portal below.
Checked against the department's own page on 6 Sep 2026
Where to file
- Department
- City of Wilmington, Dept. of Licenses & Inspections (L&I)
- Phone
- 302-576-3030
- Portal
- cityofwilmingtondecitizens.munisselfservice.com/citizens/PermitsInspections/Default.aspx
Tyler Munis Citizen Self Service. 800 N French St, 3rd Floor. Pay permit fees by phone at 302-571-4320, option 7.
What each job needs in Wilmington
Typical requirements and fee ranges. Fees scale with project valuation, so treat these as a starting point and confirm the number with City of Wilmington before you quote.
| Project | Permits | Typical fee | Turnaround |
|---|---|---|---|
| Residential Remodel | Building, Electrical, Plumbing, Mechanical (HVAC) | $150–1,000+ (scaled to project valuation) | 10–15 business days |
| Addition | Building, Electrical, Plumbing, Mechanical (HVAC) | $150–1,000+ (scaled to project valuation) | 10–15 business days |
| New Construction | Building, Electrical, Plumbing, Mechanical (HVAC), Site / Grading | $500–3,000+ (scaled to valuation; plan review separate) | 10–15 business days |
| Electrical | Electrical | $50–250 | 3–5 business days |
| Plumbing | Plumbing | $50–200 | 3–5 business days |
| HVAC / Mechanical | Mechanical (HVAC) | $50–250 | 3–5 business days |
| Roofing | Roofing | $100–400 | 1–5 business days |
| Deck / Fence | Building | $150–1,000+ (scaled to project valuation) | 10–15 business days |
| Demolition | Demolition | $50–400 | 5–10 business days |
| Commercial Build-Out | Building, Electrical, Plumbing, Mechanical (HVAC), Fire / Life-Safety Review | $300–2,000+ (scaled to valuation; plan review separate) | 10–15 business days |
Licensing in Delaware
No statewide general-contractor competency license; contractors need a state business license from the Division of Revenue, and any competency/GC licensing is handled locally.
Issued by Delaware Division of Revenue (business license); local jurisdictions for GC competency · Verify a licence
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Department, portal and phone checked against the official page on 6 Sep 2026. Fee ranges and turnaround times are typical for this kind of work and are not quotes. Requirements change, so confirm with the department before you file. SQM.AI is not a law firm and this page is not legal advice.