How much does a building permit cost in Wilmington, DE?

Fees are calculated as: Valuation-based: $12 per $1,000 of construction cost (building permit). Plan check fee: Not separately identified; included in or alongside permit fee.

How do I apply for a building permit in Wilmington, DE?

1. Prepare all documents: completed City of Wilmington Building Permit Application, job valuation and scope description, plans/plot plan if required, trade subcontractor list (plumbing, electrical, HVAC), and up to 3 signed/sealed plan sets for commercial work 2. Submit application online via the Munis portal, by email to [email protected], or in person at 800 N. French Street, 3rd Floor 3. Application is routed to appropriate reviewers: Zoning, Public Works, Historic District Commission (if applicable), Fire Marshal. Reviews may occur simultaneously or sequentially 4. Pay permit fees: by phone at (302) 576-2620; in person at the Department of Finance, 1st Floor, 800 N. French Street; or by mail to Department of Land Use and Planning with the application number noted 5. Once all reviews are approved and fees are paid, permit is issued 6. Schedule inspections 48 hours in advance through the online portal or by phone 7. Pass all required inspections and obtain Certificate of Occupancy or Certificate of Compliance

How long does it take to get a building permit in Wilmington, DE?

Typical processing time is Not published. Contact (302) 576-3030 for estimates..

What work is exempt from building permits in Wilmington, DE?

The following work is generally exempt: Interior painting; Minor roof repairs involving less than 100 sq ft of drywall; Carpeting and floor underlayment; Plumbing fixture replacements with no in-wall changes; Residential vinyl window replacements in 1- and 2-family homes (Historic Districts excluded); Storm doors and front doors (permit required in Historic Districts); Downspouts and gutters (permit required in Historic Districts); Small drywall repair less than 100 sq ft or 3 sheets, not affecting a structural or fire-rated wall. Note: Properties in Historic Districts have additional permit requirements for many items that are otherwise exempt.

How do I schedule a building inspection in Wilmington, DE?

Inspections can be scheduled via: Munis Portal, (302) 576-3030. 48-hour advance notice required.

City Building Permits

Wilmington, DE - 2026 Building Permit Guide

How to apply for a building permit in Wilmington, Delaware. Permit authority, application steps, fees, and inspection requirements.

Delaware New Castle County Updated March 2026

Permit Authority

The City of Wilmington is a fully independent municipality and does not use NCC Land Use for building permits. Wilmington is the largest city in Delaware.

Department: Department of Licenses and Inspections (L&I); Land Use and Planning handles zoning and some plan review components
Address: Louis L. Redding City/County Building, 800 N. French Street, 3rd Floor, Wilmington, DE 19801
Phone: (302) 576-3030
Email: [email protected]
Website: https://www.wilmingtonde.gov/government/city-departments/department-of-licenses-and-inspections

Online Permit Portal

Open Munis Self-Service

Platform: Tyler Technologies • Account required: Yes • Submission: Online only

Additional resources:

Business License Portal

Application Process

Prepare all documents: completed City of Wilmington Building Permit Application, job valuation and scope description, plans/plot plan if required, trade subcontractor list (plumbing, electrical, HVAC), and up to 3 signed/sealed plan sets for commercial work
Submit application online via the Munis portal, by email to [email protected], or in person at 800 N. French Street, 3rd Floor
Application is routed to appropriate reviewers: Zoning, Public Works, Historic District Commission (if applicable), Fire Marshal. Reviews may occur simultaneously or sequentially
Pay permit fees: by phone at (302) 576-2620; in person at the Department of Finance, 1st Floor, 800 N. French Street; or by mail to Department of Land Use and Planning with the application number noted
Once all reviews are approved and fees are paid, permit is issued
Schedule inspections 48 hours in advance through the online portal or by phone
Pass all required inspections and obtain Certificate of Occupancy or Certificate of Compliance

Typical processing time: Not published. Contact (302) 576-3030 for estimates.

Source: Department of Licenses and Inspections (L&I); Land Use and Planning handles zoning and some plan review components

General Requirements

New structures, structural modifications, demolition, re-roofing, commercial window replacement, and electrical/plumbing/mechanical work (even repairs).

Required Documents

Building permit application
Job valuation
Site/plot plan
Construction drawings (signed/sealed for commercial projects)
Trade list
Zoning approval
Fire Marshal review letter for commercial projects

Permit validity: Not specified in available public materials; contact (302) 576-3030.
Building code: Adopts ICC Building Codes (edition not confirmed from public pages; the city references alignment with ICC codes). Contact L&I at (302) 576-3030 to confirm current edition.
Owner-builder: Not detailed in available public materials.
Contractor requirements: Not detailed on L&I public pages. City of Wilmington may have separate contractor registration requirements; confirm with the department.

Fees

Plan check fee: Not separately identified; included in or alongside permit fee
Permit fee formula: Valuation-based: $12 per $1,000 of construction cost (building permit)
Trade permit fee: $20 each (Electrical, Plumbing, HVAC)
Payment note: Pay by phone at (302) 576-2620, in person at Finance (1st Floor, 800 N. French), or by mail to Department of Land Use and Planning. Additional fees: Certificate of Compliance = $50; Temporary CO (commercial) = $250; Temporary CO (residential) = $100; Change of Occupancy = $100

Fees change. Verify current amounts at the official fee schedule (effective Current).

Work That Does NOT Require a Permit

Interior painting
Minor roof repairs involving less than 100 sq ft of drywall
Carpeting and floor underlayment
Plumbing fixture replacements with no in-wall changes
Residential vinyl window replacements in 1- and 2-family homes (Historic Districts excluded)
Storm doors and front doors (permit required in Historic Districts)
Downspouts and gutters (permit required in Historic Districts)
Small drywall repair less than 100 sq ft or 3 sheets, not affecting a structural or fire-rated wall

Important: Properties in Historic Districts have additional permit requirements for many items that are otherwise exempt.

Inspections

How to Schedule

Munis Portal (online)
(302) 576-3030 (phone)

Scheduling deadline: 48-hour advance notice required
Inspection hours: Monday through Friday, 8:30 a.m. to 4:30 p.m.

Typical inspection sequence: Typical sequence: Footings/slabs (before pouring); foundation walls (before backfilling); plumbing, electrical, and heating rough-in; framing (before drywall); final inspection; Certificate of Occupancy or Compliance.

Additional Resources

Building code: Adopts ICC Building Codes (edition not confirmed from public pages; the city references alignment with ICC codes). Contact L&I at (302) 576-3030 to confirm current edition.
Zoning information: View zoning info
Construction and Development Overview
Permit Search and Inspection Lookup
License lookup guide: Delaware Contractor License Requirements
Contract template: Delaware Homeowner-Contractor Agreement
Delaware hub: Delaware Contractor License & Permit Hub

Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the Department of Licenses and Inspections (L&I); Land Use and Planning handles zoning and some plan review components before applying.

Frequently Asked Questions

Wilmington Building Permit FAQ

Do I need a building permit in Wilmington, DE?: New structures, structural modifications, demolition, re-roofing, commercial window replacement, and electrical/plumbing/mechanical work (even repairs).
How much does a building permit cost in Wilmington, DE?: Fees are calculated as: Valuation-based: $12 per $1,000 of construction cost (building permit). Plan check fee: Not separately identified; included in or alongside permit fee.
How do I apply for a building permit in Wilmington, DE?: 1. Prepare all documents: completed City of Wilmington Building Permit Application, job valuation and scope description, plans/plot plan if required, trade subcontractor list (plumbing, electrical, HVAC), and up to 3 signed/sealed plan sets for commercial work 2. Submit application online via the Munis portal, by email to [email protected], or in person at 800 N. French Street, 3rd Floor 3. Application is routed to appropriate reviewers: Zoning, Public Works, Historic District Commission (if applicable), Fire Marshal. Reviews may occur simultaneously or sequentially 4. Pay permit fees: by phone at (302) 576-2620; in person at the Department of Finance, 1st Floor, 800 N. French Street; or by mail to Department of Land Use and Planning with the application number noted 5. Once all reviews are approved and fees are paid, permit is issued 6. Schedule inspections 48 hours in advance through the online portal or by phone 7. Pass all required inspections and obtain Certificate of Occupancy or Certificate of Compliance
How long does it take to get a building permit in Wilmington, DE?: Typical processing time is Not published. Contact (302) 576-3030 for estimates..
What work is exempt from building permits in Wilmington, DE?: The following work is generally exempt: Interior painting; Minor roof repairs involving less than 100 sq ft of drywall; Carpeting and floor underlayment; Plumbing fixture replacements with no in-wall changes; Residential vinyl window replacements in 1- and 2-family homes (Historic Districts excluded); Storm doors and front doors (permit required in Historic Districts); Downspouts and gutters (permit required in Historic Districts); Small drywall repair less than 100 sq ft or 3 sheets, not affecting a structural or fire-rated wall. Note: Properties in Historic Districts have additional permit requirements for many items that are otherwise exempt.
How do I schedule a building inspection in Wilmington, DE?: Inspections can be scheduled via: Munis Portal, (302) 576-3030. 48-hour advance notice required.

Need help with your project?

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Important: This page is an educational resource provided by jaspector.com. It is not legal advice, and it does not substitute for official guidance from the permit authority listed above. Permit requirements, fees, and processes change frequently. Always verify current requirements directly with the issuing department before beginning any construction project. Use of this page does not create an attorney-client relationship. Jaspector assumes no liability for any outcomes arising from reliance on this information.

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