Building Permits in Delaware

We cover 11 cities in Delaware. Select a city below to see local permit requirements.

11 Cities Covered

1,113 Permit Rules

IRC Building Code Base

Building Codes in Delaware

Building permit requirements in Delaware are enforced at the local level, each city and county building department sets its own rules, fees, and timelines. Most cities in Delaware follow the 2018 IRC.

We cover 11 cities in Delaware with 1,113 specific permit rules. That's real, locally researched data, not generic advice. Each city page shows exactly what triggers a permit, what's exempt, estimated fees, and how to apply.

The bottom line: don't assume your city follows the same rules as the one next door. A fence that's exempt in one town might need a full permit two miles away. Always check your specific city.

Permit Fees Across Delaware

Across the 11 cities we cover in Delaware, permit fees range from $25 – $5,000. The average sits around $145 – $604.

Fees vary a lot by city and project type. A simple fence permit might run you $50, while a full room addition could be $2,000+. Most cities calculate fees based on your estimated project value, typically 1–2% of construction cost. Check the specific city page for accurate numbers.

Common Permit Exemptions in Delaware

These are the most common projects that don't require a permit across cities in Delaware. Keep in mind, "exempt from a permit" doesn't mean "exempt from code." You still have to build to code even without a permit.

Windows and Doors: Exempt in 20 of our 11 covered cities

Fence: Exempt in 20 of our 11 covered cities

Tree Removal: Exempt in 11 of our 11 covered cities

Siding: Exempt in 11 of our 11 covered cities

Shed: Exempt in 11 of our 11 covered cities

Exemptions vary by city. Always verify with your local building department before starting work.