State Guide · Verified 2026
Fence Installation Permits in Delaware
Fences are governed mainly by local zoning, not a statewide building permit. Cities set height limits (commonly 3-4 ft in front yards and 6 ft in back and side yards), setbacks, and corner sight-line rules, and many require a zoning permit for any fence. Most jurisdictions exempt fences up to 7 ft from a building permit (IRC R105.2) and require one above that. Replacing a fence at the same height, material, and location usually needs no permit; a fence used as a pool barrier always does.
The Building Code in Delaware
No statewide code — New Castle and Sussex use 2021 IRC, Kent County uses 2018 IRC
Delaware's three counties each independently adopt and enforce their own ICC-based residential code; there is no statewide requirement to use the same edition. New Castle County and Sussex County currently enforce the 2021 IRC, effective January 1, 2024 and January 1, 2023 respectively, while Kent County still enforces the 2018 IRC. Incorporated towns within each county can adopt further amendments of their own on top of the county baseline.
Quick Facts
Who Sets the Rules
Only 3 counties, but genuinely independent rules
Delaware's small size, just three counties, does not translate into uniformity: New Castle, Kent, and Sussex each adopt their own code edition and set their own fence exemptions entirely independently, with New Castle currently on the 2021 IRC, Sussex also on the 2021 IRC, and Kent still on the 2018 edition.
New Castle County has an unusually broad exemption
A fence of any height is exempt from a building permit in New Castle County; only a fence serving as a swimming pool barrier requires one. This does not remove zoning's own height caps and setback rules, but it is a genuinely unusual level of building-permit permissiveness for fence height specifically.
Sussex County reflects its agricultural roots
Sussex County, the largest and most rural of Delaware's three counties, allows residential fences up to 7 feet on back and side lot lines, the most permissive of the three. Its older "lawful fence" agricultural standard, by contrast, is only 4 feet, a real historical artifact from when the statute was written primarily with livestock containment in mind rather than modern residential zoning.
A statewide barbed wire rule with two layers
25 Del. Code § 1301 restricts barbed wire in two distinct ways: it cannot be used on a division fence between two properties without both owners' agreement, and any fence containing barbed wire, razor wire, or similar material is barred outright in residential districts without prior zoning board approval, unless the property is used for farming or educational purposes.
A fence-viewer statute still on the books, with real numbers
Delaware's fence-viewer system, a holdover from colonial-era agricultural law, remains codified today, complete with a modern compensation figure: fence viewers are paid $8.00 per day plus 7 cents per mile for travel to and from a disputed fence, a small but genuinely current detail written directly into the state code.
What people get wrong
The most common mistake is assuming Delaware's three counties share a common fence threshold because the state is so small. They do not: New Castle's any-height exemption and Sussex's 7-foot cap reflect real, independent local decisions, not a shared statewide baseline.
Counties With Their Own Rules
These Delaware counties have verified, county-specific fence installation rules that differ from the state baseline:
Check Your County
Select your county for the local rule, fees, and your building department's contact details:
Building It Yourself? Here's What You'll Need
Popular tools and materials homeowners use for a fence installation project:
As an Amazon Associate, we earn from qualifying purchases.
Official Sources
Rules change and cities within a county may differ. This guide is general information, not legal advice — always confirm with your local building department. Reviewed by the StateDataIndex Editorial Team · Updated September 2026.