Do I Need a Permit to Build a Shed in Delaware?

Three Counties, Three Rule Sets

Delaware's shed permit rules are driven by one structural fact: the state has no statewide residential building code. Instead, each of Delaware's three counties — New Castle, Kent, and Sussex — adopts and enforces its own version of the International Building Code and International Residential Code. The result is three distinct permitting regimes operating within a state smaller than many western counties.

This matters because the differences are not minor. A 250-square-foot shed that needs no permit in Kent County requires a full building permit in New Castle County and at least a placement permit in Sussex County. A homeowner in Smyrna, which straddles the Kent-New Castle county line, might face different rules depending on which side of the border their property sits on.

Before buying materials or ordering a pre-built shed, your first step should always be identifying which county (and, if applicable, which municipality) has jurisdiction over your property. For a broader perspective on how shed permits work across the country, see our national guide to shed permits.

New Castle County: 200 Square Feet

New Castle County — home to Wilmington, Newark, and the northern half of the state's population — follows a clear set of rules for accessory structures. The county's code, revised as of January 1, 2026, exempts the following from a building permit:

• One-story detached residential accessory structures used as tool and storage sheds, playhouses, pergolas, free-standing gazebos, and non-habitable similar uses
• Floor area must not exceed 200 square feet
• Eave height of 10 feet or less and a maximum overall height of 20 feet
• The exemption does not apply to garages or structures capable of storing motor vehicles

Even when a building permit isn't required, the shed must comply with all applicable zoning codes. Key zoning rules in New Castle County include:

• Setbacks: Typical residential setbacks are 3 feet from rear and side property lines, though this varies by zoning district
• Front yard prohibition: Sheds cannot be placed in front of the house, with a limited exception for lots over two acres
• Rear yard coverage: Accessory structures can only occupy 30% of the required rear yard area
• Deed restrictions: The county does not review or enforce private deed restrictions — that's the homeowner's responsibility

For sheds between 200 and 480 square feet, you need a building permit and must submit three copies of a plot plan showing property boundaries and existing structures. A mortgage inspection survey works well for this purpose. For sheds over 480 square feet, a permit, plot plan, and a lines and grades survey prepared by a licensed surveyor are required.

The New Castle County Department of Land Use handles all permit applications through their ePlans portal. The county uses the 2018 IRC as its residential code baseline.

Kent County: 300 Square Feet

Kent County — centered on the state capital of Dover — has the most generous permit exemption for sheds in Delaware. The county code exempts one-story detached accessory structures used as tool and storage sheds, playhouses, and similar uses from a building permit when the floor area is 300 square feet or less.

This 300-square-foot threshold is notably higher than New Castle County's 200 square feet and the IRC's default 120 square feet. For practical purposes, it means a 12x24 shed — a popular size for workshops and larger storage buildings — can be built in Kent County without a building permit.

However, Kent County's setback requirements are more aggressive than New Castle's:

• Side setbacks: generally 10 feet
• Rear setbacks: generally 25 feet
• Front setbacks: 25 feet in most zones, increasing to 35 or even 50 feet in some agricultural and residential districts
• Sheds on non-subdivision streets face a 40-foot front setback

These wider setbacks reflect Kent County's more rural character and larger lot sizes. On a typical subdivision lot, the 25-foot rear setback consumes a significant chunk of the backyard, potentially limiting where a larger shed can be placed even if it doesn't need a permit.

The Kent County Office of Inspections and Enforcement, located at 555 Bay Road in Dover, processes all building permits. Permit fees in Kent County start at approximately $120 for residential accessory structures. The county requires all sheds to be anchored on all four corners in accordance with Building Code Section G801 to prevent movement from wind loads.

Some incorporated towns within Kent County impose their own requirements on top of the county code. Dover, for example, requires a building permit for all shed construction regardless of size. If you live within an incorporated town, you may need both a town approval letter and a county building permit.

Sussex County: Permits for Everything

Sussex County takes the strictest approach of the three. The Sussex County Building Code Office requires a permit for all home accessory buildings, regardless of size. There is no square footage exemption for sheds.

The county's process works on a two-tier system:

• Sheds under 400 square feet: require a county placement permit, which verifies the structure's location relative to setbacks and lot coverage limits
• Sheds 400 square feet and larger: require a formal plan review by the Land Use Department, including engineered construction drawings

Sussex County's standard setbacks for accessory structures are 5 feet from rear and side property lines. The county also enforces lot coverage limits that cap the total area of impervious surfaces and structures on each lot.

Some incorporated towns within Sussex County add their own layer of review. Georgetown, for example, requires local planning department approval before the county will issue a building permit. Milford, which straddles the Kent-Sussex county line, routes permits through its own Building Inspections and Permitting office.

The agricultural exemption is most relevant in Sussex County, which has Delaware's largest farming sector. Farm buildings — including barns, silos, and sheds housing farm equipment and livestock — are exempt from the building code as long as they're designed to be occupied by no more than 10 persons. This exemption does not apply to residential accessory structures on rural residential lots.

How Five Delaware Cities Handle Shed Permits

Wilmington: City Licensing on Top of County Code

Wilmington is Delaware's largest city and falls under New Castle County's building code jurisdiction, but the city's Department of Licenses and Inspections adds its own review process. The 200-square-foot permit exemption technically applies, but Wilmington requires a zoning review for any new structure, which means you'll interact with the city even for a small shed.

Wilmington's older, densely packed neighborhoods — particularly in the Brandywine Village, Trolley Square, and Forty Acres areas — have small lots where the 3-foot setback from New Castle County may be difficult to meet. The city also has several historic districts where architectural review may be required.

Permit fees in Wilmington are valuation-based, typically ranging from $75 to $200 for a residential shed. Processing time is approximately 1 to 2 weeks for straightforward applications.

Dover: All Sheds Need a Permit

Dover requires a building permit for all shed construction, regardless of size. This is stricter than Kent County's general 300-square-foot exemption. The city's Planning and Inspections Department at (302) 736-7010 handles all applications.

Dover sits in a transition zone between the state's urbanized north and rural south. Properties in newer subdivisions tend to have HOA restrictions that further regulate shed placement, materials, and design. Properties closer to the Dover Air Force Base may also have height restrictions related to the airfield's approach zones.

Dover permit fees start at approximately $120 and are based on project valuation. Review time is typically 1 to 2 weeks for residential accessory structures.

Newark: University Town with Tight Lots

Newark, home to the University of Delaware, requires a building permit for any shed regardless of size. The city's Code Enforcement Division reviews all applications to ensure compliance with zoning and setback requirements.

Newark's residential neighborhoods near the university have some of the smallest lots in northern Delaware. The combination of tight lot sizes, active code enforcement, and a large renter population (where landlords may be less familiar with local codes) makes permits particularly important here. Newark's permit fees are valuation-based, typically $75 to $150 for a shed.

Milford: Two Counties, One City

Milford is one of the few cities in Delaware that straddles two counties — Kent and Sussex. Properties on the Kent County side follow Kent County's 300-square-foot exemption, while properties on the Sussex County side follow Sussex County's all-sheds-need-a-permit approach. Milford's Building Inspections and Permitting office can clarify which county jurisdiction applies to your property.

This quirk matters because a homeowner on one side of Milford might build a 280-square-foot shed without a permit, while their neighbor across a street boundary needs a Sussex County placement permit for the same structure.

Georgetown: County Seat with Local Review

Georgetown, the Sussex County seat, requires local planning department approval before the county will issue a building permit for a shed. All sheds require a Sussex County permit, and Georgetown adds its own zoning compliance review on top.

Georgetown's requirements include a site plan showing setbacks, lot coverage calculations, and confirmation that the structure meets flood zone requirements if applicable. The town's proximity to the coast means some properties fall within Special Flood Hazard Areas.

Flood Zones: A Delaware-Wide Concern

Delaware's low elevation and extensive coastline create significant flood exposure across all three counties. The state ranks among the most flood-prone in the nation, with large portions of Sussex County, coastal Kent County, and the low-lying areas along the Delaware River and its tributaries designated as Special Flood Hazard Areas.

If your property is in a flood zone, your shed must comply with floodplain management regulations regardless of size. Typical requirements include:

• The shed must be elevated to or above the Base Flood Elevation (BFE) or constructed with flood openings that allow water to enter and exit freely
• Flood openings must meet specific sizing requirements — generally one square inch of net open area per square foot of enclosed floor area
• A floodplain development permit may be required in addition to (or instead of) a standard building permit

In Sussex County, flood zone structures require permits regardless of size — the normal placement permit process applies, plus additional floodplain compliance documentation. New Castle and Kent counties have similar requirements that override any size-based exemptions.

Check your county's flood maps or FEMA's online flood map service to determine whether your property is in a designated flood zone before planning your shed project.

Pre-Built vs. Site-Built: Same Rules Apply

Delaware's counties do not distinguish between pre-built and site-built sheds when it comes to permit requirements. A shed delivered on a flatbed truck is subject to the same square footage thresholds, setback rules, and permit processes as one framed on-site.

Pre-built shed companies often handle delivery and placement, but they generally do not handle permits. The homeowner is responsible for obtaining any required permits before the shed arrives. If a delivered shed is placed in violation of setbacks or without a required permit, the homeowner — not the delivery company — faces enforcement action.

In Sussex County, where all sheds need a permit, you'll want to have your placement permit in hand before scheduling delivery. The county can deny a permit after placement, which would mean moving or removing the shed at your expense.

Adding Electricity or Plumbing

Running electricity or plumbing to a shed triggers additional permit requirements in all three counties, regardless of the shed's size. Electrical work in Delaware requires a separate permit, and all electrical installations must comply with the National Electrical Code as adopted by the county.

In Kent County, electrical and plumbing permits are handled through the State of Delaware rather than the county. The Division of Public Health handles plumbing permits, while the State Electrical Inspector oversees electrical work. This is a unique arrangement — in most states, the same local department handles all construction permits.

If you plan to wire your shed for lighting, outlets, or any electrical service, budget for both the electrical permit fee and the cost of hiring a licensed electrician. Even a simple circuit run from your main panel to the shed requires a permit and inspection.

HOA Restrictions

Delaware has a growing number of Homeowners Association (HOA)-governed communities, particularly in the newer subdivisions of New Castle County (Middletown, Bear, Hockessin) and the beach communities of Sussex County (Rehoboth, Lewes, Bethany Beach area). HOA restrictions commonly include:

• Restrictions on shed materials, colors, and roof style — often requiring the shed to match the home
• Maximum size limits that may be smaller than the county's permit threshold
• Requirements for architectural review committee approval before construction
• Prohibitions on certain shed types (metal, vinyl) or manufacturers

HOA enforcement is separate from county code enforcement. You can have a permit from the county and still be in violation of your HOA's covenants. Check your community's declaration of covenants, conditions, and restrictions (CC&Rs) before planning your shed.

Consequences of Skipping the Permit

Building without a required permit in Delaware carries risks that vary by county:

• Stop-work orders — any county building official can order construction to stop immediately
• Fines — in West Warwick (Kent County area), fines of $250 are common for unpermitted work; other jurisdictions impose similar penalties
• Retroactive permits with increased fees — if the county allows you to apply after the fact
• Removal orders — if the shed violates setbacks, lot coverage, or flood zone requirements
• Sale complications — unpermitted structures create title issues during home sales. Delaware's real estate market is active enough that most buyers will catch unpermitted work during due diligence

The permit cost for a typical shed in Delaware is modest — often $75 to $200 depending on size and county. The cost of removing a shed that can't be retroactively permitted is significantly higher.

If you're also planning a garage or pergola alongside your shed, coordinate with your county building department on total lot coverage. Each county limits the percentage of your lot that can be covered by impervious surfaces and structures.

For an overview of all building permit requirements in Delaware — including decks, fences, pools, and more — see our complete Delaware building permit guide.