Delaware · Sign permitting

Commercial sign permits in Delaware.

Delaware is unusual in two ways. Land-use and sign permitting outside incorporated towns are run by just three county governments (New Castle, Kent, Sussex), so the county is the primary permit authority for most commercial sites. And Delaware layers a mandatory state referral on top: under the state outdoor-advertising program, DelDOT governs essentially all signs over 32 square feet, and a DelDOT sign-off is required before a county will issue a permit for larger ground/pole signs.

What makes Delaware different

The 32-square-foot DelDOT threshold is the single most distinctive Delaware fact: any sign over 32 square feet triggers mandatory state Outdoor Advertising review on top of the local permit, and a DelDOT letter of approval is a documented prerequisite for county issuance of larger ground/pole signs.
Counties are the default permit authority. With only three counties and no township tier, the right first question is always 'incorporated or unincorporated, and which jurisdiction?'. That single determination changes who issues the permit.
Delaware does NOT ban billboards statewide; off-premise signs are legal but tightly gated locally. New Castle County limits them to commercial/manufacturing districts, Sussex County requires a Board of Adjustment special-use exception plus a DelDOT 'letter of no objection' on key highways, and Dover prohibits billboards and off-premise signs outright within city limits.

Statewide rules that apply broadly

DelDOT Outdoor Advertising. The 32-SF trigger

Under the state outdoor-advertising regime (Title 17, Ch. 11; 2 Del. Admin. Code 2601), any sign exceeding 32 square feet generally requires state involvement. In New Castle County, a DelDOT Letter of Approval from the Roadside Control Division is required for all ground and pole signs 32 square feet and greater before the county permit issues; Sussex and Kent route signs over 32 square feet to State Outdoor Advertising as well.

The typical permit process

01Identify your permitting authority by location — incorporated towns/cities issue their own sign permits; everything in unincorporated areas falls to one of the three counties (New Castle, Kent, Sussex).
02Determine the DelDOT trigger early — any sign over 32 square feet generally requires state involvement, and a DelDOT letter of approval before the county permit for larger ground/pole signs.
03Apply for the local sign/building permit (New Castle County uses an online eApply/ePlans system), typically with a licensed contractor, building plans, and a sealed site plan by a DE-registered engineer or surveyor.
04For electronic/digital signs, expect extra documentation (New Castle County requires a signed EVMS certification; Dover and others cap electronic message centers).
05For off-premise/billboard work, expect a higher bar. New Castle County allows them in commercial/manufacturing districts only; Sussex County requires a Board of Adjustment special-use exception plus a DelDOT letter of no objection on Routes 1, 13, 113, and 9.
06Larger or taller structures need a sealed engineer/architect design (New Castle County flags signs over 150 square feet or 25 feet for a registered design professional's seal).
07Pay fees, obtain the permit (and any sign sticker), then install; historic-district or board-of-adjustment review adds time.

Notable jurisdictions

New Castle County

The primary permit authority for the populous north (outside towns), using an online eApply/ePlans system. Requires a DelDOT Letter of Approval for all ground/pole signs 32 square feet and greater, allows off-premise signs in commercial/manufacturing districts only, and may require a registered design professional's seal for signs over 150 square feet or 25 feet.

Wilmington

The largest city; it issues its own permits via the Department of Land Use and Planning, with sign rules in city code Chapter 41. Residential districts allow only small non-illuminated window signs and plaques.

Dover

The state capital (Kent County); the city issues sign permits via Planning & Inspections and notably PROHIBITS billboards, off-premise signs, and roof signs within city limits, while restricting electronic message centers (no movement; limited message change).

Sussex County

The beach/resort south; its modernized sign ordinance permits billboards only in commercial zones with a Board of Adjustment special-use exception, and signs on Routes 1, 13, 113, and 9 require a DelDOT letter of no objection. Signs over 32 square feet also go to State Outdoor Advertising.

Rehoboth Beach

A small dense beach town with its own Building & Licensing sign review and a Table of Sign Requirements by zoning district, requiring mock-ups, photos, and a sign contract, and issuing a sign sticker on approval.

On timelines

Timelines vary sharply by jurisdiction and sign type. A small on-premise wall or monument sign under 32 square feet with complete plans can move quickly at the local level (days to a few weeks). Anything over 32 square feet adds a mandatory DelDOT review step that runs in parallel. Off-premise/billboard or digital work is the slow path — Sussex County's Board of Adjustment special-use exception is a public-hearing process taking weeks to months, and DelDOT letters add lead time. Confirm current queue times with the county/town and DelDOT Roadside Control.

What adds review, time, or cost

Any sign over 32 square feet triggers mandatory DelDOT Outdoor Advertising review, and a DelDOT letter of approval before county issuance of larger ground/pole signs.
Larger or taller signs (over 150 square feet or 25 feet in New Castle County) require a registered design professional's seal.
Electronic message centers require extra documentation and face local caps (Dover; New Castle County EVMS certification).
Off-premise billboards face the highest bar — district limits (New Castle), a special-use exception plus DelDOT letter of no objection (Sussex), or outright prohibition (Dover).

Small on-premise signs under 32 square feet are handled purely locally and avoid the DelDOT step, and incorporated towns set their own exemptions, but confirm the exact jurisdiction for a given parcel, since the county-versus-town determination changes who issues the permit.

Questions people ask

What's special about Delaware's 32-square-foot rule?

Any sign over 32 square feet triggers mandatory state DelDOT Outdoor Advertising review on top of the local permit, and a DelDOT letter of approval is a documented prerequisite for a county to issue a permit for larger ground or pole signs. So a freestanding commercial sign usually means dual approval.

Who issues sign permits in Delaware?

For unincorporated land, one of just three counties: New Castle, Kent, or Sussex (there's no township tier). Incorporated towns and cities (Wilmington, Dover, Rehoboth Beach) issue their own. The first question is always whether the site is incorporated or unincorporated.

Can I put up a billboard in Delaware?

Sometimes, but it's tightly gated. Delaware doesn't ban billboards statewide, but New Castle County limits them to commercial/manufacturing districts, Sussex County requires a Board of Adjustment special-use exception plus a DelDOT letter of no objection on key highways, and Dover prohibits them entirely within city limits.

Sources

Informational only, not legal advice. Sign codes and fees change and vary by jurisdiction — confirm current requirements with the local department before you rely on them.

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