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New Castle County, DE Solar Energy: Panel Permits (2026)

Light Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified September 2026

Key Facts

Rooftop building permit
Not required for 1-2 family homes
Ground-mounted setback
6 feet from side/rear lot line
Rooftop height limit
No more than 5 feet above roof
Governing section
NCC Code Sec. 6.03.012.C.2.g
Coverage note
Wilmington, Newark have separate codes

Summary

New Castle County exempts rooftop solar panels installed to produce electricity from a building permit on one- and two-family homes, though ground-mounted systems and zoning setback rules still apply.

These county ordinances apply to unincorporated areas of New Castle County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

C.Work exempt from permit. ... Permits shall not be required for the following: ... 2.For one- and two-family dwellings only regulated by the Residential Code. ... g.Installation of rooftop solar panels for the purpose of producing electricity.

Source: NCC UDC Article 40View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 5).

Full Breakdown

New Castle County's building code exempts installation of rooftop solar panels for producing electricity from a building permit, but only for one- and two-family dwellings covered by the Residential Code (Sec. 6.03.012.C.2.g). The permit skip does not waive zoning: a rooftop system still counts toward building height and cannot project more than five feet above the roof under Sec. 40.03.410.M. Ground-mounted home solar arrays aren't on the exemption list, so they need a permit, and must sit at least six feet from side and rear lot lines. Wilmington and Newark run their own separate building and zoning codes.

Violations & Fines

Installing solar without required permits or zoning compliance is a Building Code violation: misdemeanor fines from $200 to $1,000, plus administrative fines up to $1,000 per day and possible stop-work orders.

Frequently Asked Questions

Do I need a permit to put solar panels on my roof in New Castle County?
No. County code exempts rooftop solar panel installation for producing electricity on one- and two-family dwellings from the building permit requirement, per Sec. 6.03.012.C.2.g. It still must meet zoning height and setback standards.
What about a ground-mounted solar array in the yard?
Ground-mounted systems aren't on the exempt list, so a building permit is required, and the array must sit at least six feet from side and rear lot lines under Sec. 40.03.410.M.
Does this exemption apply inside Wilmington or Newark?
New Castle County's Building Code covers unincorporated areas and any incorporated town that opts in; Wilmington and Newark have not, and enforce their own separate building and zoning codes.

Sources & Official References

Other rules in New Castle County

Landscaping Rules: CompostingLight RestrictionsEnvironmental Rules: Coastal DevelopmentSignificant RestrictionsNoise from Specific Sources: Delivery Truck NoiseSome RestrictionsCode Violation Reporting: How to ReportSome RestrictionsWater Use Rules: Leak Reporting DutySome RestrictionsSign Regulations: Window SignsLight Restrictions

All New Castle County rules

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Panel Permits in Cities Across New Castle County

Wilmington, DE