Portland, ME Solar Energy: Panel Permits (2026)
Key Facts
- Ground-mounted zones allowed
- B-4, I-L, I-Lb, I-M, I-Mb, I-H, A-B only
- Ground-mounted height cap
- 20 ft above base of support
- Minor system setback from RN/B-1/B-2
- 50 ft
- Major system setback from RN/B-1/B-2
- 75 ft
- Roof-mounted systems
- excluded from height calculation
- Governing section
- LUC § 6.4.38
Summary
Portland's Land Use Code allows roof-mounted solar panels citywide without counting them toward maximum structure height, while ground-mounted systems are confined to the B-4, I-L, I-Lb, I-M, I-Mb, I-H, and A-B zones and capped at 20 feet, under § 6.4.38; major systems go through conditional-use review before a building permit issues.
6.4.38 Solar energy systems (major and minor) A. In general 1. All solar energy systems shall meet the technical, safety, and maintenance standards in the City of Portland Technical Manual. ... B. Ground-mounted solar energy systems 1. Ground-mounted solar energy systems are only permitted in the B-4, I-L, I-Lb, I-M, I-Mb, I-H, and A-B zones. ... 6. The absolute height of any ground-mounted solar energy system shall be no more than 20 feet above the ground as measured from the base of the support. ... C. Roof-mounted solar energy systems 1. Roof-mounted solar energy systems are not included in the calculation of maximum structure height.
Official source re-checked September 7, 2026: the cited page had not changed since it was quoted.
Full Breakdown
38 of the Land Use Code, effective July 1, 2026, sets the siting standards every solar installation must clear before the city issues a permit. All systems must meet the technical, safety, and maintenance standards in the City of Portland Technical Manual and must minimize construction and glare impacts on neighboring properties and roadways. Ground-mounted systems are the most restricted: subsection B confines them to seven zones, B-4, I-L, I-Lb, I-M, I-Mb, I-H, and A-B, and caps their absolute height at 20 feet above the base of the support, while minor ground-mounted systems must sit at least 50 feet from any RN zone and the B-1 and B-2/B-2b zones, and major ground-mounted systems must sit at least 75 feet from those same zones.
Roof-mounted systems get a lighter touch: subsection C exempts them from the calculation of maximum structure height, though flat-roof systems in residential zones are capped at 5 feet above the roof surface with a one-foot roof setback for every foot of height, and pitched-roof systems must mount parallel to and no higher than the roof surface. 4 authorizes only the filing and processing of applications for permits, including a building permit, before construction can begin.
Violations & Fines
Installing a ground-mounted solar energy system outside the seven zones listed in § 6.4.38(B), exceeding the 20-foot height cap, or building a major system without first securing conditional-use approval under § 6.5.6 is a zoning violation; roof-mounted systems that exceed the flat-roof height and setback standards in § 6.4.38(C) are likewise subject to code enforcement and can be required to be modified or removed.
Frequently Asked Questions
Where in Portland can I install a ground-mounted solar array?
Does a rooftop solar panel count against my building's maximum height in Portland?
Do large solar installations need extra approval beyond a standard building permit in Portland?
Sources & Official References
Other rules in Portland
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