Gaithersburg, MD Solar Energy: Panel Permits (2026)
Key Facts
- Adopted code
- 2021 IECC, City Code § 5-12/5-13
- Commercial solar-ready rule
- Appendix CB, § 5-13(18)
- Residential solar-ready rule
- Appendix RB, § 5-13(19)
- Ground-mounted solar
- Exempt from setbacks, § 24-6.4(A)(2)
- Enforcement
- Planning and Code Administration, (301) 258-6330
- Default penalty
- Up to $500 fine or 90 days, § 1-7
Summary
Gaithersburg does not run a separate solar panel permit; installing panels goes through the standard Chapter 5 building and electrical permit process. What the code does add is a solar-ready mandate: new commercial buildings and new one- and two-family homes and townhouses must reserve wiring pathways and roof structural capacity for future solar systems under adopted Appendix CB and Appendix RB of the 2021 IECC.
(18)Add new Appendix CB. Appendix CB Solar-Ready Zone—Commercial. Appendix CB of the 2021 International Energy Conservation Code is hereby adopted in its entirety. Appendix CB is intended to encourage the installation of renewable energy systems by preparing buildings for the future installation of solar energy equipment, piping and wiring. (19)Add new Appendix RB. Appendix RB. Solar-Ready Provisions—Detached One and Two-Family Dwellings and Townhouses. Appendix RB of the 2021 International Energy Conservation Code is hereby adopted in its entirety.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 52 Update 1).
Full Breakdown
The City adopted the 2021 International Energy Conservation Code as its energy code under City Code § 5-12, then modified it under § 5-13. " Item (19) adds Appendix RB, Solar-Ready Provisions for detached one- and two-family dwellings and townhouses, on the same terms: it does not force a builder to install panels, but it does force the builder to provide the space, connection pathways, and roof structural capacity a future system would need. Actually mounting panels afterward is not a distinct permit category; it runs through the amended IBC permitting scheme at City Code § 5-3, and any electrical work follows Chapter 7, Electricity, since § 5-13(4) redirects every IECC electrical-code reference there.
4(A)(2) lists "ground mounted solar" among the items exempt from the accessory-structure setback and footprint rules that apply to sheds, playground equipment, and similar structures. Permits and inspections for both the solar-ready building elements and any later solar installation are handled by the Department of Planning and Code Administration, Permits and Inspections Division; questions on inspections may be directed to staff at (301) 258-6330 per the Chapter 5 Certified Inspections Program provisions.
Violations & Fines
The IECC modifications in § 5-13 carry no separate penalty clause, so a solar-readiness violation defaults to City Code § 1-7's general penalty: where no specific penalty applies and the offense is not designated a municipal infraction, it is punishable by a fine of up to $500, imprisonment for up to 90 days, or both, with each day the violation continues counted as a separate offense.
Frequently Asked Questions
Do I need a special solar panel permit in Gaithersburg?
What does Gaithersburg's solar-ready rule actually require?
Does the solar-ready rule apply to my existing house?
Can I install ground-mounted solar panels in my yard?
Sources & Official References
Other rules in Gaithersburg
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