Solar Energy in O'Fallon, MO (2026)
1 verified solar energy rules for O'Fallon, Missouri, sourced directly from the municipal code and official government pages.
Verified from official government sources
Panel Permits
O'Fallon requires a building permit before any solar energy system is installed, with a $50 fee for residential jobs and $100 for commercial or industrial ones. Ground-mounted arrays go in the rear yard only and are capped at 15 feet in residential zones.
O'Fallon Solar Panel Permit Rules
Some RestrictionsO'Fallon Code § 400-920(C)
Building Permit. It shall be unlawful for any renewable energy system to be constructed, erected, and/or installed without a building permit. Renewable energy systems shall comply with all applicable Building, Mechanical, Plumbing, and Electrical Codes adopted by or applicable to the City of O'Fallon. A building permit fee shall be fifty dollars ($50.00) for systems installed on residential pro...
Looking for St. Charles County county-wide rules?
County ordinances apply to unincorporated areas and may supplement O'Fallon city rules.
Solar Energy in St. Charles County →