Solar Panel Rules in St. Louis, MO (2026)
Solar panel installation rules, mandate status, HOA restrictions, and permit process for St. Louis, MO.
St. Louis, MO does not currently have a solar installation mandate. Solar panels are a permitted use on residential and commercial properties subject to standard building permit requirements. Property owners in St. Louis must obtain a permit before installing solar panels. HOA restrictions on solar are limited by state law. St. Louis offers permit review for residential solar installations. Below you will find the current solar mandate status, HOA rules, permit process, and any historic district restrictions that apply to solar installations in St. Louis.
Solar Mandate Status
No Solar Mandate in St. Louis: St. Louis does not currently have a solar installation mandate for new or existing construction. Installing solar is voluntary and subject to permit requirements. Federal Investment Tax Credit (ITC) may apply — consult a tax professional for current incentive information. Ameren Missouri net metering available for systems under 100kW. Missouri does not have a state solar mandate. St. Louis City's sustainability plan includes renewable energy goals. Community solar programs offered through Ameren Missouri's Renewable Energy Initiative.
HOA Restrictions
HOA Restrictions on Solar in St. Louis: Missouri does not have a strong solar rights law preempting HOA restrictions. HOAs in St. Louis City (uncommon in older neighborhoods) may restrict solar. St. Louis's urban grid neighborhoods typically have no HOA.
Permit Process
Permit Process in St. Louis: St. Louis Building Division electrical permit required for all rooftop solar. Ameren Missouri interconnection application required for net metering. Missouri offers net metering up to 100kW for residential systems. Ameren Missouri's Renewable Energy Standard means utility offers some solar incentive programs. Missouri Property Assessed Clean Energy (PACE) financing may be available.
Historic District Considerations
Historic District Considerations in St. Louis: St. Louis Preservation Board review required for solar installations visible from public right-of-way on contributing structures in local historic districts. Soulard, Lafayette Square, Compton Heights, and Tower Grove East historic districts apply. Review focuses on visibility and reversibility of solar installation. If your property is located in a historic district, contact the St. Louis City Planning and Urban Design Agency before designing your solar system — placement restrictions may affect system output.
Frequently Asked Questions
Is St. Louis City the same as St. Louis County?
No — and this is a critical distinction. St. Louis City is an independent city that separated from St. Louis County in 1876. The City is not part of any county and functions as its own county-equivalent. When searching for zoning, permit, or land use information, make sure you are looking at St. Louis City resources (stlouis-mo.gov), not St. Louis County resources (stlouisco.com). Properties within city limits use the City's zoning code; properties in the suburbs use St. Louis County or their respective municipality's codes.
Can I build an ADU on my St. Louis rowhouse lot?
Yes. St. Louis allows ADUs in residential zones. The traditional St. Louis rowhouse lot typically has a rear yard with alley access — the natural location for a detached ADU or carriage house conversion. No replacement parking is required. Contact the St. Louis Building Division for current requirements and the Planning and Urban Design Agency for zoning questions. If your home is in a local historic district (Soulard, Lafayette Square, etc.), you'll need a Certificate of Appropriateness before building.
What is the St. Louis City home business permit process?
St. Louis does not require a separate home occupation permit, but home businesses must comply with zoning code restrictions: no customers visiting the premises in residential zones A-E, no exterior signage, no non-resident employees, and no more than 25% of floor area used for business. If you plan to operate a business requiring a state or city license (e.g., daycare, food service, professional services), contact the St. Louis License Collector for applicable license requirements.
How does St. Louis handle short-term rentals like Airbnb?
St. Louis requires an STR license ($200/year) for rentals of less than 31 consecutive days. Both hosted (room rental while owner is present) and whole-home rentals may be allowed depending on the zone. All listings must include the license number. St. Louis imposes a Hotel/Motel Guest Tax on STR revenues in addition to Missouri state sales tax. Contact the St. Louis License Collector at (314) 622-4111 for current licensing requirements.
My home is in the Soulard Historic District — what does that mean for renovations?
Soulard is one of St. Louis's most celebrated historic neighborhoods, designated as both a local historic district and a National Register Historic District. For exterior changes (including additions, window replacements, siding, fences, roofing material changes, and ADU construction visible from public right-of-way), you must obtain a Certificate of Appropriateness from the St. Louis Preservation Board before beginning work. Interior changes do not require Preservation Board review. Applications are reviewed at monthly Preservation Board meetings. Contact the Cultural Resources Office at (314) 622-3400.
Source: St. Louis Building Department — Solar Panel Permits. Last verified April 6, 2026. View source