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 has not confirmed its solar installation mandate status from an official source. 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
Solar Mandate Status in St. Louis: Whether a solar installation mandate applies in St. Louis has not been confirmed from an official source. Contact the the building department to verify current mandate requirements before beginning your solar installation project.
HOA Restrictions
HOA Restrictions on Solar in St. Louis: State law governs HOA authority to restrict solar installations. Contact the the planning department or your HOA directly for the most current information.
Permit Process
Permit Process in St. Louis: A building permit is required for all solar PV and solar thermal installations. Apply through the the building department. Contact them through their official website for direct contact information. Utility interconnection approval is typically required separately from the building permit.
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