ADU eligibility needs parcel zoning and project facts for O'Fallon, MO
O'Fallon, MO ADU checks route through official city planning, zoning, building, or development-services sources before relying on lot-level eligibility.
What this tells youComputed rule answer
How precise this isComputed rule answer
Official data checkedO'Fallon official ADU/building path
Next stepCheck parcel rules and project scope before design, purchase, or contractor conversations.
Primary sourceOfficial planning/building path
VerifyADU/accessory-use rules, zoning district, lot standards, permit path