St. Charles County, MO Property Maintenance: Property Blight (2026)

When the code official identifies unsafe conditions under the Property Maintenance Code, St. Charles County serves a Notice of Unsafe Structure under Section 500.520. The notice does three things at once. It lists the specific defects in the structure or building that constitute the unsafe conditions, so the owner can see exactly what has to be addressed. It declares the structure or building a public nuisance, which is the legal finding that supports everything that follows. And it starts two separate clocks.

The first deadline concerns occupancy. The notice orders the structure or building vacated by the 15th day following service of the notice. Where the building is imminently dangerous, the county does not wait out those 15 days and requires immediate vacation, with the openings secured on an accelerated schedule.

The second deadline concerns the fix. Substantial work on repairs must begin, or, where repairs would be unreasonable, demolition must be completed, no later than the 30th day following service. The asymmetry is worth noting: for the repair path the owner only needs substantial work underway by day 30, while the demolition path has to be finished by that date. Whether repair is treated as unreasonable turns on cost, with the county's threshold set where repair would exceed 75 percent of the structure's assessed value.

The county does not lose its remedy when an owner ignores the schedule. It can carry out the repair or the demolition itself and bill the owner for what the work costs, and an unpaid bill does not remain an ordinary debt. It becomes a special tax lien against the property, standing as a first lien and collected in the same manner as property taxes, which means it stays with the land and surfaces whenever the parcel is sold or refinanced.