A Missouri county is moving toward mandatory spacing requirements between short-term rentals and a licensing fee structure that could reset the economics for operators across the St. Louis metro area.

The proposal follows a pattern emerging across Missouri that spent years without oversight.

According to local affiliate “Fox 2,” the St. Charles County Council has proposed the new rules and restrictions for short-term rental homes, such as Airbnb and Vrbo properties, that would create a licensing and inspection program to regulate and track properties.

The proposal, Bill 5490, calls for a cap on the number of guests who could stay overnight and the number of vehicles parked at the property, along with a 600-foot buffer between short-term rentals to prevent overcrowding in neighborhoods, the outlet reported.

If passed, the county would issue short-term rental licenses on a first-come, first serve basis.

Anyone who tries to operate a short-term rental in the area with a license would face fines up to $500 or 30 days in jail.

Now local governments are catching up with permit programs, business licenses, and geographic restrictions designed to prevent STR clusters in residential neighborhoods.

St. Charles County’s approach puts distance between properties at the center — a strategy that protects incumbent operators but effectively rations new supply.

Spacing rules work differently than permit caps.

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They don’t limit the absolute number of rentals, but they do limit where the next one can go.

That makes existing inventory more valuable and new acquisitions harder to pencil. For investors scouting deals in unincorporated parts of the county, the window to enter without restrictions is closing fast.

The county hasn’t published fee amounts yet, but comparable Missouri jurisdictions charge between $130 and $500 annually.

Operators with multiple properties should model what a 500-foot or 1,000-foot spacing rule would do to their expansion pipeline.

If the county adopts Illinois-style separation requirements, some neighborhoods will go off-limits overnight.