Construction hours in St. Louis, MO — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Construction noise in St. Louis is generally permitted 7 AM to 7 PM Monday through Saturday, with Sunday and holiday work requiring special permission. SLRC 15.42 prohibits construction impact noise outside these hours in residential zones.
Under St. Louis Revised Code 15.42.050, construction, demolition, and heavy equipment operations that produce impact noise, engine noise, or amplified communication are restricted to 7:00 AM through 7:00 PM Monday through Saturday in residential districts. Sunday and legal holiday construction requires a special permit from the Building Division of the Department of Public Safety (1200 Market Street, Room 425). Emergency utility and infrastructure work by Ameren Missouri, Spire, or Metropolitan Sewer District (MSD) is exempt. Large redevelopment projects near the Gateway Arch, Washington University Medical Campus, and Cortex Innovation District frequently secure extended-hours permits. Violations carry fines of $200 per day and can trigger a stop-work order. The city has stepped up enforcement in neighborhoods experiencing heavy infill construction such as Botanical Heights, The Grove, and Tower Grove South.
Stop-work order plus $200 per day fine. Repeat violators may have building permit privileges suspended.
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