Construction hours in Montgomery County, MD — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Montgomery County limits construction noise in residential areas to 7 AM to 9 PM Monday through Friday and 9 AM to 9 PM on weekends under Chapter 31B. Emergency and public utility work is exempt. Permits required for extended-hour construction projects.
MoCo Code Chapter 31B restricts construction, demolition, and renovation noise in or adjacent to residential zones. Permitted hours are 7 AM to 9 PM Monday through Friday and 9 AM to 9 PM on Saturdays, Sundays, and holidays. Construction outside these hours requires a noise waiver from the Department of Environmental Protection. Emergency repairs to utilities, roads, and critical infrastructure are exempt from hour restrictions. Equipment must have functioning mufflers and noise-dampening features. Large-scale projects near residential communities in areas like Silver Spring, Bethesda, and Wheaton frequently face additional conditions imposed during the site plan approval process. The Department of Permitting Services (DPS) coordinates with DEP on construction noise waiver applications. Complaints about construction noise should be directed to MC311.
Construction outside permitted hours without a waiver: civil citation with fines up to $500 per day. Repeat violations may trigger stop-work orders from DPS.
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