Construction hours in Gaithersburg, MD — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Gaithersburg limits construction noise to daytime hours consistent with Montgomery County regulations. Residential construction is generally permitted Monday through Saturday with restrictions on early morning, evening, and Sunday work. Special permits may extend hours for large projects along the I-270 corridor.
Construction noise in Gaithersburg is regulated under both City Code Chapter 15 and Montgomery County noise standards. Residential construction is permitted Monday through Friday from 7 AM to 5 PM and Saturday from 9 AM to 5 PM. Sunday and federal holiday construction is generally prohibited in residential zones. Commercial construction along the I-270 corridor and in mixed-use zones may have extended hours with proper permitting from the city. Interior renovation work that does not produce exterior noise may continue outside standard hours. All construction equipment must have functioning mufflers. Pile driving and demolition have additional restrictions and may require separate noise mitigation plans. Emergency utility repairs by WSSC Water and Pepco are exempt from hour restrictions. The city issues stop-work orders for persistent violations of construction hour limits.
Violations carry fines up to $500 per occurrence. Repeat offenders may face stop-work orders. County enforcement may impose separate penalties under Chapter 31B.
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Side-by-side rule comparisons with other cities in Montgomery County.
See how other cities in Montgomery County handle construction hours.
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