Construction hours in Baltimore County, MD — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Baltimore County's Title 3 noise code sets no specific countywide construction-hour window. Construction noise is instead governed by Maryland's COMAR daytime dB limits (65 dBA residential, 7 a.m.–10 p.m.), with a stricter 55 dBA cap overnight. Check your municipality for tighter local hours.
Baltimore County Code Title 3 (Noise) addresses 'domestic noise' from human activity and does not fix a specific construction start/stop time countywide. Construction equipment noise is measured under Maryland COMAR 26.02.03: at a residential receiving property the limit is 65 dBA daytime (7 a.m.–10 p.m.) and 55 dBA nighttime (10 p.m.–7 a.m.). Because construction is loud, work generally must be confined to daytime hours to stay under the nighttime cap. Incorporated municipalities within the county may adopt tighter hours, so verify local rules before starting early or late.
Exceeding COMAR dB limits can draw Maryland Department of the Environment enforcement; county domestic-noise violations carry civil penalties up to $500.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Baltimore County's construction hours rules stack up against other locations.
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