Construction hours in Baltimore, MD — sometimes called construction noise rules or contractor work-hour ordinances — set when contractors can run power tools, hammers, and heavy equipment.
Maryland's COMAR 26.02.03.03 exempts construction activity from state noise limits during daytime hours, generally 7 a.m. to 10 p.m. Outside those hours, construction must meet residential nighttime decibel limits unless a permit allows otherwise.
COMAR 26.02.03.03 provides that construction noise audible at the property line of a residential receiver is exempt from the state's general decibel ceilings between 7 a.m. and 10 p.m. on weekdays. Outside this window, construction must comply with the applicable nighttime limit (typically 55 dBA in residential zones). The exemption applies only to lawful construction conducted under a valid permit. Local jurisdictions may further restrict construction hours but cannot expand the daytime window beyond the state ceiling. Emergency repairs and public works projects often qualify for separate exemptions issued by MDE.
Nighttime construction without authorization may incur civil penalties up to $10,000 per day, plus stop-work orders from local code enforcement.
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