Construction hours and noise in Montgomery County, MD
Construction noise may not exceed 75 dBA unless a noise suppression plan allows more. General limits are 65 dBA by day and 55 at night.
A person last checked these rules on October 20, 2026. This is guidance only, so confirm with Montgomery County before you build.
The details
- DEP enforces the noise ordinance (Chapter 31B).High confidence
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SetbackIQ reads the zoning, flood zone, historic district, and environmental maps for your lot. Then it applies these rules.
Common questions
- What hours can construction happen, and how loud can equipment be in Montgomery County?
- Construction noise may not exceed 75 dBA unless a noise suppression plan allows more. General limits are 65 dBA by day and 55 at night.
Sources
- Montgomery County DEP, Noise brochure (Chapter 31B). Checked 2026-10-21
Daytime: 65 decibels (Weekdays: 7 am to 9 pm; Weekends and holidays: 9 am to 9 pm). Nighttime: 55 decibels... Construction noise may not exceed 75 decibels [unless a Noise Suppression Plan allows more].
Disclaimer: This is general information, not legal or professional advice for any one property. Codes change. SetbackIQ is not a zoning determination, a permit, or a survey, and it does not replace an architect, engineer, or lawyer. Confirm with your building and zoning offices before you build, buy, or sign a contract.