Retaining walls over 4 feet tall in Cambridge require engineered drawings and a building permit; walls over 2 feet count toward fence height if topped by a fence.
Retaining walls in Cambridge are regulated under the Massachusetts State Building Code (780 CMR) and the Cambridge Zoning Ordinance. Any retaining wall over 4 feet measured from the bottom of the footing to the top of the wall requires engineered drawings stamped by a Massachusetts licensed Professional Engineer and a building permit from Inspectional Services. Walls over 6 feet also require a guardrail on top. Retaining walls over 2 feet tall count toward the combined fence height if a fence is placed directly on top, meaning a 3-foot wall with a 4-foot fence totals 7 feet and exceeds the by-right zoning limit. In flood hazard areas along the Charles and Alewife Brook, walls may require Conservation Commission review under the Wetlands Protection Act. Drainage behind the wall must be managed to prevent water discharge onto neighboring property.
Contact your local code enforcement office for specific penalty information.
Cambridge, MA
Cambridge enforces numerical decibel limits: 60 dBA day and 50 dBA night at residential receptors, with a 5 dBA penalty for tonal or impulsive sounds.
Cambridge, MA
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Cambridge, MA
Cambridge banned gas-powered leaf blowers in 2024, requiring all landscapers and residents to switch to electric models, with time and decibel restrictions r...
Cambridge, MA
Outdoor music events in Cambridge require a one-day entertainment license from the License Commission, with end times typically capped at 10 PM on weeknights...
Cambridge, MA
Cambridge enforces strict industrial and commercial noise limits: 60 dB days and 50 dB nights at residential property lines, aligned with MassDEP Policy 90-001.
Cambridge, MA
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Side-by-side rule comparisons with other cities in Middlesex County.
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