Lot coverage ratios in Bristol County zoning districts typically cap impervious coverage at 40 to 60%. MA Stormwater Standards add post-construction treatment for larger disturbances.
Bristol County municipalities limit lot coverage through zoning bylaws — typically 40 to 60% impervious coverage in residential districts, 60 to 80% in commercial zones. Coverage calculations include primary structures, accessory buildings, driveways, patios, and paved walkways. Permeable pavers may receive partial credit depending on local bylaw (Fall River, New Bedford, Dartmouth treat permeable pavers with 50% credit in some districts). Larger projects disturbing 1+ acre trigger MA Stormwater Standards and DEP/EPA NPDES Construction General Permit. Coastal properties in Dartmouth, Westport, Fairhaven, and Swansea face additional Conservation Commission review under MGL c. 131 §40 (Wetlands Protection Act) for work within 100 ft of wetland resources. Lot coverage variances require ZBA approval.
Exceeding lot coverage: correction order. Required removal of impervious surface. Fines $200 to $1,000. Stormwater violations: MassDEP enforcement possible.
Bristol County, MA
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Bristol County, MA
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Bristol County, MA
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Somerset, MA
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Bristol County, MA
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Bristol County, MA
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See how Somerset's lot coverage limits rules stack up against other locations.
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