Suffolk County, MA Building Setbacks & Zoning: Setback Rules (2026)

Suffolk County does not set setbacks. Boston's Zoning Code is unusual among major cities: it has distinct Article-per-neighborhood provisions (Back Bay Article 27, South End Article 64, Dorchester Article 65, South Boston Article 68, Charlestown Article 42, East Boston Article 53, etc.) with widely varying setback requirements. Dense row-house neighborhoods (Back Bay, Beacon Hill, South End, North End) effectively have zero-lot-line side setbacks as of existing conditions — new construction must match existing fabric. Triple-decker neighborhoods (Dorchester, Roxbury, South Boston) typically require 5-10 foot side setbacks, 15-20 foot front, 20+ foot rear. Single-family zones (West Roxbury, Hyde Park, parts of Dorchester) follow suburban-style setbacks: 20-25 ft front, 10 ft side, 20 ft rear. Chelsea's zoning allows very dense development with minimal setbacks. Revere's single-family zones (Beachmont, Oak Island) use 20/10/20 patterns. Winthrop allows typical New England 25/10/20. Under MGL c. 40A §§6, 10, non-conforming structures have grandfathering protection. Zoning variances require Zoning Board of Appeal hearing with statutory notice — hardship-based standard under MGL c. 40A §10. Corner lot visibility triangles required citywide.