Grading & Drainage: Boston vs Chelsea
How do grading & drainage rules compare between Boston, MA and Chelsea, MA?
Boston and Chelsea have similar restriction levels.
Boston, MA
Suffolk County
Boston requires grading and drainage plans for construction projects to ensure proper stormwater management and prevent damage to adjacent properties. The BWSC reviews drainage connections and the Inspectional Services Department approves grading plans. Projects must maintain positive drainage away from foundations and not redirect runoff onto neighboring properties.
View full Boston rules →Chelsea, MA
Suffolk County
Suffolk County cities require grading permits under 780 CMR Chapter 18 (state building code foundations chapter). Boston Inspectional Services requires permits for excavation/fill exceeding 50 cubic yards. Drainage must not be directed onto neighboring properties per common-law rules and Chelsea/Revere/Winthrop local ordinances. Grading near wetlands triggers Conservation Commission jurisdiction.
View full Chelsea rules →Key Facts Comparison
| Fact | Boston | Chelsea |
|---|---|---|
| Foundation Grade | 6-inch drop in first 10 feet | - |
| Drainage Permit | BWSC site plan review required | - |
| Adjacent Property | Cannot redirect runoff to neighbors | - |
| Combined Sewers | Separation may be required | - |
| Incentive | Stormwater fee credits for green infrastructure | - |
| State Code | - | 780 CMR Chapter 18 |
| Boston Threshold | - | 50 cubic yards |
| Revere Fill Permit | - | 20+ cubic yards |
| Retaining Wall | - | Permit over 4 ft |
| Drainage Rule | - | MA 'reasonable use' |
Highlighted rows indicate differences between cities.
Boston FAQ
Do I need a permit for grading work in Boston?
Yes. Significant grading work requires ISD permits, and any project connecting to the city drainage system needs BWSC site plan review and approval. Fill operations also require separate permits from ISD.
Can I redirect drainage on my Boston property?
You may grade your property for proper drainage but cannot redirect stormwater onto neighboring properties. Drainage must flow toward approved city facilities, and BWSC approval is required for storm drain connections.
Chelsea FAQ
Can I regrade my yard without a permit in Boston?
Minor regrading under 50 cubic yards is usually exempt, but work within 5 feet of a property line, in a flood zone, or within Conservation Commission jurisdiction needs approval.
My neighbor regraded and now water floods my yard. What can I do?
You can sue under MA 'reasonable use' doctrine (DeSanctis case) and file a code complaint. Photograph before/after and document flooding dates.
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