ADU Permit Requirements in Boston, Massachusetts

Permit Process

Follow these steps to submit your permit application through Boston Inspectional Services Department.

1. 1

   Pre-Application Review

   Consult with Boston Zoning Board of Appeals (if needed) and Inspectional Services about ADU proposal and Section 3A compliance

   You'll need: Title Insurance Commitment

2. 2

   Zoning Verification

   Verify compliance with Massachusetts Section 3A requirements and Boston zoning code. Review for historic district overlays and neighborhood association concerns.

   You'll need: Zoning Compliance Letter

3. 3

   Submit Plans and Permit Application

   Submit complete permit application with architect-sealed drawings, site plan, egress plan, and all required documentation to Inspectional Services

   You'll need: Building Permit Application, Architectural Plans, Site Plan, Egress Plan

4. 4

   Plan Examination

   Building inspector and zoning examiner review plans for compliance with Building Code, energy code, and zoning requirements

5. 5

   Address Examiner Comments

   Submit revised plans and supplemental documents to address building inspector comments and corrections

6. 6

   Pay Permit Fees

   Pay calculated fees based on construction valuation. Fees must be paid before permit issuance.

7. 7

   Permit Issuance

   Receive building permit and construction can begin

8. 8

   Construction Inspections

   Schedule and pass required inspections: foundation, framing, electrical, plumbing, mechanical, and final occupancy inspection

Fees and Timeline

Authority Sources

Data on this page is sourced from official records published by the permitting authority. Always verify requirements directly before submitting.

Frequently Asked Questions

Do I need a adu permit in Boston?

Yes. Boston requires a adu permit for this type of project. Submitting without a permit may result in fines, required removal, or complications when selling your property.

How long does adu permit approval take in Boston?

Processing times in Boston vary depending on project complexity and current review volume. The process involves 8 steps. Contact Boston Development Services for current timelines.

What documents are required for a adu permit in Boston?

Boston requires 6 documents including Building Permit Application, Architectural Plans, Site Plan, Title Insurance Commitment, and others. See the full list above for details.

What happens if I build without a adu permit in Boston?

Building without a permit in Boston can result in stop-work orders, fines, required removal of work, difficulty selling your property, and insurance complications. It is strongly recommended to obtain proper permits before starting work.

Can PermitMagic help prepare my adu permit submission in Boston?

Yes. PermitMagic generates a submission-ready packet tailored to Boston's requirements, including a document checklist, workflow steps, and authority references. Start a permit plan to get your personalized packet.

How much does a adu permit cost in Boston?

ADU permit fees in Boston typically range from $2,250 to $13,200, depending on project scope. Fees may include building permit, plan review, and technology surcharges. Verify current fees with Boston.

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