ADU Permit Fees & Costs in Boston, Massachusetts
Everything you need to apply for a adu permit in Boston, Massachusetts — documents, fees, steps, and a downloadable submission packet.
Key Facts
- Permit required
- Yes
- Submission method
- Online
- Typical fee range
- $2,250 – $13,200
- Review time
- Varies by jurisdiction
- Inspections
- 8 inspections required
Limited Data Available
Some information on this page has not been fully verified. We're working to improve data quality. Always verify with Boston directly.
Estimated Total Fees
$2,250 – $13,200
Range based on typical residential solar PV system. Actual fees depend on project valuation and system size.
| Fee Component | Range | Confidence |
|---|---|---|
| ADU Permit Fee[1][2] Permit fees based on estimated construction cost and building valuation. Typical fee is $5-$10 per $1,000 of valuation. All fees payable to City of Boston. | $1,500 – $8,000 | ✓ |
| Plan Review Fee[3][4] Plan review fee is typically 50-65% of the permit fee. | $750 – $5,200 | ✓ |
| Estimated Total | $2,250 – $13,200 |
Fees shown as ranges. Always verify the exact amount with Boston before submission. Additional fees may apply for expedited review or resubmittals.
Avoid rejections — generate a submission-ready packet
Get a personalized ADU permit packet for Boston, Massachusetts — tailored to your project details.
- Required forms: Building Permit Application, and more
- Pre-filled templates: Permit Cover Sheet
- Fee breakdown: $750–$8,000 estimated total
- Step-by-step Boston Inspectional Services Department portal submission guide
- Inspection prep checklist (8 items)
- Personalized for your specific project details
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Required Documents
Boston requires the following documents for this permit application.
Building Permit Application
Completed Boston Form 1 (Application for Building Permit) submitted in person at Inspectional Services Department
Architectural Plans
Complete set of architectural drawings signed and sealed by a licensed Massachusetts architect, including floor plans, elevations, sections, and details
Site Plan
Site plan showing property boundaries, setbacks, building footprint, parking areas, existing and proposed utilities, and lot dimensions
Title Insurance Commitment
Current title insurance commitment or deed showing legal ownership
Zoning Compliance Letter
Statement from owner certifying compliance with Massachusetts Section 3A zoning requirements and local ADU regulations
Egress Plan
Plans showing compliant emergency egress and means of egress from all habitable rooms per IBC standards
Permit Process
Follow these steps to submit your permit application through Boston Inspectional Services Department.
- 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
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
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
Plan Examination
Building inspector and zoning examiner review plans for compliance with Building Code, energy code, and zoning requirements
- 5
Address Examiner Comments
Submit revised plans and supplemental documents to address building inspector comments and corrections
- 6
Pay Permit Fees
Pay calculated fees based on construction valuation. Fees must be paid before permit issuance.
- 7
Permit Issuance
Receive building permit and construction can begin
- 8
Construction Inspections
Schedule and pass required inspections: foundation, framing, electrical, plumbing, mechanical, and final occupancy inspection
Authority Sources
Data on this page is sourced from official records published by the permitting authority. Always verify requirements directly before submitting.
Verified February 15, 2026
Verified February 15, 2026
Verified February 15, 2026
Verified February 15, 2026
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.
Related Permits
Other permits in Boston
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