Boston Home Addition Permits 2026

Boston home addition permit fees, plan review, and required inspections for 2026.

Boston Home Addition permit basics

  • Building department: City of Boston Inspectional Services Department (ISD)
  • Department URL: https://www.boston.gov/departments/inspectional-services
  • Permit fee typical: $400 - $3,500 permit fee
  • Plan review + approval: 10-25 business days; plan review 6-10 weeks
  • Inspections required: 6-12 inspections (footing, framing, electrical, plumbing, mechanical, insulation, drywall, final)

Boston Home Addition common issues

Setback compliance, FAR (floor-area ratio), structural review required, sewer/water capacity may need upgrade.

Boston-specific permitting context

Boston ISD requires Construction Supervisor License (CSL) for any structural work. Lead paint compliance (RRP) strict due to age of housing. Hub zone requires extra parking permit for trucks.

Climate factors: Severe winters with deep frost lines; coastal storm exposure; historic housing stock

Massachusetts licensing for Home Addition contractors

Massachusetts Office of Consumer Affairs (Home Improvement Contractor Registration) - required: $150 registration + Construction Supervisor License $150. Board: https://www.mass.gov/orgs/office-of-consumer-affairs-and-business-regulation.

Mechanics lien deadline in Massachusetts: 90 days from last work. Preliminary notice: Notice of contract must be recorded before lien claim.

Boston Home Addition sales tax

Massachusetts sales tax: 6.25% (no local addition). Real property labor exempt. Multiple-quantity threshold reporting requirements for tools and equipment.

Verify with the Massachusetts Department of Revenue.

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