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Boston Permit Guide · 2026

Home Addition Permits
in Boston, MA

Permit fees for a home addition in Boston typically run $550–$2,225. Here's exactly which permits you need, what they cost, and how long MA review takes.

Do you need a permit for a home addition in Boston?

Always — an addition is new structure. Expect full plan review, zoning checks, and multiple inspections in Boston. Permit fees for a typical $111,830 home addition run about $550–$2,225 (valuation-based fee plus plan review), and MA plan review typically takes 3–8 weeks.

Permits you'll likely need

Building

full permit with stamped plans and plan review

Zoning

setback, lot-coverage, and height review

Trade permits

electrical, plumbing, and mechanical rough-ins

Site/grading

excavation and drainage in many jurisdictions

Usually exempt

Nothing meaningful — every part of a home addition runs through permitting. Budget for it up front.

How to get home addition permits in Boston

  1. 1
    Confirm what triggers a permit

    Building, Zoning, Trade permits, Site/grading permits apply when the scope includes full permit with stamped plans and plan review. Cosmetic-only scopes may be exempt.

  2. 2
    Budget the fee

    Plan for $550–$2,225 in Boston — a valuation-based fee on a typical $111,830 project plus plan review.

  3. 3
    Apply with complete documents

    Submit scope, drawings, and contractor license info to the Boston building department. MA plan review typically takes 3–8 weeks.

  4. 4
    Verify it in the bid

    A complete Boston bid lists permit fees as a line item. If a bid omits permits — or suggests skipping them — analyze it before signing.

Home Addition permits in Boston: FAQ

Do I need a permit for a home addition in Boston?
Always — an addition is new structure. Expect full plan review, zoning checks, and multiple inspections in Boston, MA. When in doubt, call the Boston building department before work starts — unpermitted work can block a future sale.
How much do home addition permits cost in Boston?
Expect roughly $550–$2,225 in Boston for a typical $111,830 home addition. Most jurisdictions charge a valuation-based fee of about 0.5–2% of project value, plus plan review and per-trade permit minimums.
How long does a home addition permit take in Boston?
Simple trade permits are often issued over the counter in Boston. Where plan review applies, MA turnaround typically runs 3–8 weeks. Submit complete drawings the first time — resubmittals are the most common cause of delay.
Who pulls the permit — me or my contractor?
Usually your contractor pulls permits for a home addition, and their license is attached to the work. A contractor who asks you to pull an owner's permit for contractor-performed work is shifting liability onto you — treat that as a red flag when reviewing bids.

More Boston permit guides

Home Addition permits in other MA metros

Is your home addition bid fair?

A typical Boston home addition runs $111,830. Check your contractor's bid — permits included — against live 2026 local data, free.

Boston home addition costsAUDIT MY BID

Data sources: Zonda Cost vs Value 2025; Houzz 2024 Cost Guides; BLS OEWS 2023; FRED regional price indices; Reddit homeowner & contractor reports.

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