Deck Permit in Boston, Massachusetts

Permit required?

Sometimes, depending on the project.

Typical threshold: detached decks not more than 30 inches above grade and under 200 sq ft that do not serve an exit door may be exempt.

When a permit is usually needed

For all attached decks and detached decks over 200 sq ft or more than 30 inches above grade

Permit cost and what affects it

Fees are set by the locality and are not published here. See the official fee schedule or contact the office for current amounts.

Permit costs generally depend on the project valuation, the scope of work, and the inspections required. Ask the office how the fee is calculated for your specific project.

Where to apply

• Official permit page
• Permit portal

Frequently asked questions

Do you need a deck permit in Boston?

Under Massachusetts 780 CMR a freestanding deck not attached to the dwelling that is not more than 30 inches above grade and does not exceed 200 square feet may be exempt from the building permit requirement. Any deck attached to the house or above 30 inches above grade requires a building permit from Boston ISD. The typical threshold is detached decks not more than 30 inches above grade and under 200 sq ft that do not serve an exit door may be exempt. Always confirm with the office before starting.

How much does a deck permit cost in Boston?

Fees are set by Boston and are not published here. Contact the office for current amounts.

How long does a deck permit take in Boston?

Processing time for a deck permit in Boston varies by workload and project scope. Contact the Inspectional Services Department for a current estimate.

Where do you apply for a deck permit in Boston?

You can apply through the Boston permit portal or contact the Inspectional Services Department directly. The links are listed on this page.

Official sources

• https://www.boston.gov/departments/inspectional-services
• https://www.boston.gov/boston-permitting