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Decks & Porches · Boston, MA

Decks & Porches in Boston, Massachusetts

Compare contractors serving Boston, Suffolk County — call them directly, or send one request and let qualified pros come to you.

50 contractors serving Boston — including 23 based in town.

Contractors serving Boston

Decks & Porches in Boston — what to know

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Permits for Boston deck projects run through the Inspectional Services Department (ISD) at 1010 Massachusetts Ave. Any deck attached to the house or elevated more than 30 inches above grade requires a building permit under 780 CMR. ISD plan review for a standard residential deck takes roughly two to three weeks; more complex projects in dense neighborhoods can run longer.

Footings must reach at least 48 inches below grade to clear the frost line across Suffolk County. Inspectors consistently flag ledger-board flashing, guardrail height (minimum 36 inches under 780 CMR), and baluster spacing under 4 inches. Decks near Boston Harbor, the Charles River Esplanade, or any wetland resource area within 100 feet trigger Conservation Commission review under the Wetlands Protection Act before ISD will issue a permit. Exteriors in historic districts like Beacon Hill, Bay Village, or South End Landmark District need Boston Landmarks Commission sign-off before construction.

Permits in Boston

File with Boston ISD for any attached or elevated deck. A typical permit package includes plot plan, framing drawings with ledger detail, and footing specs. Expect one to three weeks for standard review; historic-district projects add the Landmarks Commission step. Conservation Commission filing is required for any work within 100 feet of a wetland resource area, including tidal flats and the Charles.

Typical project cost

Deck construction in Boston runs among the highest in the state, reflecting union-adjacent labor rates, parking and access constraints in dense neighborhoods, and the difficulty of working on attached row houses. Pressure-treated pine decks run roughly $18,000 to $30,000 installed; composite or PVC (Trex, TimberTech, Azek) adds $8,000 to $15,000 to those figures. Full porch enclosures on Victorians in Jamaica Plain or Roxbury routinely run $35,000 to $60,000.

About Boston homes

Boston covers 665,945 residents across roughly 304,000 housing units, most of them pre-World War II row houses, triple-deckers, and attached brownstones in Suffolk County. With a median construction age of 81 years, decks here often mean replacing rotted ledger boards and non-code railings on structures that were grandfathered for decades.

Given how densely the city is built, rear yard decks on Dorchester two-families and South Boston row houses are the most common project type. Farmer's porches on Jamaica Plain Victorians and rooftop deck conversions in the South End are also common, each with its own permitting path through the City of Boston.

Common questions — Decks & Porches in Boston

Do I need a permit for a deck on my Dorchester two-family?
Yes. Any deck attached to the house or over 30 inches above grade requires a building permit through Boston ISD under 780 CMR. Your contractor files the application; ISD does the review and schedules inspections.
My South End townhouse is in a landmark district. Can I still add a rear deck?
You can, but exterior changes visible from a public way need Boston Landmarks Commission approval before ISD will issue the building permit. A deck in a fully enclosed rear yard is typically less scrutinized, but confirm with the Commission before spending on drawings.
My yard backs up to the Charles River in Brighton. Does that affect my deck permit?
Yes. Any construction within 100 feet of the Charles River triggers a Conservation Commission Notice of Intent filing under the Wetlands Protection Act. The Commission reviews it before ISD can issue a building permit, adding several weeks to the process.
How deep do deck footings need to be in Boston?
Footings must extend at least 48 inches below finished grade to clear the frost line in Suffolk County. Concrete Sonotubes or helical piles are both accepted; helical piles are popular on tight Boston lots where excavation equipment can't reach.
What do Boston deck inspectors look at most carefully?
The three items ISD inspectors flag most often are ledger-board flashing (improper flashing causes rot at the house connection), guardrail height (36-inch minimum under 780 CMR for one- and two-family homes), and baluster spacing (must be under 4 inches to prevent a child's head from passing through).
My triple-decker has a second-floor porch that is sagging. What is involved in fixing it?
Structural repair to a second-floor porch still requires a building permit through ISD, even if you are not changing the footprint. Contractors will assess whether the rot is limited to decking boards or has reached the ledger, joists, or posts, as the latter is a significantly larger repair.

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