Deck Building Cost in Boston, MA (2026)
Updated October 2026 · Boston, MA · index 1.22
How much does it cost to build a deck in Boston? For a 300 sq ft deck with pressure-treated wood, homeowners in Boston, MA pay about $13,700 on average, and most quotes land between $9,500 and $18,000 — $32 to $60 per sq ft. The price covers plans and the permit, footings, a framed and flashed structure, the deck boards, railing, one set of stairs, fascia and cleanup.
The deck building price in Boston runs 22% above the U.S. average: construction labor in the Boston area runs 35% above the national mean, materials 3% above. The same job averages $11,300 nationally and about $12,900 at the Massachusetts statewide index.
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Deck building price in Boston by decking material
What a 300 sq ft deck costs in Boston with each decking material, installed:
| Option | Average · range |
|---|---|
| Pressure-treated woodtreated pine or fir boards, stained and sealed$46 per sq ft | $13,700$9,500 – $18,000 |
| Capped compositehidden fasteners and a picture-frame border$55 per sq ft | $16,500$11,700 – $21,200 |
The least expensive option in Boston is pressure-treated wood, at about $13,700; capped composite averages $16,500, 1.2 times as much.
Cost to build a deck in Boston by size
With pressure-treated wood, priced for Boston, MA:
| Size | Average · range |
|---|---|
| A 200 sq ft deck$49 per sq ft | $9,850$6,750 – $13,000 |
| A 300 sq ft deck$46 per sq ft | $13,700$9,500 – $18,000 |
| A 400 sq ft deck$44 per sq ft | $17,600$12,200 – $22,900 |
Some costs stay the same whatever the size — plans, permit and layout, one set of stairs (4 steps), final inspection and cleanup — so a bigger job costs less per unit: $44 per sq ft for a 400 sq ft deck against $49 for a 200 sq ft deck.
What a deck building in Boston includes
Line by line, the $13,700 average for a 300 sq ft deck breaks down like this: 47% labor, 53% materials and equipment.
| Line | Low – high |
|---|---|
| Plans, permit and layout | $450 – $1,350 |
| Ground prep, fabric and gravel | $270 – $670 |
| Footings below the frost line | $500 – $1,000 |
| Flashed ledger on the house | $300 – $590 |
| 6x6 posts | $340 – $670 |
| Beams | $300 – $590 |
| Joist framing with hangers | $1,750 – $2,950 |
| Deck boards | $1,600 – $2,400 |
| One set of stairs (4 steps) | $630 – $1,250 |
| Railing | $2,300 – $4,000 |
| Fascia and skirting | $440 – $1,050 |
| Final inspection and cleanup | $180 – $450 |
| Stain and seal, two coats | $400 – $940 |
Each line is the price book's U.S. rate for that step, scaled by 0.74 to the installed price published sources give for the whole job (see how these prices are built), times Boston's index of 1.22; permit fees are not scaled.
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What affects deck building prices in Boston
Labor and materials in Boston
Construction wages in the Boston metro run 27% above the U.S. mean (BLS, May 2025), and specialty-contractor pay in the city's county moves that up by 6%, to 35% above the national mean. Materials in the area's ZIP codes price 3% above the national average. Together they give Boston a construction cost index of 1.22.
Where Boston sits in Massachusetts
Boston is the most expensive of the 7 Massachusetts cities in our index, against a statewide index of 1.15. Springfield is the least expensive at 1.09.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Boston ranks 25th from the most expensive. The job that averages $13,700 here averages $11,300 at the national rate.
Frost depth in Massachusetts
Deck footings go below the frost line, or they heave by the second spring. The typical code frost depth in Massachusetts is about 40 in. — deep holes, more concrete and more digging time than in the South. Your building department sets the exact figure.
The deck code in Massachusetts
Decks here are built to the 780 CMR, Massachusetts State Building Code, 10th Edition — residential (2021 IRC with Massachusetts amendments). Guards are required at 36 in. where the deck is more than 30 in. up, and stair risers can be up to 8.25 in. Stairs: risers up to 8¼ in. on treads at least 9 in. deep (Massachusetts's amendment to R311.7.5); the IRC's 7¾ and 10 are the stricter figure where an inspector asks for it.
What decks are built of in Massachusetts
Most used on decks in New England: treated pine, then capped composite, then PVC.
Sales tax in Massachusetts
Massachusetts's base state sales tax is 6.25%, and cities and counties can add their own. How it applies to a home-improvement contract varies, so ask whether a quote includes it. Prices on this page are before tax.
What a Boston contractor will ask before quoting
- Reuse the frame or rebuild?
- Height, railing style and stairs
- Board brand and color
Deck building cost in other Massachusetts cities
A 300 sq ft deck with pressure-treated wood averages $13,700 in Boston; $13,300 in Cambridge, $13,300 in Newton, $13,600 in Brookline.
| City | Average · range |
|---|---|
| Cambridge, MA3% less | $13,300$9,200 – $17,400 |
| Newton, MA3% less | $13,300$9,200 – $17,400 |
| Brookline, MA1% less | $13,600$9,400 – $17,800 |
| Lowell, MA4% less | $13,200$9,100 – $17,200 |
| Worcester, MA9% less | $12,500$8,650 – $16,300 |
| Springfield, MA11% less | $12,300$8,500 – $16,000 |
deck building price in Boston: questions
How much does it cost to build a deck in Boston, MA?
About $13,700 for a 300 sq ft deck with pressure-treated wood, and most Boston quotes fall between $9,500 and $18,000. That is 22% above the U.S. average, where the same job averages $11,300.
What is the deck price per square foot in Boston?
$32 to $60 per sq ft, about $46 on average with pressure-treated wood. Smaller jobs cost more per unit, because the fixed costs are spread over less.
How much is a 400 sq ft deck in Boston?
$12,200 to $22,900, about $17,600 on average, with pressure-treated wood — $44 per sq ft.
Do you need a permit for deck building in Boston?
Yes — a new deck needs a permit nearly everywhere, Boston included. In Massachusetts, decks follow the 780 CMR, Massachusetts State Building Code, 10th Edition — residential (2021 IRC with Massachusetts amendments). The prices on this page carry $450–$1,350 for plans, permit and layout.
Does the price include sales tax in Massachusetts?
No. The prices here are before tax; Massachusetts's base state rate is 6.25%, plus any local rate.
What decking do people choose in Massachusetts?
Most used on decks in New England: treated pine, then capped composite, then PVC.
Other home projects in Boston
Deck building cost in Massachusetts
How these prices are built
Every price on this page comes from JobFlex's contractor price book: what a homeowner pays a licensed contractor for each step of the job, as a U.S. national average per unit, with the contractor's overhead and profit included and sales tax left out. The deck building is priced step by step, then multiplied by Boston's construction cost index of 1.22.
Where the price book's steps for an option add up to more than 20% over the installed price a published source gives for the whole job, every step but a permit fee is scaled down to the middle of that range: pressure-treated wood × 0.74 (HomeGuide 2026: $25–$50 per sq ft); capped composite × 0.80 (Ergeon 2026: $30–$60 per sq ft).
The index weighs local construction wages (BLS Occupational Employment and Wage Statistics, May 2025) at 60% and the area's material prices (Craftsman ZIP-area factors) at 40%. Published indices for Boston, each on its own base: RSMeans residential 1.12, HUD 1.23, Craftsman 1.29. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Boston build quotes like these with JobFlex's Deck Studio.
- HomeGuide 2026: pressure-treated deck $25-$50/sqft installed, labor $15-$30/sqft
- Ergeon 2026: composite deck $30-$60/sqft installed
- HomeGuide 2026: composite railing $25-$60/lf, aluminum $50-$200/lf installed