How Much Does It Cost to Build a Deck in Massachusetts?

Most Massachusetts decks land between $30 and $65 per square foot installed. Here's a 2026 breakdown of materials, labor, permits, and frost footings from a Plymouth builder.

If you're pricing a new deck in Massachusetts, here's the honest answer up front: most decks we build on the South Shore land between $30 and $65 per square foot installed, depending on material and site. For a typical 300-square-foot backyard deck, that's roughly $9,000–$12,000 in pressure-treated lumber, or $14,000–$20,000 in composite.

Those numbers cover the whole job: design, permits, demolition of an old deck if needed, frost-depth footings, framing, decking, railings, and stairs. Here's how the budget actually breaks down, and where Massachusetts adds wrinkles you won't see in national cost guides.

2026 Deck Prices by Material

• Pressure-treated wood: $30–$40/sq ft: the budget workhorse. Plan to stain or seal every 2–3 years in our climate.
• Composite (Trex, TimberTech): $45–$65/sq ft: more up front, almost zero maintenance, 25–50 year warranties. The most popular choice with our Plymouth-area clients.
• Exotic hardwood (ipe, mahogany): $55–$75+/sq ft: beautiful and extremely durable, but material prices swing and installation is slower.

What Drives Deck Cost in Massachusetts

Frost footings (the big one)

Massachusetts code requires footings below the frost line: 48 inches in most of the state. Proper footings cost more than the shallow pads national averages assume, but they're why our decks don't heave every spring. Ledger flashing and structural hardware are inspected items here too.

Height, stairs, and railings

A ground-level platform is the cheapest build. Every foot of height adds framing, longer stair runs, and code-required guardrails. Railings alone run $50–$150 per linear foot depending on material: see our custom stairs and railings work for what's possible.

Permits and inspections

Plymouth and most surrounding towns require a building permit for a new deck, typically $50–$300 based on project value. A licensed contractor handles drawings, the application, and both inspections (footings and final). If a contractor suggests skipping the permit, walk away: it can void your homeowner's insurance and complicate a sale.

Real Examples From Our Projects

A backyard deck with hand-built stairs in Easton extended the home's living space outdoors with composite decking sized for entertaining. On the larger end, our custom pool pavilion paired a wraparound deck with a covered outdoor room. Browsing finished projects is the fastest way to calibrate your own budget.

How to Keep the Budget in Check

• Keep the shape simple: rectangles cost less per square foot than multi-level or angled designs.
• Mix materials: composite decking with aluminum balusters often beats an all-premium build by thousands.
• Build in the shoulder season: fall and early-spring scheduling is more flexible than June.
• Get an itemized quote so you can see where every dollar goes, and compare bids fairly.

Get a Real Number for Your Yard

Online ranges only get you so far: footing conditions, height, and material choices swing the price. MP & Son Construction builds decks across Plymouth and 27+ South Shore towns, fully licensed and insured, with workmanship backed by a written warranty. Request a free on-site estimate and we'll walk the site, talk through materials, and hand you an itemized quote, usually within 24 hours.