If you’re a homeowner in Plymouth, Duxbury, Marshfield, Hanover, or anywhere on the South Shore, you may be wondering: “How much does it cost to build a deck or addition?” It’s one of the most common questions we hear at Cranland Carpentry — and the answer depends on several key factors.
Factors That Affect the Cost of a Deck or Addition
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Size and Layout
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A simple 10’x10’ deck will cost significantly less than a wraparound porch or full-scale addition. Larger projects also require more materials, labor, and planning.
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Materials
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Pressure-treated wood is typically the most affordable option, but it requires ongoing maintenance.
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Composite and PVC decking (like TimberTech or Trex) cost more upfront but offer longevity, minimal upkeep, and a modern look.
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Additions may include siding, roofing, insulation, and windows, all of which influence cost.
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Design Features
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Screened-in porches, roofs, or walls add protection and usability but also add cost.
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Railings, built-in benches, or custom trim details increase both material and labor costs.
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Permits & Engineering
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In towns like Cohasset, Hingham, and Marshfield, zoning and building permits may require special approvals or variance requests. Engineering or surveying may also be needed for larger additions.
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Labor & Complexity
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Simple ground-level decks are more straightforward than multi-story additions that tie into your existing roofline.
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Complex projects require more skilled labor and coordination with electricians, plumbers, and other trades.
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Typical Price Ranges in Plymouth County & the South Shore
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Decks: Homeowners can expect $90–$130 per square foot depending on material choice and design complexity.
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Additions (including enclosed decks or porches): Costs vary widely but generally range from $200–$400 per square foot depending on finishes, features, and permitting requirements.
At Cranland Carpentry, we provide transparent, upfront budgets during our pre-construction planning phase, so there are no surprises once the work begins.
Why Cranland Carpentry?
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63 Five-Star Reviews from South Shore homeowners.
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Daily logs and photo updates so you always know where your money is going.
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Locally owned, family-rooted team serving Plymouth, Pembroke, Duxbury, Marshfield, Hanover, Kingston, Cohasset, Scituate, Hingham, and Hanson.
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Projects built to last more than a lifetime.
When it comes to adding a deck or addition to your home, cost depends on size, materials, design, and permitting. By working with a trusted local contractor like Cranland Carpentry, you’ll get a clear plan, transparent pricing, and a project that adds lasting value to your home.
Thinking about a new deck or addition? Contact us today to start planning your project in Plymouth County and the South Shore, MA.