How Much Does it Cost to Build a Deck in CT?

April 30, 2025

If you're planning to upgrade your backyard, one of the first questions you might ask is: How much does it cost to build a deck in Connecticut? The short answer: most decks in CT range from $25 to $70 per square foot, depending on materials, size, and design complexity. That means a standard 300-square-foot deck can range anywhere from $7,500 to over $20,000. But the real answer depends on your vision, and we're here to help you understand what goes into that number.


In this guide, we'll walk you through all the factors that influence deck construction costs, what options are available, and how to make the right choice for your home.


Factors That Affect the Cost of a Deck in CT

Not all decks are created equal. The final price tag depends on several components:

  • Materials – Composite, pressure-treated wood, PVC, metal framing, and hardwoods like ipe or mahogany all come at different price points.
  • Size – Naturally, the larger the deck, the higher the cost. Square footage plays a major role.
  • Design Complexity – Multi-level decks, custom inlays, curved edges, stairs, and railing systems add to both labor and materials.
  • Labor Costs – Professional labor in Connecticut typically ranges from $15–$35 per square foot, depending on experience and complexity.
  • Permits & Inspections – Most towns in CT require building permits, which may cost between $150–$500 depending on your location.
  • Site Conditions – Is the site level? Will we need to remove existing structures or excavate for footings? These factors can affect both time and cost.


Let’s break down some of these major elements:


Materials, Size, Complexities, Labor, Permits, and Additional Features


Materials:

  • Pressure-Treated Wood: Most affordable at around $25–$35 per sq ft installed.
  • Composite (e.g., TimberTech, Trex): Low maintenance, long-lasting, runs around $40–$60 per sq ft.
  • PVC: Similar to composite but fully synthetic—$50–$70 per sq ft.
  • Hardwoods (Ipe, Mahogany): Gorgeous but costly—$60–$80+ per sq ft.
composite vs wood decks

Size & Layout:

A small 200 sq ft ground-level deck built with basic pressure-treated wood may cost $5,000–$10,000. However, most of our projects use higher-end materials like composite, PVC, or  exotic hardwoods, which can bring the cost closer to $12,000–$20,000+ for the same size deck. For a larger 500 sq ft elevated deck with stairs, composite decking, and custom railings, pricing typically ranges from $25,000 to $40,000+, depending on the design and features.


Design & Complexity:

Add-ons like:


All of these require more craftsmanship, more materials, and more time.


Labor in CT:

Labor makes up a significant portion of deck cost. Expect $4,500–$10,000+ in labor for a standard-size deck. Custom work—especially with exotic materials or challenging layouts—can increase that further.


Permits:

Each town in Connecticut has unique permit requirements, but most building departments charge $150–$500 for residential deck construction permits.


Additional Features:

  • Railings: Basic wood rails are cheaper; Feeney cable or aluminum systems are premium.
  • Stairs: More stairs = more cost, especially on elevated decks.
  • Inlays & Lighting: Add elegance—and cost.


How to Choose the Right Contractor

Your deck is only as good as the team building it. Choosing the right contractor can mean the difference between a smooth experience and a stressful one. Here’s what to look for:

  • Licensing & Insurance – In Connecticut, always verify your contractor is HIC-licensed and fully insured.
  • Industry Accolades - All the high quality deck material manufacturers like Timbertech, Trex, and Dekorators have certifications they award to their preferred installers.
  • Experience – Look for a team that specializes in outdoor construction—not just general carpentry.
  • Portfolio – Ask for photos of past work and customer testimonials.
  • In-House Crews vs. Subcontractors – At Outdoor Space Builders, our in-house craftsmen handle every step of the project, ensuring quality and consistency.
  • Transparent Pricing – You should receive a detailed estimate outlining labor, materials, and expected timelines.


READY TO START PLANNING YOUR DREAM DECK?

So, what does it cost to build a deck in CT? It depends—but knowing your options and working with a trusted builder can help you make a confident, informed decision.


At Outdoor Space Builders, we specialize in high-end, fully customized decks designed to match your style, budget, and lifestyle. Whether you’re dreaming of a low-maintenance composite deck or a sprawling hardwood masterpiece, we’ll guide you from the first sketch to the final screw—with transparency, craftsmanship, and care.


Ready to start planning your dream deck?  Contact us today.