How Much Does It Cost to Build a Deck in Connecticut? (2026 Guide)

“How much does a deck cost?” is the first question almost every homeowner asks us, and it deserves a real answer. So here it is.

Most of the new decks we built across eastern Connecticut in 2026 came in between about $14,000 and $55,000. Smaller jobs like railing replacements cost less. Larger outdoor living projects with extras like Trex RainEscape, lighting, walkways and a finished ceiling underneath ran from about $90,000 to over $110,000.

Below are real projects we built or sold this year, with what was included and what each one cost. Prices are rounded and include materials, labor, permits where needed, and removal and disposal of the old deck.

Real 2026 Deck Projects and What They Cost

Railing replacement in Lisbon: about $6,400

About 65 feet of new white vinyl railings and a matching gate on an existing deck. The deck itself stayed, so no permit was needed.

12×12 deck in Oakdale: about $14,400

Old deck removed and replaced with a new 12×12 deck in Trex Enhance Basics “Saddle” decking, Trex Select white railings with black aluminum balusters, white vinyl fascia, and a short set of 3-step stairs down to the pool.

Pressure-treated replacement deck in Stafford Springs: about $17,900

An old deck of about 19×10 removed and rebuilt in the same size and shape, all in pressure-treated wood, with two sets of stairs, wood railings and lattice around the bottom.

Wood addition with RainEscape in Mansfield Center: about $19,800

A new 16×12 pressure-treated deck section added to an existing deck, with Trex RainEscape and a gutter installed underneath to create a dry space to park below. New concrete piers were also added to support the existing deck.

Second-story deck in Bolton: about $21,900

A roughly 15×12 deck about 80 inches off the ground, with Trex Enhance Basics “Pebble Beach” decking, Trex Select white railings with black aluminum balusters, a picture frame border, picture-framed stair treads, and a 10-step staircase down to the patio.

New 20×12 deck in Ellington: about $23,800

A brand-new 240-square-foot deck about two feet off the ground, with Trex Enhance Naturals “Golden Hour” decking, Trex Select white railings with square white balusters, 3-step stairs, a concrete landing and “Clay” privacy lattice around the bottom.

34×12 upper deck in Coventry: about $44,200

Old deck removed and replaced with a 34×12 upper deck, plus a step-down landing to the garage and stairs to the ground. It has Trex Enhance Naturals “Honey Grove” decking, Trex Select white railings with black aluminum balusters, a double picture frame border, a parting board and Brazilian Walnut privacy lattice.

Replacement deck with walkway in Gales Ferry: about $52,900

Old deck removed and rebuilt in the same footprint: a roughly 26×13 deck about 8 1/2 feet off the ground, with a 13-step staircase, a second set of stairs, and a 4-foot-wide elevated walkway about 22 feet long from the driveway. It has Trex Select “Whiskey Barrel” decking, Trex Select white railings with black aluminum balusters, and white vinyl fascia, with concrete pads at the bottom of the stairs.

Large deck and balcony in Marlborough: about $89,200

A full outdoor living project: the old deck and upper balcony removed and replaced with a larger, angled deck about 24 feet across (about 122 square feet bigger than the old one), a step-up landing to the stairs, and a new 12×4 upper balcony. It has Trex decking, Trex Select white railings with black aluminum balusters, a picture frame border and parting board, Trex RainEscape with a beaded vinyl ceiling underneath, Trex post cap and riser lighting, and a gate.

Large multi-section deck in Lebanon: about $113,000

Old deck removed and replaced with two large deck sections, about 40×20 by the pool and about 26×20 off the back of the house, joined by a 5×22 walkway that steps up between the two levels. It includes a walkway with stairs from the driveway and two more sets of stairs. It has two-tone Trex Enhance Naturals decking, with “Golden Hour” main boards and a “Cinnamon Cove” picture frame border and parting board, plus Trex railings and white vinyl fascia.

What Makes One Deck Cost More Than Another

Two decks that are the same size can be thousands of dollars apart. Here’s what makes the biggest difference.

Stairs

Stairs take a lot more work than most people expect. Each step needs its own framing, treads and risers, and composite stairs need a sturdier frame than wood. A deck that sits low with three steps costs a lot less than a second-story deck with a long staircase, even if the decks themselves are the same size.

Railings

Railings are priced by length, so a deck with railings all the way around, plus both sides of the stairs, adds up quickly. Higher decks need railings on every open side, while a low deck may only need them in a few areas.

The railing line you choose matters too. Some of the Trex options we install include:

• Trex Select Railing: classic composite railing, often in white with black aluminum balusters, plus the Trex Select T-Rail
• Trex Select Aluminum Railing: a slim, modern look in black aluminum
• Trex Transcend Railing: Trex’s premium composite railing, with more colors and finishes to match your decking
• Trex Signature Aluminum Railing: modern styles including glass panels and mesh that keep your view open

Extras like post cap lights, drink rails and glass panels add to the price, but they can completely change the look of a deck.

Height

A deck high off the ground needs taller posts, more bracing and more railings, and it takes more time and care to build safely. That’s a big part of why second-story decks cost more than ground-level ones.

Decking Material

Pressure-treated wood costs the least up front. Composite comes in several tiers, from entry-level lines like Trex Enhance up to premium lines like Trex Transcend, and the price climbs with each step. You can see every color on Trex’s color selector. Our post on composite vs pressure-treated decking in Connecticut explains how they compare over time.

Design Details

Features like a picture frame border, a parting board, curves, lighting and privacy lattice all add to the price, and they’re also what make a deck look finished and custom.

Special Features

Some features change how you use the space under or around your deck. Trex RainEscape creates a dry area underneath, and a beaded vinyl ceiling turns that space into something that feels like a covered patio. These add more, but they can double the usable space. We’re certified Trex RainEscape installers.

Your Site and Your Old Deck

Sloped yards, tight access, concrete that has to be cut through, and the size of the deck being torn out all affect the labor involved. Sometimes an existing frame is in good enough shape to reuse, which can save money.

Ways to Keep Your Deck Within Budget

• Start with an entry-level composite. Lines like Trex Enhance Basics give you low-maintenance decking at a lower price than premium lines.
• Keep the shape simple. Straight runs and fewer corners take less time and material than angles and curves.
• Think about your stairs. A shorter run of stairs, or stairs placed where the deck sits lowest, can make a real difference.
• Ask about design changes. On one Coventry project, a small layout change gave the homeowner a fancier double picture frame border and saved about 96 square feet of decking waste.
• Plan for later upgrades. Some extras, like certain lighting, can be added down the road. Others, like Trex RainEscape, have to be installed while the deck is being built, so it’s worth deciding on those up front.
• Reuse a frame only if it’s truly solid. Sometimes an existing frame is in good enough shape to keep, and new decking and railings on it cost less than a full rebuild. Seth inspects the frame first, replaces any rotten joists, and adds modern connections like structural ledger screws. If a frame isn’t sound, we’ll tell you, and we won’t put new decking on top of it.

Comparing Quotes

When you compare quotes, make sure you’re comparing the same deck: the same material line, the same railings, the same number of stairs, and the same extras. A lower price sometimes means something was left out. Our post on what to look for in a deck builder in Connecticut covers what to check before you sign.

Our proposals are itemized line by line, so you can see exactly what you’re paying for and adjust options to fit your budget.

Paying for Your Deck

Our contracts are split into progress payments tied to stages of the build, so you see your deck coming together as you pay.

If you’d rather spread the cost out over time, we also offer financing with a simple application process.

The Warranty Difference

As a TrexPro Platinum installer, we can offer the highest level of warranty Trex provides on its decking and railings, and we register it for you. That’s part of the value behind the price, and it isn’t available through every builder.

Thinking About a Deck in Tolland County or Eastern Connecticut?

We’re a family-owned company based in Columbia, and our name is on every deck we build. If you’d like to know what your deck would cost, we’re happy to come out, look at your space and give you a detailed, itemized proposal. Consultations are free.

Call us at (860) 803-9972 or request a consultation.