Cost to Build a Deck in Connecticut (2026)
A 12×16 ft deck in Connecticut runs about $4,840 in pressure-treated pine and $10,200 in composite, installed — 10% above the US average. Here is what moves that number in Connecticut, with a calculator priced for the state.
Pressure-treated pine
$21–$28 /sq ft
Cedar
$32–$41 /sq ft
Composite
$46–$60 /sq ft
Deck cost calculator for Connecticut
Priced with Connecticut labour, material and footing-depth factors. Change any input and the estimate updates.
Estimated installed cost
$8,976 – $11,730
192 sq ft · about $53.12/sq ft
- Materials
- $6,217
- Labour
- $3,983
- Footings (42 in deep)
- 3 × about $224
- Frost-depth adjustment
- +$173
Mid-range estimate for a rectangular deck attached to the house, with one beam line per 12 ft of depth and footings every 8 ft. Excludes demolition, permits and site work. For railing, stairs and a full line-item breakdown use the main deck cost calculator.
Connecticut deck cost by size and material
Mid-range installed prices for a standard-height deck attached to the house, including framing, footings at the local depth and hardware. Railing and stairs are priced separately in the main deck cost calculator.
| Deck size | Pressure-treated pine | Cedar | Composite |
|---|---|---|---|
| 10 × 10 ft (100 sq ft) | $2,604 | $3,769 | $5,395 |
| 12 × 12 ft (144 sq ft) | $3,673 | $5,352 | $7,693 |
| 12 × 16 ft (192 sq ft) | $4,840 | $7,078 | $10,200 |
| 16 × 20 ft (320 sq ft) | $8,240 | $11,969 | $17,172 |
| 20 × 20 ft (400 sq ft) | $10,185 | $14,846 | $21,350 |
What drives deck prices in Connecticut
Labour
Labour is the biggest regional variable. Carpentry labour in Connecticut runs 15% above the national level, so a composite 12×16 that averages $9,216 nationally comes to about $10,200 here. On pressure-treated decks labour is more than half the bill, so the regional gap is widest on the cheapest material.
Climate
Cold winters with repeated freeze-thaw, humid summers and nor'easters. Shaded lots grow mould and mildew on wood quickly.
Footings and frost depth
Footings in Connecticut typically go 42 inches deep. At 42 inches each 12 inch footing costs roughly $224 installed, and a 12×16 deck needs about 3 of them — a premium of $173 against the 24 inch depth national prices assume.
Which decking makes sense here
Our pick for most Connecticut homes: composite. High labour costs make repeated staining expensive, which tilts the lifetime math toward composite. Composite adds about $5,359 to a 12×16 deck over pressure-treated — see the full 20-year comparison in the composite vs wood calculator.
Permits and code in Connecticut
The Connecticut State Building Code (based on the IRC) applies everywhere, with a 42 inch frost depth. Permit fees are set town by town, often as a rate per $1,000 of construction value.
Typical deck permit fees: $150–$700. Expect a footing inspection before concrete, a framing inspection before the decking goes down and a final. Estimate your fee with the deck permit cost calculator, and read our deck permit guide for what the drawings need to show.
Best time to build a deck in Connecticut
May to October.
Compare neighbouring states
- New York — 12×16 pressure-treated about $5,218 (+17% vs US)
- Massachusetts — 12×16 pressure-treated about $5,246 (+17% vs US)
- Rhode Island — 12×16 pressure-treated about $4,742 (+8% vs US)
Frequently asked questions
How much does it cost to build a deck in Connecticut?
A typical 12×16 ft (192 sq ft) deck in Connecticut costs about $4,840 installed in pressure-treated pine, $7,078 in cedar and $10,200 in composite. That is $21–$28 per square foot for pressure-treated and $46–$60 for composite — 10% above the US average.
Is a composite deck worth it in Connecticut?
On a 12×16 deck composite costs about $5,359 more than pressure-treated up front. High labour costs make repeated staining expensive, which tilts the lifetime math toward composite. Composite needs no staining, which saves a refinishing cycle every two to three years on wood.
Do I need a permit to build a deck in Connecticut?
The Connecticut State Building Code (based on the IRC) applies everywhere, with a 42 inch frost depth. Permit fees are set town by town, often as a rate per $1,000 of construction value. Where a permit is required, fees typically run $150–$700. Under the model residential code, a freestanding deck under 200 sq ft and no more than 30 inches above grade that does not serve an exit door is often exempt — attaching it to the house removes that exemption.
How deep do deck footings need to be in Connecticut?
Typically 42 inches. At about 42 inches, each 12 inch footing costs roughly $224 installed, compared with $167 at a 24 inch depth. Confirm the exact depth with your building department before digging.
When is the best time to build a deck in Connecticut?
May to October. Booking a builder outside the spring rush often gets a faster start date and a keener price.
Is Connecticut expensive for deck building compared with other states?
Connecticut ranks 43 of 50 from cheapest to most expensive on our index. Carpentry labour runs 15% above the national level and materials 5% above it, which puts a typical deck 10% above the US average.
Price the rest of the project
How these figures are made: national installed prices per square foot, split into materials and labour and adjusted by a Connecticut labour index (reasoned from BLS state carpenter wage data), a material and freight index, and the local footing depth. They are planning estimates — get two or three itemised local quotes. Method.