Cost to Build a Deck in Delaware (2026)
A 12×16 ft deck in Delaware runs about $4,407 in pressure-treated pine and $9,534 in composite, installed — 3% above the US average. Here is what moves that number in Delaware, with a calculator priced for the state.
Pressure-treated pine
$20–$26 /sq ft
Cedar
$29–$38 /sq ft
Composite
$44–$57 /sq ft
Deck cost calculator for Delaware
Priced with Delaware labour, material and footing-depth factors. Change any input and the estimate updates.
Estimated installed cost
$8,390 – $10,964
192 sq ft · about $49.66/sq ft
- Materials
- $5,893
- Labour
- $3,641
- Footings (27 in deep)
- 3 × about $176
- Frost-depth adjustment
- +$29
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.
Delaware 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) | $2,309 | $3,336 | $4,980 |
| 12 × 12 ft (144 sq ft) | $3,312 | $4,791 | $7,158 |
| 12 × 16 ft (192 sq ft) | $4,407 | $6,379 | $9,534 |
| 16 × 20 ft (320 sq ft) | $7,374 | $10,660 | $15,919 |
| 20 × 20 ft (400 sq ft) | $9,198 | $13,306 | $19,880 |
What drives deck prices in Delaware
Labour
Labour is the biggest regional variable. Carpentry labour in Delaware runs 5% above the national level, so a composite 12×16 that averages $9,216 nationally comes to about $9,534 here. On pressure-treated decks labour is more than half the bill, so the regional gap is widest on the cheapest material.
Climate
Mid-Atlantic humidity with mild winters inland and salt air along the beaches, which corrodes ordinary hardware.
Footings and frost depth
Footings in Delaware typically go 24–30 inches deep. At 27 inches each 12 inch footing costs roughly $176 installed, and a 12×16 deck needs about 3 of them — a premium of $29 against the 24 inch depth national prices assume.
Which decking makes sense here
Our pick for most Delaware homes: pressure-treated pine. Moderate climate and costs keep pressure-treated a sound value inland; beach homes lean composite for salt and sun. Composite adds about $5,127 to a 12×16 deck over pressure-treated — see the full 20-year comparison in the composite vs wood calculator.
Permits and code in Delaware
Counties and municipalities enforce the IRC. Coastal Sussex County builds need higher wind design and corrosion-resistant fasteners near the water.
Typical deck permit fees: $100–$450. 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 Delaware
April to June and September to November.
Compare neighbouring states
- Maryland — 12×16 pressure-treated about $4,436 (+3% vs US)
- Pennsylvania — 12×16 pressure-treated about $4,484 (+2% vs US)
- New Jersey — 12×16 pressure-treated about $5,015 (+14% vs US)
Frequently asked questions
How much does it cost to build a deck in Delaware?
A typical 12×16 ft (192 sq ft) deck in Delaware costs about $4,407 installed in pressure-treated pine, $6,379 in cedar and $9,534 in composite. That is $20–$26 per square foot for pressure-treated and $44–$57 for composite — 3% above the US average.
Is a composite deck worth it in Delaware?
On a 12×16 deck composite costs about $5,127 more than pressure-treated up front. Moderate climate and costs keep pressure-treated a sound value inland; beach homes lean composite for salt and sun. 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 Delaware?
Counties and municipalities enforce the IRC. Coastal Sussex County builds need higher wind design and corrosion-resistant fasteners near the water. Where a permit is required, fees typically run $100–$450. 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 Delaware?
Typically 24 to 30 inches depending on the part of the state. At about 27 inches, each 12 inch footing costs roughly $176 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 Delaware?
April to June and September to November. Booking a builder outside the spring rush often gets a faster start date and a keener price.
Is Delaware expensive for deck building compared with other states?
Delaware ranks 34 of 50 from cheapest to most expensive on our index. Carpentry labour runs 5% above the national level and materials 2% above it, which puts a typical deck 3% 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 Delaware 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.