Is $100/sqft too much for a deck?

$100/sqft is at the high end — but not always unreasonable. In New York, Boston, or San Francisco, elevated decks with cable railing and composite decking regularly reach $80–$120/sqft. In North Carolina or Texas, $100/sqft is above market. The right benchmark depends on your specific location, materials, and project complexity.

How much does it cost to build a 400 square foot deck?

A 400 sqft deck costs $10,000–$28,000 for composite decking in most markets. Budget for: $5,000–$8,000 in composite decking materials, $4,000–$8,000 in labor, $2,000–$6,000 for railing, $1,500–$4,000 for stairs (one set), and $500–$2,000 for permits and hardware. In the Northeast or West Coast, add 30–50%.

What is a fair price for a composite deck?

Fair pricing for composite decking varies significantly by region. In the Southeast (NC, GA, FL), $40–$60/sqft installed is fair. In the Midwest, $45–$65/sqft. In the Northeast (CT, NY, NJ, MA), $55–$80/sqft. On the West Coast (CA), $60–$90/sqft. A bid more than 30% above these ranges deserves scrutiny.

Deck Cost Guide · Real Data · Updated March 2026

How Much Does a Deck Cost in 2026?

Q: How much does a deck cost per square foot in 2026?

Deck cost per square foot installed ranges from $25–$45/sqft for pressure treated wood, $35–$70/sqft for composite decking in most markets, and $50–$100+/sqft in high-cost markets like New York and California. Elevated decks, complex layouts, cable railing, and stairs significantly increase the per-sqft cost.

Q: How much does a Trex deck cost?

A Trex deck costs $35–$75/sqft installed for most markets (Trex Enhance or Select). Trex Transcend runs $50–$85/sqft installed. On a 400 sqft deck, that is $14,000–$34,000 depending on material tier, railing type, and region. Material costs alone are $4.50–$15/sqft for the decking boards.

Not national averages — real prices from 136 homeowner projectswe analyzed. Here's what decks actually cost by material, size, and where you live.

🔍

Have a deck bid in hand?

BidLens compares your bid against regional pricing, checks the material specs, and tells you if you're being overcharged — free.

Analyze my deck bid →

Why This Guide Is Different

Most deck cost guides quote national averages from Angi or HomeAdvisor — numbers averaged across thousands of projects that may have nothing to do with your zip code or material choice. This guide is built from real homeowner-reported bids in r/Decks and r/HomeImprovement, enriched with regional labor data from BLS and actual contractor billing rates. The range you'll see isn't a guess — it's what people actually paid.

Deck Cost Per Square Foot — At a Glance

Material	Southeast	Midwest	Northeast	West Coast
Pressure Treated Wood	$25–$42	$28–$48	$32–$55	$35–$60
Composite (entry)	$32–$50	$35–$55	$40–$65	$45–$70
Trex Enhance / Select	$38–$55	$42–$62	$48–$72	$52–$80
Trex Transcend / AZEK	$50–$70	$55–$78	$62–$90	$68–$100
Cable railing add-on	+$15–$25	+$18–$28	+$20–$35	+$22–$40

Installed cost per sqft. Includes decking material, framing, labor, and basic composite or wood railing. Does not include stairs, permits, or demo. Northeast highlighted — highest cost region in the US.

What Homeowners Actually Paid

Real bids from 136 homeowner projects we analyzed. These are the conversations people have when they're confused about whether a bid is fair.

r/HomeImprovement350 sqft deck — composite

$35,000 (~$100/sqft)

Community verdict: Community consensus: high but not crazy for elevated deck with cable railing in a high-cost market. "Get three quotes."

r/HomeImprovement360 sqft Trex composite — North Carolina, elevated, stairs, A-frame roof

$24,800 (~$69/sqft)

Community verdict: Community consensus: fair. NC market, full Trex spec with roof structure. Solid bid.

r/DecksDemo + rebuild with AZEK Advanced PVC, 10+ stairs, elevated

$37,000

Community verdict: Community consensus: on the higher side but AZEK PVC is premium material. Demo adds cost.

r/Decks400 sqft Trex — Philadelphia, elevated

$91/sqft ($36,400 total)

Community verdict: Community flagged as overpriced. Fair range for elevated Trex in Philly: $55–$75/sqft. This bid had ~100% markup on materials.

r/Decks300 sqft Trex composite — materials vs. full bid comparison

Materials: $1,500–$16,000 / Full installed: varied

Community verdict: Thread confirmed: material cost alone spans 10x depending on Trex tier. Always spec the exact product line.

r/Decks$10K materials → $40K bid (verified by contractor in thread)

$40,000 on $10K materials

Community verdict: Critical: 100% markup confirmed in thread by a contractor who explained their pricing. Industry standard is 15–35%.

Composite Decking: What You're Actually Buying

"Composite decking" spans a 3x price range. The brand and product line matter. A bid that says "composite" without specifying which one is missing the most important cost driver.

Product	Tier	Material Only	What It Means
Trex Enhance Basics	Entry	$4.50–$8.50/sqft	Most affordable Trex. 25-year warranty. Scalloped underside reduces weight.
Trex Enhance Naturals	Entry+	$5.50–$9.50/sqft	Wood grain texture. More color options than Basics.
Trex Select	Mid	$7–$10/sqft	Better stain/fade resistance. 5 monotone colors. Popular mid-range choice.
Trex Transcend	Premium	$9–$15/sqft	Top-tier Trex. Best colors/performance. Most common "premium composite" spec.
Trex Transcend Lineage	Premium+	$11–$17/sqft	Wide-plank, low-sheen finish. Very popular in 2025–2026.
TimberTech AZEK Landmark	Premium	$10–$18/sqft	PVC (not composite). No wood fiber = most moisture resistant. Premium pricing.
Pressure Treated Pine	Budget	$2–$5/sqft	Lowest cost. Requires staining every 2–3 years. Splinters over time. Still popular.

⚠ The substitution risk: A contractor quoting "Trex composite" without specifying the product line could install Enhance Basics ($4.50/sqft) while pricing as if Transcend ($12/sqft). On a 400 sqft deck that's a $3,000 material difference that ends up as contractor profit. Always require the exact product name in writing.

What Each Add-On Actually Costs

These are the line items most frequently omitted from lump-sum bids — and the ones that become change orders.

Aluminum railing

$40–$100/LF installed

Standard residential. Powder-coated. Most common composite deck railing.

Cable railing

$80–$150/LF installed

Modern look. Requires tension posts. Premium pricing. Verify $417/LF quotes — confirmed scam level.

Glass panel railing

$100–$250/LF installed

Unobstructed view. Highest maintenance. Typically primary deck or water-view only.

Composite railing

$30–$75/LF installed

Matches composite decking. Less expensive than metal. Matches deck aesthetics.

Stairs (1 set)

$1,500–$4,000

3–4 ft wide, standard rise/run. More stairs = more cost. Each additional set adds $1,200–$3,000.

Demo / removal

$1,000–$3,000

Removing existing deck. Frequently missing from bids. Confirm who is responsible.

A-frame roof/pergola

$5,000–$15,000

Structural roof over deck. Requires separate permit. Always a separate line item.

Permits

$50–$500

Required for most attached and elevated decks. Contractor should pull. Verify it's included.

Cost by Deck Size (Composite, Northeast Pricing)

Using Northeast pricing because that's the highest-cost market. Reduce by 15–25% for Southeast, 10–15% for Midwest.

10×12 (120 sqft)

$58–$108/sqft

$7,000–$13,000

Small landing deck. High per-sqft due to fixed costs (footings, permit, mobilization).

12×16 (192 sqft)

$52–$94/sqft

$10,000–$18,000

Small functional deck. Common starter size.

16×20 (320 sqft)

$50–$88/sqft

$16,000–$28,000

Mid-size deck. Room for dining table + seating.

20×24 (480 sqft)

$50–$83/sqft

$24,000–$40,000

Large deck. Most common for "outdoor living room" builds.

24×30 (720 sqft)

$50–$83/sqft

$36,000–$60,000

Large format. Per-sqft stabilizes as fixed costs get spread over more area.

Includes composite decking (Trex Enhance/Select), aluminum railing, one set of stairs, permits, and labor. Does not include demo or specialty features.

Is Your Deck Bid Fair?

The fastest way to gut-check a bid: calculate the per-sqft price, then compare to your region. Also check the markup — contractors typically add 15–35% over their material and labor costs.

The markup formula:

markup % = (total bid − materials − labor) ÷ (materials + labor) × 100

Example: $40,000 bid, $10,000 materials, $20,000 labor:

($40,000 − $10,000 − $20,000) ÷ ($10,000 + $20,000) × 100 = 33% markup — normal range

From a real Reddit thread: one contractor confirmed $10K materials + $10K labor billed at $40K total = 100% markup. That thread had 150 comments.

Normal15–35% markup

Standard contractor profit margin. Covers overhead, insurance, equipment, business costs.

Caution35–75% markup

Worth asking about. May be justified by project complexity, premium crew, or difficult access.

Red flag75–100% markup

Ask for an itemized breakdown. Get a second bid. This level is rare from reputable contractors.

Walk away100%+ markup

Verified in real bids from r/Decks. Doubling material + labor costs is not a standard business practice.

BidLens does this analysis in 60 seconds

Upload your deck bid and BidLens compares it against regional pricing benchmarks, calculates the contractor markup, checks material specs, and flags structural and payment red flags.

✓ Per-sqft price vs. regional benchmarks for your zip code
✓ Contractor markup calculation from itemized line items
✓ Material spec check — Trex tier, joist spacing, footing depth
✓ Structural code compliance (IRC R507)
✓ Plain-English verdict: Sign / Negotiate / Get Another Bid / Walk Away

Analyze my deck bid free →

Frequently Asked Questions

How much does a deck cost per square foot in 2026?+

Composite decking installed runs $35–$70/sqft in most markets. In the Northeast (NY, CT, MA, NJ), expect $48–$90/sqft. In the Southeast (NC, GA, FL), $32–$55/sqft is typical. Pressure treated wood is $25–$45/sqft nationally. Per-sqft cost goes up for smaller decks (fixed costs spread over less area) and elevated decks (more structural work).

How much does a Trex deck cost?+

Trex material costs $4.50–$22/sqft for the boards alone depending on the product line (Enhance Basics to Signature). Fully installed with framing, railing, and labor, a Trex deck runs $35–$85/sqft depending on your region and which Trex line is specified. Always ask for the exact product name — "Trex composite" without a line is not a spec.

Is $100 per square foot too much for a deck?+

$100/sqft is at the top of the range — not automatically a scam. Elevated decks with cable railing and premium composite in New York or California regularly hit $80–$120/sqft. In North Carolina or Texas, $100/sqft is above market and worth questioning. What matters is: what material, what railing type, what region, and what is the contractor's markup.

How much does it cost to build a 400 sqft deck?+

A 400 sqft composite deck typically costs $14,000–$28,000 in most markets. Budget $5,000–$8,000 for composite materials, $5,000–$9,000 for labor, $2,500–$5,000 for railing (50 LF), $1,500–$3,000 for one set of stairs, and $500–$2,000 for permits. Add 30–50% for Northeast or West Coast markets.

What should I look for in a deck bid to know if it's fair?+

Three things: (1) Is the material spec exact — specific product line, not just "composite"? (2) What is the markup — take the total bid, subtract materials and labor, divide by materials + labor. 15–35% is standard. Over 75% is a red flag. (3) Is everything included — demo, permits, railing LF count, stairs? The cheapest bid usually omits items others include.

Related Guides

Contractor Red Flags: 26 Warning Signs

Financial, structural, and behavioral flags to check.

How to Compare Contractor Bids

Level scope, verify materials, calculate markup.

How Much to Pay a Contractor Upfront

10–33% is normal. Over 50% is a red flag.

What Should a Contractor Bid Include?

The complete checklist every deck bid must pass.

Have a deck bid to check against this data?

BidLens compares your bid to real regional pricing

Upload your bid and BidLens checks your per-sqft price, material spec, markup, and structural flags — free.

Analyze my deck bid →