Deck Addition Cost: Wood vs. Composite vs. PVC (2026 Guide)
A new deck costs $15–$35+ per square foot installed, totaling $8,000–$25,000 for most residential decks. Material choice drives the budget — here's the full breakdown with long-term cost comparisons.
A deck adds usable living space and is one of the higher-return outdoor improvements you can make. The material decision matters more than most homeowners realize — the upfront cost difference between wood and composite can be $4,000–$8,000 on a typical deck, but the long-term maintenance math often flips the equation. Here's what you need to know.
Deck Cost by Material
| Material | Material Cost/sq ft | Installed Cost/sq ft | 20-Year Total (400 sq ft) |
|---|---|---|---|
| Pressure-treated pine | $2–$5 | $15–$22 | $14,000–$22,000* |
| Cedar | $4–$8 | $18–$28 | $16,000–$26,000* |
| Tropical hardwood (Ipe) | $10–$20 | $25–$45 | $22,000–$35,000* |
| Composite (uncapped) | $5–$10 | $20–$30 | $13,000–$20,000 |
| Capped composite (Trex, Fiberon) | $8–$15 | $25–$40 | $15,000–$24,000 |
| PVC (Azek, TimberTech) | $9–$18 | $28–$45 | $16,000–$28,000 |
*Wood totals include estimated maintenance (annual cleaning, staining every 2–3 years, board replacement).
Structure Cost: What's Under the Boards
The decking material gets the attention, but the structure — posts, beams, joists, ledger — is typically 40–50% of the total build cost regardless of what goes on top. Most residential decks use pressure-treated lumber for the structure even when composite decking is used above.
Key structural cost drivers:
- Footings: Concrete footings must be below the frost line. In cold climates (USDA Zone 5 and below), this means 3–4 foot depth. More digging = more cost. Expect $200–$500 per footing.
- Deck height: Ground-level decks ($200–$400 worth of post material) are far cheaper than elevated decks requiring taller posts, diagonal bracing, or under-deck privacy enclosures.
- Joist span: Longer spans require deeper joists (2×10 vs. 2×8) — added material and header costs.
- Ledger attachment: Attaching to the house requires removing siding, installing flashing, and lag-bolting to the rim joist. This must be done correctly to prevent water intrusion into the wall cavity. Freestanding decks avoid this entirely but require a parallel beam system instead.
Railings: The Most Variable Line Item
Railings are often the biggest cost variable after the decking material itself.
| Railing Type | Cost per Linear Foot (installed) |
|---|---|
| Pressure-treated wood | $25–$50 |
| Composite | $50–$90 |
| Aluminum (powder-coated) | $60–$120 |
| Cable railing (stainless) | $100–$200 |
| Glass panel railing | $150–$300 |
A 100-foot railing perimeter (typical for a 400 sq ft deck with two open sides) can range from $2,500 for basic wood to $20,000+ for frameless glass. This is where high-end decks get expensive fast.
Stairs and Landings
Every 10 inches of vertical rise requires roughly one step. A deck 4 feet above grade needs approximately 6 steps. Stair construction runs $150–$300 per step installed, including stringers, treads, and handrail. Budget $1,000–$2,500 for a standard 5–7 step stair run.
Permit, Plan, and Inspection
Almost every attached deck and any elevated deck over 30 inches requires a permit. The permit fee ($200–$600 in most markets) is minor — the real benefit is the inspections confirming the footings, ledger attachment, and railings meet code. This protects you at resale and prevents liability if someone is injured on an unpermitted structure.
Some jurisdictions require engineered drawings for larger or elevated decks. If your GC mentions this, it's legitimate — not an upsell. An engineer's stamp runs $300–$600 and is required in many coastal and high-wind zones.
Hiring a Contractor
Deck construction falls under general carpentry/framing, not a specialty license in most states. Look for a contractor with:
- Proof of liability insurance and workers' comp — falls are a leading cause of construction injuries
- Experience with your local permit process — some areas have specific footing requirements, setback rules, or HOA restrictions
- References for decks specifically — deck framing is different from interior framing; ask to see completed work
Get 3 bids and compare on scope: are the footings the same depth? Same joist spacing (12" vs. 16" on center)? Same railing specification? Bids that look far apart often differ on one of these variables.
If you have a wood deck: Protect your investment with a penetrating deck stain/sealant applied every 2–3 years. Ready Seal 520 is a stain-and-sealer combo that soaks into the wood grain rather than sitting on the surface — it doesn't peel, can be reapplied without stripping, and works well on pressure-treated, cedar, and pine.
Related: Garage Conversion Cost · Home Renovation Budget Calculator · How to Hire a General Contractor
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Written by BlueprintKit
BlueprintKit publishes expert construction and renovation content based on real project experience. Every guide is reviewed by a licensed general contractor.