Pressure Treated Wood Deck Cost vs Composite

Key Takeaways

• Pressure-treated pine decks cost $15–25/sq ft installed; composite decks run $35–50/sq ft — a $7,000–$12,000 difference on a typical 400 sq ft deck.
• Wood is cheaper to build but costs $400–$900 every 2–3 years to clean, stain, and seal — about $6,000–$9,000 over 20 years.
• Composite needs no staining and lasts 25–30 years, but costs more upfront and can scratch, fade, and get hot in direct sun.
• On a 20-year total-cost basis, composite often wins; on a 10-year cash-flow basis, pressure-treated wood wins.

Introduction

This is the most common deck decision in America, and it is rarely as simple as comparing sticker prices. Pressure-treated pine is the affordable classic: a 400 sq ft treated deck runs about $7,000–$10,000 installed, while the same deck in composite runs $14,000–$20,000. The gap is real — but so is the maintenance bill that follows wood around for its entire life.

This guide compares the two on upfront cost, 20-year total cost, maintenance demands, and resale value, with 2026 pricing so you can decide which one fits your budget and your tolerance for weekend chores.

Upfront Cost Comparison (2026)

• Pressure-treated pine: $4–7/sq ft material; $15–25/sq ft installed; $7,000–$10,000 for a 400 sq ft deck.
• Entry composite (Trex Select, TimberTech Terrain): $30–38/sq ft installed.
• Mid-range composite (Trex Transcend, TimberTech Pro): $38–48/sq ft installed.
• Premium composite (Azek Vintage, TimberTech Azek): $45–55/sq ft installed.

Why the Price Difference Exists

Pressure-treated lumber is cheap because pine is abundant and the treatment process — infusing boards with copper-based preservatives under pressure — costs pennies per board foot. Composite, by contrast, is a manufactured product: wood fibers or bamboo flour blended with recycled polyethylene plastic, extruded through expensive tooling, and wrapped in a color cap that resists fading. The manufacturing, plus dealer networks and warranties, is why composite costs 2–3x more at the lumberyard.

The economic logic flips over time. Wood decks need cleaning and staining every 2–3 years at $400–$900 per cycle — call it $6,000–$9,000 over 20 years. Composite decks need only soap-and-water cleaning and cost $0–$200 per year to maintain. After roughly 12–15 years, the cumulative cost of wood catches up to composite’s higher upfront price.

Durability and Lifecycle Reality

A well-maintained pressure-treated deck lasts 15–25 years before boards start splitting, warping, and rotting at the ends. Composite is warrantied for 25–30 years and typically outlives the warranty, but it is not maintenance-free: it can fade in harsh sun (capped boards resist this), scratch from patio furniture, and get hot enough in July to be uncomfortable barefoot — dark colors in full sun can exceed 140°F. Wood stays cooler but splinters.

Hidden Costs on Both Sides

• Wood: staining labor, replacement boards ($3–6/board), screw pops, and the eventual cost of sanding before restaining.
• Composite: premium hidden-fastener clips ($0.50–1/sq ft extra), potential joist spacing upgrades (16-in. centers required by most warranties), and color fading on budget uncapped lines.
• Both: railing, stairs, and framing cost roughly the same regardless of which decking you choose.

Regional Differences

In the South and Southeast, pressure-treated decks dominate because termites and humidity shorten the life of cedar, and composite’s heat retention is a real downside in full sun. In the Northeast and Pacific Northwest, composite is more common because rain makes wood maintenance miserable. Labor rates follow the same regional pattern as all deck work: $45–$65/hr in the South versus $70–$100/hr on the coasts.

DIY vs. Hiring a Contractor

Wood is more forgiving for DIY: boards can be cut and replaced cheaply, and mistakes cost dollars, not hundreds. Composite is less forgiving — boards are expensive, must be cut with fine-tooth blades to avoid chipping the cap, need hidden fasteners, and require precise 1/8-in. gapping for expansion. If you DIY wood, you can save $5,000–$8,000 in labor on a 400 sq ft deck. If you DIY composite, the savings are similar but the risk of a warranty-voiding mistake is much higher.

Money-Saving Tips

• Buy composite in spring or fall — many dealers discount discontinued colors 20–30%.
• Use wood for framing, composite for decking — nobody sees the joists, and you save 30–40% of the structure cost.
• Skip the premium color line — mid-range composite looks nearly identical for $5–8/sq ft less.
• If you choose wood, stain within 4–6 weeks — the longer you wait, the more prep work (and money) it takes.