🌅 How Much Does a Deck Cost? 2026 Installation Price Guide

A well-built deck adds living space, improves curb appeal, and returns 60–70% of its cost at resale. But deck quotes vary wildly — two contractors bidding the same 400 sq ft deck might come in $8,000 apart. Here's what drives those differences and what you should actually pay.

Deck Installation Costs by Material (2026)

Per square foot, fully installed (materials + labor):

• Pressure-treated pine (most affordable): $20–$40/sq ft installed
• Cedar or redwood: $30–$55/sq ft installed
• Composite decking (mid-grade: Trex Enhance, TimberTech Terrain): $40–$65/sq ft installed
• Composite decking (premium: Trex Transcend, TimberTech Azek): $55–$85/sq ft installed
• PVC decking: $60–$90/sq ft installed
• Hardwood (ipe, tigerwood, cumaru): $65–$120/sq ft installed
• Aluminum decking: $55–$100/sq ft installed

For a typical 400 sq ft deck, installed totals run:

• Pressure-treated: $8,000–$16,000
• Composite (mid-grade): $16,000–$26,000
• Premium composite: $22,000–$34,000

What's Included in a Deck Quote

A complete deck quote should cover: footings and posts, beam and joist framing, decking boards (material and labor), stairs, railing system, permits, and cleanup/disposal. Quotes that don't include some of these components will hit you with add-ons mid-project.

What Drives Deck Costs Up

• Deck height and soil conditions. A ground-level deck costs less than a second-story deck that requires tall posts, deeper footings, and diagonal bracing. Every 2 feet of height adds complexity. Soft or wet soil requires larger footings — sometimes poured concrete piers that add $200–$500 per footing.
• Stairs and railing. Stairs add $800–$2,500 depending on run length and material. Railings are one of the most variable components — cable railing runs $150–$300 per linear foot; composite railing runs $50–$120 per linear foot; basic pressure-treated wood railing runs $25–$60 per linear foot.
• Structural complexity. Multi-level decks, curved sections, built-in seating, and cutouts around trees add labor hours significantly. Simple rectangular decks are always more cost-effective per square foot than complex designs.
• Material lead times. Premium composite decking sometimes has 4–8 week lead times. If a contractor quotes a fast start on a composite deck, confirm materials are in stock or allocated.
• Permit complexity. Decks over 30 inches from grade, decks attached to the house, and decks with any electrical (lighting, outlets) typically require permits and inspections. Permit fees range from $150–$600 depending on jurisdiction.

Composite vs. Wood: The Real Cost Comparison

Composite decking costs 2–3x more upfront than pressure-treated wood, but requires almost no maintenance (no staining, sealing, or refinishing). Pressure-treated wood needs to be sealed or stained every 2–3 years at roughly $500–$1,500 per treatment, plus periodic board replacement. Over a 25-year lifespan, the total cost of ownership often favors composite by $3,000–$8,000 despite the higher initial price.

Red Flags in Deck Quotes

• No footing/foundation details. Footings must extend below the frost line in cold climates — often 36–48 inches deep. A quote that doesn't mention footing depth or type is a potential structural problem. Ask specifically: "How deep are the footings, and what type?"
• Lumber grades not specified. Pressure-treated lumber comes in multiple grades (#1, #2, select structural). Framing members should be #1 or better. Unspecified grades mean the cheapest material may be used.
• Railing described only as "code compliant." This tells you nothing about material, style, or cost. Insist on a specific railing system with per-linear-foot pricing.
• Permits waved off. Unpermitted decks are a real estate disclosure nightmare. If the deck isn't permitted and inspected, you'll need to disclose or remediate when you sell. Some buyers' lenders require permitted structures.
• Extremely low bids on composite. Premium composite like Trex Transcend costs $7–$14 per linear foot for decking boards alone. A bid claiming to install composite for $20/sq ft total is either using entry-level composite, substituting materials, or missing major components.

What a Fair Deck Quote Looks Like

For a 400 sq ft attached deck with pressure-treated framing, mid-grade composite decking (Trex Enhance or similar), composite railing on three sides, one stair run (8 steps), permit, and standard footings in the Mid-Atlantic region, expect $18,000–$26,000. Premium composite (Trex Transcend) on the same deck: $24,000–$34,000.

Any quote more than 20% below these ranges should be verified against specific material specs — cheaper quotes often mean cheaper materials or missing components.

Score Your Deck Quote

Deck quotes are notoriously inconsistent between contractors. Before you commit, run your quote through QuoteScore for an instant comparison against real decking benchmarks. We'll flag what's missing, what's overpriced, and what a fair counter looks like — specific to your region and material choices.