Cost Guides

Cost to Build a Deck in Denver (2025 Guide)

Denver's outdoor lifestyle makes decks one of the highest-ROI home improvements in the market. With 300+ days of sunshine, a well-built deck gets used year-round. Here's what Denver homeowners actually pay.

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Key Takeaways

1
Standard 300 sq ft deck in Denver: $8,000–$20,000 depending on material
2
Composite decking is the most popular choice in Denver for low maintenance and UV resistance
3
Denver requires permits for attached decks and decks over 30 inches above grade
4
Frost-depth footings (36–42 inches) are required in Denver

Average Deck Building Cost in Denver

Pressure-treated wood deck (basic): $15–$25/sq ft installed. A 300 sq ft deck runs $4,500–$7,500.

Cedar or redwood deck: $20–$35/sq ft installed.

Composite deck (Trex, TimberTech): $30–$60/sq ft installed. A 300 sq ft composite deck: $9,000–$18,000.

Most Denver homeowners building a standard 300–400 sq ft deck spend $8,000–$20,000.

Denver-Specific Deck Considerations

Denver's UV intensity at 5,280 ft degrades wood faster than lower-elevation cities — quality stain/sealant is essential for wood decks.

Freeze-thaw cycles affect footings. Denver requires frost-depth footings (typically 36–42 inches) to prevent heaving.

Hail damage is a real factor — composite decking handles hail better than wood. Many Denver homeowners choose composite specifically for low maintenance and hail resistance.

Permit Requirements for Decks in Denver

Denver requires a building permit for any deck attached to the home or over 30 inches above grade. Permit fees: $200–$600.

Inspections required at: footing, framing, and final. Your contractor should handle all permit applications.

Unpermitted decks must be disclosed at resale — always permit your deck.

Wood vs. Composite in Denver

Wood: Lower upfront cost, requires annual maintenance, 15–20 year lifespan in Denver's UV environment.

Composite (Trex, TimberTech, Fiberon): Higher upfront cost, minimal maintenance, 25–30 year warranties, handles Denver UV and hail better. Most popular choice for new Denver decks.

Frequently Asked Questions

Do I need a permit to build a deck in Denver?

Yes, for any deck attached to the home or over 30 inches above grade. Permit fees run $200–$600. Your contractor should handle the application and inspections.

How much does a Trex deck cost in Denver?

A composite Trex deck in Denver costs $30–$60/sq ft installed. A 300 sq ft Trex deck runs $9,000–$18,000 depending on design complexity.

What is the best decking material for Denver's climate?

Composite decking (Trex, TimberTech) is the best choice for Denver. It handles UV intensity, freeze-thaw cycles, and hail better than wood with minimal maintenance.

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