Saint Louis, MO · 2026 cost guide
How much does a deck cost in Saint Louis?
In Saint Louis, a deck costs about $4,400–$17,500 in 2026 for a 320 sq ft deck, from pressure-treated to composite — roughly $13.77–$55.08 per square foot. That’s in line with the Missouri average.
Estimate your Saint Louis project with the Deck Cost Calculator →
Saint Louis cost breakdown
| Saint Louis typical range | $4,400–$17,500 |
| Saint Louis per square foot | $13.77–$55.08 |
| Missouri state average | $4,300–$17,000 |
| Versus Missouri average | in line with average |
What’s different about Saint Louis
St. Louis has a deep contractor pool and older housing stock, with hail, wind, and humid summers shaping exterior durability and material choices.
- Severe-storm exposure favors impact-resistant materials.
- Rot- and mold-resistant or composite materials are favored in humid climates.
How the cost is built
Deck cost depends on size, decking material (pressure-treated pine is cheapest; composite and PVC are mid-range; tropical hardwood is premium), and structural extras like railings, stairs, and elevated footings. Permits and ledger flashing add cost on attached decks.
Frequently asked questions
How much does a deck cost in Saint Louis?
In Saint Louis, a deck costs about $4,400 to $17,500 in 2026 for a 320 sq ft deck, from pressure-treated to composite — roughly 13.77–55.08 per square foot. That's in line with the Missouri average, reflecting local labor and permit costs.
What affects the cost of a deck in Saint Louis?
St. Louis has a deep contractor pool and older housing stock, with hail, wind, and humid summers shaping exterior durability and material choices. Severe-storm exposure favors impact-resistant materials.
How can I get an accurate deck building estimate in Saint Louis?
Use the free Deck Cost Calculator to plug in your real measurements, then collect two or three local Saint Louis quotes to compare. Prices vary by neighborhood, access, and project complexity.
Deck building cost in other Missouri metros
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Open calculator →The Saint Louis figure scales the Missouri cost range by a local metro index, then adjusts for the city’s labor market and climate. A 2026 planning estimate, not a quote — get local bids. See our methodology.