Deck cost in St. Louis, MO (2026)
For a typical 300 sq ft deck in the St. Louis metro, mid-range typically runs $6,466. Labor here averages 7% above national trade wages, with materials at each tier's quality level and contractor overhead applied the way contractors actually bill.
Standard-tier breakdown, line by line
| Line item | Category | Typical cost |
|---|---|---|
| Decking boards | Material | $1,500 |
| Framing lumber and hardware | Material | $1,200 |
| Framing and structural work | Labor | $820 |
| Railing materials | Material | $750 |
| Decking installation | Labor | $615 |
| Stair components | Material | $450 |
| Demolition of existing deck (if applicable) | Labor | $314 |
| Railing installation | Labor | $307 |
| Fasteners, brackets, and hardware | Supplies | $300 |
| Stain or sealant | Material | $150 |
| Debris removal | Disposal | $60 |
| Total (incl. overhead) | $6,466 |
St. Louis trade wages behind this estimate
| Trade | SOC | Median /hr | vs. national |
|---|---|---|---|
| Carpenters | 47-2031 | $24.40/hr | −9% |
| Construction Laborers | 47-2061 | $24.90/hr | +23% |
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Missouri permit guide →Decks — what homeowners ask
Deck construction costs $15-$45 per square foot. Pressure-treated wood decks cost $15-$25/sqft, composite decking runs $25-$40/sqft, and premium hardwood or PVC decks can exceed $40-$60/sqft. A 300 sqft deck typically costs $5,000-$15,000.
Most jurisdictions require a building permit for decks over 200 sqft or 30 inches above grade. Permits typically cost $100-$500 and require structural plans. Check with your local building department before starting construction.
A standard deck build takes 1-3 weeks from start to finish. Simple ground-level decks can be completed in 3-5 days, while elevated decks with stairs, railings, and complex designs may take 2-4 weeks.