How Much Does Deck Building Cost in O Fallon, IL?
2026 local pricing guide for deck building in O Fallon, IL with cost breakdowns and provider data.
O Fallon, IL Average
$4,200 – $12,600
Most homeowners pay around $8,400
Low
$4,200
Typical
$8,400
High
$12,600
Based on national averages adjusted for IL cost of living (+5% vs. national average).
3
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Deck Building Cost Breakdown in O Fallon, IL
| Project Type | Low | Typical | High |
|---|---|---|---|
| Pressure-Treated Wood Deck | $4,200 | $7,350 | $11,550 |
| Composite Deck (Trex, TimberTech) | $8,400 | $15,750 | $26,250 |
| Cedar Deck | $6,300 | $10,500 | $16,800 |
| Deck Railing Addition | $1,050 | $2,625 | $5,250 |
| Deck Staining/Sealing | $525 | $1,050 | $2,100 |
| Deck Repair | $265 | $790 | $2,100 |
Prices adjusted for O Fallon, IL cost of living. Actual costs may vary. Get multiple quotes for accurate pricing.
Factors That Affect Deck Building Cost in O Fallon
- Deck size (square footage)
- Material (pressure-treated, cedar, composite)
- Deck height and complexity
- Railing style and material
- Built-in features (stairs, benches, planters)
- Permit requirements
- Site prep and grading
Frequently Asked Questions
How much does deck building cost in O Fallon, IL?
Deck Building in O Fallon, IL typically costs $4,200 to $12,600, with most homeowners paying around $8,400. Costs vary based on project scope, materials, and the contractor you hire.
How many deck building providers are in O Fallon?
There are 3 verified deck building providers in O Fallon, IL. We recommend getting quotes from at least 3 providers.
How much does a deck cost per square foot?
Pressure-treated wood decks cost $15 to $30 per square foot. Composite decks cost $25 to $50 per square foot. Cedar falls between at $20 to $40 per square foot.
How long does it take to build a deck?
A simple deck takes 1 to 2 weeks. A multi-level or complex deck with built-in features can take 3 to 4 weeks. Permit approval adds time to the overall timeline.
Do I need a permit to build a deck?
Almost always yes. Most jurisdictions require a building permit for new decks, especially if attached to the house or elevated above ground level.
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