Real Numbers
What a deck costs in Central Illinois
Installed pricing from jobs we actually build around Morton, Pekin, Washington, East Peoria, Peoria, Bloomington and Normal — not a national average.
Cost by deck size and material
| Deck size | Treated pine | Cedar | Composite |
|---|---|---|---|
| 10 x 12 (120 sq. ft.) | $3,000–$4,300 | $3,900–$5,400 | $4,700–$7,600 |
| 12 x 16 (192 sq. ft.) | $4,700–$6,700 | $6,200–$8,500 | $7,400–$12,000 |
| 16 x 20 (320 sq. ft.) | $7,800–$11,000 | $10,300–$14,100 | $12,300–$20,000 |
| 20 x 24 (480 sq. ft.) | $11,600–$16,400 | $15,400–$21,200 | $18,300–$29,800 |
Ranges cover a standard ground-to-mid-height deck with one stair run. Walkout height, multi-level layouts, roofed sections and premium rail push above these figures.
Cost by add-on
Composite Decks
$38–$62
per sq. ft. installed
Cedar & Treated Wood Decks
$24–$44
per sq. ft. installed
Railings & Stairs
$95–$190
per linear foot of railing
Pergolas & Shade
$4,500–$16,000
per structure installed
Deck Lighting
$850–$4,200
per project installed
Deck Repair & Restoration
$600–$8,000
per repair project
Straight Answers
Deck pricing questions
- What does a deck cost per square foot in Central Illinois?
- Installed, pressure-treated runs about $24–$34 per square foot, cedar $32–$44, and capped composite $38–$62. Those figures include framing, footings, fasteners and labor — not just decking.
- Why do two decks the same size cost different amounts?
- Height, stairs and railing. A ground-level deck needs no guard rail and short posts. The same square footage at walkout height needs taller posts, more footings, a full rail run and a long stair flight — often 30 to 50 percent more.
- Is composite worth the extra money?
- If you plan to stay in the house more than about seven years, usually yes. Composite costs more up front and eliminates the sanding, staining and board replacement that treated decks need every few years.
- Does the quote include the permit?
- Yes. Permit fees and the drawings are line items in our written quote, and we handle the submittal and inspections.
- Do you charge for an estimate?
- No. On-site measures and written estimates are free anywhere in our service area, and you can pre-design your deck in our 3D designer first so the number matches exactly what you want.