Illinois Roofing License IDFPR #19HC00108700 · GAF Certified Contractor
Roof replacement is priced per square foot, but “$5.50 per square foot” doesn’t help much until you know how big your roof actually is. This guide shows realistic 2026 Riverbend pricing for common Illinois home sizes – from a small 1,500 sq ft ranch through a 4,000 sq ft two-story – so you can match your home to a price range before getting quotes.
How to estimate your roof’s square footage
The fast estimate: take your home’s floor area and multiply by a pitch factor:
- Low pitch (3/12-4/12): floor area × 1.25
- Standard pitch (5/12-6/12): floor area × 1.4
- Steep pitch (7/12-9/12): floor area × 1.55
- Very steep (10/12+): floor area × 1.75
Example: a 2,000 sq ft single-story home with a 6/12 pitch = approximately 2,800 sq ft of roof surface.
This estimate is rough. A real measurement (which we do during the inspection) accounts for overhangs, dormers, hips, and other complexity.
Pricing by roof size – standard architectural
Mid-range architectural shingles (GAF Timberline HDZ or equivalent), standard installation in the Riverbend:
| Roof size (sq ft) | Low end | High end | Typical |
|---|---|---|---|
| 1,500 | $6,750 | $10,500 | $8,250 |
| 2,000 | $9,000 | $14,000 | $11,000 |
| 2,500 | $11,250 | $17,500 | $13,750 |
| 3,000 | $13,500 | $21,000 | $16,500 |
| 3,500 | $15,750 | $24,500 | $19,250 |
| 4,000 | $18,000 | $28,000 | $22,000 |
“Typical” is the median; your specific quote moves based on complexity, decking condition, and shingle tier (covered in the cost calculator).
Pricing by roof size – Class 4 impact-resistant
Class 4 IR shingles add ~$0.75 per sq ft over standard architectural – typically pays back via IL homeowner insurance discount in 5-8 years:
| Roof size (sq ft) | Typical Class 4 install |
|---|---|
| 1,500 | $9,400 |
| 2,000 | $12,500 |
| 2,500 | $15,600 |
| 3,000 | $18,750 |
| 3,500 | $21,900 |
| 4,000 | $25,000 |
Pricing by roof size – premium designer/luxury
Designer asphalt (GAF Camelot, CertainTeed Grand Manor) for high-end homes:
| Roof size (sq ft) | Designer install (midpoint) |
|---|---|
| 1,500 | $16,500 |
| 2,000 | $22,000 |
| 2,500 | $27,500 |
| 3,000 | $33,000 |
| 3,500 | $38,500 |
| 4,000 | $44,000 |
Designer-tier pricing is most justified on homes where curb appeal directly affects property value (premium subdivisions, historic homes).
Common Riverbend home sizes
From experience inspecting hundreds of Riverbend homes, typical roof sizes by home style:
- Small ranch (1,000-1,400 sq ft floor area): 1,500-2,000 sq ft roof
- Standard ranch (1,400-1,800 sq ft floor area): 2,000-2,600 sq ft roof
- 1.5-story bungalow: 1,500-2,000 sq ft roof (footprint is smaller, but more pitch)
- Two-story colonial (2,000-2,500 sq ft floor area): 2,400-3,200 sq ft roof
- Large two-story (2,500-3,500 sq ft floor area): 3,200-4,500 sq ft roof
- Victorian / complex roof (any size): add 15-25% for valleys and dormers
When the number changes after inspection
The initial quote is good for 60 days. The final number can change at install time only if:
- Decking replacement is needed beyond the original allowance (at-cost, no markup)
- You upgrade or change shingle line
- You add scope (gutter work, additional flashing, etc.)
The quote does NOT change because of weather delays, crew scheduling, or other operational factors. A Trill Roofing written estimate is binding on the line items quoted.
Get your specific quote
For an accurate estimate on your specific home, schedule a free inspection at /free-inspection/. Inspection produces a written quote within 48 hours with all variables itemized.
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Get a free roof inspection from Trill Roofing
No-pressure, written estimate. Family-owned. IL-licensed. Serving Godfrey and the Riverbend.