BFA Roofing
Roof Cost Calculator
A planning budget for your home. Standard installation and a 15% waste allowance included.
Your estimated budget
15% waste allowance included
Asphalt shingles or standing-seam metal?
Your home's size and roof shape determine the range. No contact information required.
Need a roof-specific quote? Call 404-520-1290.
Planning range, not a quote. Rounded outward to the nearest $100. Decking repairs and other scope-dependent extras may add cost.
Estimate breakdown
- Roof surface before waste
- Roof squares before waste
- Budget squares with 15% allowance
Budget squares × $325-$450 for asphalt, or $600-$1,200 for standing-seam metal. The allowance is already included in both totals.
Roof Prices at a Glance
Based on actual roof size, not home square footage. Every total below already includes 15% for waste.
| Measured roof size | Roof surface | Asphalt shingles | Standing-seam metal |
|---|---|---|---|
| 15 squares | 1,500 sq ft | $5,606 - $7,763 | $10,350 - $20,700 |
| 20 squares | 2,000 sq ft | $7,475 - $10,350 | $13,800 - $27,600 |
| 25 squares | 2,500 sq ft | $9,344 - $12,938 | $17,250 - $34,500 |
| 30 squares | 3,000 sq ft | $11,213 - $15,525 | $20,700 - $41,400 |
| 40 squares | 4,000 sq ft | $14,950 - $20,700 | $27,600 - $55,200 |
| 50 squares | 5,000 sq ft | $18,688 - $25,875 | $34,500 - $69,000 |
Base rates: $325-$450 per square for asphalt shingles and $600-$1,200 for standing-seam metal, before the 15% allowance. One square = 100 sq ft of roof surface. Rates supplied by Matt Olson, owner, September 16, 2026. These are BFA planning rates, not market averages. Actual waste and project scope vary.
Download the pricing data sheet (CSV)
Need a repair instead? Repairs generally range from $250 to $2,000 depending on scope. The 15% replacement allowance does not apply to that repair range. Roof repair pricing.
What Goes Into the Estimate?
Home size is a starting point, not a roof measurement. Garages, porches, unequal floors and complex roof shapes can change the result. Do not climb onto your roof to measure it.
Roof-size assumptions and examples
Estimated roof area = (above-ground living area ÷ equal-sized stories + extra covered footprint) × slope factor. Divide by 100 for roof squares. Then multiply by 1.15 once and apply the installation rate.
Low slope uses 4:12, moderate uses 6:12, steep uses 10:12, and very steep uses 12:12. Not sure uses 4:12 for the low budget and 12:12 for the high budget. These assumptions do not cover flat roofs, every possible slope, or additional steep-roof labor.
Slope factor = √(1 + (pitch ÷ 12)²). At 6:12, a 2,500 sq ft home with two equal floors and 400 sq ft of additional footprint has about 1,845 sq ft of roof. That is 18.4 measured squares, or 21.2 budget squares after the 15% allowance.
| Above-ground living area | One story | Two equal stories |
|---|---|---|
| 1,500 sq ft | 16.8 squares | 8.4 squares |
| 2,000 sq ft | 22.4 squares | 11.2 squares |
| 2,500 sq ft | 28.0 squares | 14.0 squares |
| 3,000 sq ft | 33.5 squares | 16.8 squares |
| 3,500 sq ft | 39.1 squares | 19.6 squares |
These are geometric examples, not observed averages. A measured estimate is needed for split levels, partial upper floors, mixed pitches, complex dormers, flat roofs or roofs outside the example range.
GAF's explanation of roofing squares. Prices and the 15% budget allowance are supplied by BFA, not GAF.
The Work Behind the Estimate
A Real Roof.
A Written Scope.
This Canton project included a CertainTeed Landmark Pro roof replacement and gutter coordination. The original drone photo shows shingle installation in progress.
Explore our project work →Serving Canton, Marietta, Alpharetta, Milton, Roswell and nearby North Metro Atlanta communities.
Roof Pricing Questions
How much does BFA charge for an asphalt shingle roof?
BFA's base planning rate is $325-$450 per roof square, including standard installation. Our calculator adds 15% to the replacement budget for waste. A 30-square measured roof therefore has a planning range of $11,212.50-$15,525 before other scope-dependent extras. A square is 100 square feet of roof surface. An inspection and written quote determine the final price.
How much does a standing-seam metal roof cost?
BFA's base planning rate is $600-$1,200 per roof square, including standard installation. With the 15% waste allowance, a 30-square measured roof has a planning range of $20,700-$41,400 before other scope-dependent extras. Panel specification, detailing, pitch, access and decking can change the final quote.
Does this estimate include waste?
Yes. Both replacement budgets include a 15% waste allowance, applied once: measured or estimated roof squares multiplied by 1.15, then multiplied by the base installation rate. The roof itself does not become 15% larger. Actual material waste varies by roof design and product; 15% is a planning allowance, not a guarantee. Do not add waste again to the displayed totals. Repair prices remain $250-$2,000 depending on scope.
What if I do not know my roof's steepness?
Choose Not sure. The calculator shows a wider budget using illustrative roof pitches from 4:12 to 12:12. These are assumptions, not measurements or local averages. Flat roofs, roofs outside that range, split levels, unequal floors and complex roofs need a measured estimate.
Is my home's square footage the same as my roof size?
No. The home-size estimate divides above-ground living area by the number of equal-sized stories, adds any additional covered area you enter, then adjusts for slope. It excludes garages, porches and overhangs unless you add them. Finished basements must not be counted as above-ground living area.
Is this a firm quote?
No. These are BFA planning budgets, not regional averages or binding quotes. Decking repairs, extra tear-off layers, difficult access, steep or complex sections, and specialty details may change the price. Roof pitch adjusts estimated surface area here; any additional steep-roof labor is determined in the written quote.
Get a Roof-Specific Written Quote
Measured roof area. Documented condition. A clear scope before work starts.
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