The working
- 1. Floor plan1,000 sq ft on one floor, as a 1.5:1 rectangle = 25.8 ft × 38.7 ft1,000 sq ft
- 2. Add overhangs(25.8 ft + 3) × (38.7 ft + 3), for 1.5 ft eaves on every side1,203 sq ft footprint
- 3. Roof surface1,203 sq ft footprint × 1.054 (4/12 pitch multiplier)1,268 sq ft
- 4. Squares to order1,268 ÷ 100 = 12.7 squares, + 10% waste (gable roof)13.9 squares
- 5. Installed1,268 sq ft × $4–$6 per sq ft (architectural asphalt shingles, HomeGuide, Nov 7, 2025)$5,071 – $7,606
- 6. Tear-off1,268 sq ft × $1–$3 per sq ft to remove one layer (HomeGuide)$1,268 – $3,803
- 7. PermitFlat fee, set locally (HomeGuide, Fixr)$100 – $500
- 8. Installed totalSum, rounded to $100 under $10,000 and $500 above$6,400 – $12,000
Prices are published national installed ranges (mostly HomeGuide, updated Nov 7, 2025), the same ones the roof cost calculator uses, for a straightforward re-roof with one old layer torn off. They are not adjusted for your state; the calculator can do that. Decking repairs, access, steep or cut-up roofs and the contractor all move the final price, so get at least two written quotes.
Squares and the materials list come from the same math as the roof calculator, which works them out for your own measurements.
This 1,000 sq ft house at other pitches
| Pitch | Roof surface | Squares | Asphalt shingles | Standing-seam metal |
|---|---|---|---|---|
| 3/12 | 1,240 sq ft | 12.4 | $6,300 – $11,500 | $12,500 – $24,000 |
| 4/12 (this house) | 1,268 sq ft | 12.7 | $6,400 – $12,000 | $13,000 – $24,500 |
| 6/12 | 1,345 sq ft | 13.4 | $6,800 – $12,500 | $13,500 – $26,000 |
| 8/12 | 1,445 sq ft | 14.5 | $7,300 – $13,500 | $14,500 – $28,000 |
| 10/12 | 1,565 sq ft | 15.7 | $7,900 – $14,500 | $16,000 – $30,000 |
| 12/12 | 1,701 sq ft | 17.0 | $8,600 – $16,000 | $17,000 – $33,000 |
Published ranges are priced per square foot of roof, so a steeper pitch costs more here only because it has more roof. Many roofers also add a steep-roof charge from about 7/12 or 8/12.
Same 1,000 sq ft, one storey or two (4/12, gable roof)
| House | Roof footprint | Squares | Asphalt shingles |
|---|---|---|---|
| One storey (this house) | 1,203 sq ft | 12.7 | $6,400 – $12,000 |
| Storey and a half | 834 sq ft | 8.8 | $4,500 – $8,400 |
| Two storeys | 646 sq ft | 6.8 | $3,500 – $6,600 |
Small, low gable roofs are the simplest to re-roof: short ridges, no hips or valleys, and a crew that can walk the whole roof. The permit is a bigger share of the total on a small job.
Materials to order (asphalt shingles, gable roof)
| Material | Quantity | How it is worked out |
|---|---|---|
| Shingles | 42 bundles | 13.94 squares with 10% waste × 3 bundles per square |
| Synthetic underlayment | 2 rolls | 1,394 sq ft ÷ 1,000 sq ft per roll |
| Ice & water shield | 2 rolls | 3 ft along 85 ft of eaves, +5% laps |
| Starter strip | 2 bundles | 145 ft of eaves and rakes +5% ÷ 100 ft per bundle |
| Drip edge | 16 10 ft pieces | 145 ft of eaves and rakes +5% for laps |
| Hip & ridge cap | 2 bundles | 42 ft of ridges and hips +5% ÷ 25 ft per bundle |
Did hail hit your area? Insurance often covers hail damage. Check hail history for your city, with storm reports back to 1955.
Questions people ask
How many squares is a 1,000 sq ft house roof?
About 12.7 squares for this one-storey cottage at 4/12, or 13.9 to order with 10% waste. The tables show how storeys and pitch change that.
How many bundles of shingles for a 1,000 sq ft house?
About 42 bundles of architectural shingles at three bundles per square, including 10% waste for a gable roof.
What would standing-seam metal cost instead?
About $13,000 – $24,500 installed on the same roof, against $6,400 – $12,000 for asphalt, including tear-off of one old layer and a permit.
Is 4/12 a common pitch for a 1,000 sq ft house?
Yes, and it is walkable with care. The multiplier is 1.054, so the roof is 1,268 sq ft over a 1,203 sq ft footprint.
More roof cost guides
- Roof cost for a 1,200 sq ft house
- Roof cost for a 1,500 sq ft house
- Roof cost for a 1,800 sq ft house
- Roof cost for a 2,000 sq ft house
- Roof cost for a 2,200 sq ft house
- Roof cost for a 2,500 sq ft house
- Roof cost for a 3,000 sq ft house
- Roof cost for a 3,500 sq ft house
- Roof cost for a 4,000 sq ft house
- Flat roof cost and squares
- 3/12 pitch roof: multiplier, angle and cost
- 4/12 pitch roof: multiplier, angle and cost
- 5/12 pitch roof: multiplier, angle and cost