Roof Cost for a 3,500 sq ft House (2026 Prices)

Roof cost for a 3,500 sq ft house

Worked out for a 3,500 sq ft two-storey house with dormers with a 8/12 cut-up (valleys, dormers) roof, with tables for other pitches, storeys and materials.

3,500 sq ft · two-storey house with dormers · 8/12

$12,000 – $22,500

2,422 sq ft of roof, 29.1 squares to order (20% waste) · installed, incl. tear-off of one layer and a permit

Change the numbers in the roof cost calculator

The working

1. Floor plan3,500 sq ft ÷ 2 storeys = 1,750 sq ft per floor = 34.2 ft × 51.2 ft1,750 sq ft
2. Add overhangs(34.2 ft + 3) × (51.2 ft + 3), for 1.5 ft eaves on every side2,015 sq ft footprint
3. Roof surface2,015 sq ft footprint × 1.202 (8/12 pitch multiplier)2,422 sq ft
4. Squares to order2,422 ÷ 100 = 24.2 squares, + 20% waste (cut-up (valleys, dormers) roof)29.1 squares
5. Installed2,422 sq ft × $4–$6 per sq ft (architectural asphalt shingles, HomeGuide, Nov 7, 2025)$9,688 – $14,532
6. Tear-off2,422 sq ft × $1–$3 per sq ft to remove one layer (HomeGuide)$2,422 – $7,266
7. PermitFlat fee, set locally (HomeGuide, Fixr)$100 – $500
8. Installed totalSum, rounded to $100 under $10,000 and $500 above$12,000 – $22,500

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 3,500 sq ft house at other pitches

Pitch	Roof surface	Squares	Asphalt shingles	Standing-seam metal
3/12	2,077 sq ft	20.8	$10,500 – $19,000	$21,000 – $40,000
4/12	2,124 sq ft	21.2	$10,500 – $19,500	$21,500 – $41,000
6/12	2,253 sq ft	22.5	$11,500 – $21,000	$22,500 – $43,500
8/12 (this house)	2,422 sq ft	24.2	$12,000 – $22,500	$24,500 – $46,500
10/12	2,623 sq ft	26.2	$13,000 – $24,000	$26,500 – $50,500
12/12	2,850 sq ft	28.5	$14,500 – $26,000	$28,500 – $54,500

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 3,500 sq ft, one storey or two (8/12, cut-up (valleys, dormers) roof)

House	Roof footprint	Squares	Asphalt shingles
One storey	3,871 sq ft	46.5	$23,500 – $42,500
Storey and a half	2,638 sq ft	31.7	$16,000 – $29,000
Two storeys (this house)	2,015 sq ft	24.2	$12,000 – $22,500

Dormers add valleys, step flashing and short courses of shingles. Ask each roofer how they will flash the dormer walls; it is where leaks start.

Materials to order (asphalt shingles, cut-up (valleys, dormers) roof)

Material	Quantity	How it is worked out
Shingles	88 bundles	29.06 squares with 20% waste × 3 bundles per square
Synthetic underlayment	3 rolls	2,906 sq ft ÷ 1,000 sq ft per roll
Ice & water shield	2 rolls	3 ft along 110 ft of eaves + 3 ft along 16 ft of valleys, +5% laps
Starter strip	3 bundles	198 ft of eaves and rakes +5% ÷ 100 ft per bundle
Drip edge	21 10 ft pieces	198 ft of eaves and rakes +5% for laps
Hip & ridge cap	3 bundles	55 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 3,500 sq ft house roof?

About 24.2 squares for this two-storey house with dormers at 8/12, or 29.1 to order with 20% waste. The tables show how storeys and pitch change that.

How many bundles of shingles for a 3,500 sq ft house?

About 88 bundles of architectural shingles at three bundles per square, including 20% waste for a cut-up (valleys, dormers) roof.

What would standing-seam metal cost instead?

About $24,500 – $46,500 installed on the same roof, against $12,000 – $22,500 for asphalt, including tear-off of one old layer and a permit.

Is a 3,500 sq ft two-storey roof cheaper than a ranch?

Usually, yes. Spread over two floors, the house needs about 24.2 squares instead of 46.5 for a one-storey 3,500 sq ft ranch at the same 8/12 pitch: about $12,000 – $22,500 against $23,500 – $42,500.