Cost to replace a 1,800 square foot roof, by roofing type
Roofers price by the square, and one square is 100 square feet, so a 1,800 square foot roof is 18 squares. The table multiplies 18 squares by the low and high installed cost of each roofing. The last column adds tearing off the old roof at $100 to $500 per square, which is $1,800 to $9,000 on this roof.
| Roofing | Per square foot | Per square | 18 squares, no tear-off | With tear-off |
|---|---|---|---|---|
| Asphalt shingles | $4 to $12 | $400 to $1,200 | $7,200 to $21,600 | $9,000 to $30,600 |
| Standing seam metal | $4 to $30 | $400 to $3,000 | $7,200 to $54,000 | $9,000 to $63,000 |
| Wood shingles | $7 to $15 | $700 to $1,500 | $12,600 to $27,000 | $14,400 to $36,000 |
| Clay shingles | $12 to $25 | $1,200 to $2,500 | $21,600 to $45,000 | $23,400 to $54,000 |
| Slate | $12 to $25 | $1,200 to $2,500 | $21,600 to $45,000 | $23,400 to $54,000 |
These are HomeAdvisor's national ranges for materials and installation together, not prices for your area. On 18 squares, every $100 a roofer adds or takes off per square moves the total by $1,800. The starting prices come from the store listings and cost guides under Sources, last checked in October 2026. Prices vary by region and season, so change any price to match your store or your quote.
What moves the price on a 1,800 square foot roof
A roof replacement is the cheapest time to fix the things that sit on or next to the roof. HomeAdvisor puts new gutters at $1,000 to $6,500 and a skylight at $1,600 to $4,200, and both are easier to do while the roof is open.
Next to what most people pay
HomeAdvisor says most homeowners spend $6,138 to $13,994 on a new shingle roof, $10,066 on average. Spread over 1,800 square feet, the average of $10,066 works out to $5.59 per square foot, all in. That sits in the lower half of the $4 to $12 the guide gives for the roof alone, before the $1 to $5 for a tear-off.
It also says labor is about 60 percent of a new shingle roof, at $1.50 to $4.00 per square foot, which is $2,700 to $7,200 on 18 squares. Booking in peak construction season can add 15 to 30 percent; on the middle of this roof's asphalt estimate, $19,800, that is $2,970 to $5,940.
Planning a 1,800 square foot roof
Make a list before you get quotes: gutters, skylights, attic vents, a chimney that needs new flashing. Ask each roofer to price them as separate lines, so you can compare the roofs and the extras apart.
How the 1,800 square foot estimate is worked out
- Squares = 1,800 ÷ 100 = 18
- New asphalt shingle roof = 18 × $400 = $7,200 at the low end, and 18 × $1,200 = $21,600 at the high end
- Tear-off = 18 × $100 = $1,800 at the low end, and 18 × $500 = $9,000 at the high end
- Estimate = $7,200 + $1,800 = $9,000 at the low end, and $21,600 + $9,000 = $30,600 at the high end
If a quote already includes the tear-off, choose No tear-off in the calculator above so it is not counted twice.
Shingles for a 1,800 square foot roof, materials only
Doing it yourself, the shingles and felt cost about $2,874: 60 bundles of architectural shingles at $44.99 and 5 rolls of #15 felt at $34.99, with 10 percent waste, at McCoy's Building Supply prices checked in October 2026.
| 1,800 square foot roof in asphalt shingles | Cost |
|---|---|
| Shingles and felt, materials only | About $2,874 |
| Installed by a roofer, no tear-off | $7,200 to $21,600 |
| Installed by a roofer, with tear-off | $9,000 to $30,600 |
The gap of $4,326 to $18,726 is the roofer's labor and costs, plus the nails, drip edge, flashing, vents, ridge cap, delivery and tax the materials figure leaves out. The 1,800 square foot shingle order has the full list.
Is your roof really 1,800 square feet?
The most common mistake in a roof estimate is using the floor area as the roof area. This table works back from a 1,800 square foot roof to the house under it, 4 feet long for every 3 wide with 12 inch overhangs.
| Roof pitch | Pitch multiplier | Flat area covered | House that fits | Floor area |
|---|---|---|---|---|
| 4 in 12 | 1.054 | 1,708 sq ft | 45 by 34 ft | 1,530 sq ft |
| 6 in 12 | 1.118 | 1,610 sq ft | 44 by 33 ft | 1,452 sq ft |
| 8 in 12 | 1.202 | 1,498 sq ft | 42 by 32 ft | 1,344 sq ft |
| 10 in 12 | 1.302 | 1,383 sq ft | 41 by 31 ft | 1,271 sq ft |
| 12 in 12 | 1.414 | 1,273 sq ft | 39 by 29 ft | 1,131 sq ft |
At 6 in 12, a 1,800 square foot roof sits over a house of about 44 by 33 feet, with 1,452 square feet of floor. Going the other way, a one-story house with 1,800 square feet of floor has about 2,209 square feet of roof at the same pitch and overhangs. In asphalt shingles with a tear-off, that roof is about $11,000 to $37,600, close to the figures for a 2,200 square foot roof.
A two-story house with 1,800 square feet of floor space has about 900 on each level, so its roof is about 1,146 square feet, close to a 1,200 square foot roof. A garage or porch adds its own roof area; the roof area calculator measures yours.
Before you sign
Check that the quote says new flashing, not reused. Flashing around chimneys, walls and skylights is where many leaks start, and reusing old flashing under new shingles is a common way to cut a price.
Other roof sizes
In asphalt shingles with a tear-off, a 1,500 square foot roof is $7,500 to $25,500 and a 2,000 square foot roof is $10,000 to $34,000.
1,000 sq ft1,200 sq ft1,500 sq ft2,000 sq ft2,200 sq ft2,500 sq ft3,000 sq ft3,500 sq ft4,000 sq ft
Common questions
How much does it cost to replace a 1,800 square foot roof?
About $9,000 to $30,600 with asphalt shingles and a tear-off, or $7,200 to $21,600 without, by HomeAdvisor's national figures. Quotes from roofers in your area are the only firm number.
How much does a 1,800 square foot metal roof cost?
For standing seam metal, about $7,200 to $54,000 before tear-off, at HomeAdvisor's $4 to $30 per square foot installed. The range is wide because it covers metals from steel and aluminum up to zinc and copper.
How much does it cost to tear off a 1,800 square foot roof?
About $1,800 to $9,000, at HomeAdvisor's $1 to $5 per square foot for removing and hauling away the old roofing. Some quotes already include it.
Should I replace gutters when I replace the roof?
If they are old, it is the easiest time. HomeAdvisor puts gutter installation at $1,000 to $6,500, and the drip edge and the gutters meet at the eaves, so doing both together avoids pulling the new roof edge apart later.
How much to add a skylight during a roof replacement?
HomeAdvisor puts skylight installation at $1,600 to $4,200. Adding one while the old roof is off saves cutting into a new roof later.
Is a 1,800 square foot roof the same as a 1,800 square foot house?
No. A one-story house with 1,800 square feet of floor has about 2,209 square feet of roof at 6 in 12 with 12 inch overhangs, and a 1,800 square foot roof fits a one-story house of about 1,452 square feet.
Sources
- HomeAdvisor: shingle roof replacement cost, with removal of the old roof
- HomeAdvisor: standing seam metal roof cost
- McCoy's Building Supply: roof shingle prices
- McCoy's Building Supply: roofing underlayment prices
Facts on this page were last checked against these sources in October 2026.