- Flat roof replacement usually costs $6,800 to $21,000, about $9,800 typical.
- Replacing a low-slope or flat roof with TPO, EPDM or modified bitumen.
What flat roof replacement costs
Flat roof replacement usually runs $6,800 to $21,000. A typical job lands near $9,800. Replacing a low-slope or flat roof with TPO, EPDM or modified bitumen. By the square foot, Fixr put it at $4 to $14, with $9 in the middle.
| Price | |
|---|---|
| Low end | $6,800 |
| Typical | $9,800 |
| High end | $21,000 |
| Per square foot | $4 to $14 |
National figures from Fixr, This Old House and Today's Homeowner, combined as shown below. Labor rates move the price by state: about $11,873 typical in Hawaii against $8,561 in Arkansas.
What drives the price
- Membrane. This Old House says modified bitumen is the most affordable at $6 to $13 a square foot.
- Size. Fixr prices a standard 1,000 to 1,500 square foot flat roof.
- Insulation and decking. Adding insulation boards or fixing rotted deck adds cost.
- Drainage. Ponding water needs tapered insulation or new drains.
Flat roof replacement cost by state
Estimates by state, made by Koira: the national flat roof replacement range with its labor part, roughly 55%, adjusted to local wages for construction and extraction workers. Real quotes vary with the job.
| State | Low | Typical | High |
|---|---|---|---|
| Alabama | $6,063 | $8,738 | $18,725 |
| Alaska | $7,810 | $11,255 | $24,118 |
| Arizona | $6,705 | $9,663 | $20,706 |
| Arkansas | $5,940 | $8,561 | $18,345 |
| California | $7,562 | $10,898 | $23,352 |
| Colorado | $6,903 | $9,949 | $21,319 |
| Connecticut | $7,559 | $10,894 | $23,344 |
| Delaware | $6,788 | $9,783 | $20,964 |
| District of Columbia | $7,464 | $10,756 | $23,049 |
| Florida | $6,160 | $8,878 | $19,023 |
| Georgia | $6,187 | $8,917 | $19,108 |
| Hawaii | $8,238 | $11,873 | $25,442 |
| Idaho | $6,587 | $9,493 | $20,342 |
| Illinois | $8,121 | $11,703 | $25,079 |
| Indiana | $6,945 | $10,009 | $21,448 |
| Iowa | $6,795 | $9,792 | $20,984 |
| Kansas | $6,513 | $9,386 | $20,112 |
| Kentucky | $6,398 | $9,220 | $19,757 |
| Louisiana | $6,196 | $8,930 | $19,136 |
| Maine | $6,848 | $9,870 | $21,149 |
| Maryland | $6,821 | $9,830 | $21,065 |
| Massachusetts | $7,926 | $11,423 | $24,478 |
| Michigan | $6,903 | $9,949 | $21,319 |
| Minnesota | $7,619 | $10,980 | $23,529 |
| Mississippi | $5,999 | $8,646 | $18,527 |
| Missouri | $6,937 | $9,998 | $21,424 |
| Montana | $6,889 | $9,928 | $21,274 |
| Nebraska | $6,438 | $9,279 | $19,883 |
| Nevada | $6,937 | $9,998 | $21,424 |
| New Hampshire | $6,834 | $9,849 | $21,105 |
| New Jersey | $7,674 | $11,059 | $23,699 |
| New Mexico | $6,194 | $8,926 | $19,128 |
| New York | $7,482 | $10,783 | $23,106 |
| North Carolina | $6,163 | $8,881 | $19,031 |
| North Dakota | $6,902 | $9,947 | $21,315 |
| Ohio | $6,963 | $10,035 | $21,504 |
| Oklahoma | $6,114 | $8,812 | $18,882 |
| Oregon | $7,213 | $10,395 | $22,275 |
| Pennsylvania | $6,861 | $9,888 | $21,190 |
| Rhode Island | $7,019 | $10,116 | $21,678 |
| South Carolina | $6,173 | $8,896 | $19,064 |
| South Dakota | $6,208 | $8,947 | $19,172 |
| Tennessee | $6,233 | $8,983 | $19,249 |
| Texas | $6,148 | $8,861 | $18,987 |
| Utah | $6,650 | $9,583 | $20,536 |
| Vermont | $6,812 | $9,817 | $21,036 |
| Virginia | $6,605 | $9,519 | $20,399 |
| Washington | $7,802 | $11,244 | $24,094 |
| West Virginia | $6,679 | $9,625 | $20,625 |
| Wisconsin | $7,057 | $10,171 | $21,795 |
| Wyoming | $6,813 | $9,819 | $21,040 |
Big metro areas often run above their state's figure.
How we got these numbers
| Guide | Range | Average | Use |
|---|---|---|---|
| Fixr | $4,000 to $21,000 | $8,000 | Counted |
| This Old House | $11,311 to $37,709 | $24,510 | Counted |
| Today's Homeowner | $6,800 to $12,798 | Not given | Counted |
How the flat roof replacement range is combined: low end from the middle of the guides' lows, high end from the middle of their highs, typical from the middle of their averages (a range's midpoint where no average is given). Figures read on each guide's page on October 9, 2026.
Labor share used: 55%. None of the guides splits labor out for this job, so this share is Koira's working assumption for roofing and gutters work. State factor: the state's median hourly wage for construction and extraction workers over the national $28.63 (BLS, May 2025), kept between 0.7 and 1.4.
For contractors: price this job in Koira
Roofs are priced by the square, so measure once, show the squares, the tear-off and the extras, and send it the same day.
With Koira's free Office plan, the flat roof replacement estimate, the deposit and the final invoice live in one place, sent by text. See estimates. Price this job in Koira, free.
Sources: Fixr, flat roof replacement cost; This Old House, flat roof replacement cost; Today's Homeowner, flat roof replacement cost; BLS Occupational Employment and Wage Statistics, May 2025 (state and national files). Prices checked October 9, 2026. More for your trade: how the trade runs on Koira.