- Dormer installation usually costs $9,000 to $27,500, about $18,000 typical.
- Adding one dormer to an existing roof, framed, roofed and finished outside.
What dormer installation costs
Dormer installation usually runs $9,000 to $27,500. A typical job lands near $18,000. Adding one dormer to an existing roof, framed, roofed and finished outside.
| Price | |
|---|---|
| Low end | $9,000 |
| Typical | $18,000 |
| High end | $27,500 |
The range blends HomeAdvisor and Today's Homeowner (method below). Where you live matters: Koira's estimate is $15,725 in Arkansas and $21,807 in Hawaii.
What drives the price
- Type. Shed dormers are simpler. Gable and hipped dormers need more framing and roofing.
- Size. Wider dormers add more usable room and cost more.
- Inside finish. Today's Homeowner notes the structural price does not include finishing the room inside.
- Structure. Rafters cut for the dormer need headers and sometimes an engineer.
Extra costs to plan for
| Item | Price | Source |
|---|---|---|
| Permits | $400 to $2,000 | HomeAdvisor |
These often show up as separate lines. When you compare dormer installation quotes, line them up item by item.
Dormer installation cost by state
Koira estimates for each state, built from the national $9,000 to $27,500. About 55% of a dormer installation price is labor, and only that part is scaled by the state's median wage for construction and extraction workers. A starting point, not a quote.
| State | Low | Typical | High |
|---|---|---|---|
| Alabama | $8,025 | $16,050 | $24,520 |
| Alaska | $10,336 | $20,673 | $31,584 |
| Arizona | $8,874 | $17,748 | $27,114 |
| Arkansas | $7,862 | $15,725 | $24,024 |
| California | $10,008 | $20,016 | $30,580 |
| Colorado | $9,137 | $18,273 | $27,917 |
| Connecticut | $10,005 | $20,009 | $30,569 |
| Delaware | $8,984 | $17,969 | $27,452 |
| District of Columbia | $9,878 | $19,757 | $30,184 |
| Florida | $8,153 | $16,306 | $24,911 |
| Georgia | $8,189 | $16,378 | $25,022 |
| Hawaii | $10,904 | $21,807 | $33,316 |
| Idaho | $8,718 | $17,436 | $26,639 |
| Illinois | $10,748 | $21,496 | $32,841 |
| Indiana | $9,192 | $18,384 | $28,086 |
| Iowa | $8,993 | $17,986 | $27,479 |
| Kansas | $8,620 | $17,239 | $26,338 |
| Kentucky | $8,467 | $16,935 | $25,873 |
| Louisiana | $8,201 | $16,402 | $25,059 |
| Maine | $9,064 | $18,128 | $27,695 |
| Maryland | $9,028 | $18,055 | $27,585 |
| Massachusetts | $10,490 | $20,981 | $32,054 |
| Michigan | $9,137 | $18,273 | $27,917 |
| Minnesota | $10,084 | $20,168 | $30,812 |
| Mississippi | $7,940 | $15,880 | $24,262 |
| Missouri | $9,182 | $18,363 | $28,055 |
| Montana | $9,118 | $18,235 | $27,859 |
| Nebraska | $8,521 | $17,042 | $26,037 |
| Nevada | $9,182 | $18,363 | $28,055 |
| New Hampshire | $9,045 | $18,090 | $27,637 |
| New Jersey | $10,157 | $20,313 | $31,034 |
| New Mexico | $8,198 | $16,396 | $25,049 |
| New York | $9,903 | $19,805 | $30,258 |
| North Carolina | $8,156 | $16,313 | $24,922 |
| North Dakota | $9,135 | $18,270 | $27,912 |
| Ohio | $9,216 | $18,432 | $28,160 |
| Oklahoma | $8,092 | $16,185 | $24,726 |
| Oregon | $9,546 | $19,093 | $29,169 |
| Pennsylvania | $9,081 | $18,163 | $27,748 |
| Rhode Island | $9,290 | $18,581 | $28,388 |
| South Carolina | $8,170 | $16,340 | $24,964 |
| South Dakota | $8,217 | $16,434 | $25,107 |
| Tennessee | $8,250 | $16,499 | $25,207 |
| Texas | $8,137 | $16,275 | $24,864 |
| Utah | $8,801 | $17,602 | $26,892 |
| Vermont | $9,016 | $18,031 | $27,548 |
| Virginia | $8,742 | $17,485 | $26,713 |
| Washington | $10,326 | $20,652 | $31,552 |
| West Virginia | $8,839 | $17,678 | $27,009 |
| Wisconsin | $9,341 | $18,681 | $28,541 |
| Wyoming | $9,017 | $18,035 | $27,553 |
Rural areas and cities in the same state can differ a lot.
How we got these numbers
| Guide | Range | Average | Use |
|---|---|---|---|
| HomeAdvisor | $6,000 to $25,000 | $15,000 | Counted |
| Today's Homeowner | $12,000 to $30,000 | Not given | Counted |
We take the middle of the guides' lows for the low end, the middle of their highs for the high end, and the middle of their averages for the typical dormer installation price. Where a guide gives no average we use its midpoint. All read 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.
On Koira's free Office plan you build the estimate, text it, collect the deposit and turn it into an invoice when the dormer installation is done. Price this job in Koira, free.
Sources: HomeAdvisor, dormer installation cost; Today's Homeowner, dormer installation 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.