Replacing a leaking or fogged skylight costs $1,050 to $2,600 when done as a standalone roof call, or 35% to 45% less when bundled with a roof replacement while the surrounding shingles are already off. Price flashing-only reseals, like-for-like curb or deck-mounted replacements, and new roof openings with drywall light shafts.
Reviewed 25 October 2026 · Written by Mantu Kumar
See the illustrated inspection guide · Interactive system diagram
Sources: 2026 International Residential Code (IRC Section R308.6 Skylights and Sloped Glazing), ENERGY STAR / NFRC skylight ratings, and U.S. roofing contractor benchmarks.
2026 planning ranges
Bundle with a new roof: Swapping while the shingles are off saves about $350–$750 per skylight in tear-back labor.
Diagram, part by part
The skylight replacement & flashing drawing above has 9 numbered parts, from Curb-mount swap to More than one skylight. Each card below frames one of them, and after you run the calculator it shows what that part adds to your estimate.
$1,050–$2,400
A curb-mounted skylight sits on a wooden box built up from the roof. Swapping the unit usually keeps the curb and its flashing details.
On the quote: Ask whether the curb is sound or needs rebuilding.
$1,250–$2,750
A deck-mounted skylight fastens directly to the roof deck with its own flashing kit. It sits lower and looks cleaner, but needs the kit installed exactly to the maker’s steps.
On the quote: Make sure the maker’s flashing kit is in the price.
$350–$950
New flashing and an ice barrier collar around the unit. Most skylight leaks are flashing, not glass, so this line matters more than the unit price.
On the quote: Ask whether the shingles around the skylight are replaced or reused.
$1,700–$3,750
A venting skylight opens for fresh air, manually or with a motor and rain sensor. It adds cost but helps kitchens and bathrooms.
On the quote: Check for a rain sensor if it is motorized.
$2,400–$5,400+
Cutting a new opening means framing between rafters and building a drywall light shaft down to the ceiling. This is carpentry and drywall, not just roofing.
On the quote: Confirm whether the shaft drywall and paint are included.
$650–$1,350
A tubular skylight pipes daylight through a small reflective tube. It needs no framing and suits closets and hallways.
On the quote: Ask for the tube length and the diffuser style.
$450–$1,200
Old skylight leaks often stain the drywall shaft below. Patching, insulating and repainting the shaft finishes the job inside and stops condensation on cold days.
What moves it: Shaft size and how much drywall is stained.
On the quote: Ask whether the shaft is insulated and painted or only patched.
$125–$350
Replacing a skylight usually needs a disposal allowance for the old unit, and cutting a new opening often needs a building permit because it changes the roof framing.
What moves it: Scope and your town's rules.
On the quote: Ask who pulls the permit for a new opening.
Priced per unit
Each skylight has its own unit, flashing and labor, but doing several at once shares setup and travel. It is often best to replace them all while the roof is open.
What moves it: The number and size of skylights.
On the quote: Ask for a per-skylight price and a total for doing them together.
Curb, flashing & shaft scope
A standard fixed glass skylight costs $350 to $850 on the shelf, but making it watertight on a sloped roof requires stripping surrounding shingles, wrapping the curb in self-adhering ice-and-water membrane, and weaving manufacturer step, sill, and head saddle flashing.
Zoom in on three spots in the photo: these are the lines a skylight replacement & flashing bid should spell out. These close-ups are crops of the same AI-generated illustration.
Curb-mounted skylights sit like a shoebox lid over a framed 2×6 wood box on the roof—making replacement faster ($1,050–$2,400). Deck-mounted skylights nail directly to the OSB roof sheathing and integrate their own flashing.
Manufacturer warranties (such as VELUX 10-year no-leak installation warranties) require self-adhering waterproof underlayment wrapped up the sides of the curb before any metal flashing is installed.
Every skylight replacement needs a new model-matched aluminum or copper flashing kit ($120–$280). Reusing bent flashing or smearing black roof tar around the frame guarantees a leak within two winters.
Skylight quotes fall into three distinct scopes: reflashing an existing sound skylight, replacing an old acrylic bubble or fogged glass unit in an existing opening, or cutting a brand-new opening through the roof rafters and ceiling:
| Skylight Scope / Unit Type | Unit & Flashing Material | Labor & Roof Tie-In | 2026 Installed Total |
|---|---|---|---|
| Flashing Kit & Ice Barrier Reseal Only | $120 – $300 | $230 – $650 | $350 – $950 |
| Tubular Skylight (10"–14" Solar Tube) | $280 – $600 | $370 – $750 | $650 – $1,350 |
| Fixed Curb-Mounted Low-E Skylight (Existing Curb) | $450 – $1,050 | $600 – $1,350 | $1,050 – $2,400 |
| Fixed Deck-Mounted Low-E Skylight (Existing Opening) | $550 – $1,250 | $700 – $1,500 | $1,250 – $2,750 |
| Manual or Electric / Solar-Powered Venting Skylight | $950 – $2,100 | $750 – $1,650 | $1,700 – $3,750 |
| Cut New Opening + Rafter Headers + Drywall Light Shaft | $850 – $1,900 | $1,550 – $3,500 | $2,400 – $5,400+ |
Before ordering a replacement skylight or comparing quotes, check how your current skylight attaches to the roof:
Skylights and architectural asphalt shingles share a similar 20-to-25-year rubber gasket and flashing lifespan. If your skylight is 12+ years old when you replace your roof, keeping the old skylight is a false economy: the roofer still charges $250 to $450 to reflash the old unit, and if the glass seal fogs or the acrylic dome cracks 4 years later, a crew must tear into your brand-new shingles to swap the unit. Replacing the skylight while the roof deck is already bare saves $350 to $750 per skylight in duplicate labor and synchronizes both warranties.
| Line Item | 2026 Planning Range |
|---|---|
| Curb-mounted Low-E laminated skylight + flashing kit & roof labor | $900 – $2,100 |
| Municipal permit & disposal allowance | $125 – $300 |
| Planning total (interior shaft left untouched) | $1,025 – $2,400 |
If interior drywall inside the light tunnel is water-stained and needs re-taping and painting, add $400 to $1,200.
The calculator's default skylight replacement job, repriced for each of its six regions. At the national average it runs $1,075 – $2,500; South / Lower Midwest is the lowest at $935 – $2,175, and West Coast metro is the highest at $1,398 – $3,250, a gap of about $769 at the midpoint.
| Region | Planning range | Midpoint |
|---|---|---|
| National average | $1,075 – $2,500 | $1,788 |
| South / Lower Midwest | $935 – $2,175 | $1,555 |
| Mountain / Plains | $1,021 – $2,375 | $1,698 |
| Mid-Atlantic / Upper Midwest | $1,204 – $2,800 | $2,002 |
| Northeast metro | $1,355 – $3,150 | $2,252 |
| West Coast metro | $1,398 – $3,250 | $2,324 |
Every other input stays at its default and only “Project scope” changes. The cheapest choice, Step flashing kit & ice-barrier reseal only, comes to $350 – $1,050; the most expensive, Cut new roof opening + frame drywall light shaft, comes to $2,375 – $5,250.
| Choice | Planning range | Midpoint vs default |
|---|---|---|
| Step flashing kit & ice-barrier reseal only | $350 – $1,050 | −$1,088 |
| Replace existing skylight unit + new flashing (default) | $1,075 – $2,500 | — |
| Upgrade to electric / solar-powered venting skylight | $1,775 – $3,900 | +$1,050 |
| Cut new roof opening + frame drywall light shaft | $2,375 – $5,250 | +$2,025 |
Every other input stays at its default and only “Interior drywall shaft work” changes. The cheapest choice, Leave existing interior shaft untouched, comes to $1,075 – $2,500; the most expensive, Patch, insulate & repaint stained drywall shaft (+$450–$1,200), comes to $1,525 – $3,700.
| Choice | Planning range | Midpoint vs default |
|---|---|---|
| Leave existing interior shaft untouched (default) | $1,075 – $2,500 | — |
| Patch, insulate & repaint stained drywall shaft (+$450–$1,200) | $1,525 – $3,700 | +$825 |
Using the default job, a $1,000 deductible and a 20-year expected life. At 10 years old, about $894 is held back as depreciation; a replacement cost policy releases it after the work is finished, while an actual cash value policy keeps it.
| Age | Wear | First check | Held back |
|---|---|---|---|
| 2 years | 10% | $609 | $179 |
| 5 years | 25% | $341 | $447 |
| 10 years | 50% | $0 | $894 |
| 15 years | 75% | $0 | $1,341 |
| 20 years | 80% | $0 | $1,430 |
| 30 years | 80% | $0 | $1,430 |
Most skylight leaks come from flashing, so check that before the unit price.
| Stage | Typical time | What happens |
|---|---|---|
| Measuring | 1 hour | Opening size and roof pitch. |
| Ordering | 1 – 4 weeks | Venting and custom sizes take longer. |
| Replacement | 0.5 – 1 day | Unit and flashing. |
| New opening | 1 – 2 days | Framing and shaft. |
| Shaft finish | 1 – 3 days | Drywall and paint. |
Plan skylight work for dry weather; the roof is open while the old unit comes out.
Skylight work costs less when timed with the roof.
Leaks and fogging are the main signs.
Replacing an existing skylight like-for-like typically costs $1,050 to $2,400 for a curb-mounted fixed Low-E glass unit, or $1,250 to $2,750 for a deck-mounted unit, including the new flashing kit, ice-and-water membrane, and shingle tie-in labor. Cutting a brand-new skylight opening with a framed drywall light shaft runs $2,400 to $5,400+.
Yes, if the skylight is under 10 to 12 years old, uses modern double-pane Low-E glass with intact perimeter gaskets, and the leak is purely in the step flashing. A flashing-only reseal costs $350 to $950.
Replacing a skylight during a full roof replacement typically saves $350 to $750 per skylight because the roofing crew does not have to carefully pry up, unseal, and weave back existing brittle shingles around the curb.
A curb-mounted skylight sits over a raised 2x6 wood frame built on top of the roof deck and is standard on low-slope roofs or retrofits. A deck-mounted skylight nails directly to the flat roof sheathing with an integrated flange for a lower profile on roofs with at least a 3:12 pitch.
Under IRC Section R308.6, skylights installed over habitable rooms must use safety glazing—typically a tempered outer pane paired with a laminated inner pane.
Yes. Hail-cracked skylight glass or wind/tree damage is a covered peril under Coverage A Dwelling, subject to your deductible and ACV depreciation.
A sudden opening, such as wind lifting the flashing, can be. A unit that has sweated or dripped for years is often wear, and an actual cash value policy depreciates it. The stained ceiling is a separate repair.
Yes. A venting skylight that opens, manually or with a motor, costs more than a fixed unit and may need wiring or a solar panel for the motor. It can help clear heat and moisture in kitchens and bathrooms.
They can in sunny climates. Low-E glass, tinted glazing, blinds and venting units reduce heat gain, and north-facing skylights bring in softer light with less heat.
Many skylights last 15 to 25 years before glass seals or flashing need replacement. Replacing them with the roof avoids paying for flashing twice.
They brighten kitchens, bathrooms and hallways and can appeal to buyers, but only if they are leak-free. A stained shaft can worry buyers more than a room without one.
Usually not. Most of the work, including removing the old unit and installing flashing, happens on the roof; the inside shaft is finished afterward.
Yes. Skylight makers sell flashing kits designed for each model and roof type, and using the matching kit is key to a leak-free install and the warranty.
A small dome on the roof connected to a reflective tube that brings daylight into hallways, closets and bathrooms without framing a full skylight.
Most skylight leaks come from the flashing, not the glass. A new flashing kit with an ice barrier collar runs about $350 to $950 in this calculator, while a fogged or cracked unit usually means a full replacement at about $1,050 to $2,600 as a standalone job. Add about $450 to $1,200 if the drywall shaft below is stained and needs repair.
When the skylight replacement & flashing quote touches the claim or another part of the house, start here.
Direct planning topics covered in the calculator and guide above.