Skylight Leak Repair Cost: 6 Fixes, Labor, And Prices

A dripping skylight doesn't just stain your ceiling, it can quietly rot the framing, insulation, and sheathing around it if you wait too long. The good news is that most leaks don't require a full replacement. The bad news? Skylight leak repair cost varies widely depending on the root cause, and it's hard to know what you're actually paying for without a clear breakdown of labor, materials, and repair type.

Some fixes run under $200. Others push past $1,500. The difference usually comes down to whether you're dealing with a simple sealant failure, damaged flashing, or a cracked pane, and whether the surrounding structure has taken water damage. Knowing which repair you need before calling a contractor puts you in a much stronger position to evaluate quotes.

At Legacy Exteriors, we handle skylight repairs and installations across Kirkland, Bellevue, Redmond, and the surrounding areas. We've seen every version of a skylight leak, from condensation misdiagnosed as a leak to flashing that was never installed correctly in the first place. This article breaks down six common skylight leak repairs, what each one costs, and when replacement makes more financial sense than another patch job.

1. Re-flash the skylight and integrate new underlayment

Flashing failure is the most common cause of skylight leaks, and it gets misdiagnosed more than any other issue. When water finds its way under the metal flashing or through dried-out underlayment, it travels along the roof deck and shows up far from the actual entry point. This gap between where the water enters and where it drips inside makes the source harder to pinpoint without a hands-on inspection.

What the crew does on the roof

The crew removes shingles in roughly a two-foot perimeter around your skylight, lifts the old flashing, and inspects the roof deck underneath for rot or soft spots. New step flashing gets woven into the shingle courses on both sides, and self-adhering underlayment gets laid under the saddle and head flashing before everything gets layered back into place.

When this fix makes sense

This repair fits your situation when the skylight unit itself is in good condition but you're seeing water intrusion along the side or top edges of the frame. If your home is more than 10 years old and the skylight was installed with basic aluminum flashing and no underlayment backup, worn flashing is almost always the culprit.

Properly integrated step flashing with self-adhering underlayment is one of the most durable long-term fixes available for a leaking skylight.

Typical labor time and who usually does it

A licensed roofer handles this repair, not a glazier. Most crews finish the job in 3 to 5 hours for a standard fixed skylight on a moderate-pitch roof. Steep pitches and skylights placed near ridges or hips add time and complexity.

Skylight leak repair cost range in the Seattle area

For a reflash with new underlayment in the Kirkland and greater Seattle area, expect to pay between $400 and $950. Materials typically run $80 to $150. The rest of the skylight leak repair cost is labor.

What can raise the price

Deck rot found during the repair is the most common cost driver. Replacing even a small section of sheathing adds $150 to $400. Homes with two stories or complex rooflines push labor hours higher regardless of the skylight condition.

Repair vs replace checkpoint

When your skylight frame is structurally sound and the glazing shows no fogging or cracks, reflashing is almost always worth the investment. Done correctly, this repair typically extends the life of your existing unit by 15 to 20 years.

2. Reseal the skylight perimeter and replace worn gaskets

Resealing is the least expensive fix on this list, but it only works when the leak comes from degraded sealant or compressed gaskets along the frame edge. It won't help if the flashing or surrounding deck is compromised.

What resealing can and cannot fix

Resealing addresses cracked or shrunk sealant that has pulled away from the frame due to age and thermal movement. It cannot fix flashing gaps, deck rot, or failed glazing seals. If water is entering from anywhere beyond the immediate frame perimeter, this fix won't stop the leak.

When this fix makes sense

This repair fits your situation when your skylight is under 15 years old, the frame is structurally sound, and you can see dried or separated sealant along the edge. New gaskets and fresh sealant can extend the unit's useful life by several years.

Common materials and application details that matter

A pro uses polyurethane or silicone sealant rated for roofing applications, along with EPDM gasket material for operable units. Surface preparation and primer matter more than sealant brand for a repair that holds.

Skipping surface prep is the most common reason a resealing job fails within a year.

Skylight leak repair cost range

Expect to pay $150 to $400 for professional resealing and gasket replacement on a standard fixed skylight.

What can raise the price

Difficult roof access adds labor time. Finding hidden frame damage during the job pushes the skylight leak repair cost higher than the baseline estimate.

Repair vs replace checkpoint

If you've resealed the same unit twice in five years, the frame is likely warped or the flashing needs full attention. At that point, resealing is a short-term measure rather than a real solution.

3. Replace failed skylight glass or the insulated glass unit

A cracked pane or a failed insulated glass unit (IGU) looks like a roof leak but behaves differently from flashing or sealant failure. Water enters through the glazing itself, and fixing it means replacing the glass rather than touching the surrounding roof components.

How to tell glass failure from a roof leak

Condensation trapped between two panes is the clearest sign an IGU seal has failed. If water drips directly from the glazing during rain with no ceiling staining around the frame edges, the glass unit is your source, not the flashing.

What the pro replaces and what stays

The installer pulls the glass unit or acrylic dome while leaving the frame and curb in place. If the frame is structurally sound, only the glazing gets swapped out, which keeps the job straightforward.

When this fix makes sense

This repair fits your situation when the frame and flashing are under 15 years old with no rot or corrosion present. Replacing just the glass costs significantly less than a full unit swap.

If your frame is intact and your flashing is solid, glass replacement delivers real value without the cost of a full tearout.

Skylight leak repair cost range

Expect to pay $300 to $800 for glass or IGU replacement on a standard fixed residential skylight, depending on size and glazing type.

What can raise the price

Tempered or laminated glass costs more than standard double-pane units. Skylights with custom sizing or unusual shapes require special orders that add both material cost and lead time to the overall skylight leak repair cost.

Repair vs replace checkpoint

If the frame shows corrosion, warping, or rot alongside the glass failure, full unit replacement is a smarter investment than putting new glass into a structurally compromised frame.

4. Repair the skylight curb and surrounding roof decking

The curb is the raised wooden frame that your skylight sits on top of. When water gets under flashing repeatedly, it soaks into that framing until the wood softens, compresses, and eventually rots. Most homeowners don't realize this is happening until the leak comes back after what seemed like a successful repair.

Why curb rot causes repeat leaks

A rotted curb no longer holds the skylight unit level or secure, which creates fresh gaps for water entry every time the structure shifts slightly with temperature changes. You can reseal and reflash a skylight as many times as you want, but if the curb underneath is soft, the leak will return.

What the repair includes

The crew removes the skylight unit, cuts out the deteriorated curb framing, and installs new pressure-treated lumber built to the same height and angle. If the roof decking around the opening has absorbed water, those damaged sections get sistered or replaced before anything goes back on top.

When this fix makes sense

This repair fits your situation when you've had two or more leaks in the same skylight and prior repairs didn't hold.

Skylight leak repair cost range

Expect to pay $500 to $1,200 for curb rebuilding and minor deck repair combined.

Rebuilding a compromised curb before reinstalling your skylight is far cheaper than dealing with structural damage to your ceiling or interior walls later.

What can raise the price

Extensive deck rot that spreads beyond the immediate curb area adds material and labor costs quickly. Homes with cathedral ceilings or complex roof geometry also increase the difficulty of this repair.

Repair vs replace checkpoint

If the skylight unit itself is under 20 years old and the glazing is intact, rebuilding the curb and keeping the existing unit is typically the better financial decision.

5. Fix venting skylight hardware, seals, or motor issues

Operable skylights that open and close have more leak potential than fixed units because they rely on mechanical components and compression seals that wear out over time. When those parts fail, water finds its way in even if the flashing and surrounding roof are in perfect condition.

Common leak points on operable skylights

The most frequent trouble spots are the weatherstripping along the sash perimeter, the hinge seals, and the gap where the motor shaft or manual crank arm passes through the frame. Each of these areas compresses thousands of times over the life of the unit.

Worn compression seals on an operable skylight cause leaks that look identical to flashing failures, which is why an accurate diagnosis matters before any repair begins.

What gets adjusted, rebuilt, or replaced

A technician inspects the sash alignment, hinge condition, and seal compression before deciding what to swap out. Motors on electric units get tested for proper close pressure since an underpowered or failing motor often leaves a small gap at the top of the sash.

When this fix makes sense

This repair fits your situation when your skylight opens and closes and the leak only appears during heavy rain or wind-driven rain.

Skylight leak repair cost range

Expect to pay $200 to $600 depending on whether the fix involves seals only or motor replacement.

What can raise the price

Discontinued motors or proprietary hardware from older units add parts sourcing time and cost to the total skylight leak repair cost.

Repair vs replace checkpoint

If the frame and glazing are sound, repairing the mechanical components is almost always cheaper than full replacement.

6. Replace the entire skylight unit

Sometimes the smartest financial move is a full replacement. When you've cycled through multiple repairs on the same unit and the leaks keep returning, the cumulative repair bills often approach or exceed the cost of a new skylight installed correctly.

When replacement beats chasing repairs

Your unit is a strong replacement candidate when it's over 20 years old, the frame shows corrosion or warping, and you've already paid for two or more repairs. At that point, you're spending money to extend the life of something approaching the end of its useful service window.

Replacing a failing skylight once is almost always cheaper than paying for the same repair two or three times over.

What a like-for-like replacement includes

A like-for-like swap means the installer removes your existing unit, inspects or rebuilds the curb, installs new flashing integrated into the surrounding shingles, and seats the new skylight to the manufacturer's specifications.

What to expect for interior work and paint

Most replacements require minor drywall patching and repainting around the interior ceiling trim. Budget an additional $100 to $300 for this finish work if your contractor doesn't include it in the base quote.

Skylight replacement cost range compared to repair

Full skylight replacement in the Seattle area typically runs $900 to $2,500, depending on unit size, glazing type, and roof complexity.

What can raise the price

Vented or motorized units cost more than fixed skylights. Custom sizing and premium laminated glazing push the total skylight leak repair cost noticeably higher than a standard swap.

How to compare quotes without surprises

Ask each contractor to itemize labor, materials, and interior finish work separately so you can compare line by line rather than just final totals.

Next steps

Now you have a clear picture of what each repair actually involves and what it costs. Resealing and gasket replacement sits at the low end of the skylight leak repair cost range, while full unit replacement with new flashing and interior finish work sits at the top. The right call depends on your skylight's age, the condition of the surrounding structure, and how many times you've already paid to fix the same problem.

Getting a quote from a contractor who can physically inspect the unit and the surrounding flashing gives you far more accurate numbers than any estimate made without seeing the roof. Legacy Exteriors handles skylight repairs and replacements across Kirkland, Bellevue, Redmond, Bothell, and the surrounding areas, and every quote comes with a locked-in price so there are no surprises at the end of the job. Request a free skylight inspection and get a clear answer on what your repair actually needs.