Skylights · Service

Skylight leak repair starts with where the water really enters

A wet ceiling under a skylight is a clue, not a diagnosis. Flashing, glass seals, condensation and the roof plane above the unit each need different fixes — and the wrong one leaves you buying a skylight that still drips.

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In short

What is skylight leak repair?

Skylight leak repair is the job of stopping active water intrusion at or near a skylight — after proving whether water enters at the flashing and curb, through the glazing unit, from condensation, or from a roof defect that only appears at the skylight opening. Caulk on the glass is rarely the durable answer. The durable answer is the detail that actually failed, sometimes including roof work beyond the skylight brand.

Triggers

Signs you need skylight leak repair

Active dripping or staining on the drywall well below a skylight after rain
Water trails on the shaft walls only during wind-driven storms
Wet insulation around the curb you can see from the attic
A recent roof or skylight “reseal” that did not change the leak pattern
Fog between panes plus separate drip stains — two problems, not one
Leak timing that matches ice dams or melting snow at the curb in cold climates
Stains appear only after wind-driven rain from one direction
Caulk was added repeatedly and the leak still returns
You see daylight or damp at the flashing step, not only on the glass

Seeing something not on this list? Browse skylights problems by symptom →

The job

How skylight leak repair actually works

Reproduce the conditions and map the wet path

Interior stains show where water leaves the assembly, not always where it enters. Attic access, moisture meters and controlled water testing (when safe) separate curb leaks from glass and from upslope roof issues.

Watch for: A bid that says “reseal skylight” without attic photos or a source hypothesis. That is hope in a caulk tube.
Temporary dry-in if contents are at risk

Tarping, interior containment and protecting finishes may come before perfect permanent work when storms are ongoing. Temporary is not the repair — label it as such.

Watch for: A temporary tarp sold as a permanent flashing fix. Schedule the real detail.
Flashing and curb repairs when that is the path

Step flashing, counterflashing, curb height and underlayment transitions are common failure points — especially after a reroof that treated the skylight as an obstacle. Repair may mean reflashing integrated with surrounding shingles or membrane.

Watch for: Surface silicone over failed step flashing. Water will go behind it.
Glazing and frame failures

Broken seals, cracked lenses and failed gaskets need unit or glass work, not roofing tar. Condensation that looks like a leak needs ventilation and humidity conversation, not necessarily exterior tear-off.

Watch for: Roofers quoting glass seal failures they cannot warranty. Right trade, right part.
Replace when the unit or installation is spent

Rotten curbs, obsolete units without parts, or repeated leaks after proper diagnosis push toward replacement. Leak repair should not become a multi-year caulk subscription on a doomed frame.

Watch for: Endless service calls that never open the roof. Cost the replacement path honestly.
Separate glass failure from flashing failure

Condensation, failed seals in insulated glass, and true weather leaks from curb flashing are different repairs. Treating everything with more roof caulk is how leaks migrate and decks rot.

Watch for: Tubes of sealant as the only tool on a flashing problem. Flashing is metal and membrane work, not a caulk sculpture.
Trace water path on a controlled wet test when safe

A careful hose test from low to high, or inspection after a documented rain, finds entry order. Interior stains are often distant from the entry point on the roof plane.

Watch for: High-pressure spraying that forces water into places rain never reaches, creating false positives.

Money

What does skylight leak repair cost?

Skylight leak repairs range from modest flashing work to full unit replacement with roof integration. Diagnosis time is part of the value — a cheap reseal that misses the source costs more than a thorough first visit. Surrounding roof repairs can dominate when upslope defects feed the opening.

See the full skylight leak repair cost guide — by material, size and region →

Straight answer

When skylight leak repair is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

The stain is old, dry and the roof already was replaced correctly. You may be looking at historic damage, not an active leak.
Interior humidity is condensing on cold glass with no exterior entry. Treat moisture load and ventilation; do not reroof a condensation problem.
The entire roof is at end of life. Coordinate skylight work with replacement rather than patching into a failing field.
You want a DIY tube of caulk on a multi-storey glass unit in winter. Fall risk and wrong detail — hire it.
A manufacturer warranty requires certified service you are about to void with random sealant. Read the warranty path first.
The unit is at end of life and glass is fogged with rotten wood curb. Repair theatre costs more than a planned replacement.
You only want interior paint over an active wet stain. Cosmetics without a roof fix guarantee a repeat stain.

Before you sign

What to check when hiring for skylight leak repair

What is your working theory of the water path, and can I see attic or exterior evidence?

Diagnosis quality is the product.
Is this flashing, glazing, condensation or upslope roof — and who does each part?

Trade boundaries prevent finger-pointing later.
What temporary protection is included if weather turns?

Active leaks need a plan for tonight, not only next week’s permanent work.
If reflashing, how will new work tie into existing shingles or membrane?

Integration is where callbacks live.
When do you recommend replacement instead of repair?

Honest thresholds save seasons of drips.
Are you diagnosing flashing, glass, or condensation — and how?

Wrong diagnosis means the wrong trade and a repeat leak.
Will repair include step flashing and counterflashing details, or only surface sealant?

Sealant-only “repairs” are temporary on most skylight curbs.
If the curb or shaft is rotten, what is the change path to replacement?

You want that conversation before the roof is open, not as a panic upsell mid-job.

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Local pros

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Related work

Often done at the same time

Skylight Repair

Broader non-leak faults

Skylight Replacement

When the unit is spent

Skylight Installation

New openings

Tubular Skylight

Tube daylight systems

All skylights services →

FAQ

Skylight Leak Repair — questions people ask

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Why does my skylight leak only sometimes?

Wind direction, rain volume, snow melt and debris at the curb change whether water reaches the failed detail. Intermittent leaks are still real — they just need weather-aware diagnosis rather than a sunny-day shrug.

Is skylight leak repair different from general skylight repair?

Leak work prioritises active water paths and often roof flashing integration. General repair also covers operators, hardware and non-leak seal issues. If water is entering, start with leak diagnosis.

Can I fix a skylight leak with caulk?

Sometimes a gasket detail accepts a manufacturer-approved sealant; most roof-side leaks need flashing work. Random exterior caulk often blocks weeps or fails quickly. Prefer diagnosis over tubes.

Will a new skylight stop the leak?

Only if the unit or its install was the problem. A new skylight flashed badly, or set into a still-failed roof plane, will leak again. Installation quality and roof integration decide outcomes.

Who should I call — roofer or skylight specialist?

If water appears weather-driven at the curb, a roofer experienced with skylight flashing is often first. If the glass unit itself failed, a skylight installer or glazing tech may lead. Many good contractors cover both; ask which hat they are wearing on your bid.

Is a skylight leak always the skylight’s fault?

No. Adjacent roofing, improper step flashing, failed counterflashing, ice dams and interior condensation all produce “skylight leak” calls. Diagnosis should include the roof plane and the shaft, not only the glass pane.

How long should a proper skylight leak repair last?

A flashing-correct repair should last years in normal conditions; sealant-only patches often fail within a season or two. Ask what system was restored — metal and membrane, or caulk.

Can I fix a skylight leak from inside?

Interior patches hide stains; they do not stop weather entry at the curb. Interior work is for drywall after the roof side is fixed and materials have dried.