Common Problems & Warning Signs
Before repair, it helps to know what might be wrong. Here are typical issues with skylights:
| Problem | Symptoms | Likely Cause |
|---|---|---|
| Leaks / water infiltration | Water stains around frame, dripping, moisture on ceiling | Failed seals, deteriorated flashing, improperly installed flashing, roof damage |
| Cracked or broken glass | Visible crack, shattered pane, leaks | Impact (hail, debris), thermal stress, manufacturing defect |
| Fogging / condensation between panes | Cloudiness inside the glazing, moisture trapped | Seal failure in double/triple glazing, insulating gas loss |
| Frame deterioration | Rotting wood, rust, warped frame | Moisture exposure, age, poor maintenance |
| Mechanical / operational failure | Skylight won’t open/close, motor issues (for venting types) | Faulty hardware, motor, control systems, wiring |
| Flashing or curb problems | Gaps, warping, corrosion around edges | Poor flashing detail, settling, movement, inadequate flashing during install |
Skylight companies in Toronto frequently attribute leaks to workmanship or flashing issues.
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Types & Mounting Styles: What Affects Repair Options
How your skylight is constructed has implications for repair:
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Deck-mounted skylights: These are mounted flush with the roof deck. They often involve glass panels.
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Curb-mounted skylights: These sit on a raised “box” (curb) built up from the roof surface. They’re often used in retrofits, and can be easier to replace without disturbing roof structure.
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Dome / acrylic skylights: Often double-domed plastic or acrylic units. They tend to allow more heat gain and have weaker sealing (harder to make perfectly watertight) compared to sealed glass units.
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Ventilated / operable skylights: Can open/close (manually, electrically, or solar). These have additional moving parts, seals, motors, sensors, etc. T
Because the design influences ease of access, seal complexity, and replacement parts, it directly affects repair cost and feasibility.
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Cost Estimates (Toronto / Canada Context)
Costs can vary widely depending on the damage, skylight type, access, and scope of work. Some rough ballpark figures:
| Repair / Replacement Task | Typical Range* |
|---|---|
| Minor leak / resealing / flashing repair | A few hundred dollars (e.g. $200–$700) |
| Glass / glazing replacement (while keeping frame) | $300 up to $1,500+ depending on size, glass type, difficulty |
| New skylight installation / replacement | $800 to $2,000+ per unit, depending on mounting, roof work, flashing etc. |
*These are estimates; the actual contractor quote may be higher depending on roof conditions, height, access difficulties, internal repairs (drywall, insulation), and permit work.
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Regulations, Permits & Building Code Considerations
In Toronto / Ontario, there are some regulatory and code issues to keep in mind:
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Building permits
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Significant structural changes, new roof penetrations, or enlarging an opening will often require a permit.
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If a skylight replacement is part of a larger roof replacement project, it may be covered under the roofing permit, but you should confirm with your local building department (City of Toronto).
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Energy efficiency / code compliance
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Skylights may need to meet certain energy performance standards (e.g. minimum R-values, U-values, low-E coatings, argon gas fill) under local building codes or energy regulations (Ontario’s “Ontario Building Code” or municipal requirements).
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If you replace a skylight, you may have to ensure the new unit complies with current standards (which may be stricter than when the original was installed).
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Flashing & drainage design
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Proper flashing detail is critical. Poor flashing is a common cause of leaks.
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Drainage paths, laps, membrane compatibility, and waterproofing integration with the roof are all key in compliance and long-term durability.
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Warranty & liability
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Check whether the contractor is licensed, insured, and whether they provide workmanship / labor warranties.
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Use products from reputable brands, especially in a climate with freeze-thaw cycles.
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Historical / heritage properties
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If your house is in a heritage zone or has heritage designation, there may be additional restrictions on altering roof lines, visible elements, or materials.
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Always check with local heritage / planning authorities.
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What to Ask / Check When Hiring a Skylight Repair Contractor
Before hiring a good Skylight Repair Professional in Toronto or Etobicoke, here are good checks/questions to run:
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Are they licensed, insured, and bonded?
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Are they familiar with local Toronto / GTA building codes and permit requirements?
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Do they specialize in skylights (vs general roofing)?
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What brands / products / materials will they use? (E.g. VELUX, other well-known skylight brands)
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Do they offer a warranty (labor and parts)?
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Can they diagnose first and provide a detailed quote?
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What’s the access plan / scaffolding / safety plan, especially for higher roofs?
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Will they handle internal repairs if the leak caused drywall, insulation, or ceiling damage?
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How will they flash and integrate the skylight with the existing roof membrane or shingles?
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Ask to see previous work / references.
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Confirm timeline, payment terms, and what happens if additional issues are found.
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Preventive Maintenance Tips
To help avoid future repairs, these steps are helpful:
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Inspect periodically (at least once or twice a year) — check seals, flashing, frame condition.
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Clean debris, leaves, moss, or gutters that might trap water.
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Ensure drainage around the skylight is clear.
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Re-seal or caulk at the first sign of seal failure.
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Monitor condensation, fogging, or small leaks — catch them early.
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During reroofing, consider replacing or upgrading the skylight to match the new roof system.