North York has the widest span of construction dates of any Toronto borough, and that shows up directly in the skylights we are asked to replace. On a 1960s bungalow the unit is usually an acrylic dome on a site built timber curb. On a 1990s two storey it is often a first generation glass unit whose seal has failed. On a recently rebuilt house it may be a good quality unit that simply needs a new flashing kit because the roof has been redone around it. Skylight replacement North York work therefore starts with a diagnosis, not a price. This guide sets out the process, the realistic 2026 pricing, the timelines, and the one decision, curb mounted or deck mounted, that changes both.

When Skylight Replacement North York Homes Need Is The Right Call

Not every skylight problem is a replacement problem. These are the symptoms that genuinely indicate the unit itself has reached the end of its life.

• Haze trapped between the panes. A milky film that does not wipe off from either side means the insulated glass seal has failed and the fill gas has escaped. Sealed units cannot be resealed in place.
• A yellowed or crazed acrylic dome. Ultraviolet degradation and freeze thaw cycling render acrylic brittle within fifteen to twenty years here.
• Water that tracks with rainfall. Wetting that follows rain rather than cold snaps points to a real water path through failed flashing, a failed frame or a rotten curb.
• Corroded or split frame corners. Older aluminium frames corrode at the mitres and older timber frames rot from the inside out. Neither is repairable in place.
• An accumulation of old sealant. Layers of hardened caulk around a unit are a record of failed repairs. Once sealant is doing the waterproofing, the assembly is finished.
• Venting hardware that no longer seats. A venting unit that will not close fully is admitting water and heat continuously, and parts for older models are frequently unavailable.

By contrast, water that appears only on cold mornings and only at the ceiling edges is almost always condensation from an uninsulated or unsealed light shaft. That is a repair, done from inside, and it does not require touching the roof at all.

Curb Mounted Or Deck Mounted: The Decision That Sets The Price

This single choice accounts for most of the price spread between quotes, and it is worth understanding before you compare numbers.

A curb mounted unit sits on a raised timber curb, standing proud of the roof surface. It was the standard approach for decades and remains correct on low slope roofs, where lifting the unit above the water plane is genuinely necessary. Keeping the existing curb, repairing it where needed and fitting a new curb mounted unit onto it is the faster, cheaper path.

A deck mounted unit sits flush in the roof plane, its own integral frame and flashing kit forming the weatherproofing. It looks considerably better, sheds water more cleanly because nothing interrupts the flow, and eliminates the timber curb as a future rot point. It is the better long term choice on any roof of roughly 3:12 pitch or steeper, which covers the large majority of North York roofs.

Converting from curb mounted to deck mounted means removing the old curb, repairing the deck where it was fastened, and often adjusting the shaft head detail inside. That is real additional work, and a quote that offers the conversion should show it as a separate line rather than burying it.

The Full Replacement Process, Step By Step

A replacement is a defined sequence and any competent installer follows the same one. Knowing it helps you tell a thorough quote from a thin one.

• Assessment. The unit, the flashing, the curb and the interior are examined, and the attic is checked where accessible for existing moisture damage. Roof pitch is measured, because it determines which unit types are viable.
• Interior protection. Floors and contents are covered and a dust barrier is set before anything is disturbed.
• Shingle courses lifted. The shingles around the unit are cut back carefully so they can be reinstated cleanly afterwards.
• Old unit and flashing removed. All old flashing is stripped out rather than reused. Reusing flashing is the most common corner cut in this trade and it guarantees a repeat visit.
• Substrate inspected and repaired. With everything exposed, the curb and deck are assessed. Soft curb sections are rebuilt and rotten deck boards replaced.
• Membrane applied. Self adhered ice and water membrane goes around the opening, lapped correctly with the existing underlayment so water always runs over it and never behind.
• New unit set and flashed. The manufacturer’s matched kit is installed in the specified order: sill flashing, then step flashing woven course by course up both sides, then head flashing tucked under the shingles above.
• Shingles reinstated. Courses are cut in around the new unit so the roof reads as continuous.
• Interior finishing where needed. If the shaft head detail changed, or the shaft was never insulated and vapour sealed, that work is completed from below.
• Site cleared. Roof and grounds swept for nails and debris, and the roof left watertight at the end of every working day.

Our full local scope is set out on the North York skylight services page, and the technical detail on our skylight replacement service page.

2026 Pricing For North York Replacements

The figures below include the new unit, a matched flashing kit, labour, removal and disposal of the old unit, and shingle work around the opening.

North York’s steeper roofs, common on larger rebuilt homes, add rigging time and slow the crew down, which is what the steep roof surcharge reflects. It is not a premium for difficulty so much as a realistic accounting of a longer day worked safely.

Choosing The Replacement Unit And Glass

Because the roof has to be opened either way, a replacement is the least expensive opportunity you will ever have to change what kind of skylight you own. It is worth a few minutes of thought rather than simply matching what was there.

Fixed units have no operating hardware, cost the least and are the least likely to need service. They suit hallways, stairwells and living rooms where daylight rather than airflow is the objective. Manual venting units open with a crank or pole and work well where a ceiling is within reach, adding real stack ventilation on summer evenings. Solar powered venting units open by remote and close themselves on a rain sensor, need no wiring because an integrated panel charges an internal battery, and are the sensible specification for bathrooms and kitchens where humidity has to be removed as well as light admitted. Electric venting units are chosen where a unit sits in shade and a solar panel would underperform.

On glass, the default worth paying for in Toronto is a laminated inner pane with a low emissivity coating and argon fill. The laminated pane holds together if struck, which matters overhead and particularly under mature trees, and it damps the noise of heavy rain and hail. The low emissivity coating keeps interior heat from radiating away in January and reflects solar heat in July. The argon fill improves the insulating value of the sealed unit. Together they turn a skylight from a weak point in the envelope into a neutral one.

Blinds are worth ordering with the unit rather than adding later. On south and west facing North York roofs a factory fitted blind controls glare and late afternoon heat far more neatly than anything retrofitted, and solar operated versions can still be added afterwards without wiring if you decide you need one.

One more consideration applies on larger rebuilt homes with vaulted ceilings. Where there is no attic, the insulation and vapour control at the perimeter of the opening are the only barrier between warm interior air and the cold deck, so the replacement is the right moment to confirm that detail is sound rather than assuming it is.

Realistic Timelines From First Call To Finished Roof

The realistic total from first call to finished work in autumn is three to six weeks, and most of that is unit lead time and scheduling rather than site work. If you want the job done before sustained autumn rain, the assessment needs to happen in early September, not late October.

Comparing Quotes Without Getting Caught Out

Two replacement quotes for the same skylight can differ by more than a thousand dollars, and the difference is almost never the labour rate. Look for these six items in writing.

• The exact unit: manufacturer, model, size designation, glass package, fixed or venting.
• The flashing kit named, and whether the unit is curb mounted or deck mounted.
• Confirmation that all old flashing is being removed and replaced, not reused.
• Whether self adhered membrane is being applied around the opening, and how far it extends.
• Named contingencies for curb rebuild and deck repair, with unit prices rather than vague wording.
• Both warranties separately: the manufacturer’s product warranty and the installer’s own workmanship warranty in years.

A quote that lists a lump sum for “replace one skylight” cannot be compared fairly against anything, and it gives you nothing to hold anyone to if the work disappoints.

Why Autumn Is The Right Window In North York

September and early October give the conditions this work needs: temperatures where self adhered membranes and sealants bond as designed, days long enough to open a roof and close it again in one session, and dependable dry stretches. Completing before November means the new flashing is fully cured before sustained rain and the first freeze thaw cycles arrive to test it.

Waiting has an asymmetric cost. A skylight that leaks in February takes drywall and wet insulation with it, and winter conditions make the repair itself slower and more expensive. A planned replacement in dry autumn weather is the cheapest version of the same project.

Book Your Skylight Replacement North York Assessment

North York roofs vary enough that the right answer differs house to house, and the curb decision alone can move the price by more than a thousand dollars. Toronto Skylight Installers is based in the Toronto area and works throughout North York, measuring pitch and inspecting the curb and deck before putting a number on paper.

Call us today at (416) 365-7557 or request a free consultation to get a written quote you can actually compare.

Toronto Skylight Installers serves North York and the wider GTA, from Downsview and Willowdale through Don Mills, Bayview Village and the communities north of the city.