Roof and Window Lifespan in Quebec

Two 1998 houses on the same Laval street. One has a roof redone in 2019 and windows replaced in 2015, the other still has its original shingles. The listing does not tell them apart, the insurer does. Here are the service lives published by official sources, and how a buyer turns them into dated years rather than worry.

Expected service life: a Canadian average, not a guarantee

The most recent data published in French comes from CMHC’s Housing Design Catalogue. Its materials guide, dated August 2025, assigns each envelope material an expected service life in years, which “reflects the normal service life under normal conditions of use and maintenance”.

Two caveats, which the guide states itself. The figures are averages from suppliers across Canada. And expected service life “also depends heavily on factors such as exposure conditions and the maintenance performed over the product’s useful life”, so much so that “it can therefore vary considerably”. Those years are a theoretical ceiling. On a specific house, what decides is the year of installation and the condition observed.

Roof lifespan in Quebec: shingle, membrane, metal

Source: CMHC, materials guide of the Housing Design Catalogue.

The flat roof is not the poor relation. A four ply built-up roof is given 20 years, like the shingle, but two ply modified bitumen, the family the elastomeric membrane belongs to, climbs to 30 years. On a Montreal plex, the question is therefore not “flat or sloped”, it is “which membrane, laid when”.

Changing material also changes the process. In Laval, replacing the roof covering with the same material, with added insulation, requires no permit. Replacing it with a new material does: $92 for the first $20,000, plus $2.50 per bracket or part of a bracket of $1,000, with an announced timeline of 30 days. Going from shingle to metal is not only a pricing decision.

Windows, doors and caulking: the shortest line

The same guide gives 20 years to an insulated vinyl frame window, and 30 years to wood, aluminum clad wood, wood plastic composite, insulated fibreglass and anodized aluminum frames. Those durations cover the complete window: frame, glazing, hardware, sealing materials and joints. Exterior doors are given 40 years.

A vinyl window installed in 2006 is therefore at the end of its life on paper. It does not have to go tomorrow, but nobody should present it as new.

Caulking gets checked every year. In its water damage prevention advice, the Insurance Bureau of Canada is direct about door and window caulking: “Check its condition once a year.” It is the thinnest piece of the envelope and the first one water attacks.

In Laval, replacing doors and windows at the same dimensions requires no permit. Changing their dimensions, adding some, or replacing those located less than 1.5 m from the lot line: a permit is required in all three cases.

Freeze and thaw: the real factor nobody quantifies

Let us be clear. No official source consulted publishes a service life specific to Quebec, nor a percentage to subtract from the Canadian averages for freeze and thaw. That figure circulates widely, it comes from nowhere verifiable.

What is documented is the mechanism. The City of Montreal explains how potholes form “following an alternation between periods of freezing and thawing, during the winter and in early spring”: during a thaw, water seeps under the pavement, a freeze occurs, “the water turns to ice and lifts it”, then the next thaw leaves a void that collapses. The City repairs between 120,000 and 200,000 potholes every year, on the arterial network alone.

It is the same water and the same cycle working on your brick joints, your flashings and your caulking. Transposing a pavement figure onto a shingle would be an invention. The only defensible way to factor in the climate remains the one CMHC points to: have the condition observed rather than relying on the year.

Heat pump and water heater: two dates readable on a plate

Natural Resources Canada is precise: “The useful life of air source heat pumps ranges from 15 to 20 years.” For the hot water tank, the Insurance Bureau of Canada puts the benchmark in its prevention list: “Water heater: consider replacing it after 10 years, otherwise inspect it regularly.”

These two items have a rare advantage: their year of manufacture is written on the nameplate, in the basement, free of charge, during the showing. Photograph both plates. What a buyer prepares before filing a promise is in the buyer’s guide.

On the permit side, Laval requires no permit to install a heat pump, nor to replace an existing French drain. Adding one does require a permit.

Remaining useful life: the only estimate the law requires in writing

There is one place in Quebec where service life is not a conversation: divided co-ownership. The Regulation establishing various rules regarding divided co-ownership, enacted by order in council 991-2025, was published in the Gazette officielle du Quebec of July 30, 2025 and comes into force on the fifteenth day following.

Its section 3 is the provision to know. The maintenance logbook must contain, “in a section devoted exclusively to that purpose, an estimate of the condition and the remaining useful life of the materials, apparatus and equipment” described in the logbook. On that basis, it must describe the major repairs and replacements to be carried out “over at least the next 25 years”, and “an estimated year of completion must be indicated” for each.

Section 2 imposes the inventory: the installation date where known, the required maintenance work and its frequency, the warranty contracts, the inspection reports, the manufacturer’s manuals. Section 6 requires the person who prepares the logbook to attest that the common portions were “examined on site” by that person or under their supervision. The contingency fund study must be obtained at least every 5 years (section 8).

No regulation imposes any of this on the owner of a single-family home. The model is public: nothing stops you from copying it line by line. For a condo buyer, it is the opposite: the document exists, demand it. The obligations that flow from it are detailed in what Bill 16 requires of the syndicate.

What a component’s age changes at the insurer

The scenario is written in black and white. In its guide on water damage, the Insurance Bureau of Canada gives this example: “Your roof has reached the end of its useful life and you delay replacing it. The result is water infiltration that causes dampness and mould on the ceiling and interior walls of the home.” The verdict entered in the table: not covered. The category involved is “damage caused by humidity, condensation, rot, mould and gradual deterioration”, and the same guide recalls that “gradual and repeated water damage is never covered”.

Even a covered claim does not buy a new roof. The same organization writes that the insurer must restore property to its previous condition: “if wind damaged your roof, your insurer must have the damaged portion repaired, not redo it entirely”. And a policy without replacement cost coverage pays according to the value on the day of the loss, “that is, taking their wear and depreciation into account”. Which of the two bases applies to your building? Only your damage insurance representative can confirm it.

What gets declared at renewal. The guide asks the questions for you: have you had the roof redone, converted the heating system, changed the plumbing, replaced the doors and windows? A new roof you do not declare does you no good. The other factors that make an insurer hesitate are in what makes a home hard to insure.

What I do before proposing a price: I note the year of each item, not its appearance. What the inspector looks at is detailed in the pre-purchase inspection checklist, and what the seller has to write down, in the seller’s declaration form. The rest comes down to a subtraction: expected service life minus current age, item by item. That is what the law asks a syndicate to do over 25 years.

Frequently asked questions

My roof is 22 years old and it does not leak. Do I have to replace it right away? The decision is made on an observation, not on the calendar. The official benchmark is twofold: CMHC gives asphalt shingles 20 years of expected service life, and the Insurance Bureau of Canada recommends having a roof over 20 years old inspected by a professional. What is not negotiable is what follows: if the covering has reached the end of its useful life and you delay, the resulting infiltration and mould are classified as not covered.

Does a metal roof really last three times as long? According to CMHC’s guide, a prefinished standing seam panel is given 60 years and corrugated steel sheet 40 years, against 20 years for the asphalt shingle. These are Canadian averages, and the guide warns that exposure and maintenance make those durations vary considerably.

The seller says the windows were changed “around 2010”. How do I verify that? Through the dated invoice, and through nothing else. Without a document on file, treat the component as undated and ask for the paper in writing. An approximate year serves you neither with the insurer nor in a negotiation.

In a co-ownership, who has to give me the remaining useful life estimate? The syndicate, through its maintenance logbook. Since the 2025 regulation, the logbook must contain that estimate and the replacements planned over at least 25 years, with an estimated year for each, and the contingency fund study must rely on it and be obtained at least every 5 years.

To go further, read home maintenance costs in Quebec and what makes a home hard to insure.

Torn between two houses of the same age? Write to me: we compare the installation years before comparing the asking prices.

Georges Matar

Residential Real Estate Broker · RE/MAX DU CARTIER INC.

Contact Georges