Buying a Home? Inspect Windows & Doors First

In Quebec's inspection préachat culture, buyers scrutinize foundations and roofs — yet windows and doors, which can easily represent a $15,000 to $40,000 replacement bill, often get a thirty-second glance. Here is the checklist we'd use ourselves: what to look for at every opening, which findings are cosmetic and which are budget red flags, and how to turn what you find into negotiating leverage before you sign.

Why windows and doors deserve a hard look before you offer

A full window and door replacement is one of the largest single renovation bills a Quebec homeowner faces — commonly $700 to $1,300 per installed window and $2,500 to $8,000 for a quality entry or patio door system. On a typical bungalow with twelve windows and three doors, worn-out fenestration is a five-figure line item hiding in plain sight. Unlike a dated kitchen, it isn't optional: failed windows leak heat, water and comfort every single day.

Quebec's pre-purchase inspection (inspection préachat) is a well-established step here, and a good inspector will note obvious window issues. But inspectors work fast, rarely operate every unit, and their reports often flag 'aging windows' in one generic line. The detailed walkthrough below is something you can do yourself at the second visit — before the inspection, and before you decide how much to offer.

The timing matters because of how offers work in Quebec: conditions and price adjustments are negotiated up front, and an inspection clause gives you a window to revisit the price with evidence in hand. Buyers who arrive at that conversation with a per-opening list and realistic replacement costs negotiate from a very different position than those waving a vague inspection report.

Fogged glass: reading failed seal units

Condensation or a milky haze between the panes of glass — not on the interior surface you can wipe — means the insulated glass unit's seal has failed and its insulating gas is gone. That window has lost a large share of its thermal performance and will only get worse; the fog often shows as a crescent along the bottom edge or mineral staining that no cleaning touches. Check in raking daylight and look at each unit from an angle, because early-stage failure is easy to miss head-on.

One fogged unit can sometimes be resolved by replacing just the sealed glass ($300 to $700 per unit), so a single failure isn't a dealbreaker. A pattern is different: seal failures cluster by age and by exposure, so if two south-facing windows have failed, their same-age neighbours are next in line. Count every affected unit and note its location — you'll want that list later.

Don't confuse seal failure with normal condensation. Moisture on the room-side glass in January usually points to household humidity, and dew on the exterior on a cool summer morning is actually a sign of well-insulating glass. Between the panes is the only place fog always means failure.

Frames, sills and rot: the press test

Bring a simple tool to the visit: your thumb, and ideally a blunt screwdriver used gently. Press the exterior sills, the bottom corners of wood frames, and the brickmould around each opening. Sound wood feels firm; rot feels spongy or lets the tool sink in. Pay special attention to the lowest windows, anything under a roof valley or missing gutter, and the sill under every patio door — these see the most water.

Peeling paint, dark staining below a window, rust streaks on fasteners and caulking that has cracked or pulled away are all signs water is getting where it shouldn't. On the interior, look for bubbled paint or soft drywall at the bottom corners of window returns, and lift a corner of carpet or check the flooring below patio doors for staining. Water damage around openings is rarely about the window alone — it often means flashing problems that reach into the wall.

On PVC and hybrid windows, rot isn't the issue, but check for warped sashes, chalky or cracked profiles on sun-exposed faces, and gaps at the welded corners. On aluminum, look for corrosion and failed thermal breaks (visible as heavy interior condensation on the frame itself in winter photos, if the seller has any).

• Press test: sills, bottom corners, brickmould — spongy means rot
• Stain trails: dark streaks under windows inside or out signal chronic water entry
• Caulking: cracked, hollowed or missing beads mean the envelope has been unprotected for years
• Below patio doors: check flooring and subfloor stiffness — the most expensive rot hides here

Open every window. Yes, every one

This is the step almost every buyer skips and it takes fifteen minutes: operate every window and every door in the house, fully. Crank each casement to its stop and back, slide every slider, lift every hung sash and see if it stays up, lock every lock. A window that needs force to open, closes with a gap at one corner, or won't lock isn't a lubrication problem — it usually signals a racked frame, worn hardware or a house that has moved.

Pay attention to what your hand feels. Grinding in a crank means the operator gear is dying ($80 to $250 per window to replace, if parts still exist). A sash that drops when unlocked means broken balances. A patio door you have to shoulder means worn rollers or a bent track. Individually these are small repairs; across a whole house they add up to real money and tell you how the property was maintained.

Doors deserve the same treatment: swing them fully, watch the reveal (the gap between door and frame) for consistency, and confirm the deadbolt throws smoothly without lifting the handle. A latch-side reveal that's wide at the top and tight at the bottom points to a sagging frame or foundation movement — which is bigger than a door problem.

Drafts, air leaks and what winter will feel like

You're probably visiting in mild weather, so hunt drafts indirectly. Look at the weatherstripping on every operable sash: flattened, torn or missing weatherstrip is an air leak in waiting. Check for daylight visible around door slabs, gaps where you can slide a sheet of paper between sash and frame with the window locked, and flexible caulking joints that have separated from the masonry.

If the house is cool inside on a warm day, the back of your hand near the perimeter of glass and frames will still find leaks. Some buyers bring an inexpensive infrared thermometer — a frame edge several degrees off from the wall beside it deserves a note. Also scan for dust trails on sills and carpets at specific spots: air leaks pull dust and leave a signature over time.

Ask the seller for heating bills — in Quebec, twelve months of Hydro-Québec history tells you a lot about the envelope. A 1980s house with original windows and an electricity bill well above similar homes in the neighbourhood is telling you where the money goes.

Age and energy labels: dating the windows

Windows carry more identification than most buyers realize. Look in the corner between the panes for an etched or printed spacer-bar stamp: many manufacturers print the fabrication date and company name right on the metal spacer. The hardware sometimes carries a maker's mark you can date, and permanent labels or stickers in the track of sliders and patio doors often show a serial number the manufacturer can look up.

Age drives your budget math. Quality PVC windows have a useful life around 25 to 35 years, aluminum somewhat less on the thermal side, and older wood units depend entirely on maintenance. If the spacer stamps say 1996, you're not buying windows with issues — you're buying a full replacement project, whatever the sellers' listing says about 'well-maintained original windows'.

Look also for ENERGY STAR labels or an energy rating (ER) sticker on newer units, and ask the seller for invoices: recent replacements should come with transferable warranty paperwork. A 'windows were redone' claim without documentation, brand or date is worth verifying — partial replacements (front facade only, for curb appeal) are extremely common.

Budget red flags: from cosmetic to five figures

Not every finding weighs the same, so sort your list into three buckets. Cosmetic and cheap: worn weatherstripping, tired caulking, sticky hardware, one or two fogged units. These total a few hundred to a couple of thousand dollars and are normal in any lived-in house — note them, but don't lose a good house over them.

Serious but scoped: multiple failed sealed units, rot in one or two sills, a patio door at end of life, aluminum sliders from the 1980s on the north face. Price these at real replacement cost — roughly $700 to $1,300 per installed window, $3,000 to $8,000 for patio and entry door systems — and bring the total to the negotiation.

Structural red flags: rot that extends past the frame into wall sheathing, staining that suggests long-term infiltration, openings visibly out of square across the house, or interior mould smell at window returns. These aren't window quotes anymore; they're open-wall repairs of unknown depth, and they justify a specialized inspection before you firm up — or a walk-away.

• Under $2,000: weatherstripping, caulking, hardware, an isolated fogged unit — normal wear
• $5,000–$25,000: clustered seal failures, end-of-life windows or doors — quantify and negotiate
• Unknown depth: wall rot, chronic infiltration, mould — bring in a specialist before waiving conditions

Turning findings into your offer

Documentation is your leverage. Photograph every problem opening, count the affected units, and get a real number rather than a guess: a written estimate from a manufacturer-installer turns 'the windows seem old' into 'openings 4, 7 and 9 need replacement, quoted at $4,850'. Sellers dismiss vague concerns; they respond to line items.

You have three levers in a Quebec transaction: a price reduction, a holdback or credit at notary, or asking the seller to complete the work before closing. We'd generally advise taking the money rather than the seller's repair — a seller ordering their own replacement windows optimizes for cheap and fast, and you inherit the result. A price adjustment lets you choose the product, the installer and the timing yourself.

If you're closing on a house that needs windows, plan the sequence: measure and order in the weeks after closing (manufacturing lead times run 4 to 8 weeks), and target installation before the cold. Browse the window styles and series to build a realistic budget, and a free in-home estimate — which you can book even before you take possession, with the seller's cooperation — gives you the hard number to negotiate with.

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