Window and Door Resealing Before Winter in Newmarket

Published 2026 — Rhodex

"Reseal the windows" means one job on a Glenway or Stonehaven-Summerhill vinyl window and a different job entirely on an original wood sash near downtown Newmarket. Both fail. Neither fix is the same, and quoting one when the house actually needs the other is how a homeowner ends up paying twice before the first frost.

Two window systems, not two versions of the same window

A lot of homes close to Main Street and the older side streets around it — Prospect, Srigley, Water, Church — still have their original wood double-hung sash windows, some dating back to the early 1900s. That's not a caulk-and-weatherstrip job the way a 1990s or 2000s Glenway or Stonehaven-Summerhill vinyl window is. A wood sash holds its individual panes with glazing putty, not a factory-sealed insulated glass unit, and older ones commonly still have the original sash cord and counterweight system that lets the window slide up and hold its position — a rope running over a pulley to a hidden weight inside the wall cavity, the same mechanism that's been standard in double-hung windows for over a century. A vinyl window has none of that. It's a sealed frame with weatherstripping around the sash and caulk around the perimeter where the frame meets the wall, full stop.

Treating an original wood sash like a vinyl window — running a bead of caulk around the outside and calling it done — misses the actual failure points, which sit inside the sash itself, not just around it.

What actually fails in an original wood sash

Two things degrade on their own timeline in a century-old sash:

Glazing putty — the hardened compound holding each individual pane in place. It dries out, cracks, and eventually lets water and air past the glass edge. This gets reglazed pane by pane, not caulked over.
Sash cords — cotton or nylon cord that stretches, frays, and eventually snaps after decades of daily use. A broken cord shows up as a window that won't stay open, or that's suddenly much heavier to lift. It's a separate repair from the seal itself, but it's common enough on a downtown-core home that a contractor doing a full resealing pass should check for it while the sash is already out of the frame.

Neither of these shows up on a Glenway or Stonehaven-Summerhill window, because neither of those homes has a sash built the same way.

What actually fails in a newer Glenway or Stonehaven-Summerhill window

A vinyl window from a 1990s or 2000s Newmarket subdivision fails at the exterior caulk joint and the weatherstripping gasket around the operable sash — the same two points that fail on any newer-build vinyl window anywhere in York Region. Caulk shrinks and pulls away from the vinyl frame over 15-25 years; weatherstripping compresses flat and stops sealing. That's a genuinely simpler job than reglazing an original wood sash, because there's no putty, no individual panes, and no counterweight system to check.

On the door side, both housing types see the same failure: compression or sweep-style weatherstripping wearing out, and — on an original wood door slab specifically — a door that's dropped slightly on aging hinges, which defeats new weatherstripping in a single season if the hinges and strike plate aren't adjusted first.

Real 2026 pricing

Reglazing an original wood sash window (putty renewal, multiple panes) — $70–$180 per window depending on pane count and how much old putty has to be cut out.
Sash cord replacement — $40–$90 per sash when it's caught during a resealing visit; more if the wall-cavity weight pocket has to be opened up.
Vinyl window reseal (caulk and weatherstripping, no glazing work) — $40–$90 per window, the more straightforward job.
Door resealing (weatherstripping, threshold and hinge adjustment) — $150–$350 per door, either housing type.
Full-house pass, older downtown-core home (roughly 10-14 original wood windows, 2 doors) — $700–$1,600, on the higher end because reglazing runs more per window than caulking.
Full-house pass, Glenway or Stonehaven-Summerhill vinyl-window home (roughly 18-22 windows, 2-3 doors) — $500–$1,100, more windows but each one is faster work.

Labour in York Region for this kind of work generally runs $70–$110 an hour; the gap between the two full-house numbers is almost entirely the extra time reglazing takes compared with caulking a vinyl frame, not a different hourly rate.

Storm windows: often already there, worth checking if not

Many original wood-sash homes near downtown Newmarket picked up exterior aluminum combination storm windows at some point in the past 40-60 years — a common Ontario retrofit that adds a second glazed layer outside the original sash. If your home has them, check their own seal and hardware during a resealing visit; a storm window with a torn sweep or a gap around its own frame undoes a chunk of the benefit of resealing the sash behind it. If your home doesn't have them and the original sash is otherwise sound, adding storm windows is a real alternative worth pricing against full window replacement — it preserves the original sash rather than pulling it out, and it meaningfully cuts drafts on its own.

Permits and heritage sign-off

Reglazing, recaulking, and reweatherstripping an existing window or door — no change to size, material, or appearance — is maintenance, not an alteration, and doesn't trigger a Town of Newmarket building permit. That holds inside the Main Street Heritage Conservation District too: our companion piece on storefront window repair in the heritage district covers the actual repair-vs-swap line the Town draws, and it applies the same way to a residential sash as it does to a commercial storefront. Where it changes is full window or door replacement on a designated heritage property, which does need heritage-committee review first — a different job than resealing, and worth a call to Newmarket Planning and Building Services (905-953-5300) before booking it, not before booking a reseal.

Timing it right

Exterior caulk and glazing putty both need a dry surface and a temperature generally above 5°C to cure and skin over properly. In York Region that puts the real window for this work at September through mid-November — late enough that summer heat isn't still expanding everything, early enough to beat the first hard frost. Booking a downtown-core reglazing job in October rather than waiting until a December cold snap forces the issue is the difference between a seal that cures right and one that doesn't.

Match the fix to the window you actually have

A Glenway or Stonehaven-Summerhill vinyl window and an original downtown-core wood sash both need attention before winter, but a contractor who quotes the same caulk-and-weatherstrip job for both hasn't looked closely enough at either one. Ask directly whether the work is caulking, reglazing, or a sash-cord check — the three cost differently, and only one of them applies to a factory-sealed vinyl frame.

Not sure what's actually going on?

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