Basement Windows · Toronto & GTA

Basement Window Replacement in Toronto & the GTA

Drafty, foggy, or rotting basement windows? We manufacture and install ENERGY STAR® vinyl basement windows that stop drafts, moisture, and mold at the source, installed by our own licensed crews across Toronto and the GTA.

Updated July 2026Service & pricing pageToronto & GTA
Book a Free Assessment Call or Text (647) 800-6973
ENERGY STAR® Certified Manufacturer25-Year Transferable WarrantyManufactured in EtobicokeRebate Paperwork Handled

On This Page

$450–$800+ typical per window, like-for-like replacement
Hopper, slider & casement styles manufactured locally
ENERGY STAR® options that cut drafts and condensation
Egress upgrades available for legal basement bedrooms

Signs Your Basement Windows Need Replacing

Basement windows live in the harshest spot on your home: close to grade, splashed by rain and snowmelt, and often the last windows anyone upgrades. Replace them when you see:

  • Condensation or fog between panes: the seal has failed and the insulating gas is gone. Persistent moisture here feeds condensation and frost problems and, eventually, mold.
  • Rotting or rusted frames: original wood or steel basement frames from the 80s and 90s wick moisture straight into the sill.
  • Drafts and cold floors upstairs: single-pane basement windows are a major heat leak; basements account for a surprising share of whole-home heat loss.
  • Windows painted shut or that won't open: a safety and ventilation problem, especially for finished basements.
  • Water staining below the window: failed caulking or a poorly sloped sill letting runoff in.

Curious what new basement windows do for comfort, light, and resale value? See our guide to the benefits of basement windows.

Basement Window Styles We Manufacture

StyleBest for
Hopper (tilts in from the top)Small openings close to grade; maximum seal, easy cleaning. How hopper windows differ.
SliderWide, shallow openings; smooth operation with no clearance needed inside.
Casement (cranks fully open)Maximum ventilation and the style that most easily meets egress opening requirements.
Fixed / pictureLight only: utility areas where ventilation isn't needed.

Every unit is custom-made to your opening in our Etobicoke facility: vinyl frames, double or triple-pane glazing, and ENERGY STAR® options rated for Ontario's climate zone.

Basement Window Replacement Cost in Toronto

For a straightforward like-for-like swap (new window in the existing opening, no concrete work), basement windows are the most affordable windows in the house:

ScopeTypical range
Basement window, like-for-like replacement$450 – $800+ per window
Upgrades (triple pane, grids, custom colour)varies; quoted per window
Enlarging the opening / adding a window well (egress conversion)see egress window installation: $4,000–$10,000 all-in

Final pricing depends on size, glazing, and the condition of the opening. You'll get a fixed written quote after a free on-site assessment. Want a ballpark first? Try our window cost calculator.

Same-Size Replacement or Egress Upgrade?

This is the one decision to make before you order: if the basement room is (or will become) a bedroom or a legal second suite, Ontario Building Code requires an egress-sized window, and that usually means enlarging the opening, not just swapping the unit.

Rule of thumb: keeping the basement as rec room, laundry, office, or storage → a like-for-like replacement on this page is all you need. Adding a bedroom or rental suite → you need our egress window installation service, and it's worth reading the egress code guide first.

How Replacement Works

  1. Free on-site assessment. We measure each opening, check the frames and sills for rot or moisture damage, and give you a fixed written quote per window.
  2. Custom manufacturing. Your windows are built to the millimetre in our Etobicoke plant. No forcing stock sizes into old openings.
  3. Installation day. Old units out, new units set, shimmed, foamed, and sealed against moisture. Most like-for-like basement swaps are finished the same day.
  4. Cleanup & warranty. We haul away the old windows and back the work with our written workmanship warranty.

Basement Window Replacement Across the GTA

We replace basement windows in Toronto, Etobicoke, and across the GTA, including Mississauga, Brampton, Vaughan, Oakville, and Richmond Hill.

Basement Window Replacement FAQ

How much does basement window replacement cost in Toronto?
A like-for-like replacement (new window in the existing opening) typically runs $450–$800+ per window depending on size, style, and glazing. Enlarging the opening for an egress window is a different project, typically $4,000–$10,000 all-in including concrete cutting, the window well, and permits.
Do I need a permit to replace basement windows?
A same-size replacement in the existing opening generally doesn't require a building permit in most GTA municipalities. Enlarging the opening, cutting concrete, or converting to an egress window does, and for egress work we handle the permit and inspections for you.
Can basement windows be replaced in winter?
Yes. Like-for-like basement window swaps don't need excavation, so we install them year-round; each opening is exposed only briefly during the changeover.
What's the best style for a basement?
Hopper windows are the classic choice for small openings near grade; sliders suit wide, shallow openings; casements ventilate best and most easily meet egress sizing if you ever convert the room to a bedroom.
Will new basement windows fix condensation and mold?
Failed seals and single-pane glass are the usual culprits behind basement condensation, frost, and the mold that follows. Modern double- or triple-pane units with warm-edge spacers keep the interior glass surface warmer, which prevents most condensation when combined with proper sealing of the opening itself.
Do new basement windows need window wells?
Only where the opening sits below grade. If your existing window already has a well, we check its drainage during the assessment; a like-for-like swap normally reuses it. New or deeper wells are typically part of an egress conversion.

Related Reading

Egress Window Installation

Legal basement bedrooms: cutting, wells, permits, inspection.

Benefits of Basement Windows

Light, value, and ventilation: why they matter.

Window & Door Rebates in Ontario (2026)

What’s still open and how to qualify.

Standard Window Sizes in Canada

Typical dimensions for every style and room.

Free On-Site Assessment • Fixed Written Quote

Warm, Dry, Bright: Starting From the Basement

Custom-made basement windows from Toronto's local manufacturer, installed by our own crews and backed in writing.

Get Your Free Quote Try the Cost Calculator

Prefer to talk? Call or text (647) 800-6973