When homeowners replace windows in the Durham Region, they have unique concerns. Located in Ontario climate zone 6A, windows here face freezing temperatures as low as -22°C in January and humidity as high as 33°C in summer, with freeze-thaw cycles in between that slowly break down poorly specified windows and seals. Throw in the mix of housing styles found in both cities and towns, from housing in the 1980s/90s at the north end of Whitby, post-war bungalows on the waterfront, to newer construction by the sea around Seaton, and the window specifications vary markedly by type.
This guide will provide Whitby and Pickering homeowners with a clear, concise view of window replacement costs in Durham, the time it takes from initial call to final seal, and the types of windows that are best suited for this climate and housing market.
What Does Window Replacement Cost in Whitby and Pickering?
Most Durham homeowners spend $750 to $2,200 per window on a standard installed window replacement, in 2026, including the new window unit, removal and disposal of the old window, labour, and sealing.
Window replacement costs vary significantly and the spread is large due to a number of factors including the type of window, window opening, glass package required, and the condition of the existing window frame. The typical range for each window type is as follows:
A typical casement or double-hung vinyl window in a standard residential window opening with double-pane, Low-E argon glass falls in the middle of that spectrum – at about $850–$1,200 installed. Picture windows, bay windows or windows that need a triple pane upgrade come in at $1,400 to $2,200. For pre-1990 Durham homes that have non-standard opening size, custom sizing will contribute to the labor, in addition.
Most homeowners in Whitby and Pickering expect to pay $9,000 to $22,000 for a complete house replacement – usually 10-15 windows in a typical detached home in the Durham Region. Multi-window projects will command a higher price per unit from installers, and the price is one EnerGuide evaluation per project, not one per window, which is important for access to Ontario Rebates.
What your quote should always include:
- Existing windows can be removed and disposed of as well
- All labour and installation
- Interior and exterior trim and caulking
- Site cleanup
- Warranty documentation
If a quote includes any of the following as separate line items ( labour, disposal, trim), request an all in number before signing anything.
Durham Region Climate: Why Specification Matters More Than Price
Whitby and Pickering are near the Lake Ontario, which helps to moderate temperatures a bit more than the interior of Ontario, but also higher humidities throughout the year and increased lake-effect weather in the fall and winter. All of this results in the need to make window specification a true performance decision and not simply an aesthetic one.
Double-pane Low-E argon is the minimum for any Whitby or Pickering replacement under Ontario Building Code’s thermal performance requirements (R-3.5 minimum for climate zone 6A). This is a glass package that performs well in everyday applications and is eligible for the majority of Ontario energy efficiency rebates. It is the standard for most of the replacements in Durham Region.
Triple pane Low-E argon provides an additional glass and additional gas space. For a Durham homeowner, the impact is a noticeable improvement in the glass’s temperature on chilly mornings, lower cold radiant loss in adjacent rooms to windows, and appreciable improvement on north or lake facing orientations. A triple pane is the correct choice upgrade for Whitby and Pickering homes that have a large window on the west or south or have always been cold, no matter the thermostat setting. It is usually a 15-20% premium over the original price of the window, but this premium can be offset through Ontario government rebates when windows are qualified for the ENERGY STAR Most Efficient 2026 designation.
Vinyl frames are the correct material for most Durham Region frames. They do not warp, do not need any sealing or painting and have a lifespan of 30 – 40 years. Fiberglass frames have excellent dimensional stability, are beautifully finished, and are ideal for people who want the best long-term performance for a home, and are willing to spend more upfront. Aluminium frames are available, but need a good thermal break to work well in Ontario winter conditions – otherwise, aluminium will have a strong tendency to conduct cold into the frame and cause condensation on the interior.
Window Replacement Timeline for Whitby & Pickering Homeowners
Booking ahead and being aware of the timeline is helpful to avoid a lot of frustration. The realistic sequence for a Durham Region window replacement with Milano is as follows:
Free in-home consultation and measure: We visit your home in Whitby or Pickering, measure all openings, evaluate frame condition, discuss your glass and style preferences and give you a complete written quote. This takes 30-45 minutes.
Manufacturing: Windows are custom-manufactured to the exact dimensions of your openings, using Canadian-made products which are designed to accommodate Ontario’s climate. Standard Lead Time: 3-5 Weeks from Order Placed to Delivery.
Booking and scheduling: Spring and early summer (April-June) is the peak time for booking and scheduling throughout the GTA and Durham Region. Late summer to early fall usually provides the ideal opportunity for installation, and may also provide greater scheduling flexibility. At time of booking we advise each Durham homeowner a secure installation date.
Installation day: We don’t have subcontractors, only our trained crew who comes to your location at the scheduled time. The average time to replace a 10-12 window house is one day. Projects of 3-5 windows can be completed in a half day. Your floors and interior are protected during installation.
Permit note: Window replacement (like for like) in an existing window opening generally does not require a building permit in Whitby or Pickering. Permits for structural changes, enlarging an opening or creating a new opening are processed at Durham Region’s building department in 10-15 business days. Permit requirements verified during the consultation.
Ontario Rebates Available to Whitby & Pickering Homeowners
Like Toronto residents, Durham Region residents can access the same Ontario and federal energy efficiency programs and the application process is the same. This year, the major programs are the Ontario Home Renovation Savings Program and the Canada Greener Homes Grant, which have a combined value of up to $10,600 for eligible window and door upgrades.
The most important thing Durham homeowners neglect to do is to have a registered EnerGuide home energy evaluation done before starting any installation work. Retroactive application is not allowed. This evaluation is around $400-$600 and is necessary to qualify for the top levels of the rebate program. From beginning to end, Milano advises all eligible Durham homeowners through the rebate process – we confirm which windows are eligible, schedule appointments for the evaluation process, and make sure all paperwork is complete.
When you are replacing all windows in your home, the premiums from double panes to triple panes are often balanced out by federal and provincial rebates and the net cost is zero when that happens.
Why Durham Region Homeowners Choose Milano
In Durham Region and the Greater Toronto Area, Milano Windows & Doors has been in business since 1997, and has served Whitby, Pickering, Ajax, and the surrounding areas. That’s what it means in practice for a Durham homeowner:
- More than 15,000 installs were made around the GTA and Durham Region
- 9× HomeStars Best of Award winner (2017–2025)
- Hundreds of verified homeowners rated 5 stars on Google
- Lifetime warranty on all windows & installations
- No interest and no hidden fees with 0% financing available
- Where the installation qualifies for HST, the HST is paid
- Up to $10,600 in available Ontario government rebates
- Products that are 100% Canadian, designed to withstand the Ontario climate.
Frequently Asked Questions: Whitby & Pickering Window Replacement
How much does window replacement cost in Whitby and Pickering?
Most Whitby and Pickering homeowners spend $750 to $2,200 for each window they install in 2026, varying by window style, size, and glass package. The price range for a full-house replacement of an average Durham Region home is about $9,000 to $22,000, depending on the scope of the job, the labour required, the disposal service, trimming, and caulking. Milano provides written, all-in quotes with no obligation after a free in-home measurement.
Do I need a permit to replace windows in Whitby or Pickering?
In most cases, no. Window replacement in an existing window opening is a like-for-like replacement and does not require a permit in Whitby or Pickering. Durham Region’s building department issues permits in 10-15 business days when your project requires an enlargement or a new opening. During the free consultation, we determine if your project requires a specific permit.
What is the best window for Durham Region's climate?
Vinyl framed windows with two panes of Low-E argon glass are adequate for most Whitby and Pickering residences for performance reliability and compliant with the Canada Building Code. Triple pane with Low-E argon is the superior choice for north, lake or large west facing windows for the long haul. It helps keep a warm glass surface during the deep winter months and minimize the cold radiation that makes rooms uncomfortable on the coldest days of a Durham winter.
How long does window replacement take in Whitby?
The typical installation window is 4-6 weeks, with 3-5 weeks of custom manufacturing. Installing a whole house of 10-12 windows will require one full day, while for smaller projects, a half day will suffice. There are no building department delays for standard projects – just like-for-like replacement is not subject to permit approval.
Can I get rebates for window replacement in Pickering?
Yes. Homeowners in Durham Region can access all of Ontario’s and federal government’s energy efficiency programs, such as the Canada Greener Homes Grant and the Ontario Home Renovation Savings Program. The most critical step is to have an EnerGuide home energy evaluation completed prior to installation and for this reason, it cannot be retroactively completed. Milano takes every Pickering homeowner for a walk through the rebate process and makes sure no money is left on the table.
Does Milano replace windows in Whitby and Pickering?
Yes. Milano Windows & Doors is available for the entire Durham region as well as Toronto & GTA, Whitby, Pickering, Ajax, Oshawa, Courtice, Bowmanville, Brooklin and Port Perry. No subcontractors for any Durham installation, only our trained staff.
What window styles are available for Durham homes?
We fit all types of windows appropriate to the region’s housing stock, including awning, bay, bow, casement, double hung, picture, picture/window, specialty, slider, single hung and garden windows. All come in vinyl or fibreglass frames and have double or triple pane Low-E argon glazed packages. Style, colour of the frames and hardware are validated at your complimentary in-home consultation.
Ready to Replace Your Windows in Whitby or Pickering?
When your home in Durham has windows that leak in the winter, have difficulty opening and closing, or have fogging between the glass panes, or your heating costs aren’t as low as your thermostat setting, it’s time to replace your windows before the next winter season puts them to the test in Ontario.
Call 437-464-2753 for a complimentary in-home consultation or fill out an online quote form. We measure, quote and install with our own crew, lifetime warranty and 27 years of Ontario installations behind every project.