Ajax window & door installer
Windows, Doors and Eavestrough in Ajax
Ajax is twenty minutes east of our head office at 4725 Sheppard Ave E in Scarborough, straight down the 401. Fortress Windows & Doors has been installing replacement windows, entry doors, patio doors and eavestrough in Ajax homes since 1989: South Ajax and the wartime streets near the lake, Central Ajax, Pickering Village, Applecroft, Nottingham, Riverside, Duffins Bay and the newer streets north of Taunton. Family-owned, Ontario-built windows. Call (416) 291-5795.
Reviewed by Steve McCue and Steve Mercer, owners, Fortress Windows & Doors Inc.
Since 1989
Owner-run, family business
Canadian-made
Built for Ontario winters
Our own install crew
No subcontractors
Lifetime warranty
Covers product and labour
What we do
What Ajax homes usually need
The wartime houses south of Bayly
Ajax started as a munitions plant town in the 1940s, and the small storey-and-a-half houses near the lake are the original stock. Wood windows, sash weights, openings that were never square. These are full-frame replacements, and the basement windows usually get upgraded at the same time.
Central Ajax and the 1960s and 70s streets
Bungalows and side-splits with single-pane wood or aluminum behind a storm, and a big picture window at the front. Full-frame replacement with a structural check on the picture window header is the normal job here.
Applecroft, Nottingham and the 1990s and 2000s subdivisions
Builder-grade vinyl hitting the end of its sealed-unit life all at once: fogging, cranks that spin, sashes that will not lock. We see whole streets replacing in the same season.
Entry and patio doors
Insulated steel or fibreglass entry systems with the frame and threshold replaced, and vinyl sliding, garden or French patio doors for the backyard. South of the 401 the wind comes straight off Lake Ontario, so doors facing the water get multipoint locks and a proper sill pan.
Eavestrough and downspouts
Six-inch seamless aluminum, formed on site. Ajax sits on clay, and a downspout that dumps beside the foundation is where basement leaks start. We extend them to where the grading actually carries water away.
Why Fortress
Why Ajax homeowners call Fortress
We are close and we are real. Fortress has an office in Scarborough you can drive to, a second office in Barrie, and 37 years of installs. Ajax, Pickering and Whitby have been part of the route since the beginning, and the number on this page rings at the office, not a call centre. Before you call anyone, read our comparison of window replacement companies in Ajax.
Installing since 1989
Family-owned and still run by the family. Durham has been part of the route for 37 years.
Best of HomeStars 12 times, including 2026
Verified reviews from real installs. Read them before you book.
Canadian-made, CSA A440 certified, Energy Star
Built in Ontario, certified to CSA A440, Energy Star rated for Canada.
Financing available
Flexible financing on windows and doors so a whole-house job does not have to wait for one big cheque.
What is included
How an Ajax job runs
It starts with a measure at your house, not a quote over the phone. We check every opening, the sills and the wall around them, and give you one written price for the whole job. That price includes:
- Written quote with no hidden extras
- Removal and disposal of old windows and doors
- Low-expansion foam around every frame
- Colour-matched exterior aluminum capping
- Interior trim and caulking
- Same-day clean-up
- Warranty registered in your name
Our process
How the job runs
From first call to final walk-through.
Book a measure
Call (416) 291-5795 or use the quote form. Tell us which openings and roughly when.
In-home measure
We measure every opening, check for rot or water damage, and go through frame colour, grilles and glass options with you.
One written price
One number for the whole job. It only changes if you change the scope.
Build and install
Custom-built to your measurements, which takes a few weeks and longer in spring. Most Ajax homes are installed in one to two days.
Walk-through and warranty
We walk every unit with you, show you the hardware, and register the warranty.
The difference
What changes after the install
Lower heating bills
Going from single-pane or failed builder vinyl to low-E argon-filled glass shows on the Enbridge bill the first winter.
No more cold pocket by the window
That cold spot by the living room window is the frame leaking, not the glass. Foamed frames fix it.
Quieter rooms
Sealed double or triple glazing takes the edge off the 401, Bayly, Harwood and the GO line.
Rebates when they are open
Ontario and federal energy rebate programs change. We check what is open when you book and tell you what your job qualifies for.
Drier basement
Eavestrough pitched properly with downspouts extended away from the wall is the cheapest basement waterproofing in Ajax.
Resale
Home inspectors in Durham look at the windows first. New, warrantied units go in the listing; fogged glass comes up in the negotiation.
Service areas
Other areas we cover
Same crews, same warranty, across the GTA and Simcoe County.
FAQ
Frequently Asked Questions
Do I need a permit to replace windows in Ajax?
Not for a like-for-like replacement in the same opening. You need a Town of Ajax building permit if the opening is being enlarged or a new one cut, which covers most basement egress windows.
How long does window replacement take in Ajax?
A typical Ajax house with 10 to 15 windows is installed in one to two days once the windows arrive. Lead time from measure to install depends on the season; spring and early fall are the busiest.
Do you replace windows in the winter?
Yes. One opening at a time, so the house is never open for long, and the foam and caulking we use are rated for cold-weather application. Winter is often the fastest time to get on the schedule.
Can you replace the windows in a wartime house?
Yes, and we do a lot of them in South Ajax. The openings are small and rarely square, so each one is measured individually and the replacement is built to fit. Full-frame is the right approach; the original wood is usually past saving.
Do you do eavestrough on its own, without windows?
Yes. Eavestrough and downspout replacement is a standalone job. Six-inch seamless aluminum, formed on site, with downspouts routed away from the foundation.
Do you cover Pickering and Whitby too?
Yes. Both have their own pages on this site, and both are handled from the Scarborough office.
Where is Fortress located?
Our head office is at 4725 Sheppard Ave E, Unit 405, Scarborough, ON M1S 5B2, about twenty minutes from Ajax on the 401. Call (416) 291-5795. We also have a Barrie office at 15 Pepin Ct.
Need windows, doors or eavestrough replaced in Ajax?
One written price, measured by an owner. Call (416) 291-5795 or book online.