Serving Ajax, Pickering, Whitby & Durham Region Mon–Sat 8am–8pm WSIB Insured · Licensed Installers
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Trusted by 2,400+ Ontario homeowners since 2003

The window & door installers Ajax trusts most.

Ajax Windows & Doors has been part of this community since 2003. Proudly serving Ajax, Ontario homeowners with in-house crews, lifetime-warranted products, and a written fixed-price quote delivered within 24 hours.
  • Built and rated for Ontario winters
  • Lifetime warranty — glass, frame & labour
  • In-house crews — never subcontracted
  • Fixed price quoted before we start
4.9 / 5.0Google & HomeStars
2,400+Projects completed
22 yrsServing Ajax families

Get Your Free Quote

60-second form

    🔒 No spam, no pressure. We respond within 1 business hour.
    Glass, Frame & Labourcovered for life
    Climate Zone 2ENERGY STAR® certified
    No Down Payment0% interest, 60 months
    Every Crew Memberdirect employee, not sub
    BBB AccreditedA+ rated since 2009
    Window Installation Ajax
    Est.
    2003 · Ajax
    ABOUT AJAX WINDOWS & DOORS SPECIALISTS

    Local hands. Canadian-made. Built to last.

    Ajax Windows & Doors Specialists was built on a straightforward belief: that homeowners deserve honest pricing, skilled tradespeople, and products that actually hold up through an Ontario winter. What began as a small family operation has grown into Durham Region's most-referred installer — not through advertising, but through work that speaks for itself. Every measure, every frame, and every finished install is handled by our own people. Always has been. We work primarily with Ontario homeowners — from single-window repairs to whole-home retrofits — and selectively take on commercial projects where quality and timeline matter as much as price. What we don't do: commission salespeople, subcontracted installs, or invoices that don't match the quote. Seven out of ten of our jobs come from a neighbour's referral. That number tells you everything.
    480+
    Verified five-star reviews
    100%
    Canadian-made products
    7/10
    Jobs booked through referrals
    Our Services

    One team. Every window & door service.

    Whether you need a single pane swapped out or every entry point in your home upgraded, our crew handles the full scope — measured, built, and installed to last.

    Window Installation Ajax
    22yrs
    Ajax · Local
    2,400+
    Ajax homes upgraded since 2003
    WHY HOMEOWNERS CHOOSE US

    No shortcuts. No subs. No surprises.

    Twenty-two years of repeat business doesn't happen by accident. It happens because we treat every home like it's the one our name is attached to — because it is.

    • One warranty. Covers everything. Forever.

      Most installers split coverage between the manufacturer and the labour contractor — leaving you in the middle when something goes wrong. With us, one call handles everything, for as long as you own the property.

    • Up to 40% off your heating bills.

      Poorly sealed or single-glazed windows are one of the biggest sources of heat loss in an Ontario home. Our thermally broken frames and high-performance glass stop that drain before your next gas bill arrives.

    • In and out in a single day.

      Our crews arrive with every unit pre-measured, pre-ordered, and ready to fit. No waiting for parts to show up, no half-finished jobs left overnight — most homes are fully done, cleaned up, and back to normal the same day we start.

    • The quote you get is the bill you pay.

      We write every estimate as a fixed, detailed document — not a ballpark figure we adjust later. What changes between the quote and the invoice? Nothing. That's the point.

    Book Your Free In-Home Estimate
    NO OBLIGATION. NO PRESSURE.

    Your estimate is free. Your time is respected.

    Tell us what you're dealing with — one window, a full home, or anything in between — and we'll come to you, assess everything in person, and hand you a written price before we leave. No follow-up calls, no pressure to sign.Three ways to reach us — whichever feels easiest.

    THE PROCESS, START TO FINISH

    Four steps between you and a warmer home.

    Most Durham Region homeowners go from first enquiry to completed installation in under three weeks. Here's exactly what that journey looks like with our team.

    We come to you first

    A member of our team visits your home, measures every opening, and walks you through your options without rushing you toward a decision. You'll receive a clear written quote within 24 hours of the visit.

    TYPICALLY 45 MINUTES – NO PRESSURE
    01
    02

    You pick exactly what you want

    Choose your frame colour, glass package, hardware finish, and door slab from full-size samples we bring to your home. No guessing from a catalogue — you see and touch before deciding.

    HUNDREDS OF COMBINATIONS – MOCKUPS AVAILABLE

    Built to your exact measurements

    Every unit is custom-manufactured at our Canadian facility. Nothing is pulled off a shelf — your windows and doors are built specifically for your openings.

    100% CANADIAN-MADE – 3-5 WEEKS FROM APPROVAL
    03
    04

    Installation - Done in a day

    Our crew shows up on time, protects every surface, completes the full job, and removes all old units before leaving.

    FLOORS PROTECTED – FULL CLEANUP INCLUDED
    Window Installation In Ajax
    Up to 40% lower heating bills, year one
    WHAT’S ACTUALLY AT STAKE

    Ageing windows & doors cost more than you realise.

    Drafty frames, fogged glass, doors that don't close flush — these aren't just inconveniences. Every season you leave them unaddressed, your energy bills climb, your home becomes easier to compromise, and the repair bill grows quietly in the background. Most Durham Region homeowners only act when the problem becomes impossible to live with. By then, the damage is already done.
    • Heat escaping through worn seals — your furnace runs longer and your gas bill shows it every single month
    • Weakened entry points — aged door frames and tired hardware are the first thing an intruder looks for
    • Noise that shouldn't be inside — single or failed double-pane glass turns every passing car into a disturbance
    • A home that looks its age — deteriorating frames and foggy glass are among the first things a buyer notices at the curb
    THE INSTALLATION DIFFERENCE

    Who installs it matters as much as what you buy.

    There's a measurable difference between a unit that's been properly installed and one that hasn't — and you feel it every winter. Correctly fitted frames hold their shape, seals perform as rated, and the security hardware functions exactly as the manufacturer intended. Our crew is trained to that standard on every product we carry, on every job we take.
    • Longevity starts at fitting — a unit installed to the millimetre will outlast a rushed job by years, regardless of product quality
    • Thermal performance lives in the details — the right glass means nothing if air is bypassing the frame through a gap that no one sealed properly
    • Your door is only as secure as its frame — multi-point locks and reinforced slabs perform as designed only when the surrounding structure is fitted correctly
    • Poor installation voids your coverage — most manufacturers won't honour a warranty claim if the unit wasn't fitted to their specification by a qualified crew
    Best Door Installation Ajax
    $0 Down 0% APR · 60 months
    WHAT OUR CUSTOMERS SAY

    Straight from the streets we work on.

    We don't cherry-pick. Every review on Google, HomeStars, and TrustedPros is unedited and unprompted. Here's what a handful of Ajax homeowners had to say.
    ★ 4.9 · Google (312 reviews)
    ★ 4.9 · HomeStars Best of 2025
    A+ · BBB Accredited
    ★ 4.8 · TrustedPros
    AJAX & BEYOND

    Your neighbourhood is on our route.

    Being a local business means more than having a local phone number. We know these streets, these homes, and these winters — and that familiarity shows in how accurately we quote, how efficiently we work, and how rarely we need a second visit.

    Ajax + surrounding Durham Region

    We offer in-home quotes across all of the following:

    • Westney Heights
    • Nottingham
    • Pickering Village
    • Audley
    • Riverside
    • Lakeside
    • Central Ajax
    • Hermitage
    • South Ajax
    • Duffins Bay
    • Pickering
    • Whitby
    • Oshawa
    • Brooklin
    • Courtice
    • Bowmanville
    Ajax Showroom

    Windows & Doors Ajax 300 Rossland Rd E Ajax , ON L1Z 0K4

    FAQs

    Answers before you even pick up the phone.

    Don't see what you're looking for? A real person — not a chatbot — is available in three ways:

    What's the difference between double-pane and triple-pane glass in Ontario's climate?

    Double-pane glass offers a meaningful improvement over single-pane, but in a climate like Ajax's — where lakeside winters push temperatures well below freezing for months at a time — triple-pane is the more practical long-term choice. The additional glass layer and argon gas fill create a measurably higher thermal barrier, reducing heat loss through the glass itself. Most homeowners who upgrade from double to triple-pane notice the difference in their first heating season, both in comfort and on their energy bill.

    What window styles work best for older Ontario homes?

    Older Ontario homes — particularly those built before the 1990s — typically have non-standard opening sizes that require custom-measured units rather than off-the-shelf replacements. In terms of style, casement windows are the most common and practical choice for heritage and older builds: they seal tightly when closed, are easy to operate, and suit the proportions of traditional facades. That said, the right style always depends on the specific opening, the room's ventilation needs, and what fits the character of the home.

    Can you install windows and doors in winter?

    Yes — and in many cases, winter is actually a practical time to book. Our crews are experienced with cold-weather installations and use materials and techniques suited to low-temperature conditions. Openings are exposed briefly during the swap, but our process is designed to minimise that window. The bigger advantage: winter bookings often have shorter lead times, so if your current windows or doors are failing heading into the cold months, there's no reason to wait until spring to address it.

    How do I choose between steel and fiberglass entry doors?

    Both are strong, durable, and far superior to wood for Ontario's climate — but they suit different priorities. Steel doors are typically the more affordable option and offer excellent security and insulation when properly weatherstripped. Fiberglass doors cost more upfront but are more resistant to warping, denting, and corrosion over time, and can be finished to convincingly replicate wood grain. For homes close to water or exposed to significant weather, fiberglass tends to hold up better over the long term. We carry both and can walk you through the options in person.

    Will new windows and doors affect my home insurance?

    In many cases, yes — positively. Upgrading to impact-resistant, properly sealed windows and doors can reduce your home's risk profile in the eyes of your insurer, particularly around weather damage and forced entry. Some Ontario insurers offer premium reductions for ENERGY STAR® certified upgrades or reinforced entry door systems. We'd recommend contacting your provider after installation with the product specs and installation documentation — both of which we supply as standard with every completed job.

    How long do your installed windows and doors typically last?

    The products we install are designed and tested for a minimum of 25–30 years under normal Ontario conditions. In practice, a correctly installed, well-maintained window or door will often outlast that significantly. The variables that most affect lifespan are installation quality, exposure to direct weather, and how well the surrounding frame and caulking are maintained over time. Because we use our own trained crews on every job and back everything with a lifetime warranty, the performance of what we install is something we're accountable for well beyond the day we finish the job.

    How far in advance do I need to book an installation?

    It depends on the time of year and the scope of the job. During peak season — typically late spring through early autumn — lead times from approved quote to installation run between four and six weeks, accounting for custom manufacturing. Winter bookings often move faster. For urgent situations, such as a failed seal on an entry door or a damaged frame affecting security, we prioritise same-day or next-day assessments. The best way to get an accurate timeline is to reach out for a quote — we'll give you a realistic schedule from the first conversation.

    What should I do to prepare my home before your crew arrives?

    Very little — that's intentional. Clear the area within a metre or so of each window or door being replaced, move any furniture that sits directly beneath a window, and take down curtains or blinds from the units being worked on. Everything else is handled by our crew: floor protection goes down before we start, old units are removed and hauled away, and the work area is vacuumed and tidied before we leave. If you have pets, keeping them in a separate room during the installation makes the day smoother for everyone.

    TAKE THE FIRST STEP

    The hardest part is making the first call.

    We will visit your home, assess every opening, and follow up with a written fixed-price quote within 24 hours. No deposit required, no obligation to proceed, and no salesperson chasing you afterward.