Broken front bay window glass on a Whitby home before replacement

Signs the window needs service

  • Water entry, drafts or movement at corner joints and projection-window transitions.
  • Aging roof caps, seat boards or multi-panel assemblies that no longer seal cleanly.
  • Glass, frame or support issues affecting the comfort and appearance of bay or bow windows.
New front bay window glass installed in Whitby with the existing frame kept in place

What we check and repair

  • Inspection of corner seals, support condition, roof-cap transitions and multi-panel glazing performance.
  • Recommendations focused on bay and bow window repairs, sealing improvements or section-by-section replacement scope.
  • Checks for weather resistance, fit and curb-facing appearance after service.

Repair or component replacement is likely when

Section-by-section repair is appropriate when the projection frame and support remain sound and localized seals, hardware or glazing can be restored.

Full-window replacement may be better when

Full replacement is considered when support, frame or several connected sections have failed and a localized repair will not provide a durable result.

Parts, compatibility and property details
Parts and systems
Projection window frame · Corner / mull joints · Roof cap · Seat board · Operable sashes and hardware · Glass / IGU sections
Standards and requirements
Applicable Ontario Building Code requirements · Applicable safety-glazing requirements where relevant · Manufacturer installation requirements for compatible window and hardware systems

Window assessment workflow

  1. 01

    Review photos and service details.

  2. 02

    Confirm the right scope and service timing.

  3. 03

    Complete the repair, replacement or make-safe work.

  4. 04

    Test the opening and share next-step recommendations.

Completed projects for this service

1 project

View all project categories

Questions about Bay & Bow Window Repair, Replacement & Installation

Why is my bay window leaking or drafty at the corners?

Bay and bow windows have corner joints, seat boards and roof caps that move and open up over time. We reseal the joints, repair flashing transitions and renew perimeter caulking so water and drafts stay out.

Can you replace one section of a bay or bow window?

Often yes. If one sash or sealed unit has failed, we can replace that section while keeping the rest of the assembly, provided the structure and frames are sound.

How much does bay window repair cost in Toronto?

It depends on whether the issue is sealing, a failed glass unit or structural movement at the projection. We inspect the assembly, explain what is actually failing and quote the repair before any work begins.

Do you repair the roof cap over bay windows?

We inspect the joints where the projection meets the roof cap and wall, then identify whether seals, flashing or the window frame need work. We explain the repair and any roof or wall work required before quoting.

Toronto & GTA service coverage

Old Toronto bay frontsEast York family homesMarkham detached houses TorontoMarkham

Send photos of the window, not just the broken part

Send photos and a short note. We will review the issue and recommend the next step.

DoorWin Google Reviews

Martin 4 reviews • 1 photo
★★★★★

Great price

I had a foggy window and was looking for some one to replace it for a fair price , their team showed up the same day for an estimate and got a fair price compare to other “big” companies, they did an amazing job got a new glass installed within a week , really recommend ! :)

Repair wait time
0–1 hr

Curtis Savage 8 reviews
★★★★★

I hired DoorWin services to replace two cracked glass windows for a unit at my triplex. An exterior porch window and interior stairwell window I just needed the panes of glass replaced and not the entire frame . DoorWin was happy to do the job. Unlike some other companies who wanted to replace the entire frame at a higher cost. They were very quick with a quote and were able to perform the job on an extremely tight timeline that I had to unexpectedly move up. Very professional. Friendly. Dependable. Competitive prices. Took away all materials and left a clean worksite. Would highly recommend and will work with them again if I need another window repair.

Ike Kvapil 6 reviews • 4 photos
★★★★★

Max at DoorWin completed a professionally executed job on our front door while being a pleasure to deal with...would recommend him for any services their company provides.

J1330i 2 reviews
★★★★★

Guys, thank you again for the excellent services!! Extremely fast and professional at a fair price...thanks again!!!

Nicole Seahra Local Guide • 62 reviews • 19 photos
★★★★★

Doorwin Services alongside Alex were amazing. Came in same day. Went above and beyond. Thanks so much!

Anastasiia Dashkevych 7 reviews
★★★★★

Great experience with the window replacement. The team was professional, efficient, and the quality of work exceeded expectations. Everything was completed on time and looks amazing. Highly recommend!!!!!wont be disappointed:)

Amir Malek 5 reviews
★★★★★

Had an amazing experience with Doorwin Services for my metal door installation. The quality of work, attention to detail, and professionalism were top notch from start to finish. Big thanks to Maksim for all his hard work and help throughout the process — everything was installed perfectly and the final result looks great. Highly recommend Doorwin Services if you want quality work done right.

yarin danan 9 reviews • 4 photos
★★★★★

Excellent service. I needed help with a broken window. They did everything quickly and efficiently. I recommend them

Oleksandr Branytskyi 4 reviews • 2 photos
★★★★★

Excellent service from start to finish. The work was completed professionally, quickly, and with great attention to detail. The technician gave us several options on how to strengthen and improve the glass unit, and we chose the best solution. Everything looks great now. Highly recommend!

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