Centennial Windows & Doors
“Had 6 windows and a front door done June 18, Had a great experience with sales rep Frank Harttrup.”
Best Window Installers in London, ON
21 companies listed · all 21 in London · 4 open weekends · 15 rated 4.5+
Data verified October 18, 2026
Heritage Renovations
“We couldn't be more grateful for the professionalism, communication and punctuality of our installation appointment.”
Riverbend Windows & Doors Inc.
“Our only regret is we didn't replace the front door at the same time, because everything looks so beautiful and fresh!”
Forest City Window & Door Ltd
“The two guys that came to do the installation were professional, polite and did an INCREDABLE job.”
1st Choice Home Solutions
“From our first interaction (which was online), to the roofers that were respectful of our property and our neighbours, to the constant follow up to ensure things were going smoothly and to our satisfaction.”
Douglas Window & Door Inc.
“The communication from Douglas Window & Door is ongoing so we were always aware of the next step.”
Listed for homeowners in and around London, ON, these 21 companies fit and repair windows. Frame materials, glazing options and any credentials shown are taken from company websites; the customer lines are quoted from public reviews.
Area overview: London, ON
All 21 companies we list here are in London itself. We have 27 companies in London on file; this page shows the highest-rated 21. The companies on this page are rated from 4.0 to 5.0 across 2,548 reviews; 10 have 50 or more reviews and 15 are rated 4.5 or higher. When customers rate these companies on specific qualities, they most often praise professionalism (95%), quality (86%) and punctuality (73%). The topics that come up most in reviews of the companies on this page are "estimates", "price" and "cleanliness". 4 are open on Saturdays and 1 on Sundays. Domain records put 12 websites of the companies on this page at ten or more years old; the oldest dates from 1997. 1 offers emergency call-outs; 3 offer financing or payment plans; 6 give free estimates; 7 are family- or locally-owned and 4 list coupons or special offers. We have a website on file for 20 of the companies on this page; 16 publish a contact page; 14 list a public email and 2 take bookings online. We count these figures across the companies on this page; hours and prices change, so confirm the details with the company before you book.
Is the home visit and measurement free?
A no-cost quote is offered by 6 of the 21 companies on this page. It comes with a sales visit, so agree how long it will take before they arrive. Ask for the quote in writing on the day, itemized by window, and be wary of a discount that disappears the moment the visit ends.
Four Seasons Sunrooms
“Four Seasons Sunrooms (London) dedicated professionalism, advice and communication provided us with the best experience to complete our Addition/Sunroom project.”
Blake Exteriors Window and Door
“I am very happy with the work and l will definitely be using this company again”
C.a.p.o.r. Renovations Inc.
“Even though it was later than the scheduled time, they were meticulous in their work,and I am satisfied.”
Aluminum Associates
“I really appreciate the effort and time they take to make sure your satisfied and the products are in excellent working order.”
Banman Windows & Doors
“His team replaced two huge bay windows, three large room windows and two doors in one day.”
Southwest Doors & Hardware
“I just want to send a thank you to the amazing service we received by Southwest, I called yesterday late afternoon and they were here a my store today to fix our issue!”
Beaumart Aluminum Ltd
“We had a small job that needed attention and Ken and his team gave us their expertise and their time to help us out.”
Jomar Window & Doors
“Jomar is one of very few companies that rebuild your window frame before installing the new windows, I happened to know even the big expensive companies do not do this.”
Raven Windows Inc.
“The service and quality are also top-notch and the company was always available throughout the process to address any questions we had during the construction process”
Thames Glass Limited
“Excellent pricing given the calibre of service and super quick efficiency which exceeds my expectations every time.”
The Window & Door Centre Inc.
“Debbie and her team were awesome to work with and Greg was fantastic with removing and reinstalling our window.”
W D Dave Smith Renovations
“Great service have used their services before”
McCallum Aluminum Ltd
“Responded quickly to all questions I had and accommodating to a few changes we made along the way.”
GP Home Solution Inc.
“We couldn't be more thrilled with the quality and workmanship of our new door.”
Hopkins Aluminum
“Excellent service and quality of work.”
Why these companies made our list
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