Serving: St. Thomas, Elgin, London & Middlesex

Replacement Windows,
  Exterior Doors & Roofing
     in St. Thomas, London,
       Elgin & Middlesex

Windows · Doors · Roofing · Siding · Fences · Decks

Looking for professional window and door installation in St. Thomas, London, and Elgin County?

PerfectFit Installations is your trusted, locally owned exterior specialist. Every project is completed by our Window Wise Certified installers, guaranteeing the highest industry standards for energy efficiency and structural performance. We are proud authorized installers of premium Canadian-made brands, including North Star Windows, Dorplex Doors, and Vinylbilt Windows. From custom front entry systems to energy-saving replacement windows, we deliver a perfect fit every time.

Contact us at 226-448-1547 for your professional consultation.

Replacement Windows

Exterior Doors

Roofing
Metal & Shingle

Siding Installation

Decks & Fences

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Quality Craftsmanship

Energy-Efficient Products

Locally Owned & Operated

PerfectFit Installations is a trusted exterior renovation company, located in Aylmer Ontario, proudly serving homeowners in Aylmer, London, St. Thomas, and throughout Elgin County and Southwestern Ontario. With more than 20 years of hands-on industry experience, our company has built a strong reputation for delivering high-quality workmanship, reliable service, and exterior improvements that homeowners can depend on for years to come.

Originally known for professional window and exterior door installations, PerfectFit Installations has grown into a full-service exterior renovation specialist. Today, the team provides expert roofing installation, siding installation, soffit and fascia replacement, as well as custom decks and fences designed to enhance both the beauty and durability of your home. We also transform garages, by insulating and finishing to create incredibly functional spaces.

What sets PerfectFit Installations apart is our commitment to doing the job right the first time. Every project begins with a personalized consultation where homeowners receive honest advice, detailed measurements, and professional recommendations tailored to their home, style, and budget. Their Window Wise Certified installers ensure that each installation meets strict industry standards for performance, energy efficiency, and long-term reliability.

Living in Southwestern Ontario means homes must withstand harsh winters, strong winds, and changing seasons. PerfectFit Installations selects quality materials and proven installation methods that protect homes from the elements while improving curb appeal and property value.

When you choose PerfectFit Installations, you are choosing a local team that takes pride in craftsmanship, professionalism, and customer satisfaction. From small exterior upgrades to complete exterior renovations, PerfectFit Installations works hard to ensure your home looks better, performs better, and truly becomes the perfect fit for your family. We make it fit your lifestyle.

Excellent rating
Based on 17 reviews

Extremely happy with my new windows and how quickly they were done. Great job, great price.

Lisa Plant

Recently PerfectFit Installation replaced four basement windows. The job was professionally done, on time and on budget. Professional, knowledgeable staff that know far more than windows and made recommendations of other important work that needed to be done to keep my home secure from the elements. Thank you for the outstanding service!

Kim Pritchard

We recently had some windows replaced and had fascia and soffit work done, and I couldn’t be happier with the results. The quality of the work was excellent and the attention to detail really stood out. You can tell they take pride in doing the job right. On top of that, they were great to deal with — friendly, professional, and easy to communicate with throughout the whole process. I wouldn’t hesitate to recommend them to anyone looking for window or exterior work.

Adam Beverley

Very professional and great experience! Quick and amazing service ! Mike is the best 👍

Fawzi Koudsi

Perfect fit did a couple windows and a patio door on separate occasions and when they're done everything is perfectly put back and cleaned up. Excellent job on the trim work. A company that definately cares about your space.

Esther Klassen

The guys at PerfectFit did a great job with our windows and doors, including replacing all the capping which made the house look new again!🙌. I would definitely recommend them!

Cathy Harder

Hiring perfect fit was a great choice for our family, got all our windows and really nice doors done and we're really happy with cost and results. Highly recommend

Nicole Hernandez

Definitely gonna use these guys again! Experienced, professional and quality workmanship.

Abe Harder

We recently had all of the main floor windows and patio door installed by perfectfit and they look and operate perfectly. The installers were professional, organized and courteous. The inside and outside of the house were just as clean as before the work was started. I would recommend perfectfit to anyone who needs their windows or doors replaced.

Rick Fehr

Contact Us for a FREE Estimate!

226-448-1547

Serving: Aylmer, St. Thomas, London, Port Stanley, Tillsonburg, Belmont, Dorchester, Port Bruce, Elgin County, Middlesex, and Surrounding Areas

Proud Member: St. Thomas Chamber of Commerce, Google Business