20 Best Window Companies in Ontario, CA (2024 Reviews)
If you’re thinking about getting new windows, our guide to the best window installation companies can help.
We analyzed all the top-rated window companies in Ontario and selected the best 20 based on:
Customer reviews
Window installation expertise
Popularity with home-owners like you
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Why you can trust EcoWatch
The EcoWatch team is all about finding solutions for eco-conscious homeowners in Ontario. If your windows are made of traditional materials, or are outdated or damaged, you could be sending 25-30% of your house’s heat or cool air right out of them.
Replacement windows improve your home’s insulation, not only making you more comfortable during extreme temperatures, but also saving you some money and helping the environment.
We’ve compiled a list of the best installation companies to help you in your research, so you can not only take advantage of brand-new windows, but also save money on your energy bills.
Best Availability
Renewal by Andersen
- Great industry reputation
- Member of US Green Building Council
- Manufactures products in-house
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
Best Window Installation & Replacement Companies in Ontario
The EcoWatch team researched dozens of providers that serve the Ontario area to find the top window installation companies by our standards. The providers mentioned in this article scored best in our review categories, which include energy-efficient offerings, local expertise, price, availability, customer service and more.

Window World
EnergyStar Partner
Large serice area
Low prices relative to competitors
Great industry reputation
Lifetime warranty
Quality of service will depend on your area
Window World has windows expertise in Ontario. It's the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has been in the window installation industry for around 27 years.
If you’re looking for a company that is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital, Window World may be the company for you.
Energy Efficiency of Window World WindowsIts high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home. Not all of Window World’s windows are Energy Star certified, so be sure to mention that you want Energy Star windows when inquiring.
How much does Window World cost in Ontario?Window World does not list prices on its website, but it's known for offering some of the most affordable window installations around. You can ask for a free quote on its website for more information about pricing.

Milgard Windows & Doors
EnergyStar Partner
Wide network of installers
Lifetime warranty available
Entails hiring third-party contractors
Limited additional services
Milgard Windows & Doors has the best local installation in Ontario. It's a family-owned and -operated window replacement company, which primarily serves the West Coast. Milgard has been in the window installation industry for around 60 years.
If you’re looking for a company that offers competitive pricing, a comprehensive warranty and installers that all have a minimum of 15 years of window installation experience, Milgard may be the company for you.
Energy Efficiency of Milgard Windows & Doors WindowsThe company manufactures its own products, which gives it the freedom to make custom windows based on the climate. The company designs its own vinyl compounds and profiles to ensure a heat-stable product that performs as advertised. Not all of Milgard’s windows are Energy Star certified, so be sure to mention that you want Energy Star windows when inquiring.
How much does Milgard Windows & Doors cost in Ontario?Milgard does not list prices on its website, but it offers different kinds of windows at varying price points. You can ask for a free quote on its website for more information about pricing.

Renewal by Andersen
Great industry reputation
Award-winning company
Member of US Green Building Council
Manufactures products in-house
No lifetime warranty
More expensive than competition
Renewal by Andersen has the best availability in Ontario. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has been in the window installation industry for around 27 years.
If you’re looking for a company that uses in-home estimates and advanced digital tools to help you plan and visualize your project before getting started, Andersen may be the company for you.
Energy Efficiency of Renewal by Andersen WindowsA handful of windows manufactured by the Andersen corporation were awarded Energy Star’s “Most Efficient” in 2021, and Andersen was named Energy Star’s Partner of the Year in 2019. Not all of Andersen’s windows are Energy Star certified, so be sure to mention that you want Energy Star windows when inquiring.
How much does Renewal by Andersen cost in Ontario?Andersen does not list prices on its website, but based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. You can ask for a free quote on its website for more information about pricing.
We aim to be unbiased and transparent by including pros and cons for every provider. Additionally, any partnerships do not influence our reviews.
More Window Companies in Ontario
Renewal by Andersen of Los Angeles
Torrance, CAGood Customer Service
Free assessment
Price Transparency
Educational Website
Services Offered
Glass Doors
Double-Hung
Bay Windows
Window Replacement/Installation
Skylights
United Builders Windows & Doors
Rancho Cucamonga, CAPrice Transparency
Educational Website
Free assessment
Good Customer Service
Services Offered
Bay Windows
Double-Hung
Glass Doors
Window Replacement/Installation
Energy-Efficient Options
SoCal Window Pros
San Dimas, CAFree assessment
Good Customer Service
Educational Website
Services Offered
Window Replacement/Installation
Hometime Windows & Doors
Upland, CAFree assessment
Good Customer Service
Price Transparency
Educational Website
Services Offered
Energy-Efficient Options
Glass Doors
Window Replacement/Installation
Molding's Plus Inc
Ontario, CAGood Customer Service
Price Transparency
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Glass Doors
La Verne Glass &Screen
La Verne, CAGood Customer Service
Free assessment
Price Transparency
Services Offered
Mirrors
Custom Window Designs
Custom Glass
Glass Showers
Glass Doors
Window Replacement/Installation
J. R. Door & Window Inc
Upland, CAPrice Transparency
Educational Website
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Madison Window Products
Rancho Cucamonga, CAGood Customer Service
Services Offered
Double-Hung
Energy-Efficient Options
Window Replacement/Installation
Vinyl Frames
Retro Windows and Patio Doors LLC
Fontana, CAEducational Website
Free assessment
Good Customer Service
Price Transparency
Services Offered
Glass Doors
Energy-Efficient Options
Tempered Glass
Window Replacement/Installation
The Glass Company
Rancho Cucamonga, CAEducational Website
Free assessment
Price Transparency
Good Customer Service
Services Offered
Glass Showers
Glass Repair
Window Replacement/Installation
Design Windows and Doors Inc.
Ontario, CAPrice Transparency
Good Customer Service
Timely Service
Educational Website
Free assessment
Services Offered
Bay Windows
Fiberglass Frames
Energy-Efficient Options
Window Replacement/Installation
Double-Hung
Glass Doors
Wood Frames
Vinyl Frames
Mancino Door & Window, Inc.
Glendora, CAPrice Transparency
Good Customer Service
Educational Website
Free assessment
Services Offered
Window Replacement/Installation
Window World of Los Angeles
Covina, CAGood Customer Service
Price Transparency
Educational Website
Free assessment
Services Offered
Double-Hung
Bay Windows
Window Replacement/Installation
Glass Doors
Vinyl Frames
CDA Windows and Doors
Mira Loma, CAEducational Website
Good Customer Service
Timely Service
Free assessment
Price Transparency
Services Offered
Glass Doors
Vinyl Frames
Window Replacement/Installation
Andes windows & doors
Norco, CAEducational Website
Free assessment
Price Transparency
Good Customer Service
Services Offered
Double-Hung
Window Replacement/Installation
Vinyl Frames
Bay Windows
Glass Doors
Window Professors
San Dimas, CAGood Customer Service
Educational Website
Timely Service
Free assessment
Price Transparency
Services Offered
Window Replacement/Installation
Energy Core Construction
Anaheim, CAGood Customer Service
Educational Website
Timely Service
Free assessment
Price Transparency
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Bay Windows
Glass Doors
A Super Glass
Riverside, CAPrice Transparency
Good Customer Service
Services Offered
Glass Doors
Mirrors
Glass Showers
Window Replacement/Installation
Glass Repair
Window Repair
WMB Windows
Ontario, CAFree assessment
Price Transparency
Good Customer Service
Educational Website
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Vinyl Frames
Home Services at The Home Depot
Ontario, CAPrice Transparency
Free assessment
Educational Website
Good Customer Service
Services Offered
Energy-Efficient Options
Custom Window Designs
Window Replacement/Installation
Screen Repair
Glass Showers
Storm/Impact Windows
Vinyl Frames
Mirrors
Glass Doors
Calculate how much you can expect to pay for window installation and replacement in Ontario, CA using our customized window cost calculator.
Estimates will vary based on window dimensions and other unique factors to your home. Getting in touch with a local window installer is the best way to get an accurate cost estimate for your home.
How Installing Energy-Efficient Windows in Ontario Saves You Money
There are quite a few perks of switching to energy-efficient windows. A few reasons you may want to consider making the switch include the following:
- Save money on electricity bills: Upgrading to energy-efficient windows lowers your energy bills by about 12% since you need less energy.
- Protect your investment: When you have an older home, your windows could also be outdated or drafty. Upgrading your windows is an important part of maintaining your property and its value.
- Protect your valuables: Many Energy Star certified windows have low-emissivity coatings, which filter out harmful UV rays, reducing fading of your furniture, carpet and other valuables.
- Reduce your carbon footprint: Reducing how much energy you use also lowers your indirect greenhouse gas emissions. You could reduce it by 117 pounds per year on average.
Estimated Cost of Window Replacement in Ontario
Windows come in various shapes and sizes, so costs and services will vary remarkably. Here are the typical costs and services that you can find from window installation companies.
How Much Do New Windows Cost?
According to our research, the national average cost of installing a single window is around $600. However, window replacement costs can range from $200 to $1,200 for each window. How much it will cost varies based on several factors, such as size, number of windows, material, type, the location of your home and more.
Bear in mind that energy-efficient windows may cost more, but Energy Star estimates the upgrade will save you between $101 and $583 per year when installing single-pane windows and between $27 and $197 per year when you install double-pane, clear glass windows. These savings vary depending on your local climate, energy rates and individual home characteristics.
How much your window installation costs will also vary based on the type of material you choose for the frames. Wood windows are generally the most expensive, although it depends on whether they are solid wood or clad with aluminum or vinyl. Fiberglass windows also tend to be somewhat more expensive than vinyl, but they are shown to be more efficient.
What Services do Window Installers Offer?
When it comes to window replacements, in general there are two types that your provider will offer: full-frame and pocket installations.
Full-frame installations are usually recommended when you want to change the style of your windows or your window has significant rot or deterioration. With this service, your installers will replace the entire window, including the frame, trim and sill. Pocket installations (or retrofits) involve replacing a window within its existing frame, which makes pocket installations more simple and affordable. But, if the frame has any rot or deterioration, you should opt for a full-frame installation instead.
Your window replacement company will be able to help you choose what’s best for your needs. In Ontario, the decision will mostly be based on how old your home is and if there’s any damage. Wood can decay if not maintained properly over the years, so it’s a good idea to have a professional check your frames and window sills.
Best Availability
Renewal by Andersen
- Great industry reputation
- Member of US Green Building Council
- Manufactures products in-house
Power Home
- Uses eco-friendly materials
- Well-trained, certified installers
- Lifetime or lengthy warranty
Best for Residential Windows
Window Nation
- Custom Designs
- Wide variety of products and services
- Manufactures products in-house
How We Choose the Best Window Installers in Ontario
EcoWatch differs from other reviewers because we look at these companies through a sustainability lens. Along with energy efficiency, we evaluated window companies all across the state and assigned rankings based on the following methodology:
Service Area
Because this is a guide for Ontario, we paid more attention to companies that serve the city. There are certainly reputable providers that didn’t make our list because of the low odds that they would serve the average homeowner in Ontario.
Work Quality
We’re willing to bet that you’re looking for professionals who do a great job installing windows. We’ve vetted each installer on this list to ensure its technicians are well-qualified and that the company has gotten a lot of positive customer feedback to vouch for its service.
Customer Reviews
We analyzed patterns in recent online reviews to find the companies with the most customer satisfaction, weighted by sample size. Customer satisfaction may be the factor we place the most value on, as it reflects the quality of services across most other categories, including cost, quality of parts, quality of installation, professionalism, warranty and more.
Cost
This one is a give-and-take: as with other services, cheap window installers won’t always provide the most quality service. On the other hand, we want to make sure we’re highlighting companies that offer a wide range of price and financing options so they’re accessible to most homeowners.
Warranty
Protecting your investment in new windows is important. For that reason, window installation companies that have lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Due to Ontario’s climate, homeowners will want to mitigate rot, low efficiency and water damage. We factored in local experience to reflect the ability of Ontario window companies to prepare homes for the climate. If a company has less than 10 years of experience, it loses points in this category.
Ontario, CA Window Replacement FAQs
What is the average cost to install new windows in a home?
The national average cost of replacing a window is about $600 but can range from $200 to $1,200, depending on several factors. The price is typically dependent on the size of the window, the type and material of the window and the location of your property. Also, remember that energy-efficient windows may cost more upfront but can save you hundreds of dollars a year in energy bills.
What are the most common types of replacement windows?
There are various types of windows you can get for your home, including transom windows, picture windows, slider windows, awning windows, double-hung and single-hung windows, casement windows and bay windows.
When do I have to use a window installation company?
Unless you’re handy and have all the tools you need to replace your own windows, we recommend hiring the pros. The process of installing windows is quite involved and can take anywhere from four to six hours for one window. Although it’s tempting to try to save some money by doing it yourself, hiring a professional is a faster, more efficient and much safer alternative.
How often do you need to replace your windows?
Windows have an average lifespan of about 20 to 30 years. If your windows are older than that, they should probably be replaced. Apart from that, if your windows have any damage on them, or they have become difficult to open or close, they may be in need of replacement.