20 Best Window Companies in Thousand Oaks, CA (2025 Reviews)
Thinking of improving your home’s value? The top window replacement companies can help.
We analyzed all the top-rated window companies in Thousand Oaks 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
A guide on the top window replacement companies in Thousand Oaks may not seem like the most captivating article on the EcoWatch site, but trust us, windows have more of an impact on your life than you might realize. Drafty windows can make your home uncomfortable in the summer or winter.
Installing energy-efficient windows on your property can help you save money each month on your electricity bills — and you can help the environment as well.
We’ve made this guide on 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 electricity bills.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- 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 Thousand Oaks
The EcoWatch Reviews team assessed dozens of companies that service the Thousand Oaks area to find the top window installation companies by our standards. The providers mentioned in this article scored best in our categories, which include energy-efficient offerings, availability, customer service, price 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 Thousand Oaks. Window World has over 27 years of experience in the industry, and it currently serves 200 locations nationwide. The company has many glowing reviews from customers online.
It has established itself as a company that is certified by the Environmental Protection Agency (EPA) and Energy Star and supports charities like St. Jude Children’s Research Hospital.
Energy Efficiency of Window World WindowsWindow World’s commitment to sustainability shows in its energy-efficient window offerings. Its high-performance Low-E (low-emissivity) coatings and argon gas insulation offer exceptional efficiency and performance for any home.
How much does Window World cost in Thousand Oaks?Window World does not detail prices on its website, but it's known for offering some of the most affordable window installations around. The best way to know for sure is to receive a free quote from the company.

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 Thousand Oaks. Milgard has over 60 years of experience in the industry, and it currently serves Anaheim, Riverside, Los Angeles, San Bernardino and Orange counties. The company has many glowing reviews from customers online.
It has established itself as a company that offers competitive pricing, a comprehensive warranty and installers that all have a minimum of 15 years of window installation experience.
Energy Efficiency of Milgard Windows & Doors WindowsMilgard Windows & Doors’s commitment to sustainability shows in its energy-efficient window offerings. The 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.
How much does Milgard Windows & Doors cost in Thousand Oaks?Milgard does not detail prices on its website, but it offers different kinds of windows at varying price points. The best way to know for sure is to receive a free quote from the company.

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 Thousand Oaks. Andersen has over 27 years of experience in the industry, and it currently serves nearly every state except Mississippi and West Virginia. The company has many glowing reviews from customers online.
It has established itself as a company that uses in-home estimates and advanced digital tools to help you plan and visualize your project before getting started.
Energy Efficiency of Renewal by Andersen WindowsRenewal by Andersen’s commitment to sustainability shows in its energy-efficient window offerings. A 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.
How much does Renewal by Andersen cost in Thousand Oaks?Andersen does not detail 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. The best way to know for sure is to receive a free quote from the company.
We strive to remain unbiased and transparent by describing pros and cons for each company we review. Additionally, our rankings are not affected by any partnerships.
More Window Companies in Thousand Oaks
Renewal by Andersen of Los Angeles
Torrance, CAFree assessment
In-home or virtual consultations
Financing options available
Educational Website
31,000+ projects completed
Good Customer Service
Price Transparency
Services Offered
Bay Windows
Glass Doors
Double-Hung
Window Replacement/Installation
Skylights
Concierge Home Remodeling
Tarzana, CAGood Customer Service
Educational Website
Free assessment
Price Transparency
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Discount Window And Door
Redondo Beach, CAFree assessment
Price Transparency
Good Customer Service
Services Offered
Glass Doors
Metal Frames
Energy-Efficient Options
Window Replacement/Installation
Vinyl Frames
Skylights
Smart Window Company
Torrance, CAPrice Transparency
Good Customer Service
Free assessment
Educational Website
Services Offered
Energy-Efficient Options
Vinyl Frames
Double-Hung
Window Replacement/Installation
Tempered Glass
Glass Doors
Harbor Construction
Huntington Beach, CAEducational Website
Good Customer Service
Price Transparency
Timely Service
Free assessment
Services Offered
Vinyl Frames
Double-Hung
Bay Windows
Energy-Efficient Options
Window Replacement/Installation
Glass Doors
Hometime Windows & Doors
Glendora, CAFree assessment
Price Transparency
Educational Website
Good Customer Service
Services Offered
Glass Doors
Window Replacement/Installation
Energy-Efficient Options
SoCal Window Pros
San Dimas, CAGood Customer Service
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Dede Windows and Doors / window replacement
Anaheim, CAPrice Transparency
Free assessment
American-made vinyl
Educational website
Energy-efficient windows and doors
Good Customer Service
Educational Website
Services Offered
Window Replacement/Installation
Glass Doors
Vinyl Frames
Custom Window Designs
American Vision Windows
Simi Valley, CAPrice Transparency
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Fiberglass Frames
Glass Doors
Vinyl Frames
Double-Hung
Energy-Efficient Options
Bay Windows
Wood Frames
CGH Solutions - California Green Home Solutions
Van Nuys, CAEducational Website
Good Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Vinyl Frames
Glass Doors
Double-Hung
Golden Age Builders
West Hollywood, CA3D design and planning tool
Unique window options
Price Transparency
Timely Service
Good Customer Service
In-home consultations
Free assessment
Services Offered
Window Replacement/Installation
Save-On Glass & Screen
Westminster, CAGood Customer Service
Free assessment
Timely Service
Services Offered
Glass Showers
Glass Doors
Window Replacement/Installation
Window Repair
Mirrors
Mancino Door & Window, Inc.
Glendora, CAEducational Website
Price Transparency
Free assessment
Services Offered
Window Replacement/Installation
Window King
Huntington Beach, CAPrice Transparency
Educational Website
Free assessment
Services Offered
Glass Doors
Vinyl Frames
Window Replacement/Installation
Energy-Efficient Options
Double-Hung
Best Windows and Doors OC
Anaheim, CAPrice Transparency
Good Customer Service
Educational Website
Free assessment
Services Offered
Vinyl Frames
Window Replacement/Installation
Glass Doors
Custom Window Designs
The Window Factory
Simi Valley, CAPrice Transparency
Educational Website
Good Customer Service
Free assessment
Services Offered
Bay Windows
Glass Doors
Double-Hung
Window Replacement/Installation
Vinyl Frames
Energy-Efficient Options
Triple Pane Glass
American Reliable Windows & Doors
Van Nuys, CAEducational Website
Free assessment
Good Customer Service
Price Transparency
Services Offered
Double-Hung
Window Replacement/Installation
Bay Windows
Glass Doors
Home Upgrade Specialist Inc
Los Angeles, CATimely Service
Wide range of services
Free assessment
Good Customer Service
Educational Website
Energy-efficient products
Financing options available
Price Transparency
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Anytime Windows and Doors
North Hollywood, CAGood Customer Service
Educational Website
Timely Service
Price Transparency
Free assessment
Services Offered
Double-Hung
Window Replacement/Installation
Glass Doors
Metal Frames
Fiberglass Frames
Energy-Efficient Options
Vinyl Frames
Golden Glass
Fullerton, CAFree assessment
Timely Service
Good Customer Service
Price Transparency
Educational Website
Services Offered
Glass Repair
Tempered Glass
Glass Doors
Custom Glass
Window Replacement/Installation
Mirrors
Glass Showers
Calculate how much you can expect to pay for window installation and replacement in Thousand Oaks, 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 Thousand Oaks Saves You Money
By upgrading to energy-efficient windows, you can enjoy several benefits, such as:
- Protect your valuables from fading: The low-emissivity coatings on many energy-efficient windows filter out harmful UV rays, preventing your furniture, carpet and other valuables from fading.
- Decrease your carbon footprint: In Thousand Oaks, you can lower your indirect greenhouse gas emissions by about 117 pounds per year after you upgrade to energy-efficient windows.
- Save money on electricity bills: The Department of Energy estimates that heat gained or lost through windows makes up around 25-30% of residential energy use. Upgrading to energy-efficient windows can help lower that number, which helps you save some money on your bills.
- Protect your investment: Upgrading and repairing your windows is an important part of maintaining your property and its real estate value, particularly if your home is on the older side.
Estimated Cost of Window Replacement in Thousand Oaks
Let’s take a look at the cost of replacing your windows and the types of services offered by installers.
How Much Do New Windows Cost?
According to our research, the average cost of replacing a single window is about $600. However, window replacement costs can range from $200 to $1,200 a window. But prices differ remarkably depending on the size of your home, complexity of the installation, your location and the quality of the company you choose. Many window companies also provide door replacements, which will add extra costs to your project.
It’s important to bear in mind that windows with the best efficiency may cost more initially but can save you hundreds of dollars via returns on your energy bills. Investing in Energy Star certified windows can save Thousand Oaks homeowners $572+ a year when replacing single-pane windows.
We advise requesting free quotes from multiple window installers to find the right windows and the company that works best for you.
What Services do Window Installers Offer?
The first step of a window installation is to clarify whether you need a full-frame or pocket installation.
Full-frame installations are usually recommended when you want to change the style of your windows or your window has significant deterioration. With this service, your installers will replace the entire window, including the trim, frame and sill. Pocket installations (also known as retrofits) are when you replace a window while leaving the existing frame. Pocket installations are simpler and won’t carry as large a bill, but you can’t do this type of installment if you have any pre-existing rot or water damage.
If you’re not sure which type of window installation service you should get, your installer should be able to advise you. In general, the choice is influenced by factors like the age and condition of the home, the type of building material, budget and time restrictions.
Best Availability
Renewal by Andersen
- Great Industry Reputation
- Award-winning Company
- 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 Thousand Oaks
In our search to make your home improvements easier and more eco-friendly in Thousand Oaks, the EcoWatch team assessed many companies before deciding on these. We’ve assessed the best window replacement companies in Thousand Oaks mainly based on their energy efficient offerings, as it’s the most sustainable option and the best one for homeowners. Energy Star certified windows can reduce your electricity bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:
Service Area
This one is self-explanatory, but we’ve chosen to highlight window installation companies that serve a wide variety of states and cities so you can find the best window installation company near you.
Work Quality
We’re willing to bet that you’re not looking for a company to do a shoddy job installing windows. We’ve vetted each installer featured in our guide to make sure its contractors are well-qualified and that the company has received tons of positive customer feedback to vouch for its service.
Customer Reviews
We analyzed patterns in recent customer feedback to determine the companies with the most consistent customer satisfaction, weighted by sample size. Customer satisfaction may be the factor we place the most value on, as it indicates the quality of services across nearly every category, including warranty, professionalism, cost, quality of installation, quality of parts and more.
Cost
Cheaper windows certainly don’t mean better windows, but we know many of our readers would like to keep costs low when possible. When analyzing the prices of providers, we awarded higher points to companies with reasonable prices and accessible financing rather than “cheaper” services.
Warranty
Protecting your investment in new windows is important. For that reason, window installation companies that offer lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Because of Thousand Oaks’s climate, homeowners will want to mitigate low efficiency, water damage and rot. We factored in local experience to reflect the ability of Thousand Oaks window companies to prepare homes for these issues. If a company has less than 10 years of experience, it loses points in this category.
Thousand Oaks, CA Window Replacement FAQs
What is the typical cost to replace windows in a home?
The average cost of installing a single window can range between $450 and $650. There are a variety of factors that influence the price, which include how energy-efficient the windows are, the materials used in designing the windows, your property’s location, the number of windows, local labor costs and styles and sizes of windows.
What are the different kinds of windows?
The most common types of windows for homes include: awning windows, double-hung and single-hung windows, slider windows, transom windows, bay windows, casement windows and picture windows.
What services do window installation companies provide?
Window installation professionals will do the entire process — from replacing your old windows with new ones to cleaning up after the installation. In addition, some companies offer window manufacturing, customization and repairs.
How long does it usually take to install windows?
Each window takes about 30 minutes to install based on the kind of window. However, the window installation can take two days or more if you need to have a lot of windows installed.