20 Best Window Companies in Simi Valley, CA (2025 Reviews)
Thinking about upgrading your home's windows? We’ve got all the information you need in this guide to the best window installation companies.
We analyzed all the top-rated window companies in Simi Valley 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 best window replacement companies in Simi Valley may not seem like the most captivating article on EcoWatch, but trust us, windows have a more direct impact on your life than you might realize. If your windows are drafty or damaged, you could be sending 25-30% of your home’s heat or cool air out of them.
Installing energy-efficient windows on your property can help you save money each month on your electricity bills — and you can help the environment, too.
Efficient windows are particularly important in Simi Valley, where summers are long and hot. According to Energy Star, making the switch to energy-efficient windows can save the average homeowner up to $572 per year.
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 Simi Valley
The EcoWatch team evaluated dozens of installers in Simi Valley to find the top window companies for our readers. We assessed the companies on their energy-efficient offerings, price, coverage area, customer service, local experience 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 is the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has around 27 years of experience in the window replacement industry.
You may want to consider going with Window World 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.
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 make sure you mention that you’d like Energy Star windows when inquiring.
How much does Window World cost in Simi Valley?Prices are not available on Window World’s website, as the cost of window replacement depends on how many and what type(s) of windows you need. However, it's known for offering some of the most affordable window installations around. Receiving a free quote on its website is the best way to get more accurate pricing information.

Milgard Windows & Doors
EnergyStar Partner
Wide network of installers
Lifetime warranty available
Entails hiring third-party contractors
Limited additional services
Milgard Windows & Doors is a family-owned and -operated window replacement company, which primarily serves the West Coast. Milgard has around 60 years of experience in the window replacement industry.
You may want to consider going with Milgard 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.
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 make sure you mention that you’d like Energy Star windows when inquiring.
How much does Milgard Windows & Doors cost in Simi Valley?Prices are not available on Milgard’s website, as the cost of window replacement depends on how many and what type(s) of windows you need. However, it offers different kinds of windows at varying price points. Receiving a free quote on its website is the best way to get more accurate pricing information.

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 is a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has around 27 years of experience in the window replacement industry.
You may want to consider going with Andersen 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.
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 make sure you mention that you’d like Energy Star windows when inquiring.
How much does Renewal by Andersen cost in Simi Valley?Prices are not available on Andersen’s website, as the cost of window replacement depends on how many and what type(s) of windows you need. However, based on customer feedback, you can expect to pay anywhere between $750 to $1,250 per window for an installation with Andersen. Receiving a free quote on its website is the best way to get more accurate pricing information.
We’ve recommended companies with good reputations, but note that these are national companies, so your service may depend on your local crew. We have tried to stay unbiased and transparent by including pros and cons for every company reviewed.
More Window Companies in Simi Valley
Renewal by Andersen of Los Angeles
Torrance, CA31,000+ projects completed
Free assessment
Price Transparency
Financing options available
In-home or virtual consultations
Educational Website
Good Customer Service
Services Offered
Bay Windows
Window Replacement/Installation
Double-Hung
Skylights
Glass Doors
Concierge Home Remodeling
Tarzana, CAPrice Transparency
Good Customer Service
Free assessment
Educational Website
Services Offered
Energy-Efficient Options
Window Replacement/Installation
Discount Window And Door
Redondo Beach, CAFree assessment
Good Customer Service
Price Transparency
Services Offered
Metal Frames
Skylights
Glass Doors
Vinyl Frames
Window Replacement/Installation
Energy-Efficient Options
Smart Window Company
Torrance, CAFree assessment
Educational Website
Good Customer Service
Price Transparency
Services Offered
Vinyl Frames
Glass Doors
Window Replacement/Installation
Tempered Glass
Energy-Efficient Options
Double-Hung
Hometime Windows & Doors
Glendora, CAEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
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
Harbor Construction
Huntington Beach, CAFree assessment
Good Customer Service
Educational Website
Timely Service
Price Transparency
Services Offered
Glass Doors
Energy-Efficient Options
Vinyl Frames
Double-Hung
Window Replacement/Installation
Bay Windows
Dede Windows and Doors / window replacement
Anaheim, CAAmerican-made vinyl
Energy-efficient windows and doors
Good Customer Service
Free assessment
Educational website
Educational Website
Price Transparency
Services Offered
Glass Doors
Window Replacement/Installation
Vinyl Frames
Custom Window Designs
American Vision Windows
Simi Valley, CAFree assessment
Educational Website
Price Transparency
Services Offered
Vinyl Frames
Energy-Efficient Options
Bay Windows
Window Replacement/Installation
Fiberglass Frames
Glass Doors
Double-Hung
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
Double-Hung
Glass Doors
Golden Age Builders
West Hollywood, CA3D design and planning tool
Free assessment
Price Transparency
Timely Service
Good Customer Service
Unique window options
In-home consultations
Services Offered
Window Replacement/Installation
Mancino Door & Window, Inc.
Glendora, CAPrice Transparency
Educational Website
Free assessment
Services Offered
Window Replacement/Installation
Save-On Glass & Screen
Westminster, CAGood Customer Service
Timely Service
Free assessment
Services Offered
Window Repair
Mirrors
Window Replacement/Installation
Glass Doors
Glass Showers
Best Windows and Doors OC
Anaheim, CAEducational Website
Good Customer Service
Price Transparency
Free assessment
Services Offered
Window Replacement/Installation
Custom Window Designs
Glass Doors
Vinyl Frames
Window King
Huntington Beach, CAFree assessment
Price Transparency
Educational Website
Services Offered
Glass Doors
Vinyl Frames
Double-Hung
Energy-Efficient Options
Window Replacement/Installation
The Window Factory
Simi Valley, CAFree assessment
Educational Website
Price Transparency
Good Customer Service
Services Offered
Triple Pane Glass
Double-Hung
Bay Windows
Window Replacement/Installation
Energy-Efficient Options
Vinyl Frames
Glass Doors
American Reliable Windows & Doors
Van Nuys, CAGood Customer Service
Free assessment
Educational Website
Price Transparency
Services Offered
Bay Windows
Window Replacement/Installation
Glass Doors
Double-Hung
Anytime Windows and Doors
North Hollywood, CATimely Service
Educational Website
Good Customer Service
Free assessment
Price Transparency
Services Offered
Glass Doors
Metal Frames
Fiberglass Frames
Double-Hung
Energy-Efficient Options
Window Replacement/Installation
Vinyl Frames
Home Upgrade Specialist Inc
Los Angeles, CATimely Service
Energy-efficient products
Wide range of services
Good Customer Service
Free assessment
Educational Website
Financing options available
Price Transparency
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Golden Glass
Fullerton, CAPrice Transparency
Timely Service
Free assessment
Educational Website
Good Customer Service
Services Offered
Mirrors
Glass Doors
Tempered Glass
Glass Showers
Window Replacement/Installation
Custom Glass
Glass Repair
Calculate how much you can expect to pay for window installation and replacement in Simi Valley, 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 Simi Valley Saves You Money
By switching to energy-efficient windows, you can take advantage of several benefits, including:
- Protect your valuables: Many Energy Star certified windows have low-emissivity coatings, which not only provide better insulation for your home, but also filter out damaging UV rays, preventing your furniture, carpet and other valuables from fading.
- Reduce your carbon footprint: By using less energy after you switch to energy-efficient windows, you’ll also be reducing your carbon dioxide emissions by about 12%, according to Energy Star.
- Protect your investment: Upgrading your windows is an important part of maintaining your property and its value, especially if you have an older home.
- Save on power bills: Installing energy-efficient windows reduces your energy bills by about 12% because you use less energy.
Estimated Cost of Window Replacement in Simi Valley
Each window installer provides varying services and has varying prices depending on a few factors.
How Much Do New Windows Cost?
Generally, homeowners in Simi Valley can anticipate that most replacement window installations will cost between $250 and $1,200, with the most common installations sitting at around $600. This is because the cost of window installations are based on a variety of factors specific to your home, such as the size, material and number of windows you need to replace, as well as the location of your property.
It’s also worth keeping in mind that energy-efficient windows will usually cost more initially, but Energy Star estimates that upgrading the windows on your Simi Valley home can mean an average energy savings of $236 to $319 a year for single-pane window replacement, or between $87 to $126 a year for double-pane windows. The amount of money you’ll save by switching to energy-efficient windows varies based on your local climate, energy rates and other factors unique to your home.
Another factor that affects the total cost is the material of the frame you choose. Aluminum frames are typically the least expensive and are sturdy and light, but they offer poor insulation. On the other hand, wood frames are the most expensive because they are aesthetically pleasing and offer decent insulation. Fiberglass and vinyl frames provide good insulation and cost somewhere between the other two.
What Services do Window Installers Offer?
The first step when considering a window replacement is to clarify whether you need a full-frame or pocket installation.
Full-frame installations require replacing the full window — the sill, frame, trim and all. These are most common when you want to change the style of your window or when it has a great amount of damage. Full-frame installations require more time and labor and will increase overall costs. Pocket installations (or retrofits) involve replacing a window within the existing frame, which makes pocket installations more simple and affordable. However, if the frame has any damage or rot, you will likely need a full-frame installation instead.
Your window installer should be able to help you choose which type of installation you need.
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 Simi Valley
EcoWatch reviews are different from other reviews because we examine these companies through a sustainability lens. We’ve evaluated the top window installation companies in Simi Valley primarily based on energy efficiency, as it’s the most sustainable option and the best one for homeowners. Energy Star certified windows can lower energy bills by hundreds of dollars. Along with energy efficiency, our rating methodology considers the following factors:
Service Area
Because this is a guide for Simi Valley, we paid more attention to companies that serve the city. There are certainly other reputable providers that didn’t make our list because they wouldn’t be able to serve homeowners in Simi Valley.
Work Quality
We’re certain that you’re looking for professionals who do a great job installing windows. We’ve vetted each company included on this list to ensure its contractors are well-qualified and that the company has received lots of positive customer feedback to vouch for its service.
Customer Reviews
We analyzed trends in recent online reviews to determine the companies with the most consistent customer satisfaction, weighted by sample size. Customer satisfaction may be the most important factor, as it reflects the quality of services across nearly every category, including quality of installation, warranty, professionalism, quality of parts, cost and more.
Cost
This one is a give-and-take: similar to other services, cheap window installation companies are not going to provide the highest quality service. On the other hand, we want to make sure we’re highlighting companies that provide a spectrum of price and financing options so they’re accessible to most homeowners.
Warranty
Protecting your investment in new windows is important. That’s why window installation companies that give you lengthy warranties for products, parts and labor rank higher with EcoWatch.
Years of Experience
Due to Simi Valley’s climate, homeowners will want to mitigate water damage, rot and low efficiency. We factored in local experience to reflect the ability of Simi Valley window companies to prepare homes for these issues. If a company has less than 10 years of experience, it loses points in this category.
Simi Valley, CA Window Replacement FAQs
What is the average cost to install windows in a home?
The national average cost of replacing a single window is around $600 but can range from $200 to $1,200, depending on a few different factors. The price is often influenced by the type and material of the window, the location of your property and the size of the window. Also, bear in mind that energy-efficient windows may cost more upfront but can save you a decent amount of money a year in energy bills.
What type of window is the best for energy efficiency?
Generally, double-pane windows will be more efficient than single-pane windows and windows that do not open are more efficient than windows that do. If you want to be sure you’re getting the most energy-efficient windows, look for models that have the blue Energy Star certification attached to them — this means they’re certified energy-efficient by the U.S. Department of Energy.
What do window installers do?
Window installers will do the entire process — from replacing old windows with brand-new ones to cleaning up after the installation. In addition, some companies offer window manufacturing, customization and repairs.
When is the best time of year to replace windows?
Replacement windows can be installed any time of the year, but autumn might be the best season. No matter when you install them, the contractors will take steps to ensure that too much hot or cold air doesn’t get into the home, so the temperature outside isn’t necessarily a big factor. What’s most important is that the weather should be dry.
Should I replace all my windows at once?
If you’re upgrading your windows because of energy-efficiency, replacing all of the windows at once is the only way to gain that benefit. However, if you have only one or two windows that are broken or drafty, you can replace just those.