20 Best Window Companies in Simi Valley, CA (2023 Reviews)
Thinking of improving your house's value? The best window replacement companies can help.
We analyzed all the top-rated window companies in Simi Valley and selected the best 20 based on:
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Customer reviews
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Window installation expertise
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Popularity with home-owners like you
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Updated September 15, 2023
Why you can trust EcoWatch
A guide on the best window installation 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. Traditional, outdated windows could lead to spending more on electricity bills during the winter or summer months.
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.
Efficient windows are of particular importance 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 a year.
Best Availability
Renewal by Andersen
- Great industry reputation
- Member of US Green Building Council
- Manufactures products in-house
Window Veteran
Window World
- EnergyStar Partner
- Wide variety of products and services
- Lifetime Warranty
Best Window Installation & Replacement Companies in Simi Valley
The EcoWatch team examined dozens of installers across the country to find the best window companies for our readers. The companies in this article passed our review standards for energy-efficient offerings as well as price, customer service, local expertise and beyond.

Window World
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EnergyStar Partner
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Large serice area
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Low prices relative to competitors
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Great industry reputation
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Lifetime warranty
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Quality of service will depend on your area
Window World offers windows expertise in Simi Valley. This company has been operating since 1995 and currently provides services to 200 locations nationwide. Its reputation is backed by hundreds of positive reviews on customer review websites.
You may want to consider picking Window World if you're interested in a installer 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 has some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to mention that you want Energy Star windows when inquiring. 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 Simi Valley?Window World does not mention prices on its website, but it's known for offering some of the most affordable window installations around. If you’d like to know for sure, you can request a quote on the company’s website.

Milgard Windows & Doors
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EnergyStar Partner
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Wide network of installers
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Lifetime warranty available
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Entails hiring third-party contractors
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Limited additional services
Milgard Windows & Doors offers the best local installation in Simi Valley. This company has been operating since 1962 and currently provides services to Anaheim, Riverside, Los Angeles, San Bernardino and Orange counties. Its reputation is backed by hundreds of positive reviews on customer review websites.
You may want to consider picking Milgard if you're interested in a installer 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 has some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to mention that you want Energy Star windows when inquiring. 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 Simi Valley?Milgard does not mention prices on its website, but it offers different kinds of windows at varying price points. If you’d like to know for sure, you can request a quote on the company’s website.

Renewal by Andersen
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Great industry reputation
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Award-winning company
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Member of US Green Building Council
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Manufactures products in-house
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No lifetime warranty
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More expensive than competition
Renewal by Andersen offers the best availability in Simi Valley. This company has been operating since 1995 and currently provides services to nearly every state except Mississippi and West Virginia. Its reputation is backed by hundreds of positive reviews on customer review websites.
You may want to consider picking Andersen if you're interested in a installer 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 has some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to mention that you want Energy Star windows when inquiring. 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 Simi Valley?Andersen does not mention 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. If you’d like to know for sure, you can request a quote on the company’s website.

Universal Windows Direct
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Makes charitable contributions
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Manufactures products in-house
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Wide variety of products and services
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Lifetime warranty
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Limited service area
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Some installations carried out by third-party contractors
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Quality of service will depend on your area
Universal Windows Direct provides the best warranty in Simi Valley. This provider has 20 years of experience in the window installation business, and it has become one of the most reputable companies in the business. The provider has many positive reviews from customers on online review websites.
It has established itself as a company that has an industry-leading warranty covering products, parts and workmanship for life.
Energy Efficiency of Universal Windows Direct WindowsThe company offers energy-efficient UniShield brand windows. According to its website, UniShield window packages have higher gas fill rates and longer gas retention than most other brands on the market, and they are Energy Star products. Not all of Universal’s windows are Energy Star certified, so be sure to mention that you’re interested in Energy Star windows when inquiring.
How much does Universal Windows Direct cost in Simi Valley?Though prices are not available on Universal’s website, installations typically range from $225 to $425 per window based on customer feedback. That makes Universal Windows Direct more of a budget-friendly option for window repair and replacements. For more detailed information on the cost, you can get a quote from the company.
We aim to be unbiased and transparent by describing pros and cons for each installer. Additionally, any partnerships do not influence our rankings.
More Window Companies in Simi Valley
Renewal by Andersen of Los Angeles
Torrance, CA-
Educational Website
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Price Transparency
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Good Customer Service
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Free assessment
Services Offered
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Double-Hung
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Sliding Glass
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Glass Showers
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Residential Windows
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Custom Window Designs
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Stained Glass
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Fast Delivery
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Window Replacement
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Commercial Windows
Window World of Los Angeles
Covina, CA-
Free assessment
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Good Customer Service
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Educational Website
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Price Transparency
Services Offered
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Custom Window Designs
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Window Replacement
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Fast Delivery
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Residential Windows
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Sliding Glass
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Bay Windows
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Double-Hung
American Vision Windows
Simi Valley, CA-
Price Transparency
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Educational Website
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Good Customer Service
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Free assessment
Services Offered
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Energy-Efficient Options
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Fast Delivery
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Window Replacement
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Custom Window Designs
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Glass Showers
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Bay Windows
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Sliding Glass
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Double-Hung
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Residential Windows
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Aluminum Window Frames
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Stained Glass
Nu-Star Glass and Mirror
Simi Valley, CA-
Price Transparency
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Free assessment
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Good Customer Service
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Educational Website
Services Offered
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Commercial Windows
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Custom Window Designs
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Sliding Glass
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Window Repair
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Energy-Efficient Options
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Window Replacement
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Glass Showers
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Residential Windows
The Window Factory
Simi Valley, CA-
Free assessment
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Good Customer Service
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Price Transparency
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Educational Website
Services Offered
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Commercial Windows
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Sliding Glass
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Window Replacement
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Double-Hung
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Energy-Efficient Options
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Bay Windows
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Residential Windows
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Fast Delivery
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Custom Window Designs
Emergency Glass repair and Board Up
Thousand Oaks, CA-
Educational Website
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Good Customer Service
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Price Transparency
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Free assessment
Services Offered
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Window Replacement
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Sliding Glass
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Window Repair
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Residential Windows
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Fast Delivery
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Glass Showers
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Commercial Windows
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Custom Window Designs
Arrow Glass of Thousand Oaks
Thousand Oaks, CA-
Free assessment
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Good Customer Service
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Price Transparency
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Educational Website
Services Offered
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Window Replacement
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Double-Hung
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Residential Windows
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Window Repair
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Glass Showers
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Sliding Glass
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Commercial Windows
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Custom Window Designs
Community Glass & Mirror
Simi Valley, CA-
Educational Website
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Good Customer Service
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Price Transparency
Services Offered
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Glass Showers
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Custom Window Designs
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Residential Windows
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Window Replacement
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Commercial Windows
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Sliding Glass
Progressive Insulation & Windows
Chatsworth, CA-
Free assessment
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Good Customer Service
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Educational Website
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Price Transparency
Services Offered
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Custom Window Designs
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Window Replacement
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Energy-Efficient Options
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Fast Delivery
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Residential Windows
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Double-Hung
Window Design Group
Thousand Oaks, CA-
Good Customer Service
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Free assessment
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Price Transparency
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Educational Website
Services Offered
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Window Replacement
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Energy-Efficient Options
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Residential Windows
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Fast Delivery
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Double-Hung
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Sliding Glass
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Aluminum Window Frames
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Custom Window Designs
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Bay Windows
My Window Solutions
Newbury Park, CA-
Free assessment
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Price Transparency
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Good Customer Service
Services Offered
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Residential Windows
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Aluminum Window Frames
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Commercial Windows
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Custom Window Designs
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Fast Delivery
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Double-Hung
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Sliding Glass
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Window Replacement
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Glass Showers
Golden Hands Builders
Woodland Hills, CA-
Price Transparency
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Timely Service
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Good Customer Service
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Free assessment
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Educational Website
Services Offered
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Double-Hung
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Fast Delivery
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Custom Window Designs
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Commercial Windows
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Residential Windows
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Window Replacement
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Glass Showers
Clear Choice USA-Simi Valley
Simi Valley, CA-
Educational Website
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Good Customer Service
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Price Transparency
Services Offered
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Custom Window Designs
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Window Replacement
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Residential Windows
Aggressive Sash & Door
Canoga Park, CA-
Free assessment
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Educational Website
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Good Customer Service
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Price Transparency
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Timely Service
Services Offered
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Residential Windows
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Custom Window Designs
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Window Replacement
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Double-Hung
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Energy-Efficient Options
Frontline Windows & More Inc.
Chatsworth, CA-
Free assessment
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Good Customer Service
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Educational Website
Services Offered
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Double-Hung
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Residential Windows
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Window Replacement
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Custom Window Designs
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Bay Windows
Frontier Windows & Doors
Canoga Park, CA-
Timely Service
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Free assessment
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Price Transparency
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Good Customer Service
Services Offered
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Sliding Glass
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Custom Window Designs
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Energy-Efficient Options
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Fast Delivery
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Residential Windows
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Double-Hung
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Aluminum Window Frames
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Window Replacement
California Vision Windows
Canoga Park, CA-
Good Customer Service
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Free assessment
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Price Transparency
Services Offered
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Residential Windows
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Window Replacement
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Aluminum Window Frames
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Custom Window Designs
Fine Windows and Doors, Inc.
Chatsworth, CA-
Good Customer Service
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Free assessment
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Price Transparency
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Educational Website
Services Offered
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Fast Delivery
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Window Replacement
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Energy-Efficient Options
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Sliding Glass
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Custom Window Designs
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Double-Hung
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Residential Windows
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Aluminum Window Frames
Sivan Windows and Doors - Los Angeles Window and Door Replacement Company
Northridge, CA-
Educational Website
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Good Customer Service
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Price Transparency
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Timely Service
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Free assessment
Services Offered
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Window Replacement
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Custom Window Designs
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Glass Showers
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Sliding Glass
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Residential Windows
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Aluminum Window Frames
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Commercial Windows
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Double-Hung
DO It Yourself Windows & Doors
Granada Hills, CAServices Offered
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Residential Windows
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Glass Showers
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Window Replacement
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Commercial Windows
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Energy-Efficient Options
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Aluminum Window Frames
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 benefit in several ways, including:
- Protect your valuables from fading: The low-emissivity coatings on many energy-efficient windows filter out damaging UV rays, preventing your furniture, carpet and other valuables from fading.
- More efficient energy usage in your home: In Simi Valley where the winters can be very chilly, energy-efficient windows reduce how much heat is lost through your windows, making it easier to keep your house warm.
- Save on energy bills: The Department of Energy estimates that heat gained or lost through windows accounts for around 25-30% of residential energy use. Upgrading to energy-efficient windows can help lower that amount, which helps you save more on your bills.
- Protect your investment: The older your home is, the more likely it is that switching to energy-efficient windows will benefit you. Older homes usually have windows that are outdated, drafty or maybe even damaged in some way. Updating your windows could help increase the value of your property if you decide to sell.
Estimated Cost of Window Replacement in Simi Valley
Each window installation company provides varying services and has different price points based on a few factors.
How Much Do New Windows Cost?
According to our market research, the average cost of replacing a single window is about $600. However, window replacement costs can range from $200 to $1,200 per window. These numbers are based on the specifics of your installation, including material, number of windows, type, size, the location of your home and more.
With windows, efficiency is one of the most important factors for many homeowners. Efficient windows may cost more off the bat, but by increasing the efficiency of your home — particularly if you live in a hot climate — they can give you decades of energy savings. According to Energy Star, purchasing certified energy-efficient windows can save Simi Valley homeowners $572+ a year after replacing single-pane windows.
Costs will also vary depending on the material you pick for your window frames. Aluminum frames are the least expensive. They're sturdy, light and easy to maintain, but offer poor insulation. Vinyl frames are a bit more expensive and offer good insulation. Composite frames made with wood fibers encased in plastic also offer good insulation and are moderately expensive. Wood frames are the most expensive and are the most in-demand. They're also aesthetically pleasing and offer decent insulation for your home.
What Services do Window Installers Offer?
When considering window installations, there are generally two types that your provider will have: full-frame and pocket installations.
Full-frame installations entail replacing the complete window, including the sill, frame and trim. Full-frame installations are necessary when you want to change the style of your windows or your window has noticeable rot or deterioration. Because full-frame installations are more involved, they will increase overall costs. Pocket installations are simpler and won't cost as much, as they entail simply replacing the window within its existing frame. But if the frame has any damage or deterioration, you may need a full-frame installation instead.
If you're still trying to decide which kind of installation to get, you can talk to your installer and get their advice. The choice mostly is influenced by the age of your window frames and if there's any damage present.
Best Availability
Renewal by Andersen
- Great industry reputation
- Member of US Green Building Council
- Manufactures products in-house
Window Veteran
Window World
- EnergyStar Partner
- Wide variety of products and services
- Lifetime Warranty
How We Choose the Best Window Installers in Simi Valley
EcoWatch reviews are different from other reviews since we assess these companies through a sustainability lens. Along with energy efficiency, we analyzed window companies all across the state and ranked them using the following methodology:
Service Area
Since this is a guide for Simi Valley, we gave more points to companies that provide services to 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
When picking new windows, the quality and variety of services can often play just as important of a role in insulation and performance as the type of window you choose. We do give window installers higher marks if they offer high-quality products, but we also factor in workmanship as reflected in customer feedback.
Customer Reviews
We analyzed patterns in recent online reviews to find 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 reflects the quality of services across nearly every category, including professionalism, cost, warranty, quality of parts, quality of installation and more.
Cost
Cheaper windows don't necessarily 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
As discussed previously, windows are a sizable investment, so you'll want to be certain that investment is well protected. Window installation companies with lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Lastly, we like to see companies that have been in the industry for quite some time. Window installation companies that have more experience will earn higher rankings by our standards. We like to see at least ten years of experience.
Simi Valley, CA Window Replacement FAQs
How much does a window install cost?
The average cost of replacing a window ranges from $450 to $650. There are several factors that influence how much it costs, which include the number of windows, your property's location, styles and sizes of windows, the materials used in designing the windows, how energy-efficient the windows are and local labor costs.
What are the types of windows?
There are various kinds of windows you can get for your house, such as picture windows, double-hung and single-hung windows, transom windows, awning windows, casement windows, bay windows and slider windows.
Do I really need to use a window installation company?
You should hire a window installation professional whenever you want to replace your windows. Installing windows is a complex process that can take a lot of time, so it's best handled by the professionals.
Should I replace my windows all at the same time?
If your windows are greater than 20 years old, you most likely need to replace all of them. By that point, they are typically less efficient, leakier and/or more damaged than new windows. Doing your windows all at once will involve less paperwork and less stress.