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Best Window Replacement Companies in Simi Valley, CA

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Written By Max Peterson|Last Updated: February 05, 2024

You might be installing new windows to upgrade your home's design, improve your energy efficiency, or protect your home from inclement weather. Local contractors recognize that homeowners would prefer not to pay a fortune for window replacement in Simi Valley. They work with innovative materials that don't compromise on durability.

Top Pick
  • Full-service installation
  • Large window selection
  • Nearly 30 years of experience
Best Financing
  • Full-service installation
  • In-house, U.S.-made products
  • More than 70 years of experience
Most Customizable
  • Full-service remodeling
  • 96% satisfaction rate
  • More than 30 years of experience

Top 10 Simi Valley Window Installation Companies

The providers on this collection will make window replacement in Simi Valley as painless as possible.

Simi Valley residents can trust the This Old House Reviews Team to provide relevant, current window installer recommendations. To find out the best installers, we focus on these five traits:

  • Professional experience and licensure
  • Energy-efficiency guarantees
  • Customer reviews and recommendations
  • Services and warranties
  • Product quality
Window World of Los Angeles Logo

Window World of Los Angeles

Based on 31 customer reviews.

Services Offered

Window Replacement/installationBay WindowsGlass DoorsVinyl FramesDouble-Hung


  • Free assessment
  • Good customer service
  • Educational website
718 Arrow Grand Cir, Covina, CA 310-564-7299 windowworldla.com
American Vision Windows Logo

American Vision Windows

Based on 1,250 customer reviews.

Services Offered

Window Replacement/installationDouble-HungGlass DoorsEnergy-Efficient OptionsBay WindowsVinyl FramesWood FramesFiberglass Frames


  • Free assessment
  • Price transparency
  • Educational website
2125 Madera Rd, Simi Valley, CA 805-864-5452 americanvisionwindows.com
Milgard Windows & Doors Logo

Milgard Windows & Doors

Based on 852 customer reviews.

Services Offered

Bay WindowsEnergy-Efficient OptionsGlass DoorsDouble-HungWindow Replacement/installationFiberglass FramesMetal Frames


  • Free assessment
  • Educational website
  • Good customer service
355 E Easy St S, Simi Valley, CA 805-581-6325 milgard.com
The Window Factory Logo

The Window Factory

Based on 30 customer reviews.

Services Offered

Triple Pane GlassDouble-HungEnergy-Efficient OptionsBay WindowsWindow Replacement/installationGlass DoorsVinyl Frames


  • Educational website
  • Price transparency
  • Free assessment
1060 E Los Angeles Ave, Simi Valley, CA 805-257-1196 thewindowfactory.com
Nu-Star Glass and Mirror Logo

Nu-Star Glass and Mirror

Based on 37 customer reviews.

Services Offered

Window Replacement/installationEnergy-Efficient OptionsMirrorsVinyl FramesGlass RepairCustom GlassGlass ShowersWindow RepairGlass Doors


  • Price transparency
  • Free assessment
  • Educational website
350 E Easy St #12, Simi Valley, CA 805-582-9199 nustarglass.com
Arrow Glass Logo

Arrow Glass

Based on 15 customer reviews.

Services Offered

Window RepairMirrorsWindow Replacement/installationGlass RepairGlass Showers


  • Price transparency
  • Good customer service
  • Educational website
2540 Thousand Oaks Blvd, Thousand Oaks, CA 805-497-8152 customglassthousandoaks.com
Agoura Sash & Door, Inc. Logo

Agoura Sash & Door

Based on 42 customer reviews.

Services Offered

SkylightsGlass DoorsFiberglass FramesWindow Replacement/installation


  • Educational website
  • Free assessment
  • Good customer service
2301 Townsgate Rd, Westlake Village, CA 805-449-2840 agourasash.com
My Window Solutions Logo

My Window Solutions

Based on 22 customer reviews.

Services Offered

Glass DoorsWindow Replacement/installationMetal FramesDouble-Hung


  • Good customer service
  • Free assessment
  • Price transparency
3537 Old Conejo Rd 112 And #117, Newbury Park, CA 805-499-9111 mywindowsolutions.com
Oakstone Glass Corporation Logo

Oakstone Glass Corporation

Based on 27 customer reviews.

Services Offered

MirrorsWindow Replacement/installationGlass ShowersGlass Doors


  • Good customer service
  • Educational website
3330 Thousand Oaks Blvd, Thousand Oaks, CA 805-495-0441 oakstoneglass.com

More Local Window Companies

Progressive Insulation & Windows

User Reviews: 4.2/5 

9750 CA-27
Chatsworth, CA 91311

California Deluxe Windows

User Reviews: 4.5/5 

20735 Superior St
Chatsworth, CA 91311

Frontier Windows & Doors

User Reviews: 4.5/5 

21426 Sherman Way
Canoga Park, CA 91303

Preferred Glass And Windows

User Reviews: 3.9/5 

1296 E Los Angeles Ave
Simi Valley, CA 93065

Sivan Windows and Doors - Los Angeles Window and Door Replacement Company

User Reviews: 4.5/5 

19865 Nordhoff St
Northridge, CA 91324

Valley Doors Group

User Reviews: 4.1/5 

22530 Ventura Blvd
Woodland Hills, CA 91364

To share feedback or ask a question about this article, send a note to our Reviews Team at reviewsteam@thisoldhousereviews.com.

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Facts about Simi Valley
Annual Energy Efficient Windows Savings:$572
Average Max Temp:71°F
Average Min Temp:50°F
Average Daily Sunlight:72%
Average Annual Snowfall:0.0"
Average Monthly Precipitation:1.62"

Expert Tips By

This Old House empowers homeowners with the knowledge and tools they need to tackle various projects and navigate the complexities of homeownership.

How To Choose a Window Company in Simi Valley

With Simi Valley's large population, you're sure to find a dependable window company in line with your values and preferences. As you gather estimates, keep the following factors in mind:

Window Cost by Type

Replacing your windows is a major purchase, so balancing cost with long life is important. Although premium windows may be more expensive to buy, they often yield better long-term value due to their extended lifespan. The final cost of your window replacement will rely on the specific sizes, styles, and materials you need. Transom windows are inexpensive with their simple size and straightforward form factor, while a custom-cut arch window in a master suite will cost more. An expert can help you with picking the products that fit your needs.

This table shows average prices for various window types to give you an idea of what to expect.

Window TypesAverage Cost
Glass Block$44-$567

Window Material Cost

Materials also help determine a window's cost. You might select a material based on your energy efficiency goals, your desired look, and the local climate. For example, wood windows can give your home an organic design without breaking the bank, but you'll have to invest more toward maintenance. Aluminum and composite windows cost more up-front, but they're incredibly durable against the elements, so you'll spend far less on maintenance.

Window TypesAverage Cost

Other Window Replacement Costs

Your total cost for window replacement will also include warranty fees (if applicable), permit application fees, and labor. Be sure to discuss each of these factors with a sales representative before committing to a window company.

Experience and Training

Select a business that focuses on window repair and installation, and look for this information on its website:

  • How long it's been in business
  • Photo galleries of projects its crews completed
  • Private certifications attesting to its workmanship
The more experience a company has, the better its service and workmanship.

Licensing and Credentials

A California window business must be licensed as a General Building Contractor, Window Coverings Contractor and Glazing Contractor if it takes on jobs valued at over $500. Each license has its own exam and work requirements. If a contractor is caught working without a license, they'll have to pay hefty penalties.

Types of Windows Offered

The type of window you want should influence your company choice. Not every installation crew will necessarily be familiar with the types you want. A company website will provide more about the kinds of windows it focuses on, such as:

  • Awning
  • Bay
  • Bow
  • Casement
  • Crank-out
  • Custom
  • Double- or single-hung
  • Egress
  • Garden
  • Jalousie
  • Picture
  • Sliding
  • Skylight
  • Specialty
  • Storm
  • Transom
  • Vent
Also, check the kind of window framing materials a company works with. Each material has different price points, life spans, and energy performance capabilities. Common materials include composite, wood, aluminum, vinyl and fiberglass.

Customer Feedback

Reading other customers' stories is a great way to screen potential window companies. Read customer reviews on sites such as Trustpilot, Yelp, and Google. You can also view customer reviews and company ratings on the Better Business Bureau (BBB) website. Referrals can also help you in your company search. Ask each company you're interested in for a list of references, and talk to family and friends about who they use for window installations.

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Frequently Asked Questions About Window Replacement in Simi Valley

How could new windows help my energy efficiency?

In Simi Valley specifically, most homeowners using efficient windows reduce their carbon emissions by 120 pounds annually. That amounts to $570 of annual savings.

The U.S. Department of Energy states that 25%–30% of a home's heating and cooling capacity is used to compensate for heat gain and heat loss through windows. By installing new, more efficient windows, you can enhance your home's energy efficiency and reduce your electricity bills.

What time of year should I replace my windows?

Since Simi Valley has very mild winters, any time is a good time to put in new windows. When you reach out to an installer, ask the representative about when demand is least. By scheduling your job during an off-peak time, you could potentially save some money on labor costs.

How can I gauge the quality of a replacement window?

You can assess the quality of a replacement window by checking some key numbers, including the following:
  • Air leakage rating, which measures how tight a window's seal is
  • Condensation resistance, which measures how a window deals with moisture
  • U-factor, which shows a window's temperature-insulating capability
  • Visible transmittance, which measures how much light passes through a window
  • Solar heat gain coefficient, which determines how much heat from sunlight can pass through the window

To share feedback or ask a question about this article, send a note to our Reviews Team at reviewsteam@thisoldhousereviews.com.

More Window Resources

National Windows Company Ranking Methodology


Energy Star