20 Best Window Companies in Walnut, CA (2025 Reviews)
Thinking of improving your property’s appearance? The top window replacement companies can help.
We analyzed all the top-rated window companies in Walnut and selected the best 20 based on:
Customer reviews
Window installation expertise
Popularity with home-owners like you
Please enter a valid 5-digit zip code!
Why you can trust EcoWatch
Whether you're doing renovations or have windows that need repairs, windows play a key role in conserving energy in your home. If your house has traditional, outdated windows, your AC or heater could be working extra hard to heat or cool your house. This means higher energy bills.
That’s bad news for your wallet and the environment, but one of the best window installation companies can help you with that.
We’ve made this list of the top installation companies to help you in your search, so you can not only enjoy 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 Walnut
The EcoWatch Reviews team researched several window providers across Walnut to narrow our list down to the top ones. The companies in this article scored best in our categories: 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 offers windows expertise in Walnut. This window installation company has been in business since 1995 and currently services 200 locations nationwide. Its reputation is backed by all the positive reviews on customer review websites.
It 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 WindowsThere are a wide range of window types available from Window World, some of which are Energy Star products. 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 Walnut?Prices are not available on Window World’s website because the cost of window replacement differs based 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. Requesting 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 offers the best local installation in Walnut. This window installation company has been in business since 1962 and currently services Anaheim, Riverside, Los Angeles, San Bernardino and Orange counties. Its reputation is backed by all the positive reviews on customer review websites.
It 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 WindowsThere are a wide range of window types available from Milgard Windows & Doors, some of which are Energy Star products. 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 Walnut?Prices are not available on Milgard’s website because the cost of window replacement differs based on how many and what type(s) of windows you need. However, it offers different kinds of windows at varying price points. Requesting 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 offers the best availability in Walnut. This window installation company has been in business since 1995 and currently services nearly every state except Mississippi and West Virginia. Its reputation is backed by all the positive reviews on customer review websites.
It 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 WindowsThere are a wide range of window types available from Renewal by Andersen, some of which are Energy Star products. 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 Walnut?Prices are not available on Andersen’s website because the cost of window replacement differs based 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. Requesting a free quote on its website is the best way to get more accurate pricing information.
We’ve recommended installers with good reputations, but note that these are national companies, so the quality of service may depend on your local crew. We have tried to remain unbiased and transparent by listing pros and cons for every company reviewed.
More Window Companies in Walnut
Renewal by Andersen of Orange County
Laguna Hills, CAEducational Website
Good Customer Service
Free assessment
Price Transparency
Services Offered
Double-Hung
Glass Doors
Bay Windows
Window Replacement/Installation
SoCal Window Pros
San Dimas, CAEducational Website
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Hometime Windows & Doors
Glendora, CAPrice Transparency
Good Customer Service
Free assessment
Educational Website
Services Offered
Glass Doors
Energy-Efficient Options
Window Replacement/Installation
Dede Windows and Doors / window replacement
Anaheim, CAAmerican-made vinyl
Free assessment
Energy-efficient windows and doors
Price Transparency
Good Customer Service
Educational website
Educational Website
Services Offered
Vinyl Frames
Glass Doors
Window Replacement/Installation
Custom Window Designs
Andes windows & doors
Norco, CAGood Customer Service
Offers window treatments
Free assessment
Educational Website
Online portfolio
Price Transparency
Spanish-speaking
Services Offered
Vinyl Frames
Bay Windows
Window Replacement/Installation
Glass Doors
Double-Hung
Harbor Construction
Huntington Beach, CAGood Customer Service
Timely Service
Educational Website
Free assessment
Price Transparency
Services Offered
Glass Doors
Energy-Efficient Options
Vinyl Frames
Double-Hung
Window Replacement/Installation
Bay Windows
United Builders Windows & Doors
Rancho Cucamonga, CAPrice Transparency
Good Customer Service
Educational Website
Free assessment
Timely Service
Services Offered
Bay Windows
Glass Doors
Window Replacement/Installation
Double-Hung
Energy-Efficient Options
Retro Windows and Patio Doors LLC
Fontana, CAFree assessment
Energy-efficient windows and doors
Good Customer Service
Price Transparency
Lifetime warranty
Educational Website
Family-owned and operated
Services Offered
Tempered Glass
Glass Doors
Window Replacement/Installation
Energy-Efficient Options
California Window & Solar
Costa Mesa, CAPrice Transparency
Good Customer Service
Educational Website
Free assessment
Services Offered
Vinyl Frames
Energy-Efficient Options
Window Replacement/Installation
Glass Doors
Metal Frames
Smart Window Company
Torrance, CAEducational Website
Free assessment
Good Customer Service
Price Transparency
Services Offered
Vinyl Frames
Tempered Glass
Window Replacement/Installation
Double-Hung
Energy-Efficient Options
Glass Doors
Discount Window And Door
Redondo Beach, CAPrice Transparency
Free assessment
Good Customer Service
Services Offered
Vinyl Frames
Skylights
Metal Frames
Energy-Efficient Options
Window Replacement/Installation
Glass Doors
Mancino Door & Window, Inc.
Laguna Niguel, CAFree assessment
Educational Website
Price Transparency
Services Offered
Window Replacement/Installation
Energy Core Construction
Anaheim, CAEducational Website
Free assessment
Timely Service
Good Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Glass Doors
Energy-Efficient Options
Bay Windows
TMC Windows & Doors
Orange, CAGood Customer Service
Free assessment
Price Transparency
Services Offered
Window Replacement/Installation
Glass Doors
Best Windows and Doors OC
Anaheim, CAEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
Glass Doors
Custom Window Designs
Window Replacement/Installation
Vinyl Frames
Save-On Glass & Screen
Westminster, CAFree assessment
Timely Service
Good Customer Service
Services Offered
Window Replacement/Installation
Glass Doors
Window Repair
Glass Showers
Mirrors
Can-Do Windows & Doors
Santa Ana, CAEducational Website
Free assessment
Price Transparency
Services Offered
Glass Doors
Wood Frames
Fiberglass Frames
Double-Hung
Vinyl Frames
Energy-Efficient Options
Metal Frames
Window Replacement/Installation
Window King
Huntington Beach, CAFree assessment
Price Transparency
Educational Website
Services Offered
Vinyl Frames
Glass Doors
Double-Hung
Energy-Efficient Options
Window Replacement/Installation
Golden Age Builders
West Hollywood, CAUnique window options
Timely Service
Price Transparency
3D design and planning tool
In-home consultations
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Ameristar Windows
Riverside, CAFree assessment
Price Transparency
Good Customer Service
Services Offered
Glass Doors
Glass Showers
Vinyl Frames
Energy-Efficient Options
Window Replacement/Installation
Calculate how much you can expect to pay for window installation and replacement in Walnut, 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 Walnut Saves You Money
When you switch to energy-efficient windows, you may see some benefits, including:
- Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which filter out harmful UV rays, reducing fading of your furniture, carpet and other valuables.
- Protect your investment: When your home is on the older side, your windows could also be outdated or leaky. Upgrading your windows is an important part of maintaining your property and its real estate value.
- Decrease your carbon footprint: Decreasing the amount of energy you use also lowers your carbon emissions. You could reduce it by about 117 pounds.
- Save money on electricity bills: According to the Department of Energy, heat gained or lost through windows accounts for around 25-30% of residential energy use. Replacing your windows with energy-efficient models can help lower how much you have to pay, therefore saving you about 12% more on your bills.
Estimated Cost of Window Replacement in Walnut
Each window replacement company offers varying services and has varying costs depending on a few factors.
How Much Do New Windows Cost?
Typically, Walnut homeowners can expect their window replacements to range from $250 to $1,200. The average cost sits at approximately $600. How much it will cost depends on several factors, such as material, the location of your home, size, number of windows, type and more.
It’s important to note 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 Walnut homeowners $509+ a year when replacing single-pane windows.
How much your window installation costs will also vary based on the kind 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?
There are typically two types of window installation services: full-frame and pocket installations.
A full-frame installation is a replacement of the full window. This service involves removing the old window, the windowsill, and the exterior and interior trim. It can also involve other materials, like insulation and drip edges, which increase the overall cost of the project. Also worth noting: it’s not uncommon for homeowners to have to touch up the paint surrounding the window after a full-frame installation. A pocket installation involves installing a new window without replacing the frame. This means instead of taking out the whole window and rebuilding it, the contractor will just slide the replacement window (also called a retrofit or insert window) into the frame.
If you’re still trying to decide which kind of installation to get, you can consult with your installer and get their advice. The decision 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
- 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 Walnut
In our search to make your home improvements easier and more eco-friendly in Walnut, EcoWatch evaluated many companies before deciding on these. We’ve assessed the top window installation companies in Walnut primarily based on their energy efficient offerings, as the most sustainable option also benefits homeowners in many ways. 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
This one is pretty self-explanatory, but we’ve chosen to highlight window installation companies that serve a wide variety of states and cities so you can find a quality window installation company near you.
Work Quality
When picking new windows, the quality and range of services can often play just as important of a role in insulation and performance as the brand of window you choose. We do rate window installers higher if they offer high-quality products, but we also consider workmanship as reflected in customer feedback.
Customer Reviews
Customer feedback is another super important review factor. If most customers don’t have good feedback about their experience with a certain window installation company, you won’t see it featured on EcoWatch.
Cost
Cheaper windows don’t necessarily mean better windows, but we know many of our readers want to keep costs as low as possible. When analyzing the prices of providers, we gave higher scores to companies with reasonable prices and accessible financing rather than “cheaper” services.
Warranty
Protecting your investment in new windows is important to many homeowners. That’s why window installation companies that give you lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Because of Walnut’s climate, homeowners will want to mitigate rot, water damage and low efficiency. We factored in local experience to reflect the ability of Walnut window companies to prepare homes for the climate. If a company has less than 10 years of experience, it loses points in this category.
Walnut, CA Window Replacement FAQs
What is the average cost to install windows?
The national average cost of replacing one window is around $600 but can range from $200 to $1,200, depending on a few different factors. The price is usually 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.
Which kind of window should I get?
A window’s energy efficiency is influenced by a number of factors, such as the quality of the installation and what kind of window it is. Look for Energy Star Certified windows — these are often the most energy-efficient since they are certified by the U.S. Department of Energy.
When do I have to use a window installation company?
You should hire a window installation company whenever you want new windows. Installing windows is a complicated process that can take a lot of time, so it’s best handled by the professionals.
How long does window installation generally take?
Because the average installation time of a window is 30 minutes, around 16 windows can be installed in a typical 8-hour work day.