24 Best Window Replacement Companies in Castro Valley, CA (Feb 2023)
Window Companies Near Me

Are you thinking of upgrading your windows? Our guide to the top window installation companies can help you pick the right one for you.

We analyzed all the top window installers in Castro Valley and selected the top 24 based on:

  • Customer reviews
  • Window replacement expertise
  • Popularity with home-owners like you
EcoWatch Local Advisors

By EcoWatch Local Advisors

Updated January 12, 2023

Why you can trust EcoWatch

Our panel of energy experts work tirelessly to create unbiased reviews and informative content to help homeowners make educated decisions. No other windows site has covered energy efficiency and sustainability as long as EcoWatch, which means we're going to help you find windows replacements that will save on your energy bill and put more money back in your wallet.

Although eco-friendly energy sources like wind and solar are important when it comes to reducing your carbon footprint, improving your home's energy efficiency can also have a considerable impact on home energy conservation. Traditional or damaged windows could lead to having higher energy bills during the winter or summer months.

That's also bad for the environment because the extra energy required by drafty windows increases your carbon footprint.

We've made this list of the top installation companies to help you in your research, so you can not only enjoy brand new windows, but also save money on your energy bills.

Best Overall

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Award-winning company
  • Manufactures products in-house
  • More expensive than competition

Excellent Reputation

Milgard Windows & Doors

★★★★★
4.5

  • EnergyStar Partner
  • Wide network of installers
  • Lifetime warranty available
  • Entails hiring third-party contractors

Best Affordability

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Low prices relative to competitors
  • Large serice area
  • Quality of service will depend on your area

Best Window Replacement Companies in Castro Valley

The EcoWatch Reviews team assessed many installers in Castro Valley to find the best ones for our readers. The providers we've included in this article scored best in our categories: energy-efficient offerings, customer service, price, availability and more.

Renewal by Andersen logo
FAST QUOTE
as little as 30 seconds
Best Overall

Renewal by Andersen

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon Great industry reputation
  • Pros icon Award-winning company
  • Pros icon Manufactures products in-house
Cons:
  • Pros icon More expensive than competition

Renewal by Andersen offers the best availability in Castro Valley. This company has been in business since 1995 and currently provides services to nearly every state except Mississippi and West Virginia. Hundreds of positive reviews on customer review websites back the provider's reputation.

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, Andersen may be the provider for you.

Energy Efficiency of Renewal by Andersen Windows

Renewal by Andersen carries some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to ask for 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 Castro 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. The best way to know for sure is to get a free quote from the company.

Milgard Windows & Doors logo
FAST QUOTE
as little as 30 seconds
Excellent Reputation

Milgard Windows & Doors

★★★★★
BBB Rating: A
Locations: West Coast
Founded: 1962
Pros:
  • Pros icon EnergyStar Partner
  • Pros icon Wide network of installers
  • Pros icon Lifetime warranty available
Cons:
  • Pros icon Entails hiring third-party contractors

Milgard Windows & Doors provides the best local installation in Castro Valley. 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 a lot of glowing reviews from customers online.

You may want to consider choosing 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 Windows

There are a wide variety 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 Castro Valley?

Milgard doesn't have any pricing information available on its website, but 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.

Window World logo
FAST QUOTE
as little as 30 seconds
Best Affordability

Window World

★★★★★
BBB Rating: A+
Locations: Nationwide
Founded: 1995
Pros:
  • Pros icon EnergyStar Partner
  • Pros icon Low prices relative to competitors
  • Pros icon Large serice area
Cons:
  • Pros icon Quality of service will depend on your area

Window World has windows expertise in Castro Valley. It's the largest window replacement company in the country, known for its vinyl windows and affordability. This company has been operating since 1995 and currently services 200 locations nationwide. The provider has hundreds of glowing reviews from customers on online review websites.

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, this may be the perfect provider for you.

Energy Efficiency of Window World Windows

Window World caters to eco-conscious consumers by providing 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 Castro Valley?

Window World doesn't have any prices listed on its website, but it's known for offering some of the most affordable window installations around. If you'd like more accurate information, you can request a quote on the company's website.

Universal Windows Direct logo
FAST QUOTE
as little as 30 seconds
Best Warranty

Universal Windows Direct

★★★★★
BBB Rating: A
Locations: Nationwide
Founded: 2002
Pros:
  • Pros icon Makes charitable contributions
  • Pros icon Manufactures products in-house
  • Pros icon Wide variety of products and services
  • Pros icon Lifetime warranty
Cons:
  • Pros icon Limited service area
  • Pros icon Some installations carried out by third-party contractors
  • Pros icon Quality of service will depend on your area

Universal Windows Direct is a company that has grown immensely since its inception in 2002, and now has several franchise dealers nationwide. This provider has 20 years of experience in the windows business, and it has proved to be one of the best companies in the business.

Universal may be the company for you if you're interested in one that has an industry-leading warranty covering products, parts and workmanship for life.

Energy Efficiency of Universal Windows Direct Windows

The 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'd like Energy Star windows when inquiring.

How much does Universal Windows Direct cost in Castro Valley?

Prices aren't available on Universal's website, but 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. The best way to know for sure is to get a free quote from the company.

We have tried to stay unbiased and transparent by including pros and cons for every provider. Additionally, any partnerships do not affect our rankings.

More Window Replacement Companies in Castro Valley

The Glass Guru

Antioch, CA
4.4
★★★★★
  • Pros icon Free Quotes
  • Pros icon Good Customer Service
  • Pros icon Locally Recognized for Quality
  • Pros icon Consistent Workmanship

Services Offered

  • Service icon Glass Showers
  • Service icon Tempered Glass
  • Service icon Custom Window Designs
  • Service icon Aluminum Window Frames
  • Service icon Full-Service Installations
  • Service icon Commercial Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: https://www.theglassguru.com/brentwood-ca/
Address: 2220 A St Suite A, Antioch, CA 94509
Phone: (925) 690-1947

Renewal by Andersen of San Francisco

Hayward, CA
4.3
★★★★★
  • Pros icon Free Quotes
  • Pros icon Excellent Customer Service
  • Pros icon Consistent Workmanship
  • Pros icon Educational Website

Services Offered

  • Service icon Custom Window Designs
  • Service icon Business Windows
  • Service icon Double-Hung
  • Service icon Stained Glass
  • Service icon Sliding Glass
  • Service icon Bay Windows

Website: https://www.renewalbyandersen.com/window-company/890-san-francisco-ca/retailer
Address: 30806 Santana St, Hayward, CA 94544
Phone: (510) 803-3110

Quality First Home Improvement, Inc.

Campbell, CA
4.3
★★★★★
  • Pros icon Price Transparency
  • Pros icon Educational Website
  • Pros icon Excellent Customer Service
  • Pros icon No-fee Quotes

Services Offered

  • Service icon Residential Windows
  • Service icon Glass Showers
  • Service icon Energy-Efficient Options
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: https://www.qualityfirsthome.com/locations/california/san-jose-ca/
Address: 485 Salmar Ave, Campbell, CA 95008
Phone: (800) 859-7494

Global Glass Enterprise Inc.

San Jose, CA
4.3
★★★★★
  • Pros icon No-Hassle Pricing
  • Pros icon Free Quotes
  • Pros icon Educational Website
  • Pros icon Excellent Customer Service

Services Offered

  • Service icon Residential Windows
  • Service icon Architectural Glass
  • Service icon Energy-Efficient Options
  • Service icon Tempered Glass
  • Service icon Custom Window Designs
  • Service icon Aluminum Window Frames
  • Service icon Business Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: http://www.goglobalglass.com/
Address: 14768 Ronda Dr, San Jose, CA 95124
Phone: (408) 799-3715

Window Replacement San Leandro

San Leandro, CA
4.0
★★★★★
  • Pros icon Price Transparency
  • Pros icon Arrives on Time
  • Pros icon Good Customer Service
  • Pros icon No-fee Quotes

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 1300 Fairmont Dr, San Leandro, CA 94578
Phone: (510) 722-0016

Best Exteriors

San Leandro, CA
4.0
★★★★★
  • Pros icon No-fee Quotes
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon Arrives on Time

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 689 E 14th St, San Leandro, CA 94577
Phone: (510) 961-3697

Window Replacement Berkeley

Berkeley, CA
4.0
★★★★★
  • Pros icon Free Quotes
  • Pros icon Dependable Service
  • Pros icon Helps Educate Customers
  • Pros icon Price Transparency

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 909 University Ave, Berkeley, CA 94710
Phone: (510) 722-0025

Best Exteriors

Oakland, CA
4.0
★★★★★
  • Pros icon Excellent Customer Service
  • Pros icon Free Quotes
  • Pros icon Reliable Appointment Windows
  • Pros icon Educational Website

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay Windows

Website: https://bestexteriors.com/
Address: 1999 Harrison St #10219, Oakland, CA 94612
Phone: (877) 792-6065

Window Replacement Vallejo

Vallejo, CA
4.0
★★★★★
  • Pros icon No-Hassle Pricing
  • Pros icon Dependable Service
  • Pros icon No-fee Quotes
  • Pros icon Good Customer Service

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 116 Springstowne Center, Vallejo, CA 94591
Phone: (707) 515-0257

Window Replacement Dublin

Dublin, CA
4.0
★★★★★
  • Pros icon No-fee Quotes
  • Pros icon Reliable Appointment Windows
  • Pros icon Reliable Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 4530 Dublin Blvd, Dublin, CA 94568
Phone: (925) 587-4767

Window Replacement Livermore

Livermore, CA
4.0
★★★★★
  • Pros icon Consistent Workmanship
  • Pros icon Timely Service
  • Pros icon No-Hassle Pricing
  • Pros icon No-fee Quotes

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 1374 Railroad Ave, Livermore, CA 94550
Phone: (925) 495-1522

Window Replacement Pleasanton

Pleasanton, CA
4.0
★★★★★
  • Pros icon Consistent Workmanship
  • Pros icon Reliable Appointment Windows
  • Pros icon No-Hassle Pricing
  • Pros icon Good Customer Service

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay Windows

Website: https://bestexteriors.com/
Address: Pleasanton Ave, Pleasanton, CA 94566
Phone: (925) 400-8953

Window Replacement San Francisco

San Francisco, CA
4.0
★★★★★
  • Pros icon Helps Educate Customers
  • Pros icon Free Quotes
  • Pros icon No-Hassle Pricing
  • Pros icon Excellent Customer Service

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 1597 Sanchez St, San Francisco, CA 94131
Phone: (650) 402-1162

Window Replacement Oakland

Oakland, CA
4.0
★★★★★
  • Pros icon Dependable Service
  • Pros icon No-fee Quotes
  • Pros icon Helps Educate Customers
  • Pros icon Excellent Customer Service

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay Windows

Website: https://bestexteriors.com/
Address: 1722 Broadway, Oakland, CA 94612
Phone: (510) 722-0008

Window Replacement Alameda

Alameda, CA
4.0
★★★★★
  • Pros icon Educational Website
  • Pros icon Price Transparency
  • Pros icon Reliable Service
  • Pros icon Free Quotes

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 555 Ralph A Memorial Pkwy, Alameda, CA 94501
Phone: (510) 722-0010

Window Replacement Redwood City

Pleasanton, CA
4.0
★★★★★
  • Pros icon Free Quotes
  • Pros icon Reliable Appointment Windows
  • Pros icon Excellent Customer Service
  • Pros icon No-Hassle Pricing

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 649 Main St, Pleasanton, CA 94566
Phone: (650) 569-1968

Roxy Glass

Morton Ave, CA
4.0
★★★★★
  • Pros icon Educational Website
  • Pros icon Good Customer Service
  • Pros icon No-fee Quotes
  • Pros icon Price Transparency

Services Offered

  • Service icon Residential Windows
  • Service icon Glass Showers
  • Service icon Energy-Efficient Options
  • Service icon Tempered Glass
  • Service icon Custom Window Designs
  • Service icon Aluminum Window Frames
  • Service icon Business Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass

Website: https://bayareawindowglass.com/
Address: 7401-A, Morton Ave, Newark, CA 94560
Phone: (510) 400-7788

Window Replacement Fremont

Fremont, CA
4.0
★★★★★
  • Pros icon Helps Educate Customers
  • Pros icon Price Transparency
  • Pros icon Timely Service
  • Pros icon Excellent Customer Service

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 43713 Boscell Rd, Fremont, CA 94538
Phone: (510) 722-0717

Window Replacement Walnut Creek

Walnut Creek, CA
4.0
★★★★★
  • Pros icon Reliable Appointment Windows
  • Pros icon Helps Educate Customers
  • Pros icon Consistent Workmanship
  • Pros icon No-fee Quotes

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay Windows

Website: https://bestexteriors.com/
Address: 2842 Ygnacio Valley Rd, Walnut Creek, CA 94598
Phone: (925) 464-1334

Window Replacement Concord

Concord, CA
4.0
★★★★★
  • Pros icon Dependable Service
  • Pros icon Free Quotes
  • Pros icon Reliable Appointment Windows
  • Pros icon No-Hassle Pricing

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 1856 Colfax St, Concord, CA 94520
Phone: (925) 466-4343

Window Replacement Union City

Union City, CA
4.0
★★★★★
  • Pros icon Educational Website
  • Pros icon Reliable Appointment Windows
  • Pros icon No-fee Quotes
  • Pros icon Good Customer Service

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay & Bow Windows

Website: https://bestexteriors.com/
Address: 4126 Dyer St, Union City, CA 94587
Phone: (510) 722-0020

Window Replacement San Mateo

San Mateo, CA
4.0
★★★★★
  • Pros icon Educational Website
  • Pros icon No-fee Quotes
  • Pros icon Consistent Workmanship
  • Pros icon No-Hassle Pricing

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay Windows

Website: https://bestexteriors.com/
Address: 514 S Norfolk St, San Mateo, CA 94401
Phone: (650) 356-8663

Best Exteriors

Oakland, CA
4.0
★★★★★
  • Pros icon Reliable Service
  • Pros icon No-fee Quotes
  • Pros icon Good Customer Service
  • Pros icon Price Transparency

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Windows
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay Windows

Website: https://bestexteriors.com/
Address: 1301 E 31st St, Oakland, CA 94602
Phone: (510) 961-3175

Window Replacement Hayward

Hayward, CA
4.0
★★★★★
  • Pros icon Educational Website
  • Pros icon Excellent Customer Service
  • Pros icon Timely Service
  • Pros icon Free Quotes

Services Offered

  • Service icon Architectural Glass
  • Service icon Fast Delivery
  • Service icon Custom Window Designs
  • Service icon Double-Hung
  • Service icon Sliding Glass
  • Service icon Bay Windows

Website: https://bestexteriors.com/
Address: 27531 Tampa Ave, Hayward, CA 94544
Phone: (510) 606-4707

How Installing Energy-Efficient Windows in Castro Valley Saves You Money

Switching to energy-efficient windows can help improve the comfort of your home and help you save on electricity bills. Here are more ways switching out your windows could help you:

  • Protect your investment: Upgrading and repairing your windows is an important part of maintaining your property and its value, particularly if your home is on the older side.
  • Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which filter out damaging UV rays, reducing fading of your furniture, carpet and other valuables.
  • Save on energy bills: Installing energy-efficient windows lowers your energy bills by about 12% since you need less energy.
  • Decrease your carbon footprint: Since energy-efficient windows improve the insulation in your home, you can cut your indirect greenhouse gas emissions by about 12%, according to Energy Star.

Estimated Cost of Window Replacement in Castro Valley

When considering window installation, each company offers different services and prices. Let's look at some average costs and services.

How Much Do New Windows Cost?

The typical cost to install one window is about $600 but can range from $200 to $1,200. But prices vary remarkably depending on the size of your home, complexity of the installation, your location and the quality of the company you choose. Many window installers also offer door installations, which have a higher price tag.

It's also worth noting that energy-efficient windows will typically cost more initially, but Energy Star predicts that upgrading the windows on your Castro Valley home translates to an average energy savings of $236 to $319 per year for single-pane window replacement, or between $87 to $126 per 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.

How much your window installation costs will also vary depending on the type of window material you choose for the frames. Wood windows are usually the most expensive, though it depends if 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?

The first step when considering a window installation is to figure out 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 a new style for your windows or when it has a great amount of deterioration. Full-frame installations are more time-consuming and will increase overall costs. Pocket installations are simpler and won't cost as much, as they entail merely replacing the window within its existing frame. But if the frame has any damage or deterioration, you should opt for a full-frame installation instead.

Your window installation company can help you decide which type of installation you need.

Best Overall

Renewal by Andersen

★★★★★
4.5

  • Great industry reputation
  • Award-winning company
  • Manufactures products in-house
  • More expensive than competition

Excellent Reputation

Milgard Windows & Doors

★★★★★
4.5

  • EnergyStar Partner
  • Wide network of installers
  • Lifetime warranty available
  • Entails hiring third-party contractors

Best Affordability

Window World

★★★★★
4.5

  • EnergyStar Partner
  • Low prices relative to competitors
  • Large serice area
  • Quality of service will depend on your area

How We Choose the Best Window Installers in Castro Valley

In our search to find the most reliable, eco-friendly window installers in Castro Valley, the EcoWatch Reviews team evaluated dozens of companies before deciding on these. Along with energy efficiency, we assessed each installer and assigned rankings based on the following methodology:

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

We're willing to bet that you're looking for a company to do a great job installing windows. We've vetted each company featured in our guide to ensure its technicians are well-qualified and that the company has gotten tons of positive customer feedback to vouch for its service.

Customer Reviews

Another self-explanatory yet super important review factor is customer feedback. If most customers don't have good things to say about their service from a certain company, it won't be featured on EcoWatch.

Cost

This one is a give-and-take: similar to most services, cheap window companies may not provide the most quality service. Still, we want to ensure we're highlighting companies that provide a variety of price and financing options so they're accessible to most homeowners.

Warranty

Protecting your investment in new windows is important to many homeowners. For that reason, window installation companies with lengthy warranties for products, parts and labor rank higher with EcoWatch.

Years of Experience

Due to Castro Valley's climate, homeowners will want to mitigate rot, low efficiency and water damage. We factored in local experience to reflect the ability of Castro Valley window companies to prepare homes for the climate. If a company has less than 10 years of experience, it loses points in this category.

Castro Valley, CA Window Replacement FAQs

How much does a window install cost?

The national average cost to install a window is around $600 but can range from $200 to $1,200, based on several factors. The price is often dependent on the location of your property, the size of the window and the type and material of the window. Also, remember 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 is the best?

Generally, double-pane windows will be more efficient than single-pane windows and windows that don't open are more efficient than windows that do. To be sure you're getting the most energy-efficient windows, look for models that have the blue Energy Star certification — that means they're certified energy-efficient by the U.S. Department of Energy.

Can I replace my own windows?

If you're handy and have experience with similar home improvement projects, it's possible to install your own windows. But if you don't have the time or skills, we recommend hiring a professional.

How long does it typically take to install windows?

Because a window takes about 30 minutes to install, around 16 windows can be installed during an 8-hour work day.

Should I replace my windows all at the same time?

If you want to get more efficient windows and save money on energy costs, replacing all the windows together is the only way to gain that benefit. On the other hand, if you have just one or two windows that are damaged or leaky, you can replace just those.

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