30 Best Window Replacement Companies in Killingworth, CT (2023 Reviews)
Window Companies Near Me
Are you thinking of upgrading your windows? Our guide to the top window installation companies can help you narrow down which one to choose.
We analyzed all the top window installers in Killingworth and selected the top 30 based on:
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Customer reviews
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Window replacement expertise
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Popularity with home-owners like you
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Updated March 14, 2023
Why you can trust EcoWatch
A guide on the best window replacement companies in Killingworth may not seem like the most captivating article on the EcoWatch site, but trust us, windows have more of an impact on your life than you might realize. Traditional or damaged windows can cost you in electricity bills. In fact, the Department of Energy estimates that about 30% of your house's heat or cool air could be lost through your windows.
Replacement windows improve the insulation in your home, not only making you and your family more comfortable during extreme temperatures, but also saving you money and helping the environment.
Efficient windows are particularly important in Killingworth, where the temperature varies throughout the year. According to Energy Star, switching to energy-efficient windows can save the average homeowner up to $403 a year.
Best Affordability
Window World
- Great industry reputation
- Lifetime warranty
- EnergyStar Partner
- Quality of service will depend on your area
Best Overall
Renewal by Andersen
- Member of US Green Building Council
- Great industry reputation
- Manufactures products in-house
- No lifetime warranty
Best for Businesses
Aeroseal Windows
- Custom Designs
- Great industry reputation
- Many years of experience
- Not ideal for residential installations
Best Window Replacement Companies in Killingworth
The EcoWatch Reviews team assessed many window installation companies across Killingworth to narrow our list down to the top ones. We assessed the installers on energy-efficient offerings, price, customer service, coverage area, local experience and more.

Window World
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Great industry reputation
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Lifetime warranty
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EnergyStar Partner
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Quality of service will depend on your area
Window World has windows expertise in Killingworth. Window World has been in the window installation industry for around 27 years. Its reputation is backed by all the positive reviews from customers online.
You may want to consider picking Window World if you're interested in 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 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 Killingworth?Window World does not display prices on its website, but it's known for offering some of the most affordable window installations around. You can request a free quote on its website for more information about pricing.

Renewal by Andersen
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Member of US Green Building Council
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Great industry reputation
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Manufactures products in-house
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No lifetime warranty
Renewal by Andersen has the best availability in Killingworth. This company has been in business since 1995 and currently provides services to nearly every state except Mississippi and West Virginia. The company has a lot of positive reviews from customers on online review websites.
Andersen may be the company for you if you're interested in one 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 want Energy Star windows when inquiring.
How much does Renewal by Andersen cost in Killingworth?Andersen doesn't have any prices available 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 more accurate pricing information, you can request a quote on the company's website.

Aeroseal Windows
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Custom Designs
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Great industry reputation
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Many years of experience
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Not ideal for residential installations
Aeroseal Windows provides the best window installation for businesses in Killingworth. Aeroseal has around 23 years of experience in the window replacement sector.
Aeroseal may be the company for you if you're interested in one that installs windows and doors at businesses across the Eastern U.S.
Energy Efficiency of Aeroseal Windows WindowsAeroseal Windows is an Energy Star partner and has a variety of energy-efficient windows. Note that not all of the company's windows are Energy Star certified, so be sure to ask your Aeroseal representative when inquiring about services.
How much does Aeroseal Windows cost in Killingworth?While prices are not readily available on Aeroseal's website, it provides high-quality windows at a competitive price point. For more detailed information on pricing, you can receive a quote from the company.

Window Nation
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Award-winning company
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Manufactures products in-house
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Custom designs
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Wide variety of products and services
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Installation not covered by warranty
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Limited service area
Window Nation provides the best residential windows in Killingworth. It's a company that serves hundreds of thousands of homeowners, mostly in the mid-Atlantic region of the U.S. Window Nation has been in the window industry for about 16 years. The provider has many glowing reviews from customers on online review websites.
You may want to consider choosing Window Nation if you're interested in a company that gives customers the opportunity to view products and to speak to a representative in person in its showrooms.
Energy Efficiency of Window Nation WindowsWindow Nation's commitment to sustainability shows in its energy-efficient window offerings. Each product has windowpanes coated with a Low-E (low emissivity) glaze that prevents damaging UV rays from heating your home. Plus, the spaces between double- and triple-pane windows are filled with argon gas that’s been proven to improve home insulation.
How much does Window Nation cost in Killingworth?Pricing details are not available on Window Nation's website since the cost of window installment varies greatly based on how many and what type(s) of windows you need. However, based on customer feedback, you can expect to pay between $300 and $525 per window installed, making it a more affordable option compared to competitors. The best way to get more accurate pricing information is to receive a free quote from the company.
One thing to note is that the companies in this section are national, which means the quality of customer service may depend on your local team. We have tried to remain unbiased and transparent by including both pros and cons for every company.
More Window Replacement Companies in Killingworth
Renewal by Andersen - Branford
Branford, CT-
Consistent Workmanship
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Good Customer Service
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No-fee Quotes
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Locally Recognized for Quality
Services Offered
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Residential Windows
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Custom Window Designs
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Business Windows
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Double-Hung
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Stained Glass
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Sliding Glass
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Bay Windows
TL Home Improvement LLC
Shelton, CT-
Free Quotes
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Excellent Customer Service
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No-Hassle Pricing
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Educational Website
Services Offered
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Residential Windows
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Fast Delivery
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Energy-Efficient Options
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Custom Window Designs
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Aluminum Window Frames
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Full-Service Installations
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Double-Hung
Nu-Face Home Improvements
Plantsville, CT-
Arrives on Time
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Dependable Service
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Educational Website
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No-Hassle Pricing
Services Offered
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Residential Windows
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Glass Showers
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Energy-Efficient Options
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Custom Windows
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Double-Hung
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Sliding Glass
Advanced Window Systems LLC
Cromwell, CT-
Good Customer Service
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No-fee Quotes
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Price Transparency
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Arrives on Time
Services Offered
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Glass Showers
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Energy-Efficient Options
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Custom Window Designs
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Double-Hung
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Sliding Glass
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Bay Windows
North Shore Window Inc.
Bridgehampton, NY-
Excellent Customer Service
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Award-Winning
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Educational Website
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No-Hassle Pricing
Services Offered
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Residential Windows
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Architectural Glass
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Fast Delivery
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Custom Windows
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Aluminum Window Frames
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Double-Hung
Eastern Glass & Shower Door
Milford, CT-
Excellent Customer Service
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Free Quotes
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Price Transparency
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Helps Educate Customers
Services Offered
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Doors
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Full-Service Installations
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Custom Window Designs
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Tempered Glass
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Residential Windows
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Business Windows
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Aluminum Window Frames
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Sliding Glass
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Glass Showers
Mainville Windows & Doors
Newington, CT-
Dependable Service
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No-Hassle Pricing
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Good Customer Service
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Helps Educate Customers
Services Offered
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Residential Windows
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Custom Window Designs
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Aluminum Window Frames
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Commercial Windows
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Double-Hung
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Sliding Glass
United Glass & Mirror Co
Bozrah, CT-
Price Transparency
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Educational Website
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Good Customer Service
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Locally Recognized for Quality
Services Offered
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Residential Windows
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Architectural Glass
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Glass Showers
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Heavy Glass
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Tempered Glass
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Doors
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Custom Windows
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Commercial Windows
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Sliding Glass
Window World of Hartford
Manchester, CT-
No-Hassle Pricing
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Educational Website
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Reliable Service
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Excellent Customer Service
Services Offered
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Custom Window Designs
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Fast Delivery
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Sliding Glass
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Double-Hung
V. Nanfito Roofing & Siding
Meriden, CT-
Dependable Service
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No-fee Quotes
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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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Commercial Windows
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Full-Service Installations
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Custom Windows
Mr. Handyman of Norwich, New London and Glastonbury
Norwich, CT-
Price Transparency
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Locally Recognized for Quality
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Good Customer Service
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Educational Website
Services Offered
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Custom Window Designs
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Residential Windows
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Commercial Windows
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Double-Hung
Mr. Handyman of Guilford, North and East Haven
East Haven, CT-
No-Hassle Pricing
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Dependable Service
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Excellent Customer Service
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Free Quotes
Services Offered
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Custom Windows
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Residential Windows
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Commercial Windows
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Double-Hung
Turner Home Improvement Contractors, LLC,
Glastonbury, CT-
Free Quotes
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Price Transparency
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Helps Educate Customers
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Arrives on Time
Services Offered
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Residential Windows
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Business Windows
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Full-Service Installations
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Custom Windows
Lowe's Home Improvement
Riverhead, NY-
Educational Website
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No-Hassle Pricing
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Good Customer Service
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No-fee Quotes
Services Offered
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Energy-Efficient Options
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Custom Windows
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Aluminum Window Frames
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Double-Hung
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Sliding Glass
Capitol Glass Co Inc
West Hartford, CT-
Price Transparency
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No-fee Quotes
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Excellent Customer Service
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Helps Educate Customers
Services Offered
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Residential Windows
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Architectural Glass
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Doors
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Custom Windows
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Aluminum Window Frames
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Full-Service Installations
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Commercial Windows
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Sliding Glass
Clinton Glass
Clinton, CT-
No-Hassle Pricing
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Good Customer Service
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Helps Educate Customers
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No-fee Quotes
Services Offered
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Residential Windows
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Glass Showers
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Fast Delivery
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Custom Windows
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Commercial Windows
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Sliding Glass
Plymouth Glass & Mirror, Inc.
Thomaston, CT-
Good Customer Service
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Locally Recognized for Quality
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Price Transparency
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Helps Educate Customers
Services Offered
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Glass Showers
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Residential Windows
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Architectural Glass
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Doors
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Custom Windows
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Commercial Windows
Villwell Builders, LLC
Waterbury, CT-
Excellent Customer Service
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Helps Educate Customers
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Consistent Workmanship
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Locally Recognized for Quality
Services Offered
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Custom Windows
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Residential Windows
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Business Windows
Thomas Garbati Builders, LLC
Waterford, CT-
Excellent Customer Service
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Price Transparency
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Helps Educate Customers
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No-fee Quotes
Services Offered
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Custom Window Designs
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Residential Windows
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Double-Hung
Renewal by Andersen Windows Connecticut
Cromwell, CT-
Reliable Service
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Excellent Customer Service
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Price Transparency
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Free Quotes
Services Offered
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Energy-Efficient Options
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Custom Windows
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Aluminum Window Frames
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Full-Service Installations
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Double-Hung
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Sliding Glass
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Bay & Bow Windows
Wallingford Glass
Wallingford, CT-
Reliable Service
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Excellent Customer Service
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Free Quotes
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Price Transparency
Services Offered
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Residential Windows
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Tempered Glass
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Doors
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Custom Window Designs
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Commercial Windows
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Double-Hung
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Stained Glass
Ring's End
Madison, CT-
Excellent Customer Service
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No-Hassle Pricing
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No-fee Quotes
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Helps Educate Customers
Services Offered
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Double-Hung
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Full-Service Installations
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Custom Windows
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Commercial Windows
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Aluminum Window Frames
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Architectural Glass
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Fast Delivery
Ring's End
Branford, CT-
No-fee Quotes
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No-Hassle Pricing
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Good Customer Service
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Helps Educate Customers
Services Offered
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Double-Hung
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Full-Service Installations
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Custom Windows
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Business Windows
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Aluminum Window Frames
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Architectural Glass
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Fast Delivery
Cussons Sash
Glastonbury, CT-
Price Transparency
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Free Quotes
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Excellent Customer Service
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Gives to charity
Services Offered
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Custom Windows
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Residential Windows
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Business Windows
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Sliding Glass
Fiderio & Sons
Meriden, CT-
No-fee Quotes
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Arrives on Time
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Price Transparency
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Helps Educate Customers
Services Offered
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Custom Windows
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Aluminum Window Frames
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Full-Service Installations
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Double-Hung
J C Tonnotti Window Co
Southington, CT-
Consistent Workmanship
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No-fee Quotes
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Good Customer Service
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Educational Website
Services Offered
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Custom Windows
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Aluminum Window Frames
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Sliding Glass
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Double-Hung
Window Nation
Wallingford, CT-
Excellent Customer Service
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Award-Winning
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Helps Educate Customers
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Dependable Service
Services Offered
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Sliding Glass
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Custom Windows
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Energy-Efficient Options
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Double-Hung
Pella Windows & Doors of Monroe
Monroe, CT-
Award-Winning
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Helps Educate Customers
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Excellent Customer Service
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No-Hassle Pricing
Services Offered
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Residential Windows
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Custom Windows
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Commercial Windows
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Double-Hung
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Sliding Glass
A Plus Exterior LLC
Milford, CT-
Good Customer Service
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Arrives on Time
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Award-Winning
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Price Transparency
Services Offered
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Custom Window Designs
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Sliding Glass
AA Glass Inc
Bloomfield, CT-
Free Quotes
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Excellent Customer Service
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No-Hassle Pricing
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Reliable Service
Services Offered
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Glass Showers
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Residential Windows
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Custom Window Designs
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Commercial Windows
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Sliding Glass
How Installing Energy-Efficient Windows in Killingworth Saves You Money
Energy-efficient windows can benefit you in several ways. Here are some reasons you may want to make the switch:
- Protect your investment: If you have a relatively old home, your windows are most likely outdated. Updating your windows can improve the insulation in your home and also help increase the value of your house if you decide to sell.
- Protect your valuables: The low-emissivity coatings on many Energy Star certified windows help prevent damage from the sun's UV rays to your floors, carpets and furniture.
- Save on power bills: Switching to energy-efficient windows lowers your energy bills by about 12% since you use less energy.
- Reduce your carbon footprint: By using less energy after switching to energy-efficient windows, you'll also be lowering your indirect greenhouse gas emissions by about 12%, according to Energy Star.
Estimated Cost of Window Replacement in Killingworth
Windows come in different purposes, shapes and styles, so costs and services will differ greatly based on your project. Below, we detail the typical cost and services that you can get from window installation companies.
How Much Do New Windows Cost?
According to our market research, the typical cost to replace a single window is about $600. However, window installation costs can range from $200 to $1,200 a window. Costs will differ significantly depending on your location, the quality of your products, the current condition of your home and the number of windows you need. A lot of window companies also offer replacement door installations and other add-ons like baths, coating, shutters and more. Additional services will increase your overall project costs.
It's also worth bearing in mind that energy-efficient windows will usually cost more upfront, but Energy Star predicts that switching out the windows on your Killingworth home translates to 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 depends on your local climate, energy rates and other factors unique to your home.
Costs will also vary based on the material of your frame. Aluminum frames are the least expensive. They're sturdy, light and maintenance-free, but offer poor insulation. Vinyl frames are somewhat expensive and offer good insulation. Composite frames made with wood fibers encased in plastic also offer good insulation and are moderately expensive. Wood frames cost the most and are the most in-demand. They're also aesthetically pleasing and offer decent insulation for your home.
What Services do Window Installers Offer?
The first step of a window replacement is to figure out whether you want a full-frame or pocket installation.
Full-frame installations involve replacing the complete window, including the frame, sill and trim. You most likely need a full-frame installation when you want to change the style of your windows or your window has significant damage or rot. Full-frame installations are more involved and will increase overall costs. Pocket installations (or retrofits) involve replacing a window within the existing frame, which makes pocket installations take less time and therefore cost less. But, if the frame has any rot or deterioration, you will most likely need a full-frame installation instead.
Your window replacement company will be able to help you figure out what's best for your needs. In Killingworth, the decision will mostly depend on how old your windows are and if there's any moisture damage. Wood can decay if not maintained properly over the years, so it's good to have a professional examine your frames and window sills.
Best Affordability
Window World
- Great industry reputation
- Lifetime warranty
- EnergyStar Partner
- Quality of service will depend on your area
Best Overall
Renewal by Andersen
- Member of US Green Building Council
- Great industry reputation
- Manufactures products in-house
- No lifetime warranty
Best for Businesses
Aeroseal Windows
- Custom Designs
- Great industry reputation
- Many years of experience
- Not ideal for residential installations
How We Choose the Best Window Installers in Killingworth
In our search to make your home improvements easier and more eco-friendly in Killingworth, EcoWatch assessed many companies before landing on these. Along with energy efficiency, we reviewed several window installers in Killingworth and ranked them using the following methodology:
Service Area
Since this is a guide for Killingworth, we gave more points to companies that provide services to the city. There are certainly reputable providers that didn't make the list because they wouldn't be able to serve homeowners in Killingworth.
Work Quality
When installing new windows, the quality and variety of services often plays just as important of a role in overall efficiency and performance as the brand you get. 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
Customer feedback is another super important review factor. If most customers don't have good feedback about their service from a certain company, it won't be featured on EcoWatch.
Cost
This one is a give-and-take: similar to other services, cheap window installation companies are not going to provide the most quality service. On the other hand, we want to ensure we're highlighting companies that offer a variety of price and financing options so they're accessible to most homeowners.
Warranty
As discussed previously, windows are a sizable investment, so you'll want to make sure that investment is well protected. Window installation companies that offer lengthy warranties for products, parts and installation (aka workmanship) rank higher with EcoWatch.
Years of Experience
Last but not least, we like to see companies that have been in the industry for a while. Window installers that have more years of experience will earn higher rankings by our standards. We like to see at least ten years of experience.
Killingworth, CT Window Replacement FAQs
How much does a window install cost?
The national average cost of installing a single window is about $600 but can range between $200 and $1,200, based on a variety of factors. The price is often dependent on the size of the window, the type and material of the window and the location of your property. Also, remember that energy-efficient windows may cost more initially but can save you hundreds of dollars a year in energy bills.
What are the most common kinds of replacement windows?
The most common types of windows for homes are picture windows, awning windows, casement windows, transom windows, slider windows, bay windows and double-hung and single-hung windows.
When should I use a window installation company?
Unless you have experience with home improvement projects and have the time needed to replace your own windows, we recommend hiring a professional installer. The window installation process is complicated and can take anywhere from four to six hours for a single window. Although it's tempting to try to do it yourself to save money, hiring a company is a faster, more efficient and much safer alternative.
What time of year should I replace my windows?
Replacement windows can be installed any time of the year, but warmer weather is typically better. No matter when you install them, the contractors will take steps to make sure that too much hot or cold air doesn't get into your house, so the temperature outside doesn't necessarily matter that much. What's most important is that the weather should be dry.
How often should you replace windows?
Windows usually have a lifespan of around 20 to 30 years, but anytime you see damage on your windows, it's a good time to have them looked at by an expert to determine if they need any repairs or replacements.