20 Best Window Companies in Darien, CT (2025 Reviews)
Thinking about upgrading your windows? We’ve got you covered in this guide to the top window installation companies.
We analyzed all the top-rated window companies in Darien and selected the best 20 based on:
Customer reviews
Window installation expertise
Popularity with home-owners like you
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Why you can trust EcoWatch
A review of the top window installation companies in Darien may not seem like the most compelling article on the EcoWatch site, but trust us, windows impact your life more than you might think. When it’s the middle of winter, your outdated and drafty windows could be making your home more difficult to heat and costing you more in power bills.
Fortunately, saving you energy with upgraded windows also aligns with our goals of conserving energy and the resources it takes to make it.
We’ve compiled this list of the top installation companies to help you in your search, so you can not only benefit from 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 Darien
The EcoWatch team researched dozens of window companies in Darien to find the best ones for our readers. The companies mentioned in this article passed our review standards for energy-efficient offerings as well as price, customer service, local expertise and beyond.

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 is the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has over 27 years of experience in the windows industry, and it currently serves 200 locations nationwide. The company has a lot of positive 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, Window World may be the right company for you.
Energy Efficiency of Window World WindowsWindow World’s commitment to sustainability can be seen in its 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 Darien?Pricing information is not available on Window World’s website, as the cost of window installment 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. For more detailed information on the cost, you can request a quote from the company.

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 is a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has over 27 years of experience in the windows industry, and it currently serves nearly every state except Mississippi and West Virginia. The company has a lot of positive reviews from customers on online review websites.
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 right company for you.
Energy Efficiency of Renewal by Andersen WindowsRenewal by Andersen’s commitment to sustainability can be seen in its energy-efficient window offerings. 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 Darien?Pricing information is not available on Andersen’s website, as the cost of window installment 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. For more detailed information on the cost, you can request a quote from the company.

Aeroseal Windows
Many years of experience
Great industry reputation
Low number of customer complaints
Manufactures products in-house
Custom Designs
No lifetime warranty
Not ideal for residential installations
Aeroseal Windows is an installer that mainly serves commercial and multifamily properties, and also specializes in railings. If you’re looking for residential window installations, you should probably refer to one of the other companies on this list. Aeroseal has over 23 years of experience in the windows industry, and it currently serves 13 states and Washington D.C. The company has a lot of positive reviews from customers on online review websites.
If you’re looking for a company that installs windows and doors at businesses across the Eastern U.S, Aeroseal may be the right company for you.
Energy Efficiency of Aeroseal Windows WindowsAeroseal Windows’s commitment to sustainability can be seen in its energy-efficient window offerings. The company claims it helps businesses save on energy expenses and reduce their carbon footprints with energy-efficient windows, as well as practices like Low-E glass coating, weatherstripping and more.
How much does Aeroseal Windows cost in Darien?Pricing information is not available on Aeroseal’s website, as the cost of window installment differs based on how many and what type(s) of windows you need. However, it provides high-quality windows at a competitive price point. For more detailed information on the cost, you can request a quote from the company.

Window Nation
Award-winning company
Manufactures products in-house
Custom designs
Wide variety of products and services
Installation not covered by warranty
Limited service area
Window Nation is a company that serves hundreds of thousands of homeowners, mostly in the mid-Atlantic region of the U.S. Window Nation has over 16 years of experience in the windows industry, and it currently serves residents within 75 miles of its showrooms, which are in 13 states. The company has a lot of positive reviews from customers on online review websites.
If you’re looking for a company that gives customers the opportunity to view products and to speak to a representative in person in its showrooms, Window Nation may be the right company for you.
Energy Efficiency of Window Nation WindowsWindow Nation’s commitment to sustainability can be seen 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 Darien?Pricing information is not available on Window Nation’s website, as the cost of window installment differs 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. For more detailed information on the cost, you can request a quote from the company.
We’ve recommended providers with good reputations, but keep in mind these are national companies, so your service may differ depending on your local crew. We have tried to stay unbiased and transparent by describing pros and cons for every company we reviewed.
More Window Companies in Darien
Renewal by Andersen of Long Island
Farmingdale, NYGood Customer Service
Free assessment
Educational Website
Price Transparency
Services Offered
Skylights
Bay Windows
Window Replacement/Installation
Glass Doors
Double-Hung
Power Home Remodeling
Melville, NYGood Customer Service
Price Transparency
Free assessment
Timely Service
Services Offered
Window Replacement/Installation
Energy-Efficient Options
United Home Experts
Norwalk, CTPrice Transparency
Free assessment
Educational Website
Good Customer Service
Services Offered
Fiberglass Frames
Window Replacement/Installation
Greenwich Windows Replacement
Greenwich, CTGood Customer Service
Free assessment
Educational Website
Price Transparency
Services Offered
Window Replacement/Installation
Bay Windows
Double-Hung
Window Depot USA of Southern CT
Trumbull, CTFree assessment
Good Customer Service
Educational Website
Timely Service
Price Transparency
Services Offered
Triple Pane Glass
Window Replacement/Installation
Bay Windows
Vinyl Frames
Energy-Efficient Options
Double-Hung
Glass Doors
Doors & Windows
Albertson, NYSunday availability
Good Customer Service
Price Transparency
Free assessment
Educational Website
Online product shopping
Free in-home or virtual consultation
Services Offered
Wood Frames
Bay Windows
Double-Hung
Vinyl Frames
Window Replacement/Installation
M & R Windows
Bronx, NYPrice Transparency
Timely Service
Services Offered
Window Replacement/Installation
Bert Falsetti's Home Improvement LLC
Shelton, CTServices Offered
Vinyl Frames
Window Replacement/Installation
Double-Hung
Energy-Efficient Options
Edge Remodeling, Inc.
Franklin Square, NYLabor warranties available
Free same-day estimates
Free assessment
Price Transparency
Good Customer Service
Family-owned and operated
Services Offered
Window Replacement/Installation
Parco Home Improvement Corp.
Franklin Square, NYFree assessment
Price Transparency
Services Offered
Energy-Efficient Options
Vinyl Frames
Window Replacement/Installation
Flawless Glass & Mirror LLC
Holbrook, NYPrice Transparency
Educational Website
Customized glass options
Free in-home consultation
Good Customer Service
Owner-operated small business
Free assessment
Services Offered
Glass Showers
Mirrors
Window Replacement/Installation
Aspen Home Remodeling, LLC.
Oradell, NJGood Customer Service
Free assessment
Educational Website
Price Transparency
Services Offered
Skylights
Energy-Efficient Options
Window Replacement/Installation
Cityproof Soundproof Windows
Long Island City, NYFree assessment
Price Transparency
No-construction services available
Over 50,000 installations completed
Timely Service
Trademark soundproof Citiwindows
Good Customer Service
Educational Website
Services Offered
Custom Window Designs
Window Replacement/Installation
Energy-Efficient Options
HDL Construction LLC — Windows replacement, Roofing, Roof service, Siding replacement, Chimney, Deck, Masonry
Hasbrouck Heights, NJ24-hour emergency service
Free in-home consultation
Good Customer Service
Free assessment
Price Transparency
Saturday and Sunday availability
Educational Website
Services Offered
Window Replacement/Installation
Putnam Windows Inc.
Cold Spring, NYFree assessment
Price Transparency
Educational Website
Good Customer Service
Services Offered
Vinyl Frames
Window Replacement/Installation
Wood Frames
Glass Doors
F5 Remodeling
Rutherford, NJFamily-owned and operated
Full-service installation
Minority-owned and operated
Price Transparency
Free assessment
Good Customer Service
Educational Website
Services Offered
Window Replacement/Installation
Frank Conforti Contracting
North Haledon, NJFree assessment
Price Transparency
Educational Website
Good Customer Service
Services Offered
Skylights
Window Replacement/Installation
Window Repair
Energy-Efficient Options
Ben Window & Glass
Brooklyn, NYWide selection
Educational Website
Free assessment
Weekend availability
Price Transparency
Foggy window repair
Services Offered
Window Repair
Window Replacement/Installation
MK Window Treatments
Greenwich, CTFree assessment
Good Customer Service
Services Offered
Window Replacement/Installation
Mr. Handyman of Huntington and Smithtown
East Northport, NYTimely Service
Price Transparency
Good Customer Service
Educational Website
Free assessment
Services Offered
Bay Windows
Window Replacement/Installation
Window Repair
Calculate how much you can expect to pay for window installation and replacement in Darien, CT 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 Darien Saves You Money
There are quite a few perks of upgrading to energy-efficient windows. A few reasons you may want to consider making the switch are the following:
- Protect your investment: When you have an older home, your windows could also be outdated or leaky. Upgrading your windows is an important part of maintaining your property and its value.
- Protect your valuables from fading: The low-emissivity coatings on some energy-efficient windows filter out damaging UV rays, preventing your furniture, carpet and other valuables from fading.
- Reduce your carbon footprint: Because energy-efficient windows improve the insulation in your house, you can cut your carbon footprint by about 12%, according to Energy Star.
- Save money on power bills: According to the Department of Energy, heat gained or lost through windows makes up about 25-30% of residential energy use. Installing energy-efficient models can help reduce how much energy is used in your home, therefore saving you about 12% more on your bills.
Estimated Cost of Window Replacement in Darien
Windows come in different purposes, styles and shapes, so costs and services will vary remarkably depending on several factors. Below, we describe the average cost and services that you can get from window installation companies.
How Much Do New Windows Cost?
Even though the average cost to install one window is around $600, it can range anywhere from $200 to $1,200. These amounts vary depending on specific characteristics of your installation, such as number of windows, the location of your home, type, size, material and more.
With windows, efficiency is one of the most important factors for many homeowners. High efficiency windows may cost more upfront, but by increasing the efficiency of your home — particularly during the summer and winter — they can provide many years of energy savings. According to Energy Star, buying certified energy-efficient windows can save Darien homeowners $441+ a year after replacing single-pane windows.
We advise requesting free quotes from multiple window installation companies to find the one that works best for your budget.
What Services do Window Installers Offer?
The first step of a window replacement is to decide whether you want a full-frame or pocket installation.
Full-frame installations require replacing the whole window — the sill, frame, trim and all. These are typically done when you want a different style for your windows or when it has a great amount of deterioration. Full-frame installations involve more time and labor and will increase overall costs. Pocket installations (also known as retrofits) are when you replace a window while leaving the old frame. Pocket installations are on the simpler end and won’t carry as large a bill, but you can’t do this type of installment if you have any pre-existing rot or water damage.
If you’re hiring a reputable window installation company, your company will be able to advise you on the best type for your project. In Darien, the choice will mostly be based on the efficiency of your home and how old your existing frames are.
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 Darien
In our search to find the most reliable, eco-friendly window installers in Darien, EcoWatch landed on the above companies as the top window installation companies in the city. We’ve reviewed the best window replacement companies in Darien mostly based on their energy efficient offerings, as it’s the most sustainable option and the best one for homeowners. Energy Star certified windows have been shown to cut your electricity bills by hundreds of dollars. Along with energy efficiency, our rating methodology takes the following factors into consideration:
Service Area
Since this is a guide for Darien, we gave more points to companies that provide services to the city. There are certainly other reputable providers that didn’t make the cut because they wouldn’t be able to serve homeowners in Darien.
Work Quality
When choosing new windows, the quality and range of services often plays 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 factor in workmanship as reflected in customer feedback.
Customer Reviews
We analyzed trends in recent online reviews to find the companies with the most consistent customer satisfaction. Customer satisfaction may be the factor we place the most value on, as it indicates the quality of services across nearly every category, including professionalism, quality of parts, quality of installation, warranty, cost and more.
Cost
This one is a give-and-take: as with other services, cheap window installation companies may not provide the most quality service. On the other hand, we want to make sure we’re highlighting companies that provide a wide range 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 with lengthy warranties for products, parts and labor rank higher with EcoWatch.
Years of Experience
Lastly, we like to see companies that have a proven track record in the industry. Window installation companies that have more years of experience earn higher rankings by our standards. We like to see at least ten years of experience.
Darien, CT Window Replacement FAQs
How much should a window install cost?
The national average cost of installing a window is about $600 but can range between $200 and $1,200, based on a few different factors. The price is usually influenced by the type and material of the window, the size of the window and the location of your property. Also, bear in mind that energy-efficient windows may cost more initially but can save you a decent amount of money a year in energy bills.
What kind of window is the most energy-efficient?
A window’s energy efficiency is affected by a number of factors, such as the quality of the installation and the kind of window. Look for Energy Star Certified windows — these are typically the most energy-efficient and are certified by the U.S. Department of Energy.
When do I have to use a window installation company?
You should use a window installation professional whenever you want to upgrade your windows. Installing windows is a complex process that can be difficult and time-consuming, so it’s best handled by the professionals.
How do you know it’s time to replace your windows?
Windows generally last about 20 to 30 years, but anytime you notice damage on your windows, it’s a good idea to have them looked at by an expert to see if they need any repairs or replacements.
How long does it generally take to install windows?
Since the average installation time of a window is 30 minutes, about 16 windows can be installed during an 8-hour work day.