20 Best Window Companies in Dover, NH (2025 Reviews)
Looking to improve your house’s energy efficiency? The best window replacement companies can help.
We analyzed all the top-rated window companies in Dover 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
Whether you're updating for aesthetics or have damaged windows, windows play an important role in conserving your home's electricity. Damaged or outdated windows could lead to having higher energy bills during the winter or summer months.
Replacement windows improve your home’s insulation, not only making you and your family more comfortable during extreme temperatures, but also saving you some money and helping the environment.
Unlike other sites, EcoWatch ranks window replacement companies on energy efficiency while also balancing cost, customer satisfaction and service area.
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 Energy-Efficient Features
DaBella
- Great warranty
- Friendly sales representatives
- Offers good financing options
Best Window Installation & Replacement Companies in Dover
The EcoWatch team researched dozens of installers in Dover to find the best window installation companies for our readers. We assessed the providers based on energy-efficient offerings, local experience, customer service, price, coverage area 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 Dover. It's the largest window replacement company in the country, known for its vinyl windows and affordability. Window World has about 27 years of experience in the window installation industry. Many positive reviews on customer review websites back the company's reputation.
Window World may be the company for you if you want one 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 WindowsThere are a wide range of window types that Window World offers, 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 Dover?Prices are not available on Window World’s website since the cost of window replacement varies greatly depending 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. If you’d like more accurate information, you can receive a quote on the company’s website.

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 Dover. It's a subsidiary of the Andersen Corporation, a major manufacturer of windows and doors. Andersen has about 27 years of experience in the window installation industry. Many positive reviews on customer review websites back the company's reputation.
Andersen may be the company for you if you want 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 WindowsThere are a wide range of window types that Renewal by Andersen offers, 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 Dover?Prices are not available on Andersen’s website since the cost of window replacement varies greatly depending 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. If you’d like more accurate information, you can receive a quote on the company’s website.

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 offers the best window installation for businesses in Dover. It's 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 about 23 years of experience in the window installation industry. Many positive reviews on customer review websites back the company's reputation.
Aeroseal may be the company for you if you want one that installs windows and doors at businesses across the Eastern U.S.
Energy Efficiency of Aeroseal Windows WindowsThere are a wide range of window types that Aeroseal Windows offers, some of which are Energy Star products. 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 Dover?Prices are not available on Aeroseal’s website since the cost of window replacement varies greatly depending on how many and what type(s) of windows you need. However, it provides high-quality windows at a competitive price point. If you’d like more accurate information, you can receive a quote on the company’s website.
We try to remain unbiased and transparent by listing pros and cons for each company we review. Additionally, our rankings are not influenced by any partnerships.
More Window Companies in Dover
Renewal by Andersen Window Replacement
Saco, MEFree assessment
Educational Website
Good Customer Service
Price Transparency
Services Offered
Energy-Efficient Options
Vinyl Frames
Double-Hung
Metal Frames
Bay Windows
Glass Doors
Window Replacement/Installation
Custom Window Designs
DaBella
Salem, NHTimely Service
Good Customer Service
Services Offered
Vinyl Frames
Double-Hung
Glass Doors
Window Replacement/Installation
Great Bay Roofing & Exteriors
Rochester, NHGood Customer Service
Price Transparency
Educational Website
Free assessment
Services Offered
Bay Windows
Window Replacement/Installation
Skylights
Affordable Vinyl Windows & Siding Inc
Auburn, NHPrice Transparency
Good Customer Service
Services Offered
Vinyl Frames
Window Replacement/Installation
Pro Entry Installs LLC
Salem, NHGood Customer Service
Educational Website
Timely Service
Price Transparency
Services Offered
Glass Doors
Bay Windows
Window Replacement/Installation
Double-Hung
Manny's Roofing
Pelham, NHPrice Transparency
Timely Service
Free assessment
Educational Website
Good Customer Service
Services Offered
Skylights
Roof Windows
Window Replacement/Installation
Lighthouse Contracting Group, LLC
Gilford, NHEducational Website
Price Transparency
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
First Choice Construction, LLC
Beverly, MAGood Customer Service
Free assessment
Price Transparency
Services Offered
Window Replacement/Installation
Geno the Handyman
Stoneham, MAFree assessment
Timely Service
Services Offered
Window Repair
Window Replacement/Installation
Energy-Efficient Options
Dover Roofing LLC
Dover, NHFree assessment
Good Customer Service
Price Transparency
Educational Website
Services Offered
Window Replacement/Installation
Skylights
Glass Routes Co
Madbury, NHGood Customer Service
Educational Website
Free assessment
Price Transparency
Services Offered
Mirrors
Window Replacement/Installation
Custom Glass
Vinyl Frames
Glass Showers
Dependable J M R Siding
Manchester, NHFree assessment
Services Offered
Vinyl Frames
Energy-Efficient Options
Window Replacement/Installation
Dracut Window & Door
Dracut, MAEducational Website
Free assessment
Price Transparency
Services Offered
Window Replacement/Installation
Energy-Efficient Options
Odds & Ends Handyman Service
Salem, MAPrice Transparency
Services Offered
Window Replacement/Installation
Glass Doors
Cechinel Siding & Windows
Somerville, MAFree assessment
Educational Website
Good Customer Service
Services Offered
Bay Windows
Window Replacement/Installation
Portland Glass of Dover
Dover, NHFree assessment
Price Transparency
Good Customer Service
Educational Website
Services Offered
Energy-Efficient Options
Glass Repair
Window Replacement/Installation
Pella Windows & Doors of Newington
Newington, NHFree assessment
Price Transparency
Good Customer Service
Educational Website
Services Offered
Bay Windows
Window Replacement/Installation
Wood Frames
Double-Hung
Vinyl Frames
Glass Doors
Rite Window
Exeter, NHFree assessment
Price Transparency
Educational Website
Good Customer Service
Services Offered
Glass Showers
Bay Windows
Double-Hung
Glass Doors
Window Replacement/Installation
Energy-Efficient Options
The Window Source NH
Seabrook, NHGood Customer Service
Educational Website
Free assessment
Price Transparency
Services Offered
Glass Doors
Double-Hung
Energy-Efficient Options
Vinyl Frames
Bay Windows
Storm/Impact Windows
Window Replacement/Installation
Morgan Exteriors
Hooksett, NHFree assessment
Educational Website
Good Customer Service
Services Offered
Window Replacement/Installation
Calculate how much you can expect to pay for window installation and replacement in Dover, NH 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 Dover Saves You Money
Switching to energy-efficient windows can help improve the comfort of your home and help you save on power bills. Here are more details about how switching out your windows could help you:
- Protect your investment: Keeping your windows up to date is an important part of maintaining your property and its real estate value, especially if you have an older home.
- Reduce your carbon footprint: Decreasing how much energy you use also lowers your indirect greenhouse gas emissions. You could reduce it by 152 pounds per year on average.
- Save money on energy bills: The Department of Energy estimates that heat gained or lost via windows accounts for about 25-30% of household energy use. Installing energy-efficient windows can help lower that amount, which helps you save some money on your bills.
- Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which not only insulate your home better, but also filter out harmful UV rays, preventing your furniture, carpet and other valuables from fading.
Estimated Cost of Window Replacement in Dover
Each window replacement company provides varying services and has varying prices based on a few factors.
How Much Do New Windows Cost?
According to our market research, the average cost of replacing a single window is about $600. However, window installation costs can range from $200 to $1,200 for each window. How much it will cost is based on several factors, like number of windows, type, size, the location of your home, material and more.
It’s also worth noting that energy-efficient windows will almost always cost more initially, but Energy Star estimates that upgrading the windows on your Dover home can mean 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 upgrading 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 material you choose for the frames. Wood windows are generally the most expensive, but it depends on whether they are completely wood or clad with aluminum or vinyl. Fiberglass windows also tend to be a bit more expensive than vinyl, but they are shown to be more efficient.
What Services do Window Installers Offer?
When it comes to window installations, in general there are two types that your provider will offer: full-frame and pocket installations.
A full-frame installation is a total window replacement. This service involves removing the old window, the windowsill, and the exterior and interior trim. It can also involve other materials, including insulation and drip edges, which raise the overall cost of the project. It’s also worth noting that 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 replacing a window within the existing frame, which is usually cheaper than a full-frame installation.
If you’re not sure which type of window installation service you need, your installer can help you out. In general, the choice is based on factors such as the age and condition of the home, the type of building material, budget and time restrictions.
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 Energy-Efficient Features
DaBella
- Great warranty
- Friendly sales representatives
- Offers good financing options
How We Choose the Best Window Installers in Dover
EcoWatch reviews differ from other reviews since we’re examining these companies through a sustainability lens. We’ve reviewed the top window installers in Dover primarily based on energy efficiency, 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 considers the following factors:
Service Area
Because this is a guide for Dover, we gave more points to companies that serve the city. There are certainly other reputable providers that didn’t make the cut because they wouldn’t be able to serve homeowners in Dover.
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 installer included in our guide to ensure its contractors are well-qualified and that the company has received plenty of positive customer feedback to vouch for its service.
Customer Reviews
We analyzed trends in recent online reviews to determine the companies with the most customer satisfaction. Customer satisfaction might be the factor we place the most value on, as it reflects the quality of services across nearly every category, including warranty, professionalism, cost, quality of parts, quality of installation and more.
Cost
This one is a give-and-take: as with most services, cheap window companies are not going to provide the most quality service. Still, we want to ensure we’re highlighting companies that offer a range of price and financing options so they’re accessible to most homeowners.
Warranty
Protecting your investment in new windows is important. For that reason, window installation companies that provide lengthy warranties for products, parts and installation (aka workmanship) 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 are going to earn higher rankings by our standards. We like to see at least ten years of experience.
Dover, NH Window Replacement FAQs
What is the typical cost to install windows?
The national average cost to install a window is around $600 but can range between $200 and $1,200, depending on a few different factors. The price is generally influenced by the location of your property, the size of the window and the type and material of the window. Also, keep in mind that energy-efficient windows may cost more upfront but can save you a decent amount of money a year in energy bills.
What are the most common kinds of replacement windows?
The most common kinds of windows for homes include: casement windows, transom windows, picture windows, awning windows, double-hung and single-hung windows, bay windows and slider windows.
What do window installation companies do?
Window installation professionals travel to your house to remove your old windows and replace them with new ones. Some providers install products distributed by other companies, whereas others are both manufacturers and installation companies combined. The installer will also clean up after the installation.
How do you know it’s time to replace your windows?
Windows have a typical lifespan of about 20 to 30 years. If your windows are older than that, then they should probably be replaced. Other than that, if your windows have damage anywhere on them, or they have become difficult to open or close, they may be in need of replacement.