20 Best Window Companies in Portland, ME (2025 Reviews)
Looking to improve your house’s insulation? The top window replacement companies can help.
We analyzed all the top-rated window companies in Portland 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 a vital role in conserving electricity in your home. When it’s the middle of winter, your old and leaky windows could be making your home more difficult to heat and costing you more in power bills.
Replacement windows improve the insulation in your home, not only making you more comfortable during extreme temperatures, but also saving you money and helping the environment.
Efficient windows are of particular importance in Portland, where winters are long and cold. According to Energy Star, switching to energy-efficient windows can save the average homeowner up to $396 per year.
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 Portland
The EcoWatch Reviews team assessed dozens of window installation companies in Portland to find the best ones for our readers. We assessed the companies on their energy-efficient offerings, local experience, coverage area, customer service, price and more.

Window World
EnergyStar Partner
Large serice area
Low prices relative to competitors
Great industry reputation
Lifetime warranty
Quality of service will depend on your area
Window World offers windows expertise in Portland. Window World has over 27 years of experience in the industry, and it currently serves 200 locations nationwide.
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 WindowsWindow World carries some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to ask for high-quality 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 Portland?Prices aren’t mentioned on Window World’s website, but it's known for offering some of the most affordable window installations around. The best way to know for sure is to request a free 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 offers the best availability in Portland. Andersen has over 27 years of experience in the industry, and it currently serves nearly every state except Mississippi and West Virginia.
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 WindowsRenewal by Andersen carries some Energy Star windows, but note that not all its windows are energy-efficient, so be sure to ask for high-quality 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 Portland?Prices aren’t mentioned on Andersen’s 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 request a free quote from the company.
We aim to stay unbiased and transparent by describing pros and cons for each company we review. Additionally, our rankings are not influenced by any partnerships.
More Window Companies in Portland
Renewal by Andersen Window Replacement
Saco, MEGood Customer Service
Educational Website
Price Transparency
Free assessment
Services Offered
Vinyl Frames
Bay Windows
Double-Hung
Custom Window Designs
Energy-Efficient Options
Glass Doors
Metal Frames
Window Replacement/Installation
Great Bay Roofing & Exteriors
Rochester, NHEducational Website
Good Customer Service
Price Transparency
Free assessment
Services Offered
Skylights
Window Replacement/Installation
Bay Windows
Lighthouse Contracting Group, LLC
Gilford, NHPrice Transparency
Good Customer Service
Educational Website
Free assessment
Services Offered
Window Replacement/Installation
Midcoast Glass & Windows
Topsham, MEFree assessment
Good Customer Service
Price Transparency
Services Offered
Storm/Impact Windows
Energy-Efficient Options
Window Replacement/Installation
Glass Doors
Glass Repair
Bay Windows
Glass Showers
Vinyl Frames
Dover Roofing LLC
Dover, NHEducational Website
Price Transparency
Good Customer Service
Free assessment
Services Offered
Skylights
Window Replacement/Installation
Glass Routes Co
Madbury, NHEducational Website
Price Transparency
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Mirrors
Custom Glass
Vinyl Frames
Glass Showers
Pella Windows & Doors of Scarborough
Scarborough, MEFree assessment
Good Customer Service
Educational Website
Services Offered
Bay Windows
Glass Doors
Double-Hung
Window Replacement/Installation
Portland Glass of Dover
Dover, NHPrice Transparency
Free assessment
Good Customer Service
Educational Website
Services Offered
Glass Repair
Window Replacement/Installation
Energy-Efficient Options
Pella Windows & Doors of Newington
Newington, NHGood Customer Service
Free assessment
Educational Website
Price Transparency
Services Offered
Vinyl Frames
Window Replacement/Installation
Wood Frames
Bay Windows
Glass Doors
Double-Hung
Rite Window
Exeter, NHPrice Transparency
Free assessment
Good Customer Service
Educational Website
Services Offered
Glass Showers
Energy-Efficient Options
Double-Hung
Window Replacement/Installation
Bay Windows
Glass Doors
The Window Source NH
Seabrook, NHEducational Website
Price Transparency
Free assessment
Good Customer Service
Services Offered
Double-Hung
Vinyl Frames
Glass Doors
Storm/Impact Windows
Window Replacement/Installation
Bay Windows
Energy-Efficient Options
Clearview Sunroom & Window LLC
Barrington, NHGood Customer Service
Free assessment
Educational Website
Services Offered
Window Replacement/Installation
Portland Glass of Portsmouth
Portsmouth, NHPrice Transparency
Educational Website
Good Customer Service
Free assessment
Services Offered
Window Replacement/Installation
Glass Repair
Glass Showers
Broken Glass Company
Wells, MEEducational Website
Good Customer Service
Services Offered
Glass Repair
Custom Glass
Skylights
Window Replacement/Installation
Glass Doors
Glass Showers
Interstate Glass & Mirror Inc
Somersworth, NHPrice Transparency
Services Offered
Bay Windows
Glass Showers
Window Replacement/Installation
Glass Doors
Screen Repair
Mirrors
Pella Windows & Doors of Meredith
Meredith, NHFree assessment
Good Customer Service
Educational Website
Price Transparency
Services Offered
Bay Windows
Glass Doors
Window Replacement/Installation
Double-Hung
A-BEST Window
South Portland, MEFree assessment
Price Transparency
Good Customer Service
Services Offered
Energy-Efficient Options
Window Replacement/Installation
Window World of Southern Maine
Westbrook, MEEducational Website
Free assessment
Good Customer Service
Price Transparency
Services Offered
Window Replacement/Installation
Bay Windows
Glass Doors
Double-Hung
Norton Exteriors
Epping, NHFree assessment
Good Customer Service
Price Transparency
Timely Service
Services Offered
Window Replacement/Installation
Southers Construction
Dover, NHEducational Website
Free assessment
Price Transparency
Timely Service
Good Customer Service
Services Offered
Bay Windows
Window Replacement/Installation
Double-Hung
Calculate how much you can expect to pay for window installation and replacement in Portland, ME 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 Portland Saves You Money
Upgrading to energy-efficient windows can help improve the comfort of your home and help you save on energy bills. Here's more information on how switching out your windows could help you:
- Save on energy bills: Upgrading to energy-efficient windows lowers your energy bills by about 12% since you use less energy.
- Protect your investment: If you have an older home, your windows are most likely outdated. Upgrading your windows can improve the insulation in your home and also help increase the value of your property if you decide to sell.
- Protect your valuables: Many energy-efficient windows have low-emissivity coatings, which not only provide better insulation for your home, but also filter out harmful UV rays, preventing fading of your furniture, carpet and other valuables.
- Reduce your carbon footprint: You can reduce your indirect greenhouse gas emissions by about 12% once you install Energy Star certified windows. In Portland, that’s about 163 pounds per year on average.
Estimated Cost of Window Replacement in Portland
Windows come in different shapes and sizes, so costs and services will vary considerably. Here are the average costs and the primary services that you’ll find from window installers.
How Much Do New Windows Cost?
Even though the average cost to install a single window is about $600, it can range from $200 to $1,200. These estimates vary based on the specifics of your installation, like type, number of windows, material, the location of your home, size and more.
Bear in mind that energy-efficient windows may cost more upfront, but Energy Star estimates the upgrade will save you between $101 and $583 a year when you install single-pane windows and between $27 and $197 per year when you install double-pane, clear glass windows. Your exact savings will vary based on your local climate, energy rates and individual home characteristics.
Requesting free quotes from multiple providers is the best way to find out which one is right for you.
What Services do Window Installers Offer?
In general, there are two types of window replacement services you can get: full-frame and pocket installations.
Full-frame installations are usually recommended when you want a new style or your window has a lot of rot or deterioration. With this service, your professionals will replace the total window, including the sill, frame and trim. Pocket installations are on the simpler end and won’t cost as much because they involve 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.
If you’re still debating which type of installation to get, you can ask your provider and get their advice. The choice mostly depends on how old the frames are and if there’s any damage.
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 Portland
The EcoWatch Reviews team is different from most reviewers, as we examine these companies through a sustainability lens. We’ve reviewed the top window replacement companies in Portland primarily based on energy efficiency, as it’s what’s best for the environment and for you as a homeowner. Energy-efficient windows can reduce 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 Portland, we paid more attention to companies that provide services to the city. There are other reputable providers that didn’t make the cut because they wouldn’t be able to serve homeowners in Portland.
Work Quality
When picking new windows, the quality and range of services can often play just as important of a role in insulation and performance as the type of window you choose. We do give window installers higher marks if they offer high-quality products, but we also consider workmanship as reflected in customer feedback.
Customer Reviews
Another self-explanatory yet super important review factor is customer feedback. If the majority of customers don’t have nice feedback about their service from a certain installer, you won’t see it featured on EcoWatch.
Cost
This one is a give-and-take: similar to most services, cheap window installation companies won’t always provide the highest quality service. Still, we want to make sure we’re highlighting companies that offer a spectrum of price and financing options so they’re accessible to most homeowners.
Warranty
Protecting your investment in new windows is important to many homeowners. That’s why window installation companies that provide 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 are going to earn higher rankings by our standards. We like to see at least ten years of experience.
Portland, ME Window Replacement FAQs
How much should a window install cost?
The average cost of replacing a single window can range between $450 and $650. There are a variety of factors that influence the cost, such as the number of windows, your property’s location, local labor costs, the materials used in designing the windows, how energy-efficient the windows are and styles and sizes of windows.
What are the different types of windows?
The most common kinds of windows for homes include: casement windows, transom windows, bay windows, double-hung and single-hung windows, picture windows, slider windows and awning windows.
Do you really have to use a window installation company?
You should hire a window installation company whenever you want to upgrade your windows. Installing windows is a involved process that can take a lot of time, so it’s best handled by the professionals.
What time of year should I replace my windows?
Although you can install windows any time of year, warmer weather is typically better for installing replacement windows. Additionally, the weather should be dry, as rain can make the installation harder.