Windows and Doors


Granite State Glass has earned the reputation as New Hampshire's leader in residential windows and doors thanks to thousands of satisfied clients throughout New England.

The GSG Advantage is our decades-proven process of customer focused window and door replacement and is beneficial in every phase of your window and door replacement experience.

Schedule A Free On-Site Consultation

When you would like to learn more about window and door replacement options available to you, simply call or email your local Granite State Glass. A GSG Team member will assist in setting up an appointment to visit your home that is convenient for you.

A GSG Window & Door Professional will listen to what you are looking for from your new windows and doors, inspect your existing windows and view the site conditions present. We can show you samples, explain options and share the replacement procedure from concept to completion.

Are you concerned about a window representative who might be pushy or refuse to leave without a sale? Rest easy with Granite State Glass, we will stay for as long or as short a time as you need us to. Our goal is to provide you with an accurate, clear proposal specific to your window and door needs and to assist in making the best decision for you, your home and your budget. Should you choose to place an order with Granite State Glass, your customized windows and/or doors are ordered to your specific needs. Upon arrival of your windows at our facility we will contact you and schedule an installation date.

Advantage: GSG

Wide Range of Product Selection

As an industry leader, Granite State Glass partners with and has access to multiple window and door manufacturers. This allows GSG to specify the product with the features and options that will best serve the goals of your project, ensuring your satisfaction and aligning with your preference and budget.

Many companies rely on a single manufacturer for their windows and doors which can limit product options and features, leaving the client not getting exactly what they want out of their window and door project. It is your home and your project, don’t let a single product line limit your choices.

Advantage: GSG


At Granite State Glass, there is no substitute for excellence in installation. For the highest value possible for your new windows and doors professional installation is the key.

All GSG installers are employees of the company and have received extensive factory training. Installation by our GSG Team allows us to control every step of the process and contributes to the highest quality installation possible. This also gives our clientele the comfort of knowing that those on their property follow strict OSHA and Granite State Glass safety protocols, are properly insured and guarantee that you and your home will be treated with the respect and dignity they deserve.

And once your new windows and doors from Granite State Glass are installed, we even make sure to take the labels off your windows then wash them inside and out before we leave your home!

Advantage: GSG

Service After The Sale

Your windows and doors will carry the manufacturer’s product warranty which will vary dependent upon the product purchased from 5 years to lifetime. All windows installed by the Granite State Glass Team are backed by an industry leading 10-year Workmanship Warranty.

You’ll know where to find Granite State Glass should you have questions or concerns about your windows or any other glass products after your installation is complete. Our goal is not only to ensure you are happy with your new windows and doors, but to earn you as a client for life by providing you the best in customer service and products for your lifestyle.

Advantage: GSG


Our Brochure

SEE OUR GSG Advantage Brochure

Done Fast... Done Right... Guaranteed

About Us

For over 40 years, Granite State Glass has been serving the glass needs of Northern New England. With twelve locations in New Hampshire and two in Vermont, Granite State Glass is dedicated to serving their customers' needs in a safe, timely and professional manner. Granite State Glass is the choice for people who understand the value of integrity and professionalism for their auto, home, or commercial glass needs. We look forward to the opportunity to earn your business.


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