Replacement Windows and Doors

Granite State Glass has earned the reputation as New Hampshire's leader in residential replacement windows thanks to thousands of satisfied clients throughout northern New England. Our simple, decades-proven process of customer focused window and door replacement is based on a foundation of three principles:

1.       Free on-site consultations: GSG will listen to your needs and furnish a proposal to you based on your needs.
2.       Safe, high quality installation: Your product is always installed by professional GSG Installers…never sub contractors.
3.       Service after the sale: You know where to find GSG if you should need us, just give us a call.

Schedule a Free On-Site Consultation

When you would like to learn more about window and door replacement options available to you, simply call your local Granite State Glass. We will set up a time to visit your home, 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.


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!

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 a 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 insure you are happy with your new windows and doors, our goal is to earn you as a client for life by providing you the best in customer service and products for your lifestyle.