Windows in Connecticut & Massachusetts
Our Connecticut and Massachusetts window replacement company provides outstanding products and installation services.
Window Replacement
When it’s time for new windows, we make it possible to invest in high-performance products that provide the beauty, ventilation, and lighting you need.
Learn MoreWindow Types & Styles
Select from a range of window options to suit every room in your house, including double-hung windows, bow windows, casement windows, and more.
ProVia Windows
Not all windows deliver the same level of performance. ProVia Windows are crafted for superior energy efficiency, durability, and timeless style, making them a trusted choice for your home.
Limited Time Offers
Pay Nothing Upfront—0% for 12 Months!
Get started today with Millstream Construction—no interest, no application fee for 12 months!
25 Years of Trusted Craftsmanship
Millstream Construction backs every project with a 25-year workmanship warranty.
GAF Warranties for Lasting Roof Protection
Secure your home with trusted GAF warranties from Millstream Construction.
Reputable Connecticut and Massachusetts Window Installers
Quality products and precise installations are essential when investing in new windows. When you team up with us at Millstream Construction, you can expect nothing less! Because of our dedication, we are BBB-accredited and A+ rated, as well as a multi-time winner of the Angi “Super Service Award.”

Durable Construction
Our windows are made with quality frames and hardware resistant to wind damage, impacts, and more. The result is long-lasting, and window maintenance is a breeze!

Professional Installation
Your project is carried out by a skilled window replacement contractor, ensuring your window installation is completed in a timely, clean, and professional manner.

Energy-Saving Benefits
Seal out drafts, keep your home interior more comfortable, and reduce your energy costs with our carefully installed energy-efficient windows.

Attractive Pricing
Although we only work with top window manufacturers, we provide competitive pricing and a variety of easy financing options.
Browse Our Project Gallery
See examples of our best work for yourself by visiting our online project gallery today!
Trusted Replacement Window Installer for Connecticut & Massachusetts
Windows are a great investment when you have the right team for the job. At Millstream Construction, our team proudly brings more than 50 years of combined experience serving homeowners across Connecticut and Massachusetts to every job. We also hope to assist you, starting with a free quote. Review our service areas list today to find solutions near you!
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