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Tri-State Window & Siding is a vinyl siding and replacement window company. Its website lists windows and doors, vinyl siding, roofing, sunrooms, decks and patios, porches, kitchen and bathroom remodeling, home additions, in-law apartments and garages, and the company describes itself as 35 years in business. Its Massachusetts home improvement contractor registration, number 154681, is active on the state registry, held by Tri-State Window and Siding Company, Incorporated. The Better Business Bureau gives it an A+ grade, and BuildZoom shows 27 of its projects. In a January 2024 Reddit thread, a poster said Tri State Window and Siding in Londonderry replaced all their windows and "did a great, fast job."
“Call Tri State Window and Siding in Londonderry. They replaced all my windows and did a great, fast job.”
“Maybe give Tri-state Windows a call and see if you're in their service area. ([http://www.tristatewindow.com/](http://www.tristatewindow.com/)) They're doing our windows now and gave us a good price, no fuss.”
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1 change recorded — last scanned Oct 23, 2026.
Typical New Hampshire range for this kind of work, from regional averages — not a quote from TRI-STATE WINDOW & SIDING. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$3,500 – $9,700
Typical exterior project around $6,600
