Top-Rated Window Replacement Companies in Buffalo, NY
Buffalo's 10 listings below come from Google Maps rather than a state license file. IECC climate zone 5A sets the energy bar for a Buffalo window job no matter which kind of list a contractor's name comes from. Checked September 2026.
Google Maps ratings checked · How we rank
5AIECC climate zone · ENERGY STAR Northern zone
Climate and energy performance in Buffalo
Buffalo-Cheektowaga, NY piles up about 6,466 heating degree days in a normal year, against 608 on the cooling side of the ledger.
That's the load an ENERGY STAR-rated window in the Northern zone is built to handle.
Data: U.S. EPA / DOE, ENERGY STAR, ENERGY STAR Version 7.0 Climate Zones by County/ZIP (Windows, Doors, and Skylights) (V7.0); Pacific Northwest National Laboratory (DOE Building America), Guide to Determining Climate Zone by County: Building America and IECC 2021 Updates (PNNL-33270) (2021 IECC), from the nearest NOAA station 7.3 mi away.
Google's top window installers serving Buffalo, NY
Ranked by Google rating weighted against how many people left one, so a perfect score from a handful of reviewers never outranks a strong average built on hundreds. That ranking is not a license check; call the state directly and ask for the contractor's license or registration number.
| Rank | Business | Google rating | Reviews | Category | Area | Google Maps listing |
|---|---|---|---|---|---|---|
| 1 | Buffalo Glass Block | 480 | Window installation service | Buffalo 14216 | Google reviews | |
| 2 | Nu-View Window and Door | 56 | Window installation service | Cheektowaga 14206 | Google reviews | |
| 3 | RCG Windows and Doors | 82 | Window installation service | Williamsville 14221 | Google reviews | |
| 4 | Renewal By Andersen of Western New York | 1,117 | Window installation service | Buffalo 14225 | Google reviews | |
| 5 | The Window Source of WNY | 64 | Window installation service | Buffalo 14223 | Google reviews | |
| 6 | Express Windows Inc | 378 | Window installation service | Buffalo 14217 | Google reviews | |
| 7 | Big L Windows & Doors | 288 | Window installation service | Cheektowaga 14227 | Google reviews | |
| 8 | Aberdeen Plate Glass | 85 | Window installation service | Buffalo 14220 | Google reviews | |
| 9 | Pella Windows and Doors Showroom of Buffalo, NY | 336 | Window installation service | Buffalo 14225 | Google reviews | |
| 10 | Comfort Windows & Doors | 606 | Window installation service | Tonawanda 14150 | Google reviews |
Questions to ask before you sign
- How long have you held your state license, and can I see the number?
- Is this a full-frame replacement or an insert into my existing frame, and why that one?
- Who pulls the permit, and does this change trigger an egress check on a bedroom window?
- What flashing and sill pan will you use, and in what order do you install them?
- If my home was built before 1978, is your crew lead-safe certified for this job?
- What's the completion date in writing, and what happens if the schedule slips?