Top-Rated Window Replacement Companies in Hillsborough, NJ
Hillsborough's 9 listings below come from Google Maps rather than a state license file. IECC climate zone 5A sets the energy bar for a Hillsborough 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 Hillsborough
Weather at that level is one more reason the flashing and sill pan under a Hillsborough window matter as much as the glass sitting in it.
So ask any Hillsborough contractor how they handle both, not just which brand they carry.
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 5 mi away.
Google's top window installers serving Hillsborough, NJ
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 | Hammer Exteriors | 96 | Window installation service | Somerset 08873 | Google reviews | |
| 2 | EJV WINDOWS LLC | 82 | Window installation service | Bridgewater 08807 | Google reviews | |
| 3 | Markey Windows, Doors & More LLC. | 340 | Window installation service | Bridgewater 08807 | Google reviews | |
| 4 | Mighty Dog Roofing of Bridgewater | 179 | Window installation service | Bridgewater 08807 | Google reviews | |
| 5 | Kepo Siding & Windows | 86 | Window installation service | Hillsborough Township 08844 | Google reviews | |
| 6 | Home Genius Exteriors | 773 | Window installation service | Somerset 08873 | Google reviews | |
| 7 | Top Cut Glass LLC | 18 | Window installation service | Bridgewater 08807 | Google reviews | |
| 8 | Image Glass | 42 | Window installation service | Hillsborough Township 08844 | Google reviews | |
| 9 | Classic Window & Glass, LLC. | 89 | Window installation service | Not listed | 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?