Top-Rated Window Replacement Companies in Frankfort, IL
Frankfort's 9 listings below come from Google Maps rather than a state license file. IECC climate zone 5A sets the energy bar for a Frankfort window job no matter which kind of list a contractor's name comes from. Checked October 2026.
Google Maps ratings checked · How we rank
5AIECC climate zone · ENERGY STAR Northern zone
Climate and energy performance in Frankfort
Weather at that level is one more reason the flashing and sill pan under a Frankfort window matter as much as the glass sitting in it.
So ask any Frankfort 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 4 mi away.
Google's top window installers serving Frankfort, IL
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 | PROMAL Window & Siding Contractor | 34 | Window installation service | New Lenox 60451 | Google reviews | |
| 2 | Hanlon's Construction Inc. | 62 | Window installation service | Frankfort 60423 | Google reviews | |
| 3 | Apex Window Werks | 29 | Window installation service | Frankfort 60423 | Google reviews | |
| 4 | Compass Window and Door | 76 | Window installation service | New Lenox 60451 | Google reviews | |
| 5 | H. W. Molthan & Son, Inc. | 12 | Window installation service | Frankfort 60423 | Google reviews | |
| 6 | reNEW Windows and Siding | 52 | Window installation service | Frankfort 60423 | Google reviews | |
| 7 | Excel Windows | 136 | Window installation service | Tinley Park 60487 | Google reviews | |
| 8 | S & J Door, Inc. | 6 | Window installation service | Frankfort 60423 | Google reviews | |
| 9 | Schaaf Window Company | 57 | Window installation service | Tinley Park 60477 | 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?