St. Ann, MO's Highest-Rated Window Installers on Google
St. Ann's 6 listings below come from Google Maps rather than a state license file. IECC climate zone 4A sets the energy bar for a St. Ann window job no matter which kind of list a contractor's name comes from. Checked October 2026.
Google Maps ratings checked · How we rank
4AIECC climate zone · ENERGY STAR North-Central zone
What St. Ann's climate means for your window spec
St. Louis County sees about 41.7 inches of precipitation and 16.6 inches of snow in a normal year.
Weather at that level is one more reason the flashing and sill pan under a St. Ann window matter as much as the glass sitting in it.
So ask any St. Ann 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 1.9 mi away.
6 top-rated window replacement companies in and near St. Ann
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 | Chaney Windows And Doors | 542 | Window installation service | Maryland Heights 63043 | Google reviews | |
| 2 | STL Windows and Doors | 200 | Window installation service | Earth City 63045 | Google reviews | |
| 3 | STL Windows Direct | 103 | Window installation service | Maryland Heights 63043 | Google reviews | |
| 4 | Renewal by Andersen | 2,361 | Window installation service | Bridgeton 63044 | Google reviews | |
| 5 | Window World of St. Louis | 1,003 | Window installation service | Earth City 63045 | Google reviews | |
| 6 | The Window Store - W-S Window & Door Co. | 16 | Window installation service | St. Louis 63146 | 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?