Top-Rated Window Replacement Companies in Mill Creek, WA
Mill Creek's 7 listings below come from Google Maps rather than a state license file. IECC climate zone 4C sets the energy bar for a Mill Creek window job no matter which kind of list a contractor's name comes from. Checked October 2026.
Google Maps ratings checked · How we rank
4CIECC climate zone · ENERGY STAR Northern zone
What Mill Creek's climate means for your window spec
IECC rates Mill Creek's climate zone as 4C, the starting point for any code-minimum window performance here.
ENERGY STAR places Snohomish County in its Northern zone for window certification.
Normal temperatures run 41°F in January and 64°F in July, so the glass package worth paying for in Mill Creek isn't the same one that pencils out two zones over.
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 4.5 mi away.
7 top-rated window replacement companies in and near Mill Creek
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 | Emerald City Energy Windows & Doors | 281 | Window installation service | Bothell 98021 | Google reviews | |
| 2 | Glass Experts | 63 | Window installation service | Bothell 98012 | Google reviews | |
| 3 | Green City Window Door & Siding | 110 | Window installation service | Bothell 98012 | Google reviews | |
| 4 | Seattle Home Windows | 39 | Window installation service | Lynnwood 98037 | Google reviews | |
| 5 | Energy Exteriors NW | Window Replacements, Doors and Siding | 169 | Window installation service | Bothell 98012 | Google reviews | |
| 6 | Mr Elk Exteriors | 19 | Window installation service | Mill Creek 98012 | Google reviews | |
| 7 | Goldfinch Brothers, Inc. | 86 | Window supplier | Everett 98204 | 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?