Top-Rated Window Replacement Companies in Lake Forest, CA
Lake Forest's 10 listings below come from Google Maps rather than a state license file. IECC climate zone 3B sets the energy bar for a Lake Forest window job no matter which kind of list a contractor's name comes from. Checked September 2026.
Google Maps ratings checked · How we rank
3BIECC climate zone · ENERGY STAR South-Central zone
What Lake Forest's climate means for your window spec
Weather at that level is one more reason the flashing and sill pan under a Lake Forest window matter as much as the glass sitting in it.
So ask any Lake Forest 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 5.3 mi away.
10 top-rated window replacement companies in and near Lake Forest
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 | Your Glass Guy | 97 | Window installation service | Not listed | Google reviews | |
| 2 | Mancino Door & Window, Inc. | 136 | Window installation service | Laguna Hills 92653 | Google reviews | |
| 3 | Window Jazz | 45 | Window installation service | Laguna Hills 92653 | Google reviews | |
| 4 | Ameriside | 305 | Window installation service | Lake Forest 92630 | Google reviews | |
| 5 | Renewal by Andersen of Greater Los Angeles - Laguna Hills | 215 | Window installation service | Laguna Hills 92653 | Google reviews | |
| 6 | Newman Windows and Doors - Mission Viejo | 60 | Window installation service | Mission Viejo 92691 | Google reviews | |
| 7 | Ace Mirror & Glass | 380 | Window installation service | Laguna Hills 92653 | Google reviews | |
| 8 | Saddleback Valley Screen & Window | 10 | Window installation service | Mission Viejo 92691 | Google reviews | |
| 9 | Saddleback Window Replacements, Inc. | 4 | Window installation service | Lake Forest 92630 | Google reviews | |
| 10 | Eisenbart & Sons Windows & Doors | 42 | Window installation service | Mission Viejo 92691 | 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?