Licensed Window Contractors Based in Duarte, California
Duarte has 5 window replacement contractors on active state license records. The oldest of them has held a window or glazing license since 2008, and the median listing has carried one for 7.9 years.
Licenses checked · California Contractors State License Board
3BIECC climate zone · ENERGY STAR South-Central zone
What Duarte's climate means for your window spec
Duarte sits in IECC climate zone 3B, the starting point for any code-minimum window performance here.
ENERGY STAR places Los Angeles County in its South-Central zone for window certification.
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 2.5 mi away.
7.9median years licensed
The license record behind these listings
The median window license active in Duarte has been on the books for 7.9 years.
A small slice, 1 of them, sit inside a 90-day window for renewal as of our last check, which is ordinary license-cycle timing rather than a mark against the business.
Match the number on any Duarte listing here against California's own lookup before you pick up the phone.
Data: California Contractors State License Board license records, checked 2026-09-30.
Duarte window and glazing licenses on file
Listed A to Z by business name. No listed business paid for placement or position.
| Business | Category | License class | License no. | Status | Effective | Expires | ZIP | Official record |
|---|---|---|---|---|---|---|---|---|
| Gavidia Glass Services | Window and glass contractor | C-17 Glazing | 1046496 | Active | Nov 2, 2018 | Dec 31, 2027 | 91010 | Verify license |
| M Martinez Glazing | Window and glass contractor | C-17 Glazing | 1011595 | Active | Mar 2, 2016 | Mar 31, 2028 | 91010 | Verify license |
| Magnum Glass INC | Window and glass contractor | C-17 Glazing | 1159291 | Active | Aug 6, 2026 | Aug 31, 2028 | 91010 | Verify license |
| Sapphire Glass | Window and glass contractor | C-17 Glazing | 1125739 | Active | Aug 28, 2024 | Aug 31, 2028 | 91010 | Verify license |
| Taus | Window and glass contractor | C-17 Glazing | 925088 | Active | Nov 19, 2008 | Nov 30, 2026 | 91010 | Verify license |
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?