Licensed Window Contractors Based in Montclair, California
Window replacement contractors in Montclair range from long-standing shops to 0 newer entrants licensed in the last two years. Every name below comes from the California license record, not a paid submission.
Licenses checked · California Contractors State License Board
3BIECC climate zone · ENERGY STAR South-Central zone
What Montclair's climate means for your window spec
Montclair sits in IECC climate zone 3B, the starting point for any code-minimum window performance here.
ENERGY STAR places San Bernardino County in its South-Central zone for window certification.
Normal temperatures run 56°F in January and 76°F in July, so the glass package worth paying for in Montclair 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 3.9 mi away.
21median years licensed
The license record behind these listings
The median window license active in Montclair has been on the books for 21 years.
A small slice, 0 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 Montclair 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.
5 window replacement contractors based in Montclair
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 |
|---|---|---|---|---|---|---|---|---|
| Aragon Construction INC | Window and glass contractor | B General Building / C-17 Glazing | 799386 | Active | Sep 17, 2001 | Sep 30, 2027 | 91763 | Verify license |
| College Glass INC | Window and glass contractor | C-17 Glazing | 860465 | Active | Jun 17, 2005 | Jun 30, 2027 | 91763 | Verify license |
| Glassit INC | Window and glass contractor | C-17 Glazing | 1063831 | Active | Feb 28, 2020 | Feb 29, 2028 | 91763 | Verify license |
| Jayco & Associates INC | Window and glass contractor | C-17 Glazing | 1071662 | Active | Dec 4, 2020 | Dec 31, 2026 | 91763 | Verify license |
| Kirker Glass INC | Window and glass contractor | C-17 Glazing | 782506 | Active | Aug 4, 2000 | Aug 31, 2028 | 91763 | 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?