Contact Ontario Window Replacement for a free estimate

A real person from Ontario Window Replacement reads it, calls you back, and books a site visit — usually within one business day. We measure, look at the actual condition of the work area, and send a written, itemized free estimate. No deposit, no obligation, and no pressure call afterwards.

In a hurry? Calling (844) 422-0623 is always faster than a form.

Monday through Saturday, 8am to 6pm, with emergency calls answered outside those hours. Forms that arrive in the evening get a call back the next morning, and a site visit is usually booked within one to two business days depending on where in the West End of the Inland Empire you are.

Everything is handled by Ontario Window Replacement people in Ontario, CA — not an overseas call centre working from a script. If you would rather not explain the whole thing twice, calling (844) 422-0623 once beats a form and a follow-up.

Most of the requests that land here fall into a handful of jobs. If yours is on this list, there is already a page with scope, materials and pricing detail for Ontario:

• Full Window Replacement — A whole-house job is a contract before it is a building project, and most of what goes wrong later was decided by what the paperwork failed to say. A single total with the words all windows written beside it is not a scope of work.
• Residential Window Installation — Anchoring gets decided in ten seconds and lived with for thirty years. What the screws pass through, what they land in, how many there are and how hard they are driven is the difference between a window that holds and one that works loose.
• Commercial Window Installation — This is the page the rest of the site keeps pointing at. Ontario runs on distribution, retail and light industry, and the glass at the front of those buildings is a separate market with its own pricing, its own permits and its own warranty terms.
• Energy-Efficient Window Installation — A window label rates the whole assembly, frame and spacer included, never the glass on its own. In Ontario, Climate Zone 10, that assembly has to show a 0.30 U-factor and a 0.23 SHGC to satisfy the 2025 Energy Code on a replacement job.
• Vinyl Window Replacement — Vinyl is the correct answer for most houses in Ontario and the wrong answer for almost every storefront. That sentence is the whole page, but the reasons behind it decide whether you get a window that lasts thirty years or one that sags in eight.
• Wood Window Replacement — Clad-wood is the only window we sell for a reason that is not technical. You buy it because you want wood on the inside of the room, and everything else about the product is engineering built to make that survivable outdoors.

Something not on the list? Send it anyway. The list covers what we see most often around Ontario, not the limit of what we handle.

Ontario and the surrounding communities of the West End of the Inland Empire, including Chino, Chino Hills, Montclair, Upland, Pomona. Each of those has its own page with local detail:

• Chino, CA — San Bernardino County, incorporated in 1910
• Chino Hills, CA — San Bernardino County, incorporated in 1991
• Montclair, CA — San Bernardino County, incorporated in 1956
• Upland, CA — San Bernardino County, incorporated in 1906
• Pomona, CA — Los Angeles County, incorporated in 1888
• Claremont, CA — Los Angeles County, incorporated in 1907

Or start from the full list of Ontario services.

Rough measurements or square footage, photos of the area from a few angles, any material or finish you already have in mind, and your target timeline. None of it is required, but it makes the first free estimate far more accurate.

Nothing. The site visit and the written, itemized free estimate are free across Ontario and the West End of the Inland Empire, with no deposit and no obligation to book. We would rather price the job properly and lose it than win it on a number we made up over the phone.

Yes. Ontario Window Replacement runs its own crews in Ontario, CA — the people who quote your window job are the people who show up to do it. Licensed California contractor holding the CSLB C-17 glazing classification, the classification that covers cutting, assembling and installing glass in dwellings and in commercial structures alike, General liability and workers compensation in force, plus the $25,000 contractor's license bond every California licensee has been required to carry since Senate Bill 607 took effect on January 1, 2023. Nothing gets sold on to whoever is cheapest that week.