Ontario Window Replacement provides professional custom window installation in Ontario, CA for residential and commercial properties across the West End of the Inland Empire. A lot of Ontario's tract housing from the late eighties onward put a half-round transom over the front door and a clipped corner on the stair landing. Those shapes are the reason this page exists, and none of them come off a shelf.
A radius is not a figure you read off a tape measure. The arch above your entry was framed in place by a carpenter working to a story pole, and after thirty years of a stucco wall moving it is rarely a true half circle any more.
So we template. A rigid pattern gets cut to the opening itself, marked with which opening it came from and which way is up, and that pattern becomes the factory drawing. Order a catalog radius by eye instead and the unit arrives looking right, then shows you the error as a wedge of daylight at the crown.
The other shapes we see across this city are a short list that repeats: clipped corners on stair landings, octagons in a bathroom gable, oversized fixed lites in a two-story entry, and the raked triangle where a ceiling follows the roof. Each one is measured on its own. Two that look identical from the curb seldom are.
Lead time follows from that. A custom unit is a manufacturing run scheduled against other people's runs rather than a pick from a warehouse, and the deposit buys extrusion and cut glass that fits one opening in the world. That is the honest reason we will not start one until the template is signed off.
Think about year twelve as well. If a sealed unit in a stock slider fogs, a distributor has one. If a custom arch fogs, somebody re-templates the opening and waits. Keep the order paperwork and the shape record where you can find it, and photograph the template before it leaves.
On the code side, California writes its own energy code rather than adopting an IECC edition, and Part 6 of Title 24 is it, with the 2025 edition applying to permits pulled since the first of January. Our energy-efficient window page carries the targets and the easier figure a small replacement area is allowed.
Permits are a city matter in California. Ontario's building department decides what your scope needs, the compliance certificate goes in with the application, and the installer signs the installation certificate once the units are set. Change the shape of an opening rather than filling the existing one and you have added framing review to the job.
The recommendation. Template every non-rectangular opening, order the shapes in one run so the finishes match, and keep the rectangles stock. If a standard size fits your opening with trim, buy the standard size, because paying custom money for a rectangle buys a longer wait and no replacement part. We mark which of your openings are which before anyone takes a deposit.
Our insured and bonded team brings the right materials and equipment to every job — center-set aluminum storefront framing in 1-3/4 by 4-1/2 inch profiles, dry-glazed EPDM gaskets and wet-glazed structural silicone joints, subsill flashing with end dams under storefront base members, tempered and heat-strengthened lites carrying CPSC 16 CFR 1201 labels, aluminum entrance doors with the 10 inch ADA bottom rail, offset pivots, top jamb closers and concealed vertical rod exit devices — and backs the work with a written workmanship warranty. We serve Ontario and nearby communities including Chino, Chino Hills, Montclair, Upland.
What the Job Covers
Everything our custom window installation in Ontario covers
One crew, one point of contact, and the full range of custom window installation work in Ontario, CA. If it is on this list we do it in house rather than handing it to a subcontractor:
- arched window replacement ontario california
- radius window templating inland empire
- clipped corner window replacement ontario
- oversized fixed glass installation san bernardino county
- gable triangle window ontario california
Not sure which one describes your situation? Describe it in plain words and we will sort it out — or browse the rest of our Ontario services.
Materials, equipment and how we do custom window installation
The difference between custom window installation that lasts and custom window installation that gets redone in three years is almost always preparation and materials, not the finish you see on day one. We work with center-set aluminum storefront framing in 1-3/4 by 4-1/2 inch profiles, dry-glazed EPDM gaskets and wet-glazed structural silicone joints, subsill flashing with end dams under storefront base members, tempered and heat-strengthened lites carrying CPSC 16 CFR 1201 labels, spec them to the job instead of to the invoice, and write the material grades into the free estimate so you know exactly what you are buying.
Every Ontario job runs the same way: site walk and measurements, written scope and fixed price, protection of the surrounding area, then the work itself with a daily clean-up. Years of window work in the West End of the Inland Empire means we have already met whatever your property is going to throw at us — awkward access, older construction, an HOA with opinions.
Where we do custom window installation outside Ontario
Ontario Window Replacement covers Ontario and the surrounding communities of the West End of the Inland Empire. Crews run out to the same nearby cities every week, so an out-of-town job does not mean an out-of-town price.
- Custom Window Installation in Chino, CA — San Bernardino County, incorporated in 1910, population 91,403 at the 2020 census, with dairy-preserve land on the south side turning over to distribution buildings
- Custom Window Installation in Chino Hills, CA — San Bernardino County, incorporated in 1991, population 78,411 at the 2020 census, almost entirely built after 1980 and overwhelmingly residential
- Custom Window Installation in Montclair, CA — San Bernardino County, incorporated in 1956, population 37,865 at the 2020 census, in a five and a half square mile footprint dominated by retail frontage
- Custom Window Installation in Upland, CA — San Bernardino County, incorporated in 1906, population 79,040 at the 2020 census, with a pre-war downtown core and hillside tracts above Foothill Boulevard
- Custom Window Installation in Pomona, CA — Los Angeles County, incorporated in 1888, population 151,713 at the 2020 census, the largest city in the Pomona Valley and the oldest housing stock we cover
- Custom Window Installation in Claremont, CA — Los Angeles County, incorporated in 1907, population 37,266 at the 2020 census, with a walkable village core and a large protected residential historic district
Start on the Ontario Window Replacement homepage for a free estimate, or call (844) 422-0623 and describe the job.
Why Ontario Chooses Ontario Window Replacement
- ✓Two estimating methods, and the quote says which one you are reading. Residential is per opening. Commercial is glazed square foot plus framing linear foot, with the after-hours premium shown on its own line instead of buried in a unit price.
- ✓We hold the CSLB C-17 glazing classification, the one that covers commercial glass. A great deal of residential window work in this region is sold by outfits that cannot legally glaze your storefront, and they rarely volunteer that.
- ✓Warranty documents are never merged. A house gets the manufacturer's residential terms. A commercial opening gets the commercial terms, which are shorter, and we would rather explain why now than have you find out in year eleven.
- ✓Permit path stated before you sign. Residential retrofit is usually over the counter. Commercial can mean plan check, an accessibility review of the path of travel, and an inspection sequence that quietly decides your schedule.
Want a written custom window installation estimate in Ontario?
Call (844) 422-0623 or send the short form — no pressure, same-day reply on most requests.
The standards behind custom window installation
Quality here is not a matter of opinion — it is written down. The custom window installation work we do in Ontario follows published industry standards: NFRC sets the U-factor and SHGC ratings on every window label, and ENERGY STAR defines the efficiency thresholds by climate zone. If a contractor cannot tell you which standard a detail comes from, that is worth asking about before you sign.
Every custom window installation project in Ontario gets the same attention, whether it is a single room or a full commercial job. We show up on schedule, keep the site clean, and stand behind the work — the estimate is free and there is no pressure.
Ready to get started? Call (844) 422-0623 for a free custom window installation free estimate in Ontario, or request a quote on our contact page and we'll get right back to you.