Looking for a spray foam installer in Ontario, CA? Describe your project once and up to five spray foam installers who work in Ontario and San Bernardino County get back to you with a quote. It's free and there is no obligation.
Ontario is home to about 185,285 people (2024 Census Bureau estimate), a growing community (+5.7% since 2020). With 3,707 people per sq mi, it is a suburban area. Hot summers, cold winters and leaky older homes make air sealing a priority here.
Ontario at a glance
- Population (Census Bureau estimate, 2024)
- 185,285 (+5.7% since 2020)
- Rank in California
- 25th of 482 cities and towns
- Land area
- 50 sq mi
- Population density
- 3,707 people per sq mi (suburban)
- Type
- City (Ontario city)
- Main county
- San Bernardino County
What to check before hiring in Ontario
- Training: ask about applicator training and safety practices.
- Code: in California, the energy and residential codes set R-values and barrier requirements.
- Rebates: utilities sometimes rebate insulation upgrades.
- Price drivers: area, foam type, thickness and prep.
Useful official resources
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U.S. Department of Energy: insulation
Official information and guidance.
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Spray Polyurethane Foam Alliance
Official information and guidance.
Services available in Ontario
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Attic spray foam
Spray foam on the roof deck or attic floor, often to create a conditioned attic.
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Walls, rim joists and crawl spaces
Spray foam in open walls, rim joists, basements or crawl spaces.
Frequently asked questions in Ontario
How much does spray foam cost in Ontario, CA?
It depends on area, foam type and thickness. Describe your project: installers who serve Ontario reply with a quote.
How long does installation take?
Often a day for a typical attic, plus curing time.
Can foam go over old insulation?
Usually old material is removed first; ask the installer.
Which spray foam installers will contact me?
Up to five independent spray foam installers who serve Ontario and the surrounding area, chosen for the service you need. Your details are shared only with your consent.
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.