Looking for a special inspection agency in Ontario, CA? Describe your project once and up to three special inspection agencies 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. Commercial and multifamily projects here require special inspections for structural work.
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
- Statement: the building official approves the statement of special inspections.
- Independence: in California, the owner usually hires the agency.
- Certifications: ask for ICC, ACI or AWS credentials.
- Price drivers: scope, site visits, lab tests and reports.
Useful official resources
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ICC: International Code Council
Official information and guidance.
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ACI: American Concrete Institute
Official information and guidance.
Services available in Ontario
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Special inspections and testing
IBC chapter 17 special inspections and materials testing for a construction project.
Frequently asked questions in Ontario
How much do special inspections cost in Ontario, CA?
It depends on the scope, visits and tests. Describe your project: agencies who serve Ontario reply with a proposal.
How fast can inspectors come on site?
Many agencies offer next-day scheduling.
Do they test materials too?
Most agencies run a materials lab for concrete, soils and steel.
Which special inspection agencies will contact me?
Up to three independent special inspection agencies 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.