Looking for a foundation repair contractor in Ontario, CA? Describe your project once and up to three foundation repair contractors 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. Soil movement, drainage and the age of the housing stock decide how often local homes need foundation 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
- License and permit: in California, check the contractor's license and whether the repair needs a permit.
- Independent opinion: for significant movement, an engineer who does not sell the repair can review the plan.
- Warranty: ask whether it is transferable and what it covers.
- Price drivers: number of piers, foundation type, access and drainage corrections.
Useful official resources
-
NCEES: state licensing boards
Find your state board to check an engineer's license.
-
ASCE
The professional society of civil and structural engineers.
Services available in Ontario
-
Foundation piering and leveling
Stabilizing and lifting a settling foundation with steel or concrete piers.
-
Basement wall repair
Repair of bowing or cracked basement walls with anchors, braces or carbon fiber.
-
Foundation inspection
Independent inspection by an engineer before choosing a repair contractor.
Frequently asked questions in Ontario
How much does foundation repair cost in Ontario, CA?
It depends on the cause, the method and the number of piers or anchors. Describe your problem: contractors who serve Ontario reply with a quote.
How long does a repair take?
Many residential piering jobs take a few days; larger repairs take longer.
Will the cracks close after the repair?
Some do when the house is lifted, others need cosmetic repair. Ask what the contractor expects.
Which foundation repair contractors will contact me?
Up to three independent foundation repair contractors 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.