City of Ontario Building Department
AI-researched from the official website · pending reviewer verification- Address
- City Hall, 303 East B Street, Ontario, CA 91764
- Phone
- (909) 395-2023
- Hours
- Monday-Thursday 7:30 AM-5:30 PM; Friday 8:00 AM-5:00 PM. Building Counter closed for staff meetings every Tuesday 7:30-9:00 AM and the first Thursday of every month 8:00-10:00 AM.
- Jurisdiction
- City in San Bernardino County · Inland Empire CA metro
Researched October 13, 2026 from the office's official website. Offices change hours and fees; confirm before you visit. See an error? Report it.
Permit types issued
- Building Permit
- Electrical Permit
- Mechanical Permit
- Plumbing Permit
- Residential Reroof Permit
Fees, review times and which of these your project needs are in the .