Ontario building permit report
75 building permits were issued in Ontario, California over the last 12 months — including 12 reroofs, 5 remodels and additions, and 3 ADUs. Sourced from Ontario's official permit portal.
Last updated September 16, 2026.
Month by month
| Month | All permits | Reroofs | Remodels & additions | ADUs | Pools & spas |
|---|---|---|---|---|---|
| Sep 2026 | 3 | 0 | 0 | 0 | 0 |
| Aug 2026 | 6 | 1 | 0 | 0 | 0 |
| Jul 2026 | 3 | 0 | 0 | 0 | 0 |
| Jun 2026 | 12 | 1 | 2 | 0 | 0 |
| May 2026 | 3 | 0 | 0 | 0 | 0 |
| Apr 2026 | 9 | 4 | 0 | 0 | 0 |
| Mar 2026 | 6 | 1 | 1 | 0 | 0 |
| Feb 2026 | 8 | 1 | 1 | 1 | 0 |
| Jan 2026 | 2 | 0 | 0 | 0 | 0 |
| Dec 2025 | 3 | 1 | 0 | 0 | 0 |
| Nov 2025 | 11 | 1 | 0 | 1 | 0 |
| Oct 2025 | 9 | 2 | 1 | 1 | 0 |
By work type
| Work type | Permits (12 mo) |
|---|---|
| Reroofs | 12 |
| Remodels & additions | 5 |
| ADUs | 3 |
| Pools & spas | 0 |
| Water heaters | 4 |
| Repipes | 0 |
| New construction | 1 |
Common questions about Ontario permits
How many homes in Ontario replaced their roof this year?
12 reroof permits were issued in Ontario in the last 12 months. Each one is a home whose roof — a major factor in what a homeowners policy costs and whether a carrier will write it at all — was replaced on a specific, documented date.
How many ADUs were permitted in Ontario?
3 accessory dwelling unit permits were issued over the last 12 months.
Are these numbers official?
They're compiled directly from Ontario's own permit system — the same public records the city publishes — normalized and categorized by work type, refreshed nightly.
Other California cities
Work these permits. OneForm turns any of these lists into print-ready postcards with per-address QR tracking, under your own name and license number — so you know which addresses responded.
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