Across 899 building permits issued in Thunder Bay, ON over the trailing 12 months, the typical permit took a median of 10 days from application to issuance, with an average of 29.2 days. The average runs higher than the median because a minority of large or complex projects pull the mean upward, which is exactly why the median is the number to plan around.
Thunder Bay permit activity at a glance
| Metric | Value |
|---|---|
| Median days to issuance | 10 days |
| Average days to issuance | 29.2 days |
| Permits issued (last 12 months) | 899 |
| Average permits per month | 75 |
| Average project value | $366K |
| Total declared project value | $304.7M |
| Cross-city median (6 timing cities) | 28 days |
How Thunder Bay compares
The median across the 6 cities in our dataset that publish processing-time data is 28 days. Thunder Bay sits 18 days faster than that benchmark. A wait time below it means permits here generally move faster; above it means the opposite. Either way, the spread between fast and slow categories within a single city is usually wider than the gap between cities, so the by-work-type table below matters more than any single headline number.
Permit activity by type of work in Thunder Bay
Not all permits move at the same speed. Simple alterations clear far faster than new-building applications. Here is how the most common work types in Thunder Bay broke down over the last 12 months:
| Type of work | Permits | Median days | Avg days |
|---|---|---|---|
| Plumbing System Only - Single Detached Dwelling | 319 | 3 | 5.3 |
| Addition/Alteration - Single Detached Dwelling | 83 | 14 | 27.5 |
| New - Detached Garage | 54 | 16 | 29.8 |
| New - Single Detached Dwelling | 35 | 29 | 79.8 |
| Demolition - Detached Garage | 28 | 2 | 4.7 |
| Addition/Alteration - Duplex | 24 | 32 | 61.6 |
| Addition/Alteration - Commercial Mall | 23 | 60 | 59.8 |
| Demolition - Single Detached Dwelling | 18 | 9 | 12.1 |
| New - Outdoor Recreation Accessory Bldg. | 11 | 15 | 57.2 |
| New - Duplex | 10 | 24 | 35.6 |
| New - Apartment < = 3 Storey - Rental | 10 | 51 | 64.1 |
| New - Semi-Detached Dwelling | 10 | 17 | 17.8 |
Permit volume trend
Thunder Bay issued 899 permits over the trailing 12 months , representing $304.7M in total declared project value. The busiest single month was Oct 2025 (112 permits). Volume drives wait times: months with a surge in applications tend to push processing times up as review staff work through the backlog.
What drives building permit wait times
Permit processing time is rarely about a single step. The biggest levers are:
- Application completeness. Missing drawings, unsigned forms, or a site plan that doesn't match the zoning trigger a resubmission cycle, each round can add weeks.
- Type of work. A like-for-like alteration is reviewed against fewer regulations than a new building, which needs zoning, building, and often servicing sign-offs.
- Project value and complexity. Higher-value projects attract more reviewers and more conditions, which is why the average always exceeds the median.
- Seasonal volume. Application spikes in spring and summer lengthen the queue.
How to read these benchmarks
These are permit-volume and application-to-issuance timing benchmarks, they measure how long permits that were issued took to get there. They are not approval rates: the underlying dataset has no approval-versus-denial field, so we never report rejection percentages. Use the median as your realistic planning number, the average as your worst-case buffer, and the by-work-type table to set expectations for your specific project. The single best way to stay on the fast end is to submit a complete, compliant application the first time.