What REALLY Happens If You Build Without a Permit?

Everyone knows you’re supposed to get a building permit when you build a home, but what REALLY happens if you don’t?

The short answer is that a number of things happen, and none of them are good.

So let’s say you’re doing an addition on the side of your house, that contains a mudroom, bathroom and kitchen extension.  There’s a miscommunication, your builder is supposed to pull a permit, they think you’re doing it, and work starts.  All of a sudden, there’s a knock at the door, and it’s someone you don’t recognize, it’s a building official, and they ask a whole lot of questions.  Now you realize, there’s no permit pulled, so what happens next?

1. Stop-work order The first thing that usually happens is a stop-work order posted on the property. All construction must halt immediately — sometimes even work unrelated to the unpermitted portion. Ignoring a stop-work order dramatically escalates the consequences.

2. Fines and penalties - Most Canadian municipalities and US jurisdictions impose fines that are often calculated as a multiple of what the original permit fee would have been — commonly 2x to 5x the permit cost, sometimes more for repeat offenders or egregious cases. In some jurisdictions fines can reach tens of thousands of dollars for large unpermitted structures.

3. Retroactive permit application The owner is typically required to apply for a permit after the fact — called a retroactive or "as-built" permit. This sounds straightforward but is often painful because:

• Inspectors need to verify the work meets current code

• Walls, ceilings, or floors may need to be opened up to expose framing, electrical, or plumbing for inspection

• If the work doesn't meet code, it must be brought up to standard before the permit closes — at the owner's cost

4. Demolition order (worst case) If the unpermitted work cannot be brought up to code, or the owner refuses to comply, the municipality can order the work demolished and removed entirely. This is relatively rare but does happen — particularly with unpermitted structures like additions, secondary suites, or detached buildings.

5. Property title issues Unpermitted work can cloud your property title. When you go to sell, a home inspection or title search will often surface it, and you may be required to resolve it before closing — or price it into the sale. Lenders and insurers are also increasingly alert to unpermitted work.

6. Insurance implications If something goes wrong — a fire, a flood, a structural failure — in an area of unpermitted work, your insurer can deny the claim on the basis that the work was not inspected and approved. This is one of the most financially devastating consequences and one of the least understood by homeowners.

The honest reality

The severity varies significantly by jurisdiction and by how the unpermitted work was discovered. A small unpermitted deck in a rural municipality is treated very differently than an unpermitted secondary suite in Vancouver or Toronto. Discovery method matters too — a complaint from a neighbour tends to trigger more aggressive enforcement than something flagged during a routine inspection of permitted work nearby.

Hope this helps, as always, I recommend getting a permit and have a building official check the work to ensure that your project is safe.

Thanks for reading…

Aaron