Do You Need a Survey Before Building a Deck, Shed, or Addition in Ontario?
You’re finally building that deck, adding a bigger shed, or putting on a family room. Then the municipality asks for a survey before they’ll issue a permit and you’re wondering why a backyard project needs paperwork that costs hundreds of dollars.
Here’s what actually decides whether you need one.
Why It’s Required
Every property has setback rules how close a structure can sit to the property line, other buildings, or utility easements. The municipality can’t confirm those distances from a fence or a hedge; they need an accurate boundary survey showing your real property lines, existing structures, and any easements on the lot.
When You Probably Need One
- Additions or second-storey builds : almost always required
- Decks attached to the house : often treated like an addition
- Larger sheds or detached garages : especially near a lot line or over your municipality’s exemption size
- Fences over a certain height :see our guide on when you need a survey before building a fence
- Pools, or anything near a ravine or conservation boundary
- Any time you’re not 100% sure where your property line is : cheaper to confirm now than dispute later
When You Might Not Need One
Small, freestanding sheds well inside the lot, away from any boundary, are often exempt. But “small” and “well away” are defined differently in every municipality check your local zoning bylaw before assuming you’re in the clear.
Already Have an Old Survey?
It might still work if it’s recent and nothing on the property has changed. Worth digging up before ordering a new one our post on finding an existing survey for your property walks through where to look. If you need a fresh one, a Real Property Report is usually the document your municipality will ask for. For projects that also involve regrading or drainage changes, a topographic survey may be required alongside it.
What Happens If You Skip It
- Permit gets refused after you’ve already bought materials
- Stop-work order if you built too close to the line
- Neighbour disputes down the road now with removal costs on top
- Boundary problems that resurface when you sell see do you need a survey to sell your house
None of these are cheaper than getting it done up front. And if you’re weighing options for how the survey itself gets done, it’s worth knowing that 3D laser scanning is now an alternative to a traditional survey for some projects — faster and often more detailed.
Planning a project that might need a survey?
AKM Surveys works across the GTA and can tell you exactly what your municipality requires before you’re mid-permit. Get a current survey or Real Property Report done right the first time.
Request a Free Quote or call 647-914-3361.