Survey for a Building Permit in Ontario: Do You Actually Need One?
You’ve picked the design, talked to a contractor, maybe even bought the lumber. Then the permit office asks for a survey, and the project stops until you have one.
It happens a lot, and it’s avoidable. Here’s when a survey for a building permit in Ontario is usually required, what it needs to show, and how to order it without losing weeks.
Why the permit office wants a survey
A permit application has to show where the new structure goes on your lot. More specifically, how far it sits from the property lines and from the buildings already there. Municipalities have setback rules, and they can’t check them against a rough sketch.
If the drawing is based on a guess and the build ends up too close to the line, you’ll find out at review, at inspection, or after the work is done. The last one is the expensive one.
Which projects usually need a survey?
It depends on your city and the size of the project, so ask your building department before you spend money. As a general rule, a current survey is commonly requested for:
- additions that extend your home’s footprint
- detached garages and other accessory buildings
- larger or raised decks
- in-ground pools
- new builds and major rebuilds
Small jobs sometimes get a lighter requirement. But the municipality decides that, not your contractor, so it’s worth a phone call.
What the survey needs to show
For permit purposes, you want it to confirm:
- your lot lines and dimensions
- where the existing house and any other structures sit
- the setbacks from the front, side and rear lot lines
- any easements that might limit where you can build
If your surveyor knows what you’re planning, they can make sure the plan shows what your designer and the permit office will look for.
Can you reuse the survey from when you bought the house?
Maybe. If the lot hasn’t changed, an older survey can still be a useful reference. But the moment you’ve added a deck, a shed or an extension since then, it’s out of date, and a permit office may not accept it. If you can’t find yours at all, our guide on finding an existing survey shows where to look first.
Builder packages for bigger projects
On larger jobs, owners and builders often get a survey-based package put together for the permit application. What goes in it varies by municipality, so describe the project and ask what your city needs. That’s what our builder packages are for.
How to avoid permit delays
- Call your municipality first. Find out exactly which documents they want.
- Order the survey early. Fieldwork and drafting take time, and the permit clock doesn’t start until you have it. If you’re budgeting, this breakdown of survey costs in Ontario helps.
- Tell the surveyor what you’re building. A deck and a two-storey addition need different things from the same survey.
- Keep a copy. You’ll want it again when you sell or renovate.
Quick answers
Do I need a survey to build a deck in Ontario?
Sometimes. Size, height and your city’s rules all matter. Your building department can tell you in one call.
Who orders the survey, me or my contractor?
Either can. Just make sure it meets what your municipality asks for, and get your own copy.
Is a title insurance policy enough instead of a survey?
No. Title insurance isn’t a drawing of your lot, so it can’t show setbacks for a permit application.
Not sure what your project needs? Get in touch with AKM Surveys or call 647-914-3361, and we’ll point you in the right direction.